{"id":606,"date":"2024-01-20T16:35:33","date_gmt":"2024-01-20T16:35:33","guid":{"rendered":"https:\/\/medreasons.com\/?page_id=606"},"modified":"2024-03-13T04:08:31","modified_gmt":"2024-03-13T04:08:31","slug":"how-does-mri-work","status":"publish","type":"page","link":"https:\/\/medreasons.com\/index.php\/posts\/radiology\/how-does-mri-work\/","title":{"rendered":"MRI Physics"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"606\" class=\"elementor elementor-606\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-175c2e94 e-flex e-con-boxed e-con e-parent\" data-id=\"175c2e94\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-700a20e elementor-widget elementor-widget-text-editor\" data-id=\"700a20e\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h1>How does MRI work ?<\/h1>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-48a340fe elementor-widget elementor-widget-text-editor\" data-id=\"48a340fe\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Magnetic Resonance Imaging (MRI) also called as Nuclear Magnetic Resonance Imaging (NMRI) or Magnetic Resonance Tomography (MRT) is an imaging technique which uses magnetic field to generate images of the body. MRI can be easily conceptualised once the Physics and Chemistry behind it is understood. So let\u2019s begin !<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4ff3adc elementor-widget elementor-widget-text-editor\" data-id=\"4ff3adc\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2>MRI &#8211; Physics<\/h2>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e87965c elementor-widget elementor-widget-text-editor\" data-id=\"e87965c\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>We all have read a chapter called Magnetism in our +2s. Our body is made up of elements which are ultimately made up of atoms. <span style=\"font-size: 16px;\">Now an atom has a nucleus containing positively charged proton and neutron with no charge. <\/span>The nucleus is surrounded by negatively charged electrons. The positive charges are continuously moving inside the nucleus i.e. they have an angular momentum. This angular motion is called spin of the particle (electron, proton or neutron)<\/p><p>As a dictum we know that &#8220;every moving charge creates a magnetic field.&#8221;<\/p><p><span style=\"text-decoration: underline;\"><strong>Hydrogen Atom :<\/strong><\/span>\u00a0 The human body is composed of 70% water. MRI relies on the properties of H atom to produce images. Single proton in H atom produces a magnetic field (called as magnetic moment or dipole moment) being a spinning charged particle. Normally the protons are oriented randomly, hence there is no overall magnetic field (They mutually cancel out)<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b2a1177 e-transform elementor-widget elementor-widget-image\" data-id=\"b2a1177\" data-element_type=\"widget\" data-settings=\"{&quot;_transform_rotateZ_effect_hover&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:-360,&quot;sizes&quot;:[]},&quot;_transform_rotateZ_effect_hover_tablet&quot;:{&quot;unit&quot;:&quot;deg&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;_transform_rotateZ_effect_hover_mobile&quot;:{&quot;unit&quot;:&quot;deg&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]}}\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"267\" height=\"300\" src=\"https:\/\/medreasons.com\/wp-content\/uploads\/2024\/01\/plus-1-267x300.png\" class=\"elementor-animation-grow-rotate attachment-medium size-medium wp-image-756\" alt=\"Proton - MRI\" srcset=\"https:\/\/medreasons.com\/wp-content\/uploads\/2024\/01\/plus-1-267x300.png 267w, https:\/\/medreasons.com\/wp-content\/uploads\/2024\/01\/plus-1-e1705869021112.png 337w\" sizes=\"(max-width: 267px) 100vw, 267px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3a1681b elementor-widget elementor-widget-text-editor\" data-id=\"3a1681b\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2>Why electron of H atom is not used for MRI ?<\/h2>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-41d0c97 elementor-widget elementor-widget-text-editor\" data-id=\"41d0c97\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p style=\"text-align: left;\">One might wonder that a H atom has two charged particles &#8211; electron and a proton, both possess a magnetic field, so why we specifically use magnetic field of proton for MRI.