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Transmission Dose Estimation Algorithm for Irregularly Shaped Radiation Field  

Yun Hyong Geun (Department of Therapeutic Radiology, Dankook University College of Medicine)
Chie Eui Kyu (Department of Therapeutic Radiology, Seoul National University College of Medicine)
Huh Soon Nyung (Department of Therapeutic Radiology, Seoul National University College of Medicine, Torsion Meditronics)
Wu Hong Gyun (Department of Therapeutic Radiology, Seoul National University College of Medicine, Institute of Radiation Medicine, Medical Research Center, Seoul National University)
Lee Hyoung Koo (Department of Biomedical Engineering, The Catholic University)
Shin Kyo Chul (Department of Therapeutic Radiology, Dankook University College of Medicine)
Kim Siyong (Department of Therapeutic Radiology, Florida University College of Medicine)
Ha Sung Whan (Department of Therapeutic Radiology, Seoul National University College of Medicine, Institute of Radiation Medicine, Medical Research Center, Seoul National University)
Publication Information
Radiation Oncology Journal / v.20, no.3, 2002 , pp. 274-282 More about this Journal
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 ${\pm}1.0\%$, 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.
Keywords
In vivo dosimetry; Algorithm; Transmission dose; Irregular shaped field;
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