| 摘要 |
An emission computed tomography apparatus comprises a patient couch on which a subject on the dosage of rodioisotope (RI) lies and a two-dimensional position detector for collecting radioisotope distribution data in the subject at various rotation positions while rotating around the subject and the patient couch in order to obtain a tomogram image of the RI distribution in the subject. In order to eliminate a false image (artifact) on the tomogram image resulting form unequal detection characteristics in the position detector, the patient couch is traveled in one direction of the coordinate systems every time the position detector is rotated by a given angle. One position signal from the position detector is corrected in response to the traveling length of the patient couch. An artifact-free tomogram image of the RI distribution is obtained on the basis of the corrected position signal and another position signal from the position detector.
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