<\/p><p style=\"text-align: left;\">The magnetic dipole moment is dependent on the mass and charge of an elementary particle. Electron is not affected by magnetic field produced by MRI because the dipole moment of electron is far greater than a proton (X 658 times stronger) due to greater mass of proton (X 1836 times).<\/p><p style=\"text-align: left;\">This means that normally Electromagnetic waves (radio waves) can penetrate tissues normally to excite H nuclei, but to excite the electronic magnetic moment the energy required is 658 times more becoming this way of microwave in EM spectrum.<\/p><p style=\"text-align: left;\">But microwaves can penetrate only small centimetres of tissue making it unsuitable for study due to high energy deposit on surface.<\/p><p style=\"text-align: left;\">Hence due to this reason we don\u2019t use electron of H atom in MRI and rather use proton for the purpose of imaging.\u00a0<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8b4499a elementor-widget-divider--separator-type-pattern elementor-widget-divider--no-spacing elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"8b4499a\" data-element_type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\" style=\"--divider-pattern-url: url(&quot;data:image\/svg+xml,%3Csvg xmlns=&#039;http:\/\/www.w3.org\/2000\/svg&#039; preserveAspectRatio=&#039;xMidYMid meet&#039; overflow=&#039;visible&#039; height=&#039;100%&#039; viewBox=&#039;0 0 126 26&#039; fill=&#039;black&#039; stroke=&#039;none&#039;%3E%3Cpath d=&#039;M10.7,6l2.5,2.6l-4,4.3l4,5.4l-2.5,1.9l-4.5-5.2l-3.9,4.2L0.7,17L4,13.1L0,8.6l2.3-1.3l3.9,3.9L10.7,6z M23.9,6.6l4.2,4.5L32,7.2l2.3,1.3l-4,4.5l3.2,3.9L32,19.1l-3.9-3.3l-4.5,4.3l-2.5-1.9l4.4-5.1l-4.2-3.9L23.9,6.6zM73.5,6L76,8.6l-4,4.3l4,5.4l-2.5,1.9l-4.5-5.2l-3.9,4.2L63.5,17l4.1-4.7L63.5,8l2.3-1.3l4.1,3.6L73.5,6z M94,6l2.5,2.6l-4,4.3l4,5.4L94,20.1l-3.9-5l-3.9,4.2L84,17l3.2-3.9L84,8.6l2.3-1.3l3.2,3.9L94,6z M106.9,6l4.5,5.1l3.9-3.9l2.3,1.3l-4,4.5l3.2,3.9l-1.6,2.1l-3.9-4.2l-4.5,5.2l-2.5-1.9l4-5.4l-4-4.3L106.9,6z M53.1,6l2.5,2.6l-4,4.3l4,4.6l-2.5,1.9l-4.5-4.5l-3.5,4.5L43.1,17l3.2-3.9l-4-4.5l2.3-1.3l3.9,3.9L53.1,6z&#039;\/%3E%3C\/svg%3E&quot;);\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a3c7b0f elementor-widget elementor-widget-text-editor\" data-id=\"a3c7b0f\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2>Components of MRI Machine<\/h2>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ce150fc elementor-widget elementor-widget-text-editor\" data-id=\"ce150fc\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p style=\"text-align: left;\">Now let\u2019s have a look at what is inside a MRI machine.\u00a0<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e9e484c elementor-widget elementor-widget-image\" data-id=\"e9e484c\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"768\" height=\"416\" src=\"https:\/\/medreasons.com\/wp-content\/uploads\/2024\/01\/MRI-Components-1-768x416.png\" class=\"attachment-medium_large size-medium_large wp-image-730\" alt=\"Components of MRI machine\" srcset=\"https:\/\/medreasons.com\/wp-content\/uploads\/2024\/01\/MRI-Components-1-768x416.png 768w, https:\/\/medreasons.com\/wp-content\/uploads\/2024\/01\/MRI-Components-1-300x163.png 300w, https:\/\/medreasons.com\/wp-content\/uploads\/2024\/01\/MRI-Components-1-1024x555.png 1024w, https:\/\/medreasons.com\/wp-content\/uploads\/2024\/01\/MRI-Components-1.png 1279w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-4d9d4fa e-flex e-con-boxed e-con e-parent\" data-id=\"4d9d4fa\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-645ae77 elementor-widget elementor-widget-text-editor\" data-id=\"645ae77\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul><li><strong>Primary Magnetic Field :<\/strong> This magnetic field is produced by a superconducting magnet of 1.5 &#8211; 3 Tesla strength.<\/li><li><strong>Gradient Coil :\u00a0<\/strong>It is used to produce a variation (gradient) in the magnetic field in X , Y and Z axes.