Single photon emission computed tomography

From Academic Kids

SPECT (Single Photon Emission Computed Tomography) is a nuclear medicine tomographic imaging technique using gamma rays. The technique results in a set of image slices through a patient, showing the distribution of a radiopharmaceutical. There are several steps involved in producing the final set of slices.

Firstly a patient is injected with a gamma-emitting radiopharmaceutical. Then a series of projection images are acquired using a gamma camera. The acquisition involves the gamma camera rotating around the patient acquiring images at various positions. The number of images and the rotation angle covered varies depending on the type of investigation required, but a typical example involves the gamma camera rotating 360 degrees around the patient, acquiring 64 equally spaced images.

The projection images are stored digitally and a sophisticated computer program is used to process them and produce the slices (this is called reconstruction). There are a number of different methods for performing the reconstruction. At the time of writing (2004), by far the most commonly used method is 'filtered back projection'.

Other tomographic imaging modalities include:


SPECT tracers

RadioisotopeEmission energy (keV)Half-lifeTracerUse
Technetium-99m1406 hoursMDPBone imaging
---MIBI/TetrofosminMyocardial perfusion imaging
Iodine-12315913 hoursFP-CITDopamine system: D2 transporter
---MIBGCardiac imaging
Iodine-1313608 daysMIBGNeural crest tumour imaging

This is not a complete list.

See also

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