Radiation Oncology Journal
- Volume 11 Issue 1
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- Pages.183-191
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- 1993
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- 2234-1900(pISSN)
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- 2234-3156(eISSN)
Homogeneous Dose Planning to Paranasal Sinus with the Partial Attenuation filters and Wedged Beams in 6 MV Photon Beam
6 MV 광자선의 투과성필터와 Wedge 선속을 이용한 부비강의 균등선량계획
- Choi, Tae-Jin (Therapeutic Radiology, School of Medicine, Keimyung University, Dongsan Medical Center) ;
- Lee, Ho-Joon (Therapeutic Radiology, School of Medicine, Keimyung University, Dongsan Medical Center) ;
- Kim, Ok-Bae (Therapeutic Radiology, School of Medicine, Keimyung University, Dongsan Medical Center)
- Published : 1993.06.01
Abstract
The homogeneous dose planning is one of the most important roles in radiation therapy. But, it is not easy to obtain a homogeneous dose to paranasal sinus region including the ethmoidal sinus with conventional irradiation techniques. In this experimental study, the authors tried to get a homogeneous dose at PNS region, but the nasal cartirage does not exceed the tolerance dose, with anterior-posterior beam and two both lateral wedged beams. Used three fields were shielded with full thickness of blocks to preserve the eye-balls and with blocks of one half value layer to create a homogeneous dose at the whole treatment volume. The dose computations are based on the three dimensonal structure with modified scatter contributions of partial shielders and attenuated beams in 6 MV photon beams. The dose distributions of mid-plane is examined with Kodak verification films and teflon-embedded TLD rod (1 mm diameter and 6 mm length) to confirm the computed dose. In our study, the whole PNS regions have shown within