\u00a0<\/li><li><strong>Radiofrequency (RF) Coils :\u00a0<\/strong>These are simply loops of wire that transmit the RF signal and also receive the return signal from the body of patient.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-7eb18c4 e-flex e-con-boxed e-con e-parent\" data-id=\"7eb18c4\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-8443c75 elementor-widget-divider--separator-type-pattern elementor-widget-divider--no-spacing elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"8443c75\" data-element_type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\" style=\"--divider-pattern-url: url(&quot;data:image\/svg+xml,%3Csvg xmlns=&#039;http:\/\/www.w3.org\/2000\/svg&#039; preserveAspectRatio=&#039;xMidYMid meet&#039; overflow=&#039;visible&#039; height=&#039;100%&#039; viewBox=&#039;0 0 126 26&#039; fill=&#039;black&#039; stroke=&#039;none&#039;%3E%3Cpath d=&#039;M10.7,6l2.5,2.6l-4,4.3l4,5.4l-2.5,1.9l-4.5-5.2l-3.9,4.2L0.7,17L4,13.1L0,8.6l2.3-1.3l3.9,3.9L10.7,6z M23.9,6.6l4.2,4.5L32,7.2l2.3,1.3l-4,4.5l3.2,3.9L32,19.1l-3.9-3.3l-4.5,4.3l-2.5-1.9l4.4-5.1l-4.2-3.9L23.9,6.6zM73.5,6L76,8.6l-4,4.3l4,5.4l-2.5,1.9l-4.5-5.2l-3.9,4.2L63.5,17l4.1-4.7L63.5,8l2.3-1.3l4.1,3.6L73.5,6z M94,6l2.5,2.6l-4,4.3l4,5.4L94,20.1l-3.9-5l-3.9,4.2L84,17l3.2-3.9L84,8.6l2.3-1.3l3.2,3.9L94,6z M106.9,6l4.5,5.1l3.9-3.9l2.3,1.3l-4,4.5l3.2,3.9l-1.6,2.1l-3.9-4.2l-4.5,5.2l-2.5-1.9l4-5.4l-4-4.3L106.9,6z M53.1,6l2.5,2.6l-4,4.3l4,4.6l-2.5,1.9l-4.5-4.5l-3.5,4.5L43.1,17l3.2-3.9l-4-4.5l2.3-1.3l3.9,3.9L53.1,6z&#039;\/%3E%3C\/svg%3E&quot;);\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c2c014d elementor-widget elementor-widget-text-editor\" data-id=\"c2c014d\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Once a primary magnetic field (B<sub>0<\/sub>) is applied the H atoms align parallel or antiparallel to the direction of application of magnetic field. This process is called Longitudinal Magnetisation.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-cba70f0 e-flex e-con-boxed e-con e-parent\" data-id=\"cba70f0\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-4120e26 e-con-full e-flex e-con e-child\" data-id=\"4120e26\" data-element_type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-34477fe elementor-widget elementor-widget-image\" data-id=\"34477fe\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"768\" height=\"416\" src=\"https:\/\/medreasons.com\/wp-content\/uploads\/2024\/01\/No-applied-magnetic-field-768x416.png\" class=\"attachment-medium_large size-medium_large wp-image-781\" alt=\"random alignments of H atom - MRI\" srcset=\"https:\/\/medreasons.com\/wp-content\/uploads\/2024\/01\/No-applied-magnetic-field-768x416.png 768w, https:\/\/medreasons.com\/wp-content\/uploads\/2024\/01\/No-applied-magnetic-field-300x163.png 300w, https:\/\/medreasons.com\/wp-content\/uploads\/2024\/01\/No-applied-magnetic-field-1024x555.png 1024w, https:\/\/medreasons.com\/wp-content\/uploads\/2024\/01\/No-applied-magnetic-field.png 1284w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-4fa7758 e-con-full e-flex e-con e-child\" data-id=\"4fa7758\" data-element_type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-fea2d9f elementor-widget elementor-widget-image\" data-id=\"fea2d9f\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"555\" src=\"https:\/\/medreasons.com\/wp-content\/uploads\/2024\/01\/applied-magnetic-field-3-1024x555.png\" class=\"attachment-large size-large wp-image-883\" alt=\"Applied magnetic field - MRI\" srcset=\"https:\/\/medreasons.com\/wp-content\/uploads\/2024\/01\/applied-magnetic-field-3-1024x555.png 1024w, https:\/\/medreasons.com\/wp-content\/uploads\/2024\/01\/applied-magnetic-field-3-300x162.png 300w, https:\/\/medreasons.com\/wp-content\/uploads\/2024\/01\/applied-magnetic-field-3-768x416.png 768w, https:\/\/medreasons.com\/wp-content\/uploads\/2024\/01\/applied-magnetic-field-3.png 1285w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-a1f7583 e-flex e-con-boxed e-con e-parent\" data-id=\"a1f7583\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a85721d elementor-widget elementor-widget-text-editor\" data-id=\"a85721d\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"\">It should be noted that a greater proportion aligns parallel (low energy state) than antiparallel (higher energy state) to the primary magnetic field B<\/span><sub>0<\/sub><span style=\"\">.