Patent ID: 6561695
Filing Date: 2003-05-13
Classification: A61B

Abstract:
A CT-apparatus comprising an investigation bore with an X-ray source (3) and an X-ray detector (7) to generate an X-ray transmission image (20) of an object to be investigated, a table with an elongated tabletop (1) with a first longitudinal direction (z) to support the object, which tabletop (1) is translatable into the investigation bore in its first longitudinal direction (z), which tabletop (1) comprises elongated mutually parallel insertions (10) of a contrast material relative to the material of the tabletop (1) for calibration purposes, said contrast material having a different X-ray attenuation coefficient than the material of the tabletop, said insertions (10) having a second longitudinal direction (x), characterized in that the insertions (10) are arranged with the second longitudinal direction (x) orthogonally to the first longitudinal direction (z), wherein the spacing (s) between the insertions (10) in the first longitudinal direction (z) is smaller than a dimension of the X-ray detector (7) in the first longitudinal direction (z).