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1. Use high resolution collimator to maximise spatial resolution throughout depth of the patient & reduce image distortion during reconstruction.

2. Use appropriate hole direction
- Parallel holes: hole and septae size as uniform as possible.
- Non-parallel holes: can only be used with circular (i.e. not body contouring) orbits e.g. heads.

3. Use appropriate collimator type - use fan-beam collimator for brain imaging which utilises magnification (uses more of the detector field of view to collect the image data).

4. Ensure smallest camera-patient distance but maintain safe distance - infra-red beams fitted to collimator face that enable automatic body contouring to minimise the detector-patient distance and optimise image quality. Fitted with pressure sensitive safety devices to prevent any contact between the collimators and the patient.

5. Ensure patient table is comfortable & low-attenuation - needs to be comfortable due to long image acquisition times. Low attenuation of gamma photons to allow photons to pass through and enable 360 degree acquisition.


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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