Comparison of surface matching and target matching for image-guided pelvic radiation therapy for both supine and prone patient positions.

Comparison of surface matching and target matching for image-guided pelvic radiation therapy for both supine and prone patient positions. J Appl Clin Med Phys. 2016;17(3):5611 Authors: Zhao H, Wang B, Sarkar V, Rassiah-Szegedi P, Huang YJ, Szegedi M, Huang L, Gonzalez V, Salter B Abstract We investigate the difference between surface matching and target matching for pelvic radiation image guidance. The uniqueness of our study is that all patients have multiple CT-on-rails (CTOR) scans to compare to corresponding AlignRT images. Ten patients receiving pelvic radiation were enrolled in this study. Two simulation CT scans were performed in supine and prone positions for each patient. Body surface contours were generated in treatment planning system and exported to AlignRT to serve as reference images. During treatment day, the patient was aligned to treatment isocenter with room lasers, and then scanned with both CTOR and AlignRT. Image-guidance shifts were calculated for both modalities by com-parison to the simulation CT and the differences between them were analyzed for both supine and prone positions, respectively. These procedures were performed for each patient once per week for five weeks. The difference of patient displace-ment between AlignRT and CTOR was analyzed. For supine position, five patients had an average difference of displacement between AlignRT and CTOR along any direction (vertical, longitudinal, and lateral) great...
Source: Journal of Applied Clinical Medical Physics - Category: Physics Authors: Tags: J Appl Clin Med Phys Source Type: research