X-ray CT image taking apparatus and X-ray CT image taking method
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United States of America Patent
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Dec 5, 2006
Grant Date -
Dec 15, 2005
app pub date -
Jun 1, 2005
filing date -
Jun 15, 2004
priority date (Note) -
Expired
status (Latency Note)
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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 source 11, 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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