Patent ID: 11864941
Assignee: GE PRECISION HEALTHCARE LLC
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 7:
8. A method for verifying aperture positions of a pre-patient collimator of a computed tomography (CT) imaging system comprising an X-ray source and a radiation detector, comprising the acts of:
acquiring air scan data by causing X-rays to be emitted from the X-ray source toward the radiation detector with the pre-patient collimator at different expected aperture positions;
calculating respective widths of respective normalized intensity distribution profiles for the pre-patient collimator at the different expected aperture positions based on the obtained air scan data;
converting the respective widths to respective doses utilizing a transfer function;
determining a respective dose error estimate at the different expected aperture positions based on the respective doses;
comparing the respective dose error estimates to respective dose tolerance thresholds for the different expected aperture positions; and
generating an output based on the comparison of the respective dose error estimates to the respective dose tolerance thresholds.