Evaluation of Dose Accuracy in the Near-Surface Region for Whole Breast Irradiation Techniques in a Multi-institutional Consortium

Moncion, Alexander; Wilson, Margo; Ma, Ruimei; Marsh, Robin; Burmeister, Jay; Dryden, Daniel; Lack, Danielle; Grubb, Maria C. Mejia de; Mayville, Alan; Jursinic, Paul A.; Dess, Kathryn; Kamp, Justin D.; Young, K.C.; Dilworth, J.T.; Kestin, Larry L.; Jagsi, Reshma; Mietzel, Melissa A.; Vicini, Frank A.; Pierce, Lori J.; Moran, Jean M.

doi:10.1016/j.prro.2022.01.013

Cited by 3 publications

(2 citation statements)

References 38 publications

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“…The findings indicate that there were no significant differences between the mean of calculated and measured dose values for all TPSs. 31 Howell et al 32 investigated the dose calculation accuracy of Eclipse TPS for locations outside the treatment field. They reported that the TPS underestimated out-of-field dose values by an average of 40% as compared with measured doses.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, the differences between the dose measurements and the dose calculations ranged from 10 to 40% for the regions outside the treatment field. 29 Moncion et al 31 evaluated the dose calculation accuracy of different TPSs in the near-surface region for patients receiving whole breast irradiation. Of note, the dose values were measured with radiochromic film placed at 5 mm and 10 mm depth and three locations per depth within the phantom.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of dose calculation accuracy of a commercial radiotherapy treatment planning system for adjacent radiation fields

et al. 2023

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Background: Adjacent radiation fields are applied in some radiotherapeutic cases. When using these radiation fields, considerable dose errors across the junction of radiation fields are possible. Therefore, it is necessary to evaluate the accuracy of the dose calculated by treatment planning system (TPS) when using the adjacent radiation fields. The present study aimed to quantify the dose calculation accuracy of ISOgray TPS for the photon-photon adjacent fields. Materials and methods: To assess the accuracy of dose calculations, the dose profiles were first measured by a Semiflex ionization chamber at 1, 1·5, 5 and 10 cm depths for different field sizes (6 × 6, 10 × 10 and 20 × 20 cm2), source to surface distances (SSDs) (90, 100 and 110 cm) and beam angles (0º, 15º, 30º and 45º). In the second step, the data at corresponding depths were extracted from the ISOgray TPS. Finally, the dosimetric performance of TPS was evaluated using a gamma index analysis. Results: The overall dose calculation accuracy of ISOgray TPS was within the acceptable range for the build-up region (with acceptance criteria of dose difference (DD) = 15% and distance to agreement (DTA) = 3 mm) and the depths after the build-up region (with acceptance criteria of DD = 5% and DTA = 3 mm). Moreover, the overall accuracy of dose calculations was not affected by the field size and the SSD. It was also shown that the accuracy of dose calculations was similar for the adjacent radiation fields with beam angles of 0º, 15 º and 30 º, while a considerable decrease in the pass rate values is obtained for the adjacent radiation field with 45 º beam angle. A more detailed analysis of the findings revealed that the accuracy of dose calculations in the match line regions of the adjacent radiation fields for 1 cm beam profiles was within the acceptable range; however, it declined for other depths. Conclusions: The findings showed that the overall dose calculation accuracy of ISOgray TPS was acceptable for evaluated adjacent radiation fields. However, the accuracy of dose calculations in the match line regions of the adjacent radiation fields for the depth after build-up was not within the acceptable range.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation of dose calculation accuracy of a commercial radiotherapy treatment planning system for adjacent radiation fields

et al. 2023

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Investigation of skin dose of post-mastectomy radiation therapy for the halcyon and tomotherapy treatment machine: Comparison of calculation and in vivo measurements

Demir,

Gul,

Aksu

2024

Radiation Measurements

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Estimation of the Surface Dose in Breast Irradiation by the Beam Incident Angle and the 1 cm Depth Dose

Yen

Chuang

et al. 2022

JCM

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To develop a method of estimating surface dose in whole breast irradiation, we used an anthropomorphic phantom with accessories for the simulation of different breast sizes. The surface points, which are measured by TLDs, are set along with two main directions, superior-inferior and medial-lateral. The incident angle between the photon beam and the surface and the doses at 1 cm beneath the surface at every point are assessed by a computerized treatment planning system (cTPS). With the prescription dose of 200 cGy, the average surface doses under tangential irradiation are 97.73 (±14.96) cGy, 99.90 (±10.73) cGy, and 105.26 (±9.21) cGy for large, medium, and small breast volumes, respectively. The surface dose increased in the model of small breast volume without significance (p = 0.39). The linear analysis between surface dose and the incident angle is y = 0.5258x + 69.648, R2 = 0.7131 (x: incident angle and y: surface dose). We develop the percentage of skin surface dose with reference to a depth of 1 cm (PSDR1cm) to normalize the inhomogeneous dose. The relationship between incident angle and PSDR1cm is y = 0.1894x + 36.021, R2 = 0.6536 (x: incident angle and y: PSDR1cm) by linear analysis. In conclusion, the surface dose in whole breast irradiation could be estimated from this linear relationship between PSDR1cm and incident angle in daily clinical practice by cTPS. Further in vivo data should be studied to verify this formula.

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Evaluation of Dose Accuracy in the Near-Surface Region for Whole Breast Irradiation Techniques in a Multi-institutional Consortium

Cited by 3 publications

References 38 publications

Evaluation of dose calculation accuracy of a commercial radiotherapy treatment planning system for adjacent radiation fields

Evaluation of dose calculation accuracy of a commercial radiotherapy treatment planning system for adjacent radiation fields

Investigation of skin dose of post-mastectomy radiation therapy for the halcyon and tomotherapy treatment machine: Comparison of calculation and in vivo measurements

Estimation of the Surface Dose in Breast Irradiation by the Beam Incident Angle and the 1 cm Depth Dose

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