![]() ![]() American College of Radiology and the Society for Pediatric Radiology. ACR–SPR Practice parameter for the performance of single photon emission computed tomography (SPECT) brain perfusion imaging, including brain death examinations.National Institute of Biomedical Imaging and Bioengineering. Your body breaks down the remaining tracer over the next few days. Your doctor may instruct you to drink more fluids, such as juice or water, after your SPECT scan to help flush the tracer from your body. Most of the radioactive tracer leaves your body through your urine within a few hours after your SPECT scan. How long your scan takes depends on the reason for your procedure. The pictures are sent to a computer that uses the information to create 3D images of your body. The SPECT machine takes pictures of your internal organs and other structures. During your scan, you lie on a table while the SPECT machine rotates around you. The SPECT machine is a large circular device containing a camera that detects the radioactive tracer your body absorbs. For instance, during a seizure, the area of your brain causing the seizure may retain more of the radioactive tracer, which allows doctors to pinpoint the area of your brain causing your seizures. ![]() Your body's more active tissues will absorb more of the radioactive substance. In some cases, you may need to wait several hours or, rarely, several days between the injection and your SPECT scan. You may be asked to lie quietly in a room for 20 minutes or more before your scan while your body absorbs the radioactive tracer. The tracer dose is very small, and you may feel a cold sensation as it enters your body. You'll receive a radioactive substance through an intravenous (IV) infusion into a vein in your arm. SPECT scans involve two steps: receiving a radioactive injection (called a tracer) and using a SPECT machine to scan a specific area of your body. Then the SPECT machine rotates around you, taking pictures of internal organs and other structures highlighted by the radioactive tracer in your body.
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