Abstract: A multi-slice X-ray CT scanner is provided to realize high resolution and a wide scanned region in a slice-thickness direction for an object. In the X-ray CT scanner, an X-ray beam for slice imaging is radiated toward an object and scanned in a predetermined slice-thickness direction, a direction orthogonal to the slice-thickness direction being defined as a channel direction. The scanner comprises a two-dimensional X-ray detector, a data acquisition system, and an electrically combining unit. The detector has a plurality of X-ray detecting elements arranged in a two-dimensional array of both rows in the slice-thickness direction and columns in the channel direction, the detecting elements of each row being arranged in unequal pitches. The data acquisition system has a plurality of data acquiring elements arranged in a two-dimensional array of rows and columns, acquiring signals detected by the two-dimensional X-ray detector, and producing digital data proportional to the detected signals.

Abstract: In an X-ray CT (computerized tomographic) imaging system, a plurality of X-ray detectors, data acquisition circuitry and an image reconstruction unit are provided. The data acquisition circuitry includes a plurality of A/D converter units. The X-ray image signals derived from the plurality of X-ray detectors are A/D-converted by the corresponding ones of the A/D converter units into corresponding X-ray image data. Then, the X-ray image data obtained from the respective A/D converter units is sequentially transferred via a digital data bus to the image reconstruction unit.