X-ray CT image taking apparatus and X-ray CT image taking...

Details X-ray CT image taking apparatus and X-ray CT image taking... X-ray CT image taking apparatus and X-ray CT image taking...

2006-12-05

2006-12-05

Ho, Allen C. (Department: 2882)

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

C378S015000, C378S901000

Reexamination Certificate

active

07145979

ABSTRACT:
To obtain a tomographic image suffering little from artifact and the determination of the quality of image.(1) Step 1: With the axis of abscissas as the fan angle or channel direction of an X-ray detector and the axis of ordinates as the projection angle direction of an X-ray source11,projection data are arranged side by side to thereby prepare a sinogram.(2) Step 2: from the sinogram, the projection data of an opposite fan beam is prepared at each projection angle.(3) Step 3: the degree of consistency with the projection data of the opposite fan beam is obtained at each projection angle.(4) Step 4: The region of reference error of the degree of consistency is obtained, and a projection angle region is determined from this region of reference error.(5) Step 5: the projection data in the projection angle region obtained at the step 4 is reconstructed to thereby prepare a tomographic image.

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Wesarg, S., et al., “Parker Weights Revisited,” Medical Physics, American Institute of Physics, New York, USA, vol. 29, No. 3 (Mar. 2002), pp. 372-378, XP012011740, ISSN: 0094-2405.

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