Abstract
This paper describes a software correction of scatter coincidence in positron CT which is based on an estimation of scatter projections from true projections by an integral transform. Kernels for the integral transform are projected distributions of scatter coincidences for a line source at different positions in a water phantom and are calculated by Klein-Nishina's formula. True projections of any composite object can be determined from measured projections by iterative applications of the integral transform. The correction method was tested in computer simulations and phantom experiments with Positologica. The results showed that effects of scatter coincidence are not negligible in the quantitation of images, but the correction reduces them significantly.
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Bergström M, Eriksson L, Bohm C, Blomqvist G, Litton J (1983) Correction for scattered radiation in a ring detector positron camera by integral transform of the projections. J Comput Assist Tomogr 7:42–50
Endo M, Iinuma TA, Tanaka E, Tateno Y (1982) Effect of correction function on image characteristics of Positiologica: A positron CT device for the head. Eur J Nucl Med 7:130–136
Endo M, Iinuma TA, Nohara N, Tomitani T, Yamamoto M, Murayama H, Tanaka E (1983) Quantitation in Positologica I: A positron CT device for the head. Med Imaging Technol 1:23–27 (in Japanese with English summary)
Hoffman EJ, Huang SC, Phelps ME (1979) Quantitation in positron emission computed tomography: 1. Effect of object size. J Comput Assist Tomogr 3:299–308
Hoffman EJ, Huang SC, Phelps ME, Kuhl DE (1981) Quantitation in positron emission computed tomography: 4. Effect of accidental coincidence. J Comput Assist Tomogr 5:391–400
Huang SC, Hoffman EJ, Phelps ME, Kuhl DE (1979) Quantitation in positron emission computed tomography: 2. Effects of inaccurate attenuation correction. J Comput Assist Tomogr 3:804–814
Nohara N, Tanaka E, Tomitani T, Yamamoto M, Murayama H, Suda Y, Endo M (1980) Positologica: A positron ECT device with a continuously rotating detector ring. IEEE Trans Nucl Sci NS-27: 1128–1136
Phelps ME (1977) Emission computed tomography. Semin Nucl Med 7:337–365
Tanaka E, Nohara N, Tomitani T, Endo M (1982) Analytical study of the performance of a multilayer positron computed tomography scanner. J Comput Assist Tomogr 6:350–364
Tomitani T (1982) Electronics system for positron computerized tomography “Positologica” dedicated to head studies. Nucl Instrum Meth 197:507–516
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Endo, M., Iinuma, T.A. Software correction of scatter coincidence in positron CT. Eur J Nucl Med 9, 391–396 (1984). https://doi.org/10.1007/BF00295572
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DOI: https://doi.org/10.1007/BF00295572