| Title: |
Intra- and interfractional movements of the BeamCath urethral catheter for image-guided radiotherapy of prostate cancer |
| Authors: |
Henriette B. Honoré1, Per R. Poulsen1, and Morten Høyer2
Radiation treatment of prostate cancer is characterized by the
necessity of a very high dose to the PTV region and a narrow margin
to one of the risk organs, the rectum. A high geometrical precision is
therefore needed. Both the prostate and the rectum have a large
mobility. Daily patient positioning based on the location of the
prostate itself can contribute to a significant margin reduction. Image
guided prostate localization can be obtained by the BeamCath
urethral catheter, which contains radiopaque fiducials for prostate
visualization.
In order to determine an appropriate CTV to PTV margin the position
of the catheter relative to the bony anatomy and linac isocentre was
investigated for repeated BeamCath sessions.
Methods and Material
Results
Conclusions
In the AP direction, which is most critical with regard to rectum
sparing, the BeamCath technique allows a narrowing of the CTV to
PTV margin. However, the technique seems to suffer from instabilities
in the direction of the urethra. Further insight can be obtained from an
analysis of the repeated CT scans where prostate and catheter
movement can be separated (submitted for publication).
1 Department of Medical Physics and 2 Department of Oncology, Aarhus University Hospital,
Denmark |
| Presenter: |
Honoré Henriette B. - Contact |
| Category: |
Genito Urinary |
| Language: |
English |
| Download link: |
View this poster |
| Date of Validation: |
2007-12-25 |
