Emission computed tomography (ECT) is a type of tomography involving radioactive emissions. Types include

positron emission tomography Positron emission tomography (PET) is a functional imaging technique that uses radioactive substances known as radiotracers to visualize and measure changes in Metabolism, metabolic processes, and in other physiological activities including bl ...

(PET) and

Single-photon emission computed tomography Single-photon emission computed tomography (SPECT, or less commonly, SPET) is a nuclear medicine tomographic imaging technique using gamma rays. It is very similar to conventional nuclear medicine planar imaging using a gamma camera (that is, ...

(SPECT). The imaging agent used in SPECT emits gamma rays, as opposed to the

positron The positron or antielectron is the antiparticle or the antimatter counterpart of the electron. It has an electric charge of +1 '' e'', a spin of 1/2 (the same as the electron), and the same mass as an electron. When a positron collides ...

emitters (such as ¹⁸F) used in PET. There are a range of radiotracers (such as ^99mTc, ¹¹¹In, ¹²³I, ²⁰¹Tl) that can be used, depending on the specific application.

References

Tomography 3D nuclear medical imaging {{med-diagnostic-stub