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KMID : 1164220000120010112
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Journal of Korean Society for Radiotherapeutic Technology
2000 Volume.12 No. 1 p.112 ~ p.116
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Evaluation of dose variation at the vertex during Total Skin Electron Beam
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Jeon Byong-Chul
Ahn Seung-Kwon
Lee Sang-Kyu
Kim Joo-Ho
Cho Jeong-Hee
Park Jae-Il
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Abstract
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Purpose : The vertex scalp is always tangentially irradiated during total skin electron beam(TSEB) This study was discuss to the dose distribution at the vertex scalp and to evaluate the use of an electron reflector. positioned above the head as a means of improving the dose uniformity.
Methods and Materials : Vetex dosimetry was performed using ion-chamber and TLD. Measurements were 6 MeV electron beam obtained by placing an acrylic beam speller in the beam line. Studies were performed to investigate the effect of electron scattering on vertex dose when a lead reflector in area, was positioned above the phantom.
Results : The surface dose at the vertex, in the without of the reflector was found to be less than of the skin dose. Use of the lead reflector increased this value to for the 6 MeV beam.
Conclusion : The vertex may be significantly under-dosed using standard techniques for total skin electron beam. Use of an electron reflector improves the dose uniformity at the vertex and may reduce or eliminate the need for supplemental irradiation.
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