Comparison of Measured and Calculated Exit Dose for Intracavitary Accelerated Partial Breast Irradiation with an Electronic Brachytherapy Source

Comparison of TG-43 and TG-186 in breast irradiation using a low energy electronic brachytherapy source

“…This simple model was similar to TG-43 but took into account the absence of backscatter from air outside the patient (which contributes to the overestimation of skin dose when using TG-43) (Ref. 27) and low-density lung tissue inside the patient. This would be used to isolate the effect of tissue heterogeneity in regions where nonpatient backscatter (or absence of) would be an important factor in dose differences when comparing to TG-43.…”

Development of a phantom to validate high‐dose‐rate brachytherapy treatment planning systems with heterogeneous algorithms

“…The estimated uncertainties for the experimental setups are in the Tables III-V, for the TLD, EBT3, and A1SL dosimetric systems, respectively. The uncertainties specific to each method were propagated and analyzed using the methodology of DeWerd et al 57 Table III shows the estimated uncertainties for the TLD measurement results, following an equivalent method adopted by Raffi et al 7,13 The linearity corrections realized by the 60 Co source were estimated to be 1.0% considering the fitting uncertainties and absorbed dose determination. The phantom scattering reflects on the uncertainties involved in the scattering conditions and is estimated to be 0.5%.…”

“…The use of these materials in the context of the radiotherapy was previously explored in the literature. [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] Table I lists the material combination and thickness used in each setup. These combinations were selected in order to simulate patient anatomy, such as interfaces of breast-tobone and lung-to-bone-breast, conditions of scattering and backscattering using heterogeneous materials, and effects of boundary of high or low densities compared with water simulator materials.…”

“…As investigated by Nunn et al TLD-100, 27 has intrinsic energy dependence for moderately filtered x-ray (20-250 kVp) beams relative to 60 Ir energy spectra for the intrinsic energy dependence. 13 While our primary interest is the relative response of the dosimeter when heterogeneities are present in the HDR 192 Ir irradiations, it is assumed that the energy spectra change due to the different scattering materials have a minor effect on the dosimeter response. T I.…”

“…All the irradiation procedures were performed using a bronchial catheter (plastic) with 5-French (0.167 cm) diameter, placed in a VW source holder (0.2 cm thick) with a groove machined in one side. 13 A single dwell position was selected in this work, as multiple dwell positions tend to increase the contribution of the 192 Ir transit dose. 43 In order to verify the accuracy of the HDR 192 Ir source for the specific dwell position, preliminary verifications with radiochromic film were performed.…”