Abstract
The effects of correction function on image characteristics were studied experimentally for a positron CT device Positologica. Correction functions were obtained by smoothing the Shepp and Logan function by convolution of Gaussian functions. Signal-to-noise ratio (SNR) and spatial resolution were measured for phantoms and related to the magnitude of smoothing. The relation between SNR and spatial resolution is also discussed. Some suggestions are made to indicate how to select correction functions for clinical images. A flow of data processing for Positologica is described together with an outline of its hardware.
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References
Brooks RA, DiChiro G (1976) Principles of computer assisted tomography (CAT) in radiographic and radioisotopic imaging. Phys Med Biol 21:689–732
Derenzo SE, Budinger TF, Cahoon JL, Huesman RH, Jackson HG (1977) High resolution computed tomography of position emitters. IEEE Trans Nucl Sci NS-24:544–558
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, Hoffmann EJ, Huang SC, Kuhl DE (1978) ECAT: A new computerized tomographic imaging system for positron-emitting radiopharmaceuticals. JNM 19:635–647
Shepp LA, Logan BF (1974) The Fourier reconstruction of a head section. IEEE Trans Nucl Sci NS-21:21–43
Suda Y, Iinuma TA (1979) Positron camera-computer system for various section images. IEEE Trans Nucl Sci NS-26:2764–2767
Tanaka E, Iinuma TA (1975) Correction functions for optimizing the reconstructed image in transverse section scan. Phys Med Biol 20:789–798
Tanaka E, Nohara E, Yamamoto M, Tomitani T, Murayama H (1979) “Positology” — The search for suitable detector arrangements for a positron ECT with continuous rotation. IEEE Trans Nucl Sci NS-26:2728–2731
Ter-Pogossian MM, Phelps ME, Hoffman EJ, Mullani NA (1975) A positron-emission transaxial tomograph for nuclear imaging (PETT). Radiology 11:89–98
Yamamoto M (1981) Detector arrangement and sampling characteristics in a rotary positron emission computed tomography. Phys Med Biol 26:489–499
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Endo, M., Iinuma, T.A., Tanaka, E. et al. Effect of correction function on image characteristics of positologica: A positron CT device for the head. Eur J Nucl Med 7, 130–136 (1982). https://doi.org/10.1007/BF00256401
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DOI: https://doi.org/10.1007/BF00256401