Question 2941
{"accessible":false,"alternatives":[{"id":14325,"text":"local magnetic field non-uniformity"},{"id":14326,"text":"patient motion"},{"id":14327,"text":"spin-lattice interactions"},{"id":14328,"text":"spin-spin interactions"},{"id":14329,"text":"turbulent blood flow"}],"archived":false,"correctAlternativeId":14327,"explanation":"\u003cp\u003eLongitudinal recovery (T1 relaxation) occurs primarily due to spin-lattice interactions. This in when spins interact with the non-spin components of the tissue.\u003c/p\u003e\u003cp\u003eT2/T2* relaxation is due to spin-spin interactions and dephasing secondary to local magnetic field inhomogeneities.\u003c/p\u003e\u003cp\u003eTurbulent blood flow results in rapid loss of transverse signal. Patient motion does not affect T1 in any significant/measurable way.\u003c/p\u003e","id":2941,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2942","nextQuestionPath":"/articles/t2-relaxation/questions/2934","relatedArticles":[{"id":6315,"title":"T1 relaxation time","link":"/articles/t1-relaxation-time?lang=us"},{"id":16493,"title":"Free induction decay","link":"/articles/free-induction-decay?lang=us"},{"id":22554,"title":"Relaxation","link":"/articles/relaxation?lang=us"},{"id":16495,"title":"T2* relaxation","link":"/articles/t2-relaxation-1?lang=us"},{"id":178369,"title":"Spin (physics)","link":"/articles/spin-physics?lang=us"}],"alsoUsedIn":[{"id":1926,"kind":"Course","title":"Imaging Physics: MRI - page 1926","link":"https://radiopaedia.org/courses/imaging-physics-mri/pages/1926"}],"stem":"\u003cp\u003eWhich of the following is the primary mechanism for T1 relaxation (longitudinal recovery)?\u003c/p\u003e","menuLinks":[{"text":"Report problem with question","url":"https://docs.google.com/forms/d/e/1FAIpQLSfO3soWYhOjJ7yErSysyCe5V4A1CqW7WK3rDA7MtAkecMGqNw/viewform?entry.1624461248\u0026entry.553583435=https://radiopaedia.org/questions/2941"}],"attemptsPercentages":[{"alternativeId":"14326","percentage":1},{"alternativeId":"14325","percentage":3},{"alternativeId":"14328","percentage":6},{"alternativeId":"14329","percentage":1},{"alternativeId":"14327","percentage":89}],"promptToLogin":false,"questionManager":false,"articleId":"t2-relaxation"}