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9627e69 elementor-widget-divider--separator-type-pattern elementor-widget-divider--no-spacing elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"9627e69\" data-element_type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\" style=\"--divider-pattern-url: url(&quot;data:image\/svg+xml,%3Csvg xmlns=&#039;http:\/\/www.w3.org\/2000\/svg&#039; preserveAspectRatio=&#039;xMidYMid meet&#039; overflow=&#039;visible&#039; height=&#039;100%&#039; viewBox=&#039;0 0 126 26&#039; fill=&#039;black&#039; stroke=&#039;none&#039;%3E%3Cpath d=&#039;M10.7,6l2.5,2.6l-4,4.3l4,5.4l-2.5,1.9l-4.5-5.2l-3.9,4.2L0.7,17L4,13.1L0,8.6l2.3-1.3l3.9,3.9L10.7,6z M23.9,6.6l4.2,4.5L32,7.2l2.3,1.3l-4,4.5l3.2,3.9L32,19.1l-3.9-3.3l-4.5,4.3l-2.5-1.9l4.4-5.1l-4.2-3.9L23.9,6.6zM73.5,6L76,8.6l-4,4.3l4,5.4l-2.5,1.9l-4.5-5.2l-3.9,4.2L63.5,17l4.1-4.7L63.5,8l2.3-1.3l4.1,3.6L73.5,6z M94,6l2.5,2.6l-4,4.3l4,5.4L94,20.1l-3.9-5l-3.9,4.2L84,17l3.2-3.9L84,8.6l2.3-1.3l3.2,3.9L94,6z M106.9,6l4.5,5.1l3.9-3.9l2.3,1.3l-4,4.5l3.2,3.9l-1.6,2.1l-3.9-4.2l-4.5,5.2l-2.5-1.9l4-5.4l-4-4.3L106.9,6z M53.1,6l2.5,2.6l-4,4.3l4,4.6l-2.5,1.9l-4.5-4.5l-3.5,4.5L43.1,17l3.2-3.9l-4-4.5l2.3-1.3l3.9,3.9L53.1,6z&#039;\/%3E%3C\/svg%3E&quot;);\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7e94d5e elementor-widget elementor-widget-text-editor\" data-id=\"7e94d5e\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2>Precession in MRI<\/h2>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-63da513 elementor-widget elementor-widget-text-editor\" data-id=\"63da513\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"text-decoration: underline;\"><strong>Precession<\/strong><\/span><strong> :<\/strong>Protons spin around the long axis of the primary magnetic field which is called Precession. It can be further understood as the protons rotate inside the nucleus of H atom (spin) and the whole H atom (and thus the protons inside the atom too) rotate along the direction of magnetic field\u00a0 (precession).\u00a0<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-57d6d6c e-flex e-con-boxed e-con e-parent\" data-id=\"57d6d6c\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-196044f elementor-widget elementor-widget-image\" data-id=\"196044f\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"586\" height=\"360\" src=\"https:\/\/medreasons.com\/wp-content\/uploads\/2024\/01\/Precision-4-1.gif\" class=\"attachment-medium_large size-medium_large wp-image-860\" alt=\"precession - MRI\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Precession<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8a1b39e elementor-widget elementor-widget-text-editor\" data-id=\"8a1b39e\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>When protons precess together they are said to spin <strong>In-phase<\/strong> and to the contrary they are called <strong>Out of phase<\/strong> when they precess randomly. Normally at any given time protons precess haphazardly (due to entropy) and become aligned only when an external field is applied upon them. The frequency of In-phase precession when an eternal field is applied on the protons is called <strong>Larmor or precessional frequency <\/strong>after the Irish physicist and mathematician Sir Joseph Larmor.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-14d1911 e-flex e-con-boxed e-con e-parent\" data-id=\"14d1911\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-b65b772 e-con-full e-flex e-con e-child\" data-id=\"b65b772\" data-element_type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a54ed3e elementor-widget elementor-widget-image\" data-id=\"a54ed3e\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"555\" src=\"https:\/\/medreasons.com\/wp-content\/uploads\/2024\/02\/Out-of-phase-1024x555.png\" class=\"attachment-large size-large wp-image-964\" alt=\"Electrons precessing out of phase\" srcset=\"https:\/\/medreasons.com\/wp-content\/uploads\/2024\/02\/Out-of-phase-1024x555.png 1024w, https:\/\/medreasons.com\/wp-content\/uploads\/2024\/02\/Out-of-phase-300x163.png 