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Correction of Nonuniform Response in the Reconstruction for Single Photon Emission Computed Tomography with a Spatially Varying Focal Length Collimator

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Abstract

SPECT (single photon emission computed tomography) images can visualize physiological functions directly and are diagnostically useful. The reconstruction methods based on the Continuous-Discrete (C-D) mapping model have an immediate effect on SPECT imaging because they employ photon detection kernels describing the photon transport from the body to the detector. However, in a spatially varying focal length geometry, the concentration of the sensitivity around the center of rotation of the detector causes a change in the response from the original image to the reconstructed image. As a result, a false hot spot often appears around the center of rotation. This paper presents a convenient method to repress the change by correcting the resolving kernels. Numerical simulations show that the method can reduce the false hot spots.

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Authors and Affiliations

  1. Imaging Science and Engineering Laboratory, Tokyo Institute of Technology, 4259, Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan

    Masahiro Mimura, Takashi Obi, Masahiro Yamaguchi & Nagaaki Ohyama

  2. Cancer Information and Epidemiology Division, National Cancer Center Research Institute, 5-1-1, Tsukiji, Chuo-ku, Tokyo, 104-0045, Japan

    Masahiro Mimura

Authors
  1. Masahiro Mimura
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  2. Takashi Obi
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  3. Masahiro Yamaguchi
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  4. Nagaaki Ohyama
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Correspondence to Takashi Obi.

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Mimura, M., Obi, T., Yamaguchi, M. et al. Correction of Nonuniform Response in the Reconstruction for Single Photon Emission Computed Tomography with a Spatially Varying Focal Length Collimator. OPT REV 5, 275–279 (1998). https://doi.org/10.1007/s10043-998-0275-6

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  • DOI: https://doi.org/10.1007/s10043-998-0275-6

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