Radiographic apparatus

A radiographic apparatus for obtaining sectional images from three-dimensional volume data of a region of interest of an object under examination generated by an image reconstruction of projection data acquired by radiographing the object from varied scan positions, said apparatus comprising:

• a radiation source for irradiating said object with penetrating electromagnetic waves in form of a divergent beam;
• an area detector opposed to said radiation source across said object for detecting electromagnetic waves transmitted through said object;
• scanning means for causing said radiation source and said area detector synchronously to revolve in an identical plane about a scan axis set substantially centrally of said region of interest;
• an image processor for performing a predetermined image processing on projection data detected in the varied scan positions;
• and
• a back projection unit for performing the image reconstruction to generate three-dimensional volume data of the region of interest by projecting the projection data processed by said image processor back to predetermined lattice points of a three-dimensional lattice virtually set to the region of interest of the object radiographed;
• said image processor applying a low-pass filtering to projection data in each row of pixels of said area detector perpendicular to a direction corresponding to said scan axis, said low-pass filtering being in accordance with a location on said scan axis to which said each row of pixels is projected.