IMAGE RECONSTRUCTION METHOD AND X-RAY CT APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide an image reconstruction method and an X-ray CT apparatus capable of capturing images of better quality when performing helical scanning with a scan surface tilted by a cone beam.

SOLUTION: A tilt correction processing is conducted on projection data D0 to correct the variation of a position in every view to a rectilinear moving axis of each channel of a detector array due to tilting of a scan surface, and data D1 projected on a projection plane are acquired from the corrected projection data D0 (R1). Reverse projection pixel data D2 of each pixel composing lines on a reconstruction field are acquired by projecting the data D1 projected on the projection plane in an X-ray transmission direction on each pixel composing a plurality of lines at intervals of plural pixels, parallel to the projection plane on the reconstruction field, and also acquired by interpolating between the lines (R2). The reverse projection pixel data D2 of all views used for image reconstruction are added corresponding to the pixel (R3).

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