| 摘要 |
Disclosed is a PET apparatus comprising a detecting unit; slice septa for transmitting therethrough, of flying photons, those nearly perpendicular to the center axis; a slice septa position determining section for determining, when a pair of photon detectors in photon detectors included in the detecting unit detect a photon pair, whether or not the slice septa exist in the measurement space side of at least one of the pair of photon detectors; a two-dimensional projection image storage section for storing, when it is determined by the slice septa position determining section that the slice septa exist on the measurement space side of at least one of the pair of photon detectors, coincidence-counting information of the photon pair obtained by the pair of photon detectors; a three-dimensional projection data storage section for storing, when it is determined by the slice septa position determining section that the slice septa do not exist on the measurement space side of any of the pair of photon detectors, coincidence counting information obtained by the pair of photon detectors; and an image reconstructing section for reconstructing, according to three-dimensional projection data generated by the two-dimensional projection data storage section from coincidence-counting information stored thereby and three-dimensional projection data generated by the three-dimensional projection data storage section from coincidence-counting information stored thereby, an image indicative of a spatial distribution of a frequency at which photon pairs are emitted in the measurement space.
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