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Differential dose delivery using a nondocking applicator for intraoperative radiation therapy
1Department of Radiation Oncology, Bodine Center for Cancer Treatment, Thomas Jefferson University Hospital, Philadelphia, PA 19107-5097, USA.
International Journal of Radiation Oncology, Biology, Physics
|January 15, 1997
Summary
A new technique for intraoperative radiation therapy (IORT) allows for a boost dose to a specific tumor area. This method uses custom brass cones with existing IORT systems to improve targeted radiation delivery.
Area of Science:
- Radiation Oncology
- Medical Physics
- Surgical Oncology
Background:
- Delivering a boost dose to a localized area during intraoperative radiation therapy (IORT) is challenging.
- Existing techniques for boost doses are common in external beam therapy but less so in electron beam or IORT.
Purpose of the Study:
- To introduce and detail a novel technique for treating a "field within a field" during IORT.
- To enable differential dose delivery for enhanced tumor targeting in IORT.
Main Methods:
- Utilized a non-docking IORT system with a two-segment treatment approach.
- Employed standard lucite cones for the initial large field treatment.
- Introduced a new, concentrically fitting brass cone for delivering the boost dose to the smaller, targeted field.
Main Results:
- Characterized beam parameters including central axis depth dose, surface dose, output factors, and beam profiles.
- Measured these parameters for electron beam energies from 4-22 MeV.
- Presented summed dose distributions, weighted for energy and dose, for various clinical target volumes.
Conclusions:
- A straightforward technique for achieving differential dose delivery in IORT has been developed.
- This method facilitates dose escalation to specific target volumes within the treatment area.
- The technique enhances precision in IORT for improved clinical outcomes.