Question 2942
{"accessible":false,"alternatives":[{"id":14330,"text":"TE 10ms; TR 300ms"},{"id":14331,"text":"TE 10ms; TR 1500ms"},{"id":14332,"text":"TE 100ms; TR 1500ms"},{"id":14333,"text":"TE 100ms; TR 20ms"},{"id":14334,"text":"TE 100ms; TR 600ms"}],"archived":false,"correctAlternativeId":14330,"explanation":"\u003cp\u003eT1-weighted images are created with short TEs (to reduce T2 contrast contribution) and short TRs (to prevent full recovery of longitudinal magnetisation)\u003c/p\u003e\u003cp\u003eThe TR must be longer than the TE.\u003c/p\u003e\u003cp\u003eShort TE with a long TR = proton density weighting\u003c/p\u003e\u003cp\u003eLong TE with a long TR = T2-weighting\u003c/p\u003e\u003cp\u003eLong TE with a short TR = noisy, low signal, low contrast image\u003c/p\u003e","id":2942,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2942","nextQuestionPath":"/articles/t1-relaxation-time/questions/2941","relatedArticles":[{"id":5852,"title":"T1 weighted image","link":"/articles/t1-weighted-image?lang=gb"},{"id":16494,"title":"T2 relaxation","link":"/articles/t2-relaxation?lang=gb"},{"id":22554,"title":"Relaxation","link":"/articles/relaxation?lang=gb"},{"id":16495,"title":"T2* relaxation","link":"/articles/t2-relaxation-1?lang=gb"},{"id":6345,"title":"T2 weighted image","link":"/articles/t2-weighted-image?lang=gb"},{"id":60744,"title":"Proton density weighted spin-echo images","link":"/articles/proton-density-weighted-spin-echo-images-1?lang=gb"}],"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 will have the most T1 contrast?\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/2942"}],"attemptsPercentages":[{"alternativeId":"14330","percentage":69},{"alternativeId":"14331","percentage":10},{"alternativeId":"14332","percentage":6},{"alternativeId":"14334","percentage":4},{"alternativeId":"14333","percentage":10}],"promptToLogin":false,"questionManager":false,"articleId":"t1-relaxation-time"}