Patent ID: 8180016
Filing Date: 2012-05-15
Classification: A61B,G01N

Abstract:
1. An X-ray CT apparatus, comprising: an X-ray irradiating unit that irradiates X-rays onto a subject; an X-ray measuring unit that opposes said X-ray irradiating unit across said subject and measures the number of transmitted X-rays within a specific energy range that corresponds to an object to be inspected inside said subject, from among the transmitted X-rays that pass through said subject; a thickness computing unit that computes the thickness of said object to be inspected on the basis of the number of said transmitted X-rays measured by said X-ray measuring unit; and an image reconstructing unit that reconstructs a CT image on the basis of the thickness of said object to be inspected as computed by said thickness computing unit, wherein said object to be inspected is an X-ray contrast medium, said specific energy range is set above and below the K-absorption edge of said X-ray contrast medium, said thickness computing unit obtains the thickness t said image reconstructing unit uses, as projection data, the thickness of said object to be inspected which is computed by said thickness computing unit, performs convolution of said projection data and a predetermined reconstruction function, and generates a CT image of said subject through back projection of the convolution result, the ratio Φ1/Φ2 being given by the following formula: wherein overbarred μ