PCT No. PCT/JP86/00094 Sec. 371 Date Oct. 15, 1986 Sec. 102(e) Date Oct. 15, 1986 PCT Filed Feb. 26, 1986 PCT Pub. No. WO86/05084 PCT Pub. Date Sep. 12, 1986.The present invention provides a CAT (computerized axial tomography) scanner in which x-ray detector output currents are utilized efficiently and can be measured correctly, and which reconstructs an image of an object (11) under scrutiny without being materially affected by variations in the intensity of x-rays. The scanner has an x-ray tube (1) for continuously producing x-rays, which are directed toward an array (2) of x-ray detectors through the object (11). Capacitors (31-3502) are charged by the output currents from the x-ray detectors (21-2502) of the array. A control circuit controls first switches (41-4502) and a second switch (6) in such a way that each capacitor initiates a cyclic process immediately after the previous capacitor is fully discharged. The cyclic process consists of a measurement, a resetting, and a charging. The control circuit also controls the order in which the cyclic operations are initiated, in such a way that the output currents from the x-ray detectors disposed near the center of the array and the output currents from reference x-ray detectors are measured at quite close instants.
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