Patent ID: 8611625
Filing Date: 2013-12-17
Classification: A61B

Abstract:
1. A tomographic apparatus for acquiring a sectional image, comprising: an attenuation quantity measuring device for measuring an X-ray attenuation quantity by emitting X-rays to a phantom having a known thickness; an attenuation quantity calculating device for calculating an X-ray attenuation quantity assuming X-rays are emitted to a filter formed of a predetermined material having the known thickness; a correction quantity calculating device for calculating as a correction quantity a ratio between the measured X-ray attenuation quantity and the calculated X-ray attenuation quantity; a correction function calculating device for calculating, based on correction quantities calculated with a plurality of known thicknesses, a correction function showing a relationship between the measured attenuation quantity and the correction quantity; and a transmission length calculating device for calculating a transmission length by acquiring from the correction function a correction quantity corresponding to an X-ray attenuation quantity measured by emitting X-rays to a subject, correcting the X-ray attenuation quantity measured by emitting X-rays to the subject with the acquired correction quantity, and converting the corrected X-ray attenuation quantity into a thickness of the predetermined material; the sectional image being acquired based on the transmission length.