Dose assessment for brachytherapy with Henschke applicator

Yu, Pei-Chieh; Chao, Tsi-Chian; Tung, Chuan–Jong; Wu, Chin-Pyng; Lee, Chung-Chi

doi:10.1016/j.radmeas.2011.06.043

Cited by 2 publications

(1 citation statement)

References 14 publications

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“…Usually the applicator has a metal material covering its outside and might even also contain a metal structure within the ovoid. Henschke applicators have been widely used inpatients with cervical cancer in recent years [8] – [11] , but the dose perturbation caused by such applicators is not currently evaluated in treatment planning system. The European Society for Therapeutic Radiology and Oncology(ESTRO) suggested considering the effects of tissue inhomogeneity and source shielding during treatment planning system [12] .…”

Section: Introductionmentioning

confidence: 99%

Influence of Metal of the Applicator on the Dose Distribution during Brachytherapy

Shiau

Liao

et al. 2014

PLoS ONE

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This study explores how the metal materials of the applicator influence the dose distribution when performing brachytherapy for cervical cancer. A pinpoint ionization chamber, Monte Carlo code MCNPX, and treatment planning system are used to evaluate the dose distribution for a single Ir-192 source positioned in the tandem and ovoid. For dose distribution in water with the presence of the tandem, differences among measurement, MCNPX calculation and treatment planning system results are <5%. For dose distribution in water with the presence of the ovoid, the MCNPX result agrees with the measurement. But the doses calculated from treatment planning system are overestimated by up to a factor of 4. This is due to the shielding effect of the metal materials in the applicator not being considered in the treatment planning system. This result suggests that the treatment planning system should take into account corrections for the metal materials of the applicator in order to improve the accuracy of the radiation dose delivered.

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Section: Introductionmentioning

confidence: 99%