Emission computed tomography

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

Types include positron emission tomography (PET) and Single-photon emission computed tomography (SPECT).

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

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