A positron emission tomography, also known as a PET scan, produces 3-D color images of the processes within the human body. What the CAT scan machine is like. MRI, or magnetic resonance imaging, is a well-established technique in modern medicine. The computer combines information from the two scans to provide a … A PET scanner is a large machine with a round, donut-shaped hole in the middle. The actual PET scan takes about 45 minutes. 1 Definitions; 2 Comparison chart; 3 MRI vs PET scan; Definitions MRI scanning machine. A PET scan uses a radiotracer to measure things like blood flow, oxygen use and sugar metabolism. If you have a fear of tight, closed spaces, you may get a drug to help keep you calm. There are several differences between MRI and PET types of scanning. Multiple rings of detectors inside the machine record the energy emissions from the radiotracer in your body. When it starts, the table slides quickly through the hole in the center. The entire PET scan process takes about two hours. Open MRI machines have two flat magnets on the top and bottom areas, with a large space to accommodate the patient. A PET scan shows how your tissues and organs are functioning. Then the table slides slowly back and … The PET scan machine is a big, open circle -- like a standing donut -- with a table that moves in and out of it. We will take a closer look at them. I get PET/CT scans when I go, I get CT first then the PET portion starts. By combining it with CT or MRI technology, doctors are given a more precise portrait of how advanced, aggressive, or likely a disease may be. It is the same machine as CT.. It looks similar to a CT or MRI unit. What does the equipment look like? During this time, you’ll need to sit quietly and limit your movements. Wide-open design MRI machines allow patients to look around the exam room, watch television, or, (especially with children), remain near a family member. A PET scanner is a large machine with a round, doughnut shaped hole in the middle, similar to a CT or MRI unit. Contents. A PET scan is a sophisticated tool that helps us look beyond the damage caused by a disease to the way in which our body responds to it. The wider space inside the PET machine and it's open ends mean that patients who usually feel claustrophobic find the PET scan a more comfortable procedure than having the old-type of exam. It can take up to 60 minutes for your body to absorb the injected radiotracer. This helps show if you are in the right position. A lung PET scan is typically combined with a lung CT scan to detect conditions like lung cancer. PET scans are often used to diagnose a … The CT scanner used for my scans was an open device that looked much like the one pictured above.However, other CAT scan machines are bigger contraptions that automatically move you into a long, narrow tunnel. The PET-CT machine looks like a large donut. 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