300w, https:\/\/medreasons.com\/wp-content\/uploads\/2024\/02\/Out-of-phase-768x416.png 768w, https:\/\/medreasons.com\/wp-content\/uploads\/2024\/02\/Out-of-phase.png 1284w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Out of Phase Precession<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-147a076 e-con-full e-flex e-con e-child\" data-id=\"147a076\" data-element_type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-974b202 elementor-widget elementor-widget-image\" data-id=\"974b202\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"555\" src=\"https:\/\/medreasons.com\/wp-content\/uploads\/2024\/02\/In-phase-1024x555.png\" class=\"attachment-large size-large wp-image-965\" alt=\"Electrons precessing in-phase\" srcset=\"https:\/\/medreasons.com\/wp-content\/uploads\/2024\/02\/In-phase-1024x555.png 1024w, https:\/\/medreasons.com\/wp-content\/uploads\/2024\/02\/In-phase-300x163.png 300w, https:\/\/medreasons.com\/wp-content\/uploads\/2024\/02\/In-phase-768x416.png 768w, https:\/\/medreasons.com\/wp-content\/uploads\/2024\/02\/In-phase.png 1284w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">In - Phase Precession<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-dc93583 e-flex e-con-boxed e-con e-parent\" data-id=\"dc93583\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-b913db3 elementor-widget-divider--separator-type-pattern elementor-widget-divider--no-spacing elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"b913db3\" data-element_type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\" style=\"--divider-pattern-url: url(&quot;data:image\/svg+xml,%3Csvg xmlns=&#039;http:\/\/www.w3.org\/2000\/svg&#039; preserveAspectRatio=&#039;xMidYMid meet&#039; overflow=&#039;visible&#039; height=&#039;100%&#039; viewBox=&#039;0 0 126 26&#039; fill=&#039;black&#039; stroke=&#039;none&#039;%3E%3Cpath d=&#039;M10.7,6l2.5,2.6l-4,4.3l4,5.4l-2.5,1.9l-4.5-5.2l-3.9,4.2L0.7,17L4,13.1L0,8.6l2.3-1.3l3.9,3.9L10.7,6z M23.9,6.6l4.2,4.5L32,7.2l2.3,1.3l-4,4.5l3.2,3.9L32,19.1l-3.9-3.3l-4.5,4.3l-2.5-1.9l4.4-5.1l-4.2-3.9L23.9,6.6zM73.5,6L76,8.6l-4,4.3l4,5.4l-2.5,1.9l-4.5-5.2l-3.9,4.2L63.5,17l4.1-4.7L63.5,8l2.3-1.3l4.1,3.6L73.5,6z M94,6l2.5,2.6l-4,4.3l4,5.4L94,20.1l-3.9-5l-3.9,4.2L84,17l3.2-3.9L84,8.6l2.3-1.3l3.2,3.9L94,6z M106.9,6l4.5,5.1l3.9-3.9l2.3,1.3l-4,4.5l3.2,3.9l-1.6,2.1l-3.9-4.2l-4.5,5.2l-2.5-1.9l4-5.4l-4-4.3L106.9,6z M53.1,6l2.5,2.6l-4,4.3l4,4.6l-2.5,1.9l-4.5-4.5l-3.5,4.5L43.1,17l3.2-3.9l-4-4.5l2.3-1.3l3.9,3.9L53.1,6z&#039;\/%3E%3C\/svg%3E&quot;);\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ba4345d elementor-widget elementor-widget-text-editor\" data-id=\"ba4345d\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2>Longitudinal and Transverse Magnetization<\/h2>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-91968eb elementor-widget elementor-widget-text-editor\" data-id=\"91968eb\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Now when the protons are precessing in a particular axis they generate a magnetic field in that corresponding axis. The magnetic field generated by the protons in the Longitudinal axis parallel to axis B<sub>0 <\/sub>\u00a0is called Longitudenal\u00a0 Magnetization\u00a0 and that perpendicular to B<sub>0 <\/sub>\u00a0is called Transverse Magnetization.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5ca12a4 elementor-widget elementor-widget-image\" data-id=\"5ca12a4\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"416\" src=\"https:\/\/medreasons.com\/wp-content\/uploads\/2024\/02\/Longitudinal-and-Transverse-Magnetization-1-768x416.png\" class=\"attachment-medium_large size-medium_large wp-image-993\" alt=\"\" srcset=\"https:\/\/medreasons.com\/wp-content\/uploads\/2024\/02\/Longitudinal-and-Transverse-Magnetization-1-768x416.png 768w, https:\/\/medreasons.com\/wp-content\/uploads\/2024\/02\/Longitudinal-and-Transverse-Magnetization-1-300x163.png 300w, https:\/\/medreasons.com\/wp-content\/uploads\/2024\/02\/Longitudinal-and-Transverse-Magnetization-1-1024x555.png 1024w, https:\/\/medreasons.com\/wp-content\/uploads\/2024\/02\/Longitudinal-and-Transverse-Magnetization-1.png 1284w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-92171c0 