Question 2939
{"accessible":false,"alternatives":[{"id":14316,"text":"loss of 37% of the longitudinal magnetization vector"},{"id":14317,"text":"loss of 37% of the transverse magnetization vector"},{"id":14318,"text":"loss of 63% of the transverse magnetization vector"},{"id":14319,"text":"recovery of 63% of the longitudinal magnetization vector"}],"archived":false,"correctAlternativeId":14318,"explanation":"\u003cp\u003eT2 is a time constant specific to each tissue. It represents the time taken for the transverse magnetization vector to lose 63% of it's original magnitude. This can also be stated as the time taken to reach 37% of it's original magnitude.\u003c/p\u003e\u003cp\u003eThe T1 time constant represents the time taken for recovery of 63% of the longitudinal magnetization vector in a specific tissue.\u003c/p\u003e","id":2939,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2940","nextQuestionPath":null,"relatedArticles":[{"id":5852,"title":"T1 weighted image","link":"/articles/t1-weighted-image?lang=us"},{"id":16493,"title":"Free induction decay","link":"/articles/free-induction-decay?lang=us"},{"id":6345,"title":"T2 weighted image","link":"/articles/t2-weighted-image?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\u003eWhat does the T2 time constant represent?\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/2939"}],"attemptsPercentages":[{"alternativeId":"14318","percentage":76},{"alternativeId":"14317","percentage":17},{"alternativeId":"14316","percentage":1},{"alternativeId":"14319","percentage":5}],"promptToLogin":false,"questionManager":false,"articleId":"longitudinal-and-transverse-magnetization"}