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KMID : 1164220070190010051
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Journal of Korean Society for Radiotherapeutic Technology
2007 Volume.19 No. 1 p.51 ~ p.54
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Analysis of Surface Dose Refer to Distance between Beam Spoiler and Patient in Total Body Irradiation
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Choi Jong-Hwan
Kim Jong-Sik
Choi Ji-Min
Shin Eun-Hyuk
Song Ki-Won
Park Young-Hwan
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Abstract
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Purpose: Total body irradiation is used to kill the total malignant cell and for immunosuppression component of preparatory regimens for bone-marrow restitution of patients. Beam spoiler is used to increase the dose to the superficial tissues. This paper finds the property of the distance between beam spoiler and patient.
Materials and Methods: Set-up conditions are 6 MV-Xray, 300 MU, SAD = 400 cm, field size = . The parallel plate chamber located in surface, midpoint and exit of solid water phantom. The surface dose is measured while the distance between beam spoiler and patient is altered. Because it should be found proper distance. The solid water phantom is fixer and beam spoiler is moving.
Results: Central dose of phantom is 10.7 cGy and exit dose is 6.7 cGy. In case of distance of 50 cm to 60 cm between beam spoiler and solid water phantom, incidence dose is . Therefore, The surface dose was measured with got near most to the prescription dose.
Conclusion: In clinical case, distance between beam spoiler and patient affect surface dose. If once of distance between beam spoiler and patient, surface dose of patient got near prescription dose. It would be taken distance between beam spoiler and patient into account in clinical therapy.
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KEYWORD
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total body irradiation, beam spoiler, distance between beam spoiler and patient, surface dose
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