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J Korean Soc Ther Radiol Oncol > Volume 20(3); 2002 > Article
The Journal of the Korean Society for Therapeutic Radiology and Oncology 2002;20(3): 274-282.
Transmission Dose Estimation Algorithm for Irregularly Shaped Radiation Field
Hyong Geun Yun, Eui Kyu Chie, Soon Nyung Huh, Hyoung Koo Lee, Hong Gyun Wu, Kyo Chul Shin, Siyong Kim, Sung Whan Ha
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
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.
Key Words: In vivo dosimetry, Algorithm, Transmission dose, Irregular shaped field
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