Patent ID: 7428290

Claim:
An X-ray CT apparatus comprising: an X-ray data acquisition device for acquiring projection data items of X-rays transmitted by a subject positioned between an X-ray generator and a two-dimensional X-ray area detector that is opposed to the X-ray generator, that detects X-rays, that is represented by a multi-array X-ray detector or a flat-panel X-ray detector, and that has a matrix structure, while rotating the X-ray generator and two-dimensional X-ray area detector about a center of rotation located between the X-ray generator and two-dimensional X-ray area detector; an image reconstruction device for reconstructing an image using projection data items acquired by the X-ray data acquisition device; an image display device for displaying a reconstructed tomographic image; and a radiographic condition designation device for designating radiographic conditions for tomography, wherein: the image reconstruction device controls a slice thickness by employing z-direction filter convolution in an image space after employing z-direction filter convolution in a projection data space.