Home
Radiology Guides Anatomy Physio & Path Medicine Physics Contact
SPECT-SINGLE PHOTON EMISSION COMPUTED TOMOGRAPHY

Physics

SPECT-SINGLE PHOTON EMISSION COMPUTED TOMOGRAPHY

1. SPECT is a tomographic imaging method of obtaining cross-sectional nuclear images with similarities to conventional CT.

2. Rather than detecting X-ray attenuation through a projection, we collect gamma ray counts. Radioactivity used to create the image is emitted from patient rather than transmitted through patient from an outside source as is done in X-ray imaging.

3. Essentially, a gamma camera rotates around the patient every 3° (or 6°), pauses for 30 seconds to acquire a projection and then advances another 3° (or 6°).

4. This is done 120 (or 60) times to cover a full 360° of the patient.

5. The data is then reconstructed using either filtered back projection or iterative reconstruction.

6. SPECT can be used to image any radiopharmaceutical in which: (a) t he distribution does not change significantly during the image acquisition time (20-40 minutes) (b) half-life to match the a cquisition time long enough for sufficient amount of gamma photons to be collected.


Avatar
REFERENCES

1. Bushberg, J. T. (2012). The essential physics of medical imaging. Philadelphia: Wolters Kluwer Health/Lippincott Williams & Wilkins. Find it at Amazon
2. Heggie, J. C., Liddell, N. A., & Maher, K. P. (1997). Applied imaging technology. Melbourne: St. Vincents Hospital.

Ⓒ A. Manickam 2018

+ Home