Question 1366
{"accessible":false,"alternatives":[{"id":6810,"text":"On T1 CSF is bright whereas it is dark on T2."},{"id":6811,"text":"On T1 CSF is dark whereas it is bright on T2."},{"id":6812,"text":"On T1, white matter is grey and grey matter is white whereas the opposite is true on T2. "},{"id":6813,"text":"On T1, white matter is white and grey matter is grey whereas the opposite is true on T2. "}],"archived":false,"correctAlternativeId":6813,"explanation":"\u003cp\u003eAlthough it is true that on a standard T2 weighted image CSF will be bright, whereas it will be dark on T1 weighted images, FLAIR - an extremely\u0026nbsp;commonly obtained sequence - is also T2 weighted but has the high signal from CSF attenuated. As such, relying on CSF signal is unreliable.\u0026nbsp;\u003cbr\u003e\u003cbr\u003eInstead, the relationship between white and grey matter is far more robust and easy to remember:\u0026nbsp;\u003c/p\u003e\u003cp\u003eT1 white is white and grey is grey. T2 is the opposite.\u0026nbsp;\u003c/p\u003e","id":1366,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/1366","nextQuestionPath":"/articles/mri-sequences-overview/questions/711","relatedArticles":[{"id":5852,"title":"T1 weighted image","link":"/articles/t1-weighted-image?lang=us"},{"id":6345,"title":"T2 weighted image","link":"/articles/t2-weighted-image?lang=us"},{"id":21760,"title":"Fluid attenuated inversion recovery","link":"/articles/fluid-attenuated-inversion-recovery?lang=us"}],"alsoUsedIn":[{"id":492,"kind":"Course","title":"Neurodegenerative Learning Pathway - page 492","link":"https://radiopaedia.org/courses/neurodegenerative-learning-pathway/pages/492"},{"id":1052,"kind":"Course","title":"Neurodegenerative Learning Pathway - page 1052","link":"https://radiopaedia.org/courses/neurodegenerative-learning-pathway/pages/1052"},{"id":1052,"kind":"Course","title":"[TRIAL] Neurodegenerative Learning Pathway - page 1052","link":"https://radiopaedia.org/courses/trial-neurodegenerative-learning-pathway/pages/1052"}],"stem":"\u003cp\u003eWhat is the most reliable way to distinguish a T1 weighted sequence from a T2 weighted 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/1366"}],"attemptsPercentages":[{"alternativeId":"6812","percentage":5},{"alternativeId":"6811","percentage":31},{"alternativeId":"6810","percentage":2},{"alternativeId":"6813","percentage":62}],"promptToLogin":false,"questionManager":false,"articleId":"mri-sequences-overview"}