elementor-widget-divider--separator-type-pattern elementor-widget-divider--no-spacing elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"92171c0\" data-element_type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\" style=\"--divider-pattern-url: url(&quot;data:image\/svg+xml,%3Csvg xmlns=&#039;http:\/\/www.w3.org\/2000\/svg&#039; preserveAspectRatio=&#039;xMidYMid meet&#039; overflow=&#039;visible&#039; height=&#039;100%&#039; viewBox=&#039;0 0 126 26&#039; fill=&#039;black&#039; stroke=&#039;none&#039;%3E%3Cpath d=&#039;M10.7,6l2.5,2.6l-4,4.3l4,5.4l-2.5,1.9l-4.5-5.2l-3.9,4.2L0.7,17L4,13.1L0,8.6l2.3-1.3l3.9,3.9L10.7,6z M23.9,6.6l4.2,4.5L32,7.2l2.3,1.3l-4,4.5l3.2,3.9L32,19.1l-3.9-3.3l-4.5,4.3l-2.5-1.9l4.4-5.1l-4.2-3.9L23.9,6.6zM73.5,6L76,8.6l-4,4.3l4,5.4l-2.5,1.9l-4.5-5.2l-3.9,4.2L63.5,17l4.1-4.7L63.5,8l2.3-1.3l4.1,3.6L73.5,6z M94,6l2.5,2.6l-4,4.3l4,5.4L94,20.1l-3.9-5l-3.9,4.2L84,17l3.2-3.9L84,8.6l2.3-1.3l3.2,3.9L94,6z M106.9,6l4.5,5.1l3.9-3.9l2.3,1.3l-4,4.5l3.2,3.9l-1.6,2.1l-3.9-4.2l-4.5,5.2l-2.5-1.9l4-5.4l-4-4.3L106.9,6z M53.1,6l2.5,2.6l-4,4.3l4,4.6l-2.5,1.9l-4.5-4.5l-3.5,4.5L43.1,17l3.2-3.9l-4-4.5l2.3-1.3l3.9,3.9L53.1,6z&#039;\/%3E%3C\/svg%3E&quot;);\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6b2ff03 elementor-widget elementor-widget-text-editor\" data-id=\"6b2ff03\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2>Flipping of protons\u00a0\u00a0<\/h2>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5e400df elementor-widget elementor-widget-text-editor\" data-id=\"5e400df\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Now if we switch on the Radiofrequency Coils (RF Coils) for a brief period of time it will apply an external magnetic field which has the same precession frequency as of the protons. This second magnetic field (also called as <span style=\"text-decoration: underline;\"><strong>RF Pulse<\/strong><\/span>) will supply some of its own energy to the already precessing protons. This energy is specifically taken up by the protons precessing at low energy states to jump from the lower energy states to higher energy states (Flipping of protons) thus decreasing their Transverse magnetization and increasing their Longitudinal magnetization.\u00a0<\/p><p>Not only do the protons flip but they also start precessing In-phase under the influence of RF pulse.\u00a0<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-61fc404 e-flex e-con-boxed e-con e-parent\" data-id=\"61fc404\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-06a09b5 elementor-widget-divider--separator-type-pattern elementor-widget-divider--no-spacing elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"06a09b5\" data-element_type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\" style=\"--divider-pattern-url: url(&quot;data:image\/svg+xml,%3Csvg xmlns=&#039;http:\/\/www.w3.org\/2000\/svg&#039; preserveAspectRatio=&#039;xMidYMid meet&#039; overflow=&#039;visible&#039; height=&#039;100%&#039; viewBox=&#039;0 0 126 26&#039; fill=&#039;black&#039; stroke=&#039;none&#039;%3E%3Cpath d=&#039;M10.7,6l2.5,2.6l-4,4.3l4,5.4l-2.5,1.9l-4.5-5.2l-3.9,4.2L0.7,17L4,13.1L0,8.6l2.3-1.3l3.9,3.9L10.7,6z M23.9,6.6l4.2,4.5L32,7.2l2.3,1.3l-4,4.5l3.2,3.9L32,19.1l-3.9-3.3l-4.5,4.3l-2.5-1.9l4.4-5.1l-4.2-3.9L23.9,6.6zM73.5,6L76,8.6l-4,4.3l4,5.4l-2.5,1.9l-4.5-5.2l-3.9,4.2L63.5,17l4.1-4.7L63.5,8l2.3-1.3l4.1,3.6L73.5,6z M94,6l2.5,2.6l-4,4.3l4,5.4L94,20.1l-3.9-5l-3.9,4.2L84,17l3.2-3.9L84,8.6l2.3-1.3l3.2,3.9L94,6z M106.9,6l4.5,5.1l3.9-3.9l2.3,1.3l-4,4.5l3.2,3.9l-1.6,2.1l-3.9-4.2l-4.5,5.2l-2.5-1.9l4-5.4l-4-4.3L106.9,6z M53.1,6l2.5,2.6l-4,4.3l4,4.6l-2.5,1.9l-4.5-4.5l-3.5,4.5L43.1,17l3.2-3.9l-4-4.5l2.3-1.3l3.9,3.9L53.1,6z&#039;\/%3E%3C\/svg%3E&quot;);\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-88967ba elementor-widget elementor-widget-text-editor\" data-id=\"88967ba\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2>Relaxation<\/h2>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5a411ad elementor-widget elementor-widget-text-editor\" data-id=\"5a411ad\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>In the previous section we saw that the RF pulse provided energy to the protons which helped them to flip to higher energy states and as a result there was a growth in Longitudinal magnetization. Now as the protons in the higher energy state are not stable (they encounter steric hindrances) hence they start losing their gained energy. In this process many protons start falling back to the lower energy state which causes a decrease in Longitudinal magnetization and regrowth of Transverse magnetisation.