Question 498
{"accessible":false,"alternatives":[{"id":2495,"text":"short TR, short TE "},{"id":2496,"text":"short TR, long TE \r\n"},{"id":2497,"text":"long TR, short TE \r\n"},{"id":2498,"text":"long TR, long TE \r\n"}],"archived":false,"correctAlternativeId":2495,"explanation":"\u003cp\u003eIf T1 weighted spin echos did not have short TRs, then all the protons would recover their alignment with the main magnetic field and the image would be uniformly intense. Selecting a TR shorter than the\u0026nbsp;tissues' recovery time allows one to differentiate them (i.e. tissue contrast).\u003c/p\u003e","id":498,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2958","nextQuestionPath":"/articles/t1-weighted-image/questions/497","relatedArticles":[],"alsoUsedIn":[],"stem":"\u003cp\u003eThe most appropriate parameter for a T1 weighted spin echo is...\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/498"}],"attemptsPercentages":[{"alternativeId":"2496","percentage":5},{"alternativeId":"2497","percentage":4},{"alternativeId":"2498","percentage":2},{"alternativeId":"2495","percentage":89}],"promptToLogin":false,"questionManager":false,"articleId":"t1-weighted-image"}