Question 2958
{"accessible":false,"alternatives":[{"id":14402,"text":"long TE, long TR"},{"id":14403,"text":"long TE, short TR"},{"id":14404,"text":"short TE, short TR"},{"id":14405,"text":"short TE, long TR"}],"archived":false,"correctAlternativeId":14403,"explanation":"\u003cp\u003eA long TE, short TR sequence will create a low contrast, low signal, noisy image.\u003c/p\u003e\u003cp\u003eLong TEs sample signal late in the transverse decay curve. Short TRs do not allow for full recovery of the longitudinal magnetisation vector. These, in combination, provide minimal signal.\u003c/p\u003e\u003cp\u003e\u003c/p\u003e\u003cp\u003eLong TE, long TR = T2-weighted\u003c/p\u003e\u003cp\u003eShort TE, short TR = T1-weighted\u003c/p\u003e\u003cp\u003eShort TE, long TR = proton density weighted\u003c/p\u003e","id":2958,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2958","nextQuestionPath":"/articles/t1-weighted-image/questions/2957","relatedArticles":[{"id":6345,"title":"T2 weighted image","link":"/articles/t2-weighted-image?lang=gb"},{"id":22558,"title":"MRI physics","link":"/articles/mri-physics?lang=gb"},{"id":60744,"title":"Proton density weighted spin-echo images","link":"/articles/proton-density-weighted-spin-echo-images-1?lang=gb"}],"alsoUsedIn":[{"id":1927,"kind":"Course","title":"Imaging Physics: MRI - page 1927","link":"https://radiopaedia.org/courses/imaging-physics-mri/pages/1927"}],"stem":"\u003cp\u003eWhich of the following spin echo sequences is seldom performed?\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/2958"}],"attemptsPercentages":[{"alternativeId":"14403","percentage":55},{"alternativeId":"14405","percentage":15},{"alternativeId":"14402","percentage":22},{"alternativeId":"14404","percentage":8}],"promptToLogin":false,"questionManager":false,"articleId":"t1-weighted-image"}