<\/p>\n<p>This whole process by which protons reach back to their equilibrium state is called <strong>Relaxation&nbsp;<\/strong>and the time taken in this process is called <strong>Relaxation time<\/strong>.&nbsp;<\/p>\n<p>There are two processes that happen during the whole relaxation process &#8211;<\/p>\n<ol>\n<li>T1 Relaxation<\/li>\n<li>T2 Relaxation&nbsp;<\/li>\n<\/ol>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-bf434a8 elementor-widget elementor-widget-image\" data-id=\"bf434a8\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"400\" src=\"https:\/\/medreasons.com\/wp-content\/uploads\/2024\/03\/Relaxation-1024x400.png\" class=\"attachment-large size-large wp-image-1010\" alt=\"T1 and T2 Relaxation of Protons\" srcset=\"https:\/\/medreasons.com\/wp-content\/uploads\/2024\/03\/Relaxation-1024x400.png 1024w, https:\/\/medreasons.com\/wp-content\/uploads\/2024\/03\/Relaxation-300x117.png 300w, https:\/\/medreasons.com\/wp-content\/uploads\/2024\/03\/Relaxation-768x300.png 768w, https:\/\/medreasons.com\/wp-content\/uploads\/2024\/03\/Relaxation-1536x601.png 1536w, https:\/\/medreasons.com\/wp-content\/uploads\/2024\/03\/Relaxation-2048x801.png 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-40ebb39 elementor-widget elementor-widget-spacer\" data-id=\"40ebb39\" data-element_type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-aa781b7 elementor-widget elementor-widget-text-editor\" data-id=\"aa781b7\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h3>T1 Relaxation<\/h3>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a4a123f elementor-widget elementor-widget-text-editor\" data-id=\"a4a123f\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>T1 Relaxation happens when protons flip back to their original state by losing some energy. As there is a change in energy states of proton, T1 relaxation is also called as <strong>Spin &#8211; Lattice Relaxation<\/strong>. The &#8216;T1&#8217; stands for the &#8216;Thermal relaxation&#8217;.\u00a0<\/p><p>T1 relaxation majorly depends on the composition of the tissue because steric hindrances affect the loss of energy of protons (we&#8217;ll understand this in detail in T2 weighted MRI section).<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-37281f9 elementor-widget elementor-widget-image\" data-id=\"37281f9\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"600\" src=\"https:\/\/medreasons.com\/wp-content\/uploads\/2024\/03\/Fat-and-Water-T1-relaxation.png\" class=\"attachment-large size-large wp-image-1021\" alt=\"Fat and Water T1 relaxation\" srcset=\"https:\/\/medreasons.com\/wp-content\/uploads\/2024\/03\/Fat-and-Water-T1-relaxation.png 800w, https:\/\/medreasons.com\/wp-content\/uploads\/2024\/03\/Fat-and-Water-T1-relaxation-300x225.png 300w, https:\/\/medreasons.com\/wp-content\/uploads\/2024\/03\/Fat-and-Water-T1-relaxation-768x576.png 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6654368 elementor-widget elementor-widget-spacer\" data-id=\"6654368\" data-element_type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-36ec88c elementor-widget elementor-widget-text-editor\" data-id=\"36ec88c\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h3>T2 Relaxation<\/h3>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-34f3611 elementor-widget elementor-widget-text-editor\" data-id=\"34f3611\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>After RF Pulse the protons that were In-phase begin to dephase out of the larmour frequency in the transverse axis. This relaxation is called T2 or <strong>Spin &#8211; Spin Relaxation<\/strong>.\u00a0<\/p><p>Just like T1 relaxation, T2 relaxation also varies with the composition of the tissue.