| 摘要 |
In a positron emission computed tomography apparatus of the present invention, a calibration radiation source is rotated in a measurement space in a detector ring comprised of a lot of photon detectors to perform blank measurement, and sensitivity data are produced on the basis of photon pair detection frequencies obtained for every photon detector pair of the detector ring. Subsequently, an object is set in the measurement space to perform emission measurement, and detection pair identification signals (I, J) from a coincidence counting circuit are subjected to compensation for body motion of the object measured by a position-direction measuring section and then are converted into polar coordinate values of a detector line. At the same time, cumulative data inversely proportional to corresponding values of sensitivity data are produced on the basis of the detection pair identification signals (I, J). Then this cumulative data is cumulated at an address in an address space corresponding to the coordinate values of the detector line to be accumulated as projection data. Therefore, even with an object moving during measurement, an accurate reconstructed image can be attained by effecting body motion correction of the object and accurate sensitivity correction.
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