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SPECT-COLLIMATOR

Physics

SPECT-COLLIMATOR

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.


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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

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