\u00a0 \u00a0<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6329483 elementor-widget-divider--separator-type-pattern elementor-widget-divider--no-spacing elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"6329483\" data-element_type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\" style=\"--divider-pattern-url: url(&quot;data:image\/svg+xml,%3Csvg xmlns=&#039;http:\/\/www.w3.org\/2000\/svg&#039; preserveAspectRatio=&#039;xMidYMid meet&#039; overflow=&#039;visible&#039; height=&#039;100%&#039; viewBox=&#039;0 0 126 26&#039; fill=&#039;black&#039; stroke=&#039;none&#039;%3E%3Cpath d=&#039;M10.7,6l2.5,2.6l-4,4.3l4,5.4l-2.5,1.9l-4.5-5.2l-3.9,4.2L0.7,17L4,13.1L0,8.6l2.3-1.3l3.9,3.9L10.7,6z M23.9,6.6l4.2,4.5L32,7.2l2.3,1.3l-4,4.5l3.2,3.9L32,19.1l-3.9-3.3l-4.5,4.3l-2.5-1.9l4.4-5.1l-4.2-3.9L23.9,6.6zM73.5,6L76,8.6l-4,4.3l4,5.4l-2.5,1.9l-4.5-5.2l-3.9,4.2L63.5,17l4.1-4.7L63.5,8l2.3-1.3l4.1,3.6L73.5,6z M94,6l2.5,2.6l-4,4.3l4,5.4L94,20.1l-3.9-5l-3.9,4.2L84,17l3.2-3.9L84,8.6l2.3-1.3l3.2,3.9L94,6z M106.9,6l4.5,5.1l3.9-3.9l2.3,1.3l-4,4.5l3.2,3.9l-1.6,2.1l-3.9-4.2l-4.5,5.2l-2.5-1.9l4-5.4l-4-4.3L106.9,6z M53.1,6l2.5,2.6l-4,4.3l4,4.6l-2.5,1.9l-4.5-4.5l-3.5,4.5L43.1,17l3.2-3.9l-4-4.5l2.3-1.3l3.9,3.9L53.1,6z&#039;\/%3E%3C\/svg%3E&quot;);\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-66a56e3 e-flex e-con-boxed e-con e-parent\" data-id=\"66a56e3\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-43b0466 elementor-widget elementor-widget-text-editor\" data-id=\"43b0466\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2>Summary of Processes occurring in MRI\u00a0\u00a0<\/h2>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-57b109f elementor-widget elementor-widget-image\" data-id=\"57b109f\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"411\" src=\"https:\/\/medreasons.com\/wp-content\/uploads\/2024\/03\/Summary-crop-1024x411.png\" class=\"attachment-large size-large wp-image-1036\" alt=\"MRI events\" srcset=\"https:\/\/medreasons.com\/wp-content\/uploads\/2024\/03\/Summary-crop-1024x411.png 1024w, https:\/\/medreasons.com\/wp-content\/uploads\/2024\/03\/Summary-crop-300x120.png 300w, https:\/\/medreasons.com\/wp-content\/uploads\/2024\/03\/Summary-crop-768x308.png 768w, https:\/\/medreasons.com\/wp-content\/uploads\/2024\/03\/Summary-crop-1536x617.png 1536w, https:\/\/medreasons.com\/wp-content\/uploads\/2024\/03\/Summary-crop-2048x822.png 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-271a5ce e-flex e-con-boxed e-con e-parent\" data-id=\"271a5ce\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-0fbc7ac elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"0fbc7ac\" data-element_type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div 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class=\"elementor-screen-only\">Next<\/span><\/span><\/a>\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>How does MRI work ? Magnetic Resonance Imaging (MRI) also called as Nuclear Magnetic Resonance Imaging (NMRI) or Magnetic Resonance Tomography (MRT) is an imaging technique which uses magnetic field to generate images of the body. MRI can be easily conceptualised once the Physics and Chemistry behind it is understood. So let\u2019s begin ! MRI [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":284,"menu_order":1,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"class_list":["post-606","page","type-page","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/medreasons.com\/index.php\/wp-json\/wp\/v2\/pages\/606","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/medreasons.com\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/medreasons.com\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/medreasons.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/medreasons.com\/index.php\/wp-json\/wp\/v2\/comments?post=606"}],"version-history":[{"count":398,"href":"https:\/\/medreasons.com\/index.php\/wp-json\/wp\/v2\/pages\/606\/revisions"}],"predecessor-version":[{"id":1179,"href":"https:\/\/medreasons.com\/index.php\/wp-json\/wp\/v2\/pages\/606\/revisions\/1179"}],"up":[{"embeddable":true,"href":"https:\/\/medreasons.com\/index.php\/wp-json\/wp\/v2\/pages\/284"}],"wp:attachment":[{"href":"https:\/\/medreasons.com\/index.php\/wp-json\/wp\/v2\/media?parent=606"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}