Question 2960
{"accessible":false,"alternatives":[{"id":14411,"text":"can be either gradient or spin echo sequences"},{"id":14412,"text":"can only generate T2 weight images"},{"id":14413,"text":"provides improved spatial resolution"},{"id":14414,"text":"utilizes rewinder phase encoding gradients between echoes"}],"archived":false,"correctAlternativeId":14411,"explanation":"\u003cp\u003eEPI sequences can be either spin echo or gradient echo sequences.\u003c/p\u003e\u003cp\u003eThey usually fill fewer rows of k-space (reduction in matrix size) which reduces spatial resolution.\u003c/p\u003e\u003cp\u003eEach echo is separated by a small phase encoding gradient (known as a phase blip). This adds incrementally more phase to each echo. No rewinder gradients are used.\u003c/p\u003e\u003cp\u003eEPI sequences can generate both T1 and T2 weighted images depending on the TE and TR used.\u003c/p\u003e","id":2960,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2962","nextQuestionPath":"/articles/diffusion-weighted-imaging-2/questions/1420","relatedArticles":[{"id":22136,"title":"Spin echo sequences","link":"/articles/spin-echo-sequences?lang=us"},{"id":19116,"title":"Echo planar imaging","link":"/articles/echo-planar-imaging-1?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":60745,"title":"Fast spin echo","link":"/articles/fast-spin-echo?lang=us"}],"alsoUsedIn":[{"id":1928,"kind":"Course","title":"Imaging Physics: MRI - page 1928","link":"https://radiopaedia.org/courses/imaging-physics-mri/pages/1928"}],"stem":"\u003cp\u003eWhich of the following is true regarding echo planar imaging (EPI)?\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/2960"}],"attemptsPercentages":[{"alternativeId":"14414","percentage":16},{"alternativeId":"14411","percentage":60},{"alternativeId":"14412","percentage":14},{"alternativeId":"14413","percentage":10}],"promptToLogin":false,"questionManager":false,"articleId":"diffusion-weighted-imaging"}