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J Korean Soc Ther Radiol > Volume 11(1); 1993 > Article
Journal of the Korean Society for Therapeutic Radiology 1993;11(1): 183-191.
Homogeneous Dose Planning to Paranasal Sinus with the Partial Attenuation filters and Wedged Beams in 6 MV Photon Beam
Tae Jin Choi, Ho Joon Lee, Ok Bae Kim
Therapeutic Radiology, School of Medicine, Keimyung University, Dongsan Medial Center, Taegu, Korea.
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 (1mm diameter and 6mm length) to confirm the computed dose. In our study, the whole PNS regions have shown within 85% of the resultant isodose cuties with relatively homogeneous dose distribution. The results of dose computation and measurements are agree well within 5% uncertainties.
Key Words: Partial Filter, Homogeneous Dose
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