Daily Bone Alignment With Limited Repeat CT Correction Rivals Daily Ultrasound Alignment for Prostate Radiotherapy

Daily bone alignment plus CFID for internal systematic prostate displacement provided better daily alignment precision and equivalent dose coverage compared with daily US alignment. The CFID should be based on at least three repeat CT scans, which could be collected before the start of treatment or during the first 3 treatment days. Daily bone alignment plus CFID provides another option for accurate prostate cancer patient positioning.