METHOD FOR SCANOGRAM SCANS IN PHOTON-COUNTING COMPUTED TOMOGRAPHY

摘要

A computed tomography (CT) imaging apparatus for performing a scanogram includes a radiation source to emit X-rays; a plurality of photon-counting detectors (PCDs) arranged in a circular ring between the radiation source and a CT detector; and processing circuitry to perform a first scan to obtain projection data; determine a plurality of dark channels by comparing the obtained projection data to a predetermined threshold; add at least one adjacent padding channel to the determined plurality of dark channels to determine a plurality of shadowed channels; generate a correction map from the determined plurality of shadowed channels; and correct a scanogram obtained by a second scan based on the generated correction map. The apparatus reduces the shadow effects in the scanogram scan.

主权项

1. A computed tomography (CT) imaging apparatus, comprising:
a radiation source configured to emit X-rays; a plurality of photon-counting detectors (PCDs) arranged in a circular ring between the radiation source and a CT detector; and processing circuitry configured to
perform a first scan to obtain first projection data;determine a plurality of dark channels by comparing the obtained projection data to a predetermined threshold;add at least one adjacent padding channel to the determined plurality of dark channels to determine a plurality of shadowed channels;generate a correction map from the determined plurality of shadowed channels; andcorrect a scanogram obtained by a second scan based on the generated correction map.