Ultrasound-based image guided radiotherapy for prostate cancer-comparison of cross-modality and intramodality methods for daily localization during external beam radiotherapy

Conclusions: A significant systematic difference exists between cross-modality and intramodality methods when assessing prostate alignment during daily EBRT. Because displacements assessed by IMVM are consistent with those assessed by computed tomography scan, a more accurate prostate alignment appears to be obtained when the IMVM method is used.