Patent ID: 7949088
Filing Date: 2011-05-24
Classification: A61B,G06T

Abstract:
1. An X-ray CT apparatus comprising: an X-ray irradiation unit configured to apply X-rays based on a first X-ray tube voltage and X-rays based on a second X-ray tube voltage different from the first X-ray tube voltage to a subject by being switched every at least one view; a projection data acquisition unit configured to acquire projection data of the X-rays applied to the subject, the projection data identifying X-ray tube voltage information about the applied X-rays; and an image reconstruction unit configured to identify first energy projection data of the X-rays based on the first X-ray tube voltage, second energy projection data of the X-rays based on the second X-ray tube voltage, and transient energy projection data acquired upon switching between the first X-ray tube voltage and the second X-ray tube voltage based on the X-ray tube voltage information, said image reconstruction unit comprising a conversion processor configured to convert at least the transient energy projection data to another data using the transient energy projection data, and to perform image reconstruction using at least the data subsequent to the conversion process.