Question

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PET, SPECT
- Concept
- Image formation
- Components

Answer 1

PET:Positron Emission Tomography

A positron emission tomography (PET) scan is an imaging test that helps reveal how your tissues and organs are functioning. A PET scan uses a radioactive drug (tracer) to show this activity. This scan can sometimes detect disease before it shows up on other imaging tests

A positron emission tomography (PET) scan is an imaging test that allows your doctor to check for diseases in your body. The scan uses a special dye containing radioactive tracers.

Concept :Positron emission tomography: Unlike CT or MRI, which look at anatomy or body form, PET studies metabolic activity or body function. ... The images show areas of abnormal metabolism, helping to detect tumors and other diseases that are often not detectable by other means.

Image formation:

Positron emission tomography (PET) is a form of nuclear imaging (nuclear because it uses radioactive chemicals) that produces a 3D image of the inside of the body. ... One of the main uses of PET is to diagnose cancer and see how far it has spread or hoThe radioisotopes typically used in SPECT to label tracers are iodine-123, technetium-99m, xenon-133, thallium-201, and fluorine-18. These radioactive forms of natural elements will pass through your body and be detected by the scanner.w well it is responding to treatment.

Components :

There are 4 main components a PET scan machine, the gantry (frame) that houses the detection apparatus with a large patient port (opening), the subject table that moves in and out of the patient port allowing for a complete scan, the detector/camera system that captures the image, and a computer system that processes

SPECT: Single-photon emission computed tomography

A SPECT scan is a type of nuclear imaging test, which means it uses a radioactive substance and a special camera to create 3-D pictures. While imaging tests such as X-rays can show what the structures inside your body look like, a SPECT scan produces images that show how your organs work

Concept :

Single-photon emission computed tomography (SPECT, or less commonly, SPET) is a nuclear medicine tomographic imaging technique using gamma rays. ... The technique needs delivery of a gamma-emitting radioisotope (a radionuclide) into the patient, normally through injection into the bloodstream.

Image formation : The SPECT machine is a large circular device containing a camera that detects the radioactive tracer your body absorbs. During your scan, you lie on a table while the SPECT machine rotates around you. ... The pictures are sent to a computer that uses the information to create 3-D images of your body

Components :