Dosimetric Consequences of Rotational Patient Setup Errors in Stereotactic Radiosurgery
Abstract
The level of rotational patient setup error needed to impact stereotactic radiosurgery (SRS) treatments is not well defined. The purpose of this study was to explore potential rotational setup error thresholds for SRS treatments of brain metastases. The groups analyzed in this study consisted of either single isocentric targets or multiple nonisocentric targets. Rotations between 0.5° and 7° were simulated, and the percent of the target volume that received the prescription dose (Vp) was compared between the original plans and rotation simulations to determine what
degree of rotations would cause notable Vp loss. The results suggest that a rotational patient setup error threshold of 2° around all axes for treatments of single isocentric targets is conservative. For treatments of multiple nonisocentric targets, especially those that are far from the treatment isocenter, the rotational setup error threshold may need to be as low as or lower than 0.5°.
Description
Keywords
Oncology, Radiology, Physics--Radiation
Citation
Briscoe, M. (2016). Dosimetric Consequences of Rotational Patient Setup Errors in Stereotactic Radiosurgery (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/25738