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index [2020/02/01 18:22] – icna | index [2022/01/24 21:55] – Kristen Scheitler, MD @k_scheitler Via Twitter administrator@icnapedia.org | ||
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+ | <nspages .:content -h1 -actualTitle -textPages=" | ||
+ | ~~AUTHORS: | ||
+ | ====== Quick yet systematic approach to MR imaging of brain lesions ====== | ||
+ | In general, there are 4 MR sequences that will tell you 99% of what you need to know: | ||
+ | |||
+ | 1. T2 FLAIR | ||
+ | 2. T1 post-contrast | ||
+ | 3. DWI | ||
+ | 4. GRE/ | ||
+ | |||
+ | 1. T2 FLAIR: "What is grossly abnormal?" | ||
+ | anything abnormal = bright on T2 FLAIR | ||
+ | 2. T1+gadolinium*: | ||
+ | |||
+ | Also: | ||
+ | -"What is the vascular composition?" | ||
+ | always compare T1+gad sequences to pure T1 without contrast (if also bright on pure T1, then BBB not necessarily disrupted) | ||
+ | {{:: | ||
+ | 3. DWI*: | ||
+ | bright = abnormal = " | ||
+ | **the above applies only if the corresponding area is dark on ADC sequence (if also bright on ADC, then just T2 shine-through)** | ||
+ | {{:: | ||
+ | 4. GRE/ | ||
+ | in general, abnormal = dark (blood, vascularity, | ||
+ | {{:: | ||
- | <nspages .: |