X-ray CT device

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PROBLEM TO BE SOLVED : To progress the setting of a tube voltage at which a contrast noise ratio to an exposed dose is improved, in the setting of a scan condition of an X-ray CT device. SOLUTION : A first fault image generated by a first X-ray tube voltage and a second fault image generated by a second X-ray tube voltage lower than the first X-ray tube voltage are re-constituted on the basis of projection data created by a preparatory scan, and there are decided, by using pixel values in the first and second fault images, a candidate of a scan condition at a main scan, a prediction value indicating the contrast noise ratio of the fault image when scanned under the condition of the candidate, and a prediction value indicating the exposed dose of a body to be inspected with respect to a candidate of a scan condition including the first X-ray tube voltage and a candidate of a scan condition including the second X-ray tube voltage, respectively. Then, at least the X-ray tube voltage, the prediction value indicating the contrast noise ratio and the prediction value indicating the exposed dose are indicated with respect to the respective candidates of the decided scan conditions. COPYRIGHT : (C)2013, JPO&INPIT