Brain MRI with Diffusion-Weighted Imaging and Apparent Diffusion Coefficient Mapping (for Stroke Assessment)

What This Test Measures

This test uses advanced MRI technology to create detailed images of brain tissue. It specifically measures how water moves within brain cells, which is disrupted in stroke injuries. The results help doctors distinguish between healthy and damaged brain areas, often highlighting regions where blood flow has been blocked or bleeding has occurred.

Why It’s Ordered

Your doctor may recommend this test if you’ve experienced sudden symptoms like numbness, weakness, confusion, or vision changes—common signs of stroke. It’s also used to confirm stroke diagnosis, monitor stroke progression, or evaluate recovery after treatment.

Sample and Procedure

No blood or urine sample is taken for this test. Instead, you’ll lie still on an MRI machine while the machine uses strong magnetic fields and radio waves to create images of your brain. The procedure typically takes 30–60 minutes and may involve lying very still for extended periods.

What to Expect After

After the test, you can usually return to normal activities immediately. There may be mild discomfort from lying still, but no lasting effects. If you had contrast dye (rarely used in this test), watch for signs of allergic reaction (e.g., rash, itching). Follow-up may include additional imaging or doctor visits to review results.