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1. Single head - based on a standard gamma camera mounted on a rotating gantry. Largely superseded by multiple head scanners.

2. Multiple heads - still uses standard gamma camera technology but there are 2 (or even 3) cameras orbiting the patient. Quicker acquisition. Reduces motion artefact.

3. Hybrid SPECT/CT - has a dual head gamma camera as well as a fan beam X-ray source. Capable of normal CT and SPECT. Allows the fusion of SPECT (functional) and CT (anatomical) information to produce composite images.


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

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