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Investigation of Interfraction Variations of MammoSite Balloon Applicator in High-Dose-Rate Brachytherapy of Partial Breast Irradiation
Journal article   Open access

Investigation of Interfraction Variations of MammoSite Balloon Applicator in High-Dose-Rate Brachytherapy of Partial Breast Irradiation

Yongbok Kim, Mark Johnson, Mark G. Trombetta, David S. Parda and Moyed Miften
International journal of radiation oncology, biology, physics, v 71(1)
2008
DOI: https://doi.org/10.1016/j.ijrobp.2008.01.024
PMID: 18406895
Featured in Collection :   UN Sustainable Development Goals @ Drexel
url
https://doi.org/10.1016/j.ijrobp.2008.01.024View
Published, Version of Record (VoR)Maybe Open Access (Publisher Bronze),  Open

Abstract

High-dose-rate brachytherapy Interfraction changes MammoSite applicator Partial breast irradiation
To measure the interfraction changes of the MammoSite applicator and evaluate their dosimetric effect on target coverage and sparing of organs at risk. A retrospective evaluation of the data from 19 patients who received 10 fractions (34 Gy) of high-dose-rate partial breast irradiation was performed. A computed tomography-based treatment plan was generated for Fraction 1, and a computed tomography scan was acquired just before the delivery of each fraction to ensure a consistent shape of the balloon. The eccentricity, asymmetry, and planning target volume (PTV) for plan evaluation purposes (PTV_EVAL), as well as trapped air gaps, were measured for all patients. Furthermore, 169 computed tomography-based treatment plans were retrospectively generated for Fractions 2–10. Interfraction dosimetric variations were evaluated using the %PTV_EVAL coverage, target dose homogeneity index, target dose conformal index, and maximum doses to the organs at risks. The average variation of eccentricity and asymmetry from Fraction 1 values of 3.5% and 1.1 mm was −0.4% ± 1.6% and −0.1 ± 0.6 mm. The average trapped air gap volume was dramatically reduced from before treatment (3.7 cm 3) to Fraction 1 (0.8 cm 3). The PTV_EVAL volume change was insignificant. The average variation for the %PTV_EVAL, target dose homogeneity, and target dose conformal index from Fraction 1 values of 94.7%, 0.64, and 0.85 was 0.15% ± 2.4%, −0.35 ± 2.4%, and −0.34 ± 4.9%, respectively. The average Fraction 1 maximum skin and ipsilateral lung dose of 3.2 Gy and 2.0 Gy varied by 0.08 ± 0.47 and −0.16 ± 0.29 Gy, respectively. The interfraction variations were patient specific and fraction dependent. Although the average interfraction dose variations for the target and organs at risk were not clinically significant, the maximum variations could be clinically significant.

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15 citations in Web of Science
13 citations in Scopus

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Collaboration types
Domestic collaboration
Web of Science research areas
Oncology
Radiology, Nuclear Medicine & Medical Imaging
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