Question 499
{"accessible":false,"alternatives":[{"id":2499,"text":"fast spin echo (FSE)\r\n"},{"id":2501,"text":"fluid attenuation inversion recovery (FLAIR)"},{"id":2503,"text":"short tau inversion recovery (STIR)"},{"id":2500,"text":"proton density (PD)"},{"id":2502,"text":"susceptibility weighted imaging (SWI)"}],"archived":false,"correctAlternativeId":2502,"explanation":"\u003cp\u003eAn\u0026nbsp;important feature of gradient echo sequences (GE sequences) is that the dephasing of spinning protons occurs as a result of\u0026nbsp;T2* decay\u0026nbsp;and this is susceptible to static magnetic field inhomogeneities (such as degraded blood products, and metal objects on the signal).\u003c/p\u003e\u003cp\u003eA spin echo (SE) is also susceptible to these effects, but (at least one) refocusing pulse removes the T2* effect. A GE sequence does not have a refocusing pulse.\u003c/p\u003e\u003cp\u003eSusceptibility weighted\u0026nbsp;imaging (SWI) is a GE sequence particularly sensitive to T2* effects.\u003c/p\u003e","id":499,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2957","nextQuestionPath":null,"relatedArticles":[{"id":6132,"title":"Intracerebral hemorrhage","link":"/articles/intracerebral-haemorrhage?lang=us"},{"id":18339,"title":"Gradient echo sequences","link":"/articles/gradient-echo-sequences-1?lang=us"},{"id":21760,"title":"Fluid attenuated inversion recovery","link":"/articles/fluid-attenuated-inversion-recovery?lang=us"},{"id":37346,"title":"MRI sequences (overview)","link":"/articles/mri-sequences-overview?lang=us"}],"alsoUsedIn":[{"id":977,"kind":"RestrictedPage","title":"Page 977 (in no courses)","link":"https://radiopaedia.org/admin/restricted_pages/977"},{"id":976,"kind":"Course","title":"2021 Virtual Conference Private Use - page 976","link":"https://radiopaedia.org/courses/2021-virtual-conference-private-use/pages/976"},{"id":976,"kind":"Course","title":"2022 Virtual Conference Private Use - page 976","link":"https://radiopaedia.org/courses/2022-virtual-conference-private-use/pages/976"},{"id":970,"kind":"RestrictedPage","title":"Page 970 (in no courses)","link":"https://radiopaedia.org/admin/restricted_pages/970"},{"id":955,"kind":"RestrictedPage","title":"Page 955 (in no courses)","link":"https://radiopaedia.org/admin/restricted_pages/955"},{"id":1,"kind":"LiveSchedule","title":"1","link":"https://radiopaedia.org/admin/live_schedules/1"},{"id":11,"kind":"LiveSchedule","title":"11","link":"https://radiopaedia.org/admin/live_schedules/11"},{"id":1344,"kind":"Course","title":"2022 Virtual Conference Private Use - page 1344","link":"https://radiopaedia.org/courses/2022-virtual-conference-private-use/pages/1344"},{"id":1200,"kind":"Course","title":"2022 Virtual Conference Private Use - page 1200","link":"https://radiopaedia.org/courses/2022-virtual-conference-private-use/pages/1200"},{"id":248,"kind":"LiveSchedule","title":"248","link":"https://radiopaedia.org/admin/live_schedules/248"},{"id":155,"kind":"LiveSchedule","title":"155","link":"https://radiopaedia.org/admin/live_schedules/155"},{"id":927,"kind":"Course","title":"2021 Virtual Conference Private Use - page 927","link":"https://radiopaedia.org/courses/2021-virtual-conference-private-use/pages/927"},{"id":927,"kind":"Course","title":"CT \u0026 MRI Lectures - page 927","link":"https://radiopaedia.org/courses/ct-mri-lectures/pages/927"},{"id":1184,"kind":"Course","title":"Adult Neuroradiology Review Course - page 1184","link":"https://radiopaedia.org/courses/adult-neuroradiology-review-course/pages/1184"},{"id":1184,"kind":"Course","title":"Adult Neuroradiology Review Course - page 1184","link":"https://radiopaedia.org/courses/adult-brain-mri-review-course-2015-online-video/pages/1184"},{"id":1204,"kind":"Course","title":"2022 Virtual Conference Private Use - page 1204","link":"https://radiopaedia.org/courses/2022-virtual-conference-private-use/pages/1204"}],"stem":"\u003cp\u003eIntracerebral hemosiderin is best demonstrated on what MRI sequence?\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/499"}],"attemptsPercentages":[{"alternativeId":"2499","percentage":2},{"alternativeId":"2502","percentage":86},{"alternativeId":"2503","percentage":4},{"alternativeId":"2501","percentage":6},{"alternativeId":"2500","percentage":2}],"promptToLogin":false,"questionManager":false,"articleId":"short-tau-inversion-recovery"}