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KMID : 0362919940120020233
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Journal of the Korean Society for Therapeutic Radiology and Oncology
1994 Volume.12 No. 2 p.233 ~ p.241
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Utilization of Tissue Compensator for Uniform Dose Distribution in Total Body Irradiation
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Park Seung-Jin
Chung Woong-Ki
Ahn Sung-Ja
Nam Taek-Keun
Nah Byung-Sik
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Abstract
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Purpose: This study was performed to verify dose distribution with the tissue compensator which is used for uniform dose distribution in total body irradiation (TBI).
Materials and Methods: The compensators were made of lead (0.8mm thickness) and aluminum(1mm or 5mm thickness) plates. The humanoid phantom of adult size was made of paraffin as a real treatment position for bilateral total body technique. The humanoid phantom was set at 360cm of source-axis distance(SAD) and irradiated with geographical field size(FS) 144cm ´ 144cm²(40´40 cm² at SAD 100cm) which covered the entire phantom. Irradiation was done with 10MV X-ray(CLINAC 1800, Varian Co., USA) of linear accelerator set at Department of Therapeutic Radiology, Chonnam University Hospital. The midline absorbed dose was checked at the various regions such as head, mouth, mid-neck, sternal notch, mid-mediastinum, xiphoid, umbilicus, pelvis, knee and ankle with or without compensator, respectively. We used exposure/exposure rate meter (model 192, Capintec Inc., USA) with ionization chamber(PR 05) for dosimetry. For the dosimetry of thorax region TLD rods of lxlx6mm³in volume(LiF, Harshaw Co., Netherland) was used at the commercially available humanoid phantom.
Results: The absorbed dose of each point without tissue compensator revealed significant difference(from –11.8% to 21.1%) compared with the umbilicus dose which is a dose prescription point in TBI. The absorbed dose without compensator at sternal notch including shoulder was 11.8% less than the dose of umbilicus. With lead compensator the absorbed doses ranged form +1.3% to –5.3% except midneck which revealed over-compensation (-7.9%). In case of aluminum compensator the absorbed doses were measured with less difference (from –2.6% to 5.3%) compared with umbilicus dose.
Conclusion: Both of lead and aluminum compensators applied to the skull or lower leg revealed a good compensation effect. It was recognized that boost irradiation or choosing reference point of dose prescription at sternal notch according to the lateral thickness of patient in TBI should be considered.
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KEYWORD
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Total body irradiation, Compensator, Dose distribution
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