Comprehensive target geometric errors and margin assessment in stereotactic partial breast irradiation

Xin Zhen, Bo Zhao, Zhuoyu Wang, Robert Timmerman, Ann Spangler, Nathan Kim, Asal Rahimi, Xuejun Gu

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

Background: Recently developed stereotactic partial breast irradiation (S-PBI) allows delivery of a high biologically potent dose to the target while sparing adjacent critical organs and normal tissue. With S-PBI tumoricidal doses, accurate and precise dose delivery is critical to achieve high treatment quality. This study is to investigate both rigid and non-rigid components of target geometric error and their corresponding margins in S-PBI and identify correlated clinical factors. Methods: Forty-three early-stage breast cancer patients with implanted gold fiducial markers were enrolled in the study. Fiducial positions recorded on the orthogonal kV images on a Cyberknife system during treatment were used to estimate intra-fraction errors and composite errors (including intra-fraction errors and residual errors after patient setup). Both rigid and non-rigid components of intra-fraction and composite errors were analyzed and used to estimate rigid and non-rigid margins, respectively. Univariate and multivariate linear regressions were conducted to evaluate correlations between clinical factors and errors. Results: For the study group, the intra-fraction rigid and non-rigid errors are 2.0±0.6mm and 0.3±0.2mm, respectively. The composite rigid and non-rigid errors are 2.3±0.5mm and 1.3±0.8mm, respectively. The rigid margins in the left-right, anterior-posterior, and superior-inferior directions are estimated as 2.1, 2.4, and 2.3mm, respectively. The estimated non-rigid margin, assumed to be isotropic, is 1.7mm. The outer breast quadrants are more susceptible to composite errors occurrence than the inner breast quadrants. The target to chest wall distance is the clinical factor correlated with target geometric errors. Conclusions: This is the first comprehensive analysis of breast target geometric rigid and non-rigid errors in S-PBI. Upon the estimation, the non-rigid margin is comparable to rigid margin, and therