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Shuttle dose at the Vienna Leksell Gamma Knife
A Ertl1, M Zehetmayer, A Schöggl
1Department of Neurosurgery, University of Vienna, Austria.
Physics in Medicine and Biology
|July 3, 1998
Summary
This study determined the shuttle dose for Gamma Knife radiosurgery, finding it a significant factor for accurate dose planning. Including this additional radiation dose in treatment plans is crucial for fractionated radiotherapy.
Area of Science:
- Medical Physics
- Radiotherapy
- Radiation Oncology
Background:
- Accurate radiation dose delivery is critical in stereotactic radiosurgery.
- Fractionated stereotactic radiotherapy and multicentre treatment regimens require precise dose planning.
Purpose of the Study:
- To determine the shuttle dose for all Gamma Knife (model B) collimator helmets (4, 8, 14, 18 mm).
- To evaluate the necessity of including shuttle dose in radiosurgical dose planning.
Main Methods:
- GafChromic film dosimetry was used to measure shuttle doses for all collimator sizes.
- Ionization chamber and TLD dosimetry were employed to validate film measurements.
Main Results:
- Shuttle doses ranged from 99.6 to 183.5 mGy, varying with collimator size and irradiated isocenters.
- GafChromic film data showed excellent correlation (<0.8% difference) with ionization chamber and TLD measurements.
Conclusions:
- The shuttle dose is a non-negligible factor in Gamma Knife radiotherapy.
- Inclusion of shuttle dose in radiosurgical dose planning is recommended for improved accuracy.