发明名称 |
Method and apparatus of X-ray computerized tomography |
摘要 |
A method of X-ray computerized tomography whereby a scanner in which an X-ray source for irradiating an X-ray in a cone-beam shape to an object and a two-dimensional detector for detecting the X-ray transmitted through the object are installed is rotated around the object and a projection angle is changed and a distribution of X-ray attenuation coefficients of the object is reconstructed from the transmitted X-ray images obtained at a plurality of projection angles. This method has the steps of: (1) measuring a first transmitted X-ray image measured in a state in which a contrast medium is injected into the object, a second transmitted X-ray image measured in a state in which no contrast medium is injected into the object, and a third transmitted X-ray image measured in a state in which no object is positioned in the apparatus; (2) calculating a first projection image from a difference between logarithms of the first and second transmitted X-ray images obtained at the same projection angle, calculating a second projection image from a difference between logarithms of the second and third transmitted X-ray images obtained at the same projection angle, and simultaneously reconstructing a first reconstructed image from the first projection image and a second reconstructed image from the second projection image in parallel; and (3) composing the first and second reconstructed images, thereby forming a composed image.
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申请公布号 |
US5802133(A) |
申请公布日期 |
1998.09.01 |
申请号 |
US19960757996 |
申请日期 |
1996.11.27 |
申请人 |
HITACHI MEDICAL CORPORATION |
发明人 |
KAWAI, HIROYUKI;SEKIHARA, KENSUKE |
分类号 |
A61B6/00;A61B6/03;(IPC1-7):A61B6/03 |
主分类号 |
A61B6/00 |
代理机构 |
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