In vivo dosimetry of thyroid doses from different irradiated sites in children and adolescents: a cross-sectional studyReport as inadecuate




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Radiation Oncology

, 9:40

Radiation Physics

Abstract

BackgroundScattered radiation can be assessed by in vivo dosimetry. Thyroid tissue is sensitive to radiation, even at doses <10 cGy. This study compared the scattered dose to the thyroid measured by thermoluminescent dosimeters TLDs and the estimated one by treatment planning system TPS.

MethodsDuring radiotherapy to sites other than the thyroid of 16 children and adolescents, seventy-two TLD measurements at the thyroid were compared with TPS estimation.

ResultsThe overall TPS-TLD bias was 1.02 95% LA 0.05 to 21.09. When bias was stratified by treatment field, the TPS overestimated TLD values at doses <1 cGy and underestimated them at doses >10 cGy. The greatest bias was found in pelvis and abdomen: 15.01 95% LA 9.16 to 24.61 and 5.12 95% LA 3.04 to 8.63 respectively. There was good agreement in orbit, head, and spine: bias 1.52 95% LA 0.48 to 4.79, 0.44 95% LA 0.11 to 1.82 and 0.83 0.39 to 1.76 respectively. There was small agreement with broad limits for lung and mediastinum: 1.13 95% LA 0.03 to 40.90 and 0.39 95% LA 0.02 to 7.14 respectively.

ConclusionsThe scattered dose can be measured with TLDs, and TPS algorithms for outside structures should be improved.

KeywordsThyroid gland Thermoluminescent dosimetry Radiotherapy Child Adolescent AbbreviationsTLDsThermoluminescent dosimeters

TPSTreatment planning system

CTComputed tomography

CCCalibration coefficient

BGBackground dose.

Electronic supplementary materialThe online version of this article doi:10.1186-1748-717X-9-40 contains supplementary material, which is available to authorized users.

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Author: Cassiane Cardoso Bonato - Henrique Bregolin Dias - Michele da Silva Alves - Lucas Ost Duarte - Telpo Martins Dias - Mai

Source: https://link.springer.com/







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