X-ray CT imaging method and X-ray CT apparatus

Details X-ray CT imaging method and X-ray CT apparatus X-ray CT imaging method and X-ray CT apparatus

2006-11-08

2009-02-17

Glick, Edward J (Department: 2882)

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

Reexamination Certificate

active

07492854

ABSTRACT:
The present invention provides the adjustment of CT value which is the pixel value of a tomographic image in the conventional scan (axial scan) or cinescan or helical scan by an X-ray CT apparatus incorporating a multi column X-ray detector or a two-dimensional X-ray detector of matrix arrangement represented by a flat panel X-ray detector. The gain and bias of the projection data of each row are adjusted prior to the three-dimensional back projection or prior to the reconstruction function convolution. Alternatively, the gain and bias are adjusted after determining the gain and bias value to adjust the CT value by taking into account the contribution rate of each row to the tomographic image after the three-dimensional back projection. Alternatively, the gain and bias are adjusted after determining the gain and bias value to adjust CT value by taking into account the contribution rate of each row to the tomographic image relying on the position of each row in z direction in case of axial scan after three-dimensional back projection.

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