(e) If PM tubes and the PHA of a gamma camera have MTFs of 0.5 and
0.7 at a certain spatial frequency, what is the overall MTF of the
camera?
(f) As the sensitivity of a gamma camera increases, its spatial resolution
decreases. True or false?
(g) The collimator efficiency of a parallel-hole collimator is not affected
by the source-to-detector distance. True or false?- (a) What is the primary cause of nonuniformity in an image?
(b) What is edge packing?
(c) How is the nonuniformity in an image corrected? - (a) What is the contrast of an image?
(b) What are the different factors that affect the contrast of an image?
(c) How does pulse pileup affect the contrast?
(d) Is contrast or spatial resolution affected by increasing the adminis-
tered activity? - (a) What are the daily and weekly tests performed for gamma cameras?
(b) What is meant by extrinsic and intrinsic tests?
References and Suggested Readings
Bushberg JT, Seibert JA, Leidholdt EM Jr, Boone JM.The Essential Physics of
Medical Imaging. 2nd ed. Philadelphia: Lippineott Williams & Wilkins; 2002.
Cherry SR, Sorensen JA, Phelps ME.Physics in Nuclear Medicine. 3rd ed. Philadel-
phia: W.B. Saunders; 2003
Erickson J. Imaging systems. In: Harbert J, da Rocha AFG, ed.Textbook of Nuclear
Medicine. Volume I. Basic Science. Philadelphia: Lea & Febiger; 1984:105.
Groch MW, Erwin WD. Single-photon emission computed tomography in the year
2001: Instrumentation and quality control. J Nucl Med Technol. 2001;29:12.
Murphy PH. Acceptance testing and quality control of gamma cameras, including
SPECT.J Nucl Med1987;28:1221.
Rollo FD. Evaluating imaging devices. In: Rollo FD, ed.Nuclear Physics, Instru-
mentation and Agents. St. Louis: Mosby; 1977:436.
Rollo FD, Harris CC. Factors affecting image formation. In: Rollo FD, ed.Nuclear
Physics, Instrumentation and Agents. St. Louis: Mosby; 1977:387.
138 10. Performance Parameters of Gamma Cameras