Prostate Motion During IMRT Treatment
Author Information
Author(s): Judit Boda-Heggemann, Frederick Marc Köhler, Hansjörg Wertz, Michael Ehmann, Brigitte Hermann, Nadja Riesenacker, Beate Küpper, Frank Lohr, Frederik Wenz
Primary Institution: Department of Radiation Oncology, University Medical Center Mannheim
Hypothesis
What is the magnitude of intrafraction motion of the prostate during an IMRT session?
Conclusion
The overall displacement vector length during an IMRT session is less than 3 mm.
Supporting Evidence
- The median overall displacement vector length of 125I-seeds was 3 mm.
- Median displacement vector of bony structures was 1.84 mm.
- Median displacement vector length of the prostate relative to bony structures was 1.9 mm.
Takeaway
During prostate cancer treatment, the prostate moves a little, but not too much, which helps doctors aim the radiation better.
Methodology
39 IMRT fractions in 5 prostate cancer patients were evaluated using pre- and post-treatment CBCT imaging.
Limitations
The study did not assess spurious, reversible movements of the prostate during beam-on-time.
Participant Demographics
5 patients with intermediate risk prostate cancer.
Digital Object Identifier (DOI)
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