: Magnetic Resonance Perfusion Imaging of the Brain

: What This Test Measures

: MR perfusion imaging tracks the movement of a contrast agent (or, in some techniques, uses magnetic labeling of blood) through the blood vessels of the brain. It produces maps showing how much blood reaches different regions of brain tissue and how quickly it arrives and clears.

: How the Procedure Is Done

: You lie still on an MRI table, and the technologist obtains standard images before and during the perfusion sequence. A contrast dye may be injected through an IV line, and the scanner captures rapid images as the dye passes through the brain. The scan itself is painless, and the IV placement may cause brief discomfort.

: How to Prepare

: Follow your facility's instructions about fasting, medications, and whether to avoid caffeine beforehand. Tell the staff if you have implanted medical devices, metal in your body, kidney problems, or allergies to contrast dye, as these can affect safety or the type of scan used.

: What to Expect

: The study usually takes a short portion of a longer MRI session. You may feel mild warmth or a brief metallic taste when contrast is given. Most people can return to normal activities right afterward unless told otherwise; drink fluids if contrast was used to help clear it from your body.