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KMID : 1164220110230020091
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Journal of Korean Society for Radiotherapeutic Technology
2011 Volume.23 No. 2 p.91 ~ p.96
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Study on Dosimetry Used TLD Dosimeter and Body Mass Index at Total Body Irradiation
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Seo Dong-Rin
Kim Yeon-Soo
Kim Dae-Sup
Yoon Hwa-Ryong
Back Geum-Mun
Kwak Jung-Won
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Abstract
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Purpose: The aim of study is to expose a more uniform dose depending on the relationship between a body mass index in patients who underwent radiation therapy and an acquired dosimetric information by using a thermoluminescent dosimeter.
Materials and Methods: Since 2006 to August 2011 we investigated 28 people who underwent radiation therapy were enrolled in AMC. Each patient was measured on the head, neck, chest, abdomen, pelvis, thigh, knee joint, and ankle joint using the thermoluminescent dosimeter. The measurement value of each points compared with the prescribed center point, abdominal point, and dose measurements of points on which to base the abdomen and the patient’s body mass index (BMI) were compared with reference point, abdomen dose.
Results: 28 patients on prescribed dose in the abdomen by which the center point, an average dose was 100.6±5.5%, and the other seven measuring points with the average maximum difference among the head, neck, chest, pelvic, thigh, knee, and ankle were 92.8±4.2%,97.6±6.2%, 96.4±5.5%, 102.6±5.3%, 103.4±7.9%, 95.8±5.9%, 96.1±5.5%. The relationship of abdominal point dose and the patient’s body mass index (BMI) was analyzed a scatter plot, and the result of linear relationship analysis by regression method, the regression of the dose (y) was -1.009 BMI (x) plus 123.3 and coefficient of determination (R²) was represented 0.697.
Conclusion: The total body irradiation treatment process was evaluated the dose deviation and then the prescribed dose by which the average abdominal dose was satisfied with 100.6±5.5%. Results of the relationship analysis between BMI and dose, if we apply the correction value for each patients, it can be achieved more uniform dose delivery.
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KEYWORD
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total body irradiation, TLD dosimeter, dosimetry
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