Derivation of in vivo source tracking error thresholds for TRUS-based HDR prostate brachytherapy through simulation of source positioning errors

Joel Poder, Mauro Carrara, Andrew Howie, Dean Cutajar, Joseph Bucci, Anatoly Rosenfeld

Research output: Contribution to journalArticlepeer-review

Abstract

Purpose: The purpose of this study was to simulate treatment planning source positioning errors in transrectal ultrasound–based real-time high-dose-rate prostate brachytherapy treatments and determine appropriate in vivo source tracking error thresholds. Methods and Materials: Treatment planning source positioning errors were simulated for 20 patient plans in the brachytherapy treatment planning system by manually adjusting the dwell position coordinates within selected catheters without plan reoptimization. The change in dose-volume histogram (DVH) indices was calculated as a function of the source positioning error. The magnitude of the change in the DVH indices was then used to derive appropriate in vivo source tracking error thresholds. Results: Source positioning error thresholds to prevent potentially significant changes in prostate (target) DVH metrics ranged from 2 to 5 mm, dependent on the direction of the source positioning error, as well as the relative weight of the dwell position within the plan, and its position relative to the patient anatomy. Source positioning error thresholds to prevent potentially clinically significant changes in organ at risk DVH metrics were found to be complex and patient-dependent. Conclusions: In vivo source tracking error thresholds for transrectal ultrasound–based real-time high-dose-rate prostate brachytherapy were investigated via the simulation of treatment planning source positioning errors. These error thresholds were found to be dependent not only on the direction of the error, but also on the endpoint. There is still the potential for larger changes in DVH indices to occur for catheter shifts smaller than the proposed threshold levels in this study.

Original languageEnglish
Pages (from-to)711-719
Number of pages9
JournalBrachytherapy
Volume18
Issue number5
DOIs
Publication statusPublished - Sep 1 2019

Keywords

  • Error thresholds
  • In vivo source tracking
  • Prostate brachytherapy
  • TRUS HDR

ASJC Scopus subject areas

  • Oncology
  • Radiology Nuclear Medicine and imaging

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