J Korean Soc Ther Radiol Oncol.
2002 Sep;20(3):274-282.
Transmission Dose Estimation Algorithm for Irregularly Shaped Radiation Field
- Affiliations
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- 1Department of Therapeutic Radiology, Dankook University College of Medicine, Korea.
- 2Department of Therapeutic Radiology, Seoul National University College of Medicine, Korea. swha@snu.ac.kr
- 3Institute of Radiation Medicine, Medical Research Center, Seoul National University, Korea.
- 4Torsion Meditronics, Department of Biomedical Engineering, The Catholic University of Korea, College of Medicine, Seoul, Korea.
- 5Department of Therapeutic Radiology, Florida University College of Medicine, USA.
Abstract
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PURPOSE: Measurement of transmission dose is useful for in vivo dosimetry. In this study, the algorithm for estimating the transmission dose for open radiation fields was modified for application to partially blocked radiation fields.
MATERIALS AND METHODS
The beam data was measured with a flat solid phantom with various blocked fields. A new correction algorithm for partially blocked radiation field was developed from the measured data. This algorithm was tested in some settings simulating clinical treatment with an irregular field shape.
RESULTS
The correction algorithm for the beam block could accurately reflect the effect of the beam block, with an error within +/-1.0%, with both square fields and irregularly shaped fields.
CONCLUSION
This algorithm can accurately estimate the transmission dose in most radiation treatment settings, including irregularly shaped field.
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