X-ray CT apparatus and image reconstruction method

摘要

In order to execute a high-resolution reconstructible distance-driven back projection process and to generate a high-resolution tomographic image, an X-ray CT apparatus 1 determines the presence/absence of opposing data corresponding to each piece of target data on the basis of scanning conditions, and calculates a phase range where opposing data is present (Step 21). The X-ray CT apparatus 1 performs high-resolution conversion of a zero-insertion method on a phase range where opposing data is present, and performs high-resolution conversion using a data interpolation method on a phase range where no opposing data is present, thereby creating double sampled high-resolution projection data, and calculates a view weight (Step 22). The X-ray CT apparatus 1 performs a distance-driven high-resolution back projection process using high-resolution projection data and generates a reconstructed image (Step 23).

主权项

1. An X-ray CT apparatus which performs image reconstruction on the basis of parallel beam data obtained by fan-parallel conversion on fan beam data, the X-ray CT apparatus comprising:
a determination unit which sets parallel beam data having a phase to be processed as target data, sets parallel beam data having a phase opposing target data as opposing data, and determines the presence/absence of opposing data corresponding to target data; and an image reconstruction unit which performs different high-resolution reconstruction depending on the determination result of the determination unit, executes a back projection process on the basis of the distance between a pixel boundary and a beam boundary using target data or target data and opposing data, and performs image reconstruction.