Investigation of in vivo source tracking error thresholds for interstitial and intra-cavitary high-dose-rate cervical brachytherapy.

Determining the dosimetric impact of dwell position displacement provides a clinical benchmark for the development of pre-treatment verification devices and an action level for real-time treatment monitoring. It was established that an source tracking error threshold needs to be patient-specific. source tracking error thresholds should be determined for each patient, and can be conducted with extension of the method established in this work.