Analysis of the Influence of Different Scanning Conditions of Medical Electron Accelerator CBCT on Image Quality

Objective To investigate the influence of different scanning conditions on the image quality of medical electron accelerator CBCT and provide reference for the selection of scanning conditions in different parts. Methods On the basis of the standard scanning conditions of different parts, different scanning parameters were set and the Catphan 503 phantom was scanned using CBCT parameters to analyze the influence of spatial resolution, noise, uniformity, spatial geometric accuracy and low-contrast resolution on the image quality of CBCT.

Results For the head, chest and abdomen, the noise value decreased by 47.4%, 26.1% and 51.3%, respectively, with the increase of scanning parameters, and the uniformity value decreased by 30.2%, 26.6% and 47.9%, respectively. The low-contrast resolution value decreased by 13.3%, 20.5% and 12.0%, The influence of different scanning conditions on spatial geometric accuracy and spatial resolution is not significant.

Conclusion Different scanning parameters have certain influence on the image quality of medical electron accelerator CBCT. Patients can be selected to have lower scanning parameters to reduce the additional radiation dose to patients, providing reference for the safe application of CBCT image guidance in radiotherapy.