Patent ID: 7570735
Filing Date: 2009-08-04
Classification: A61B

Abstract:
1. An X-ray CT scanner including an X-ray source that irradiates X-rays to an object, an X-ray detector composed of a plurality of X-ray detecting elements which convert X-rays penetrating the object into electric signals at every timing of projection, a data correction means for correcting an output of the X-ray detector, and an arithmetic processing means for performing arithmetic processing on an output of the data correction means so as to reconstruct an image, comprising: a first memory means in which data of the response characteristic of the X-ray detector that is the afterglow-related characteristic thereof and that is measured in advance is stored; and a second memory means in which output data items produced by the X-ray detector over past projections and corrected by the data correction means on the basis of the response characteristic data are stored, wherein: the data correction means includes an afterglow correction means that uses the response characteristic data stored in the first memory means and the plurality of output data items, which are produced over a plurality of past projections and stored in the second memory means, to compensate both an adverse effect of inflow of signals from the past projections due to afterglow on output data producing current projection, and an adverse effect of outflow of signals to future projections.