Many centres make regular measures of gamma camera performance as part of routine quality assurance programmes. Such measures may detect gradual deterioration in the camera but provide no basis on which to decide when corrective action should be taken. It is necessary to know when changes in camera performance are significant in terms of perceeved image quality
In this work, one index of performance, the full width half maximum (FWHM) of the line spread function, was degraded in a controlled manner and the ability of observers to detect this change in the images produced was examined. Both simple and complex objects were investigated. A suitable decision criterion was suggested which indicated that changes of about 0.3 mm in the FWHM of the camera could be detected in the image. This figure was essentially independent of the complexity of the image, the initial FWHM of the camera and, above 300 k, the number of counts in the image.
The way in which this type of experiment can help to establish a rational basis for gamma camera quality assurance programmes is discussed.
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Armitage P (1971) Statistical methods in medical research. Blackwell Scientific Publications, Oxford
Berkson J (1953) A statistically precise and relatively simple method of estimating the bio-assay with quantal response, based on the logistic function. J Am Stat Ass 48:565
Dye R.E.A. (1987) A fresh approach to problems in nuclear medicine imaging. Phys Med Biol 32:290
Elliot AT, Short MD, Barnes KJ (1986) Performance assessment of gamma cameras, part IV. DHSS Scientific and technical branch. STB/86/9. London: H.M.S.O.
Hoffer PB, Newman R, Quartararo L, Lange R, Hernandez T (1984) Improved intrinsic resolution-does it make a difference? J Nucl Med 25:230
Horton PW, Leach KG, Griffiths JT, Hawkins LA, O'Hewell D, Short MD, Todd JH, Turner PCR, Wilks RJ, Murray, KJ (1978) The theory, specification and testing of Anger-type gamma cameras. Topic Group Report 27. London: Hospital Physicists' Association
Kasal B, Sharp PF, Dendy PP (1983) Relationships between objective and subjective assessment of gamma camera image sharpness. Phys Med Biol 28:1127
Porter EH (1980) The statistics of dose/cure relationships for irradiated tumours. Br J Radiol 53:210
Raff U, Spitzer VM, Hendee WR (1984) Practicality of NEMA performance specification measurements for user-based acceptance testing and routine quality assurance. J Nucl Med 25:679
Sano RM (1980) Performance standards in medical radionuclide imaging, Vol 2. I.A.E.A. Vienna
Van Tuinen RJ, Kruger JB, Bahr GK, Sodd VJ (1978) Scintillation camera non-uniformity: effect on cold lesion detectibility. Int J Nucl Med Biol 5:135
Venema HW, Nagelkerke NJD (1984) Relationship between objective and subjective assessment of image sharpness. Phys Med Biol 29:600
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Dendy, P.P., Barber, R.W. & Bayliss, C.C. An experimental study of the relationship between image quality and spatial resolution for the gamma camera. Eur J Nucl Med 14, 579–585 (1988). https://doi.org/10.1007/BF00251779
- Gamma camera
- Image evaluation
- Quality assurance
- Spatial resolution