Question 2956
{"accessible":false,"alternatives":[{"id":14394,"text":"T1"},{"id":14395,"text":"T2"},{"id":14396,"text":"T2*"},{"id":14397,"text":"proton density"}],"archived":false,"correctAlternativeId":14394,"explanation":"\u003cp\u003eA short TE reduces T2 contrast contribution. Short TR and a large flip angle prevent full recovery of longitudinal magnetization - especially in tissues with long T1 relaxation times. This brings out T1 contrast differences in the image.\u003c/p\u003e\u003cp\u003eIn gradient echo sequences, T2/T2* weighting requires long TE, long TR and very small flip angles. Proton density requires short TE, long TR and small flip angles.\u003c/p\u003e","id":2956,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2958","nextQuestionPath":"/articles/t2-weighted-image/questions/2954","relatedArticles":[{"id":45465,"title":"Flip angle","link":"/articles/flip-angle?lang=us"},{"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":18339,"title":"Gradient echo sequences","link":"/articles/gradient-echo-sequences-1?lang=us"},{"id":22558,"title":"MRI physics","link":"/articles/mri-physics?lang=us"},{"id":60744,"title":"Proton density weighted spin-echo images","link":"/articles/proton-density-weighted-spin-echo-images-1?lang=us"}],"alsoUsedIn":[{"id":1927,"kind":"Course","title":"Imaging Physics: MRI - page 1927","link":"https://radiopaedia.org/courses/imaging-physics-mri/pages/1927"}],"stem":"\u003cp\u003eA gradient echo pulse sequence with a short TE, short TR and a large flip angle will have predominantly which weighting?\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/2956"}],"attemptsPercentages":[{"alternativeId":"14394","percentage":69},{"alternativeId":"14397","percentage":14},{"alternativeId":"14396","percentage":11},{"alternativeId":"14395","percentage":5}],"promptToLogin":false,"questionManager":false,"articleId":"t2-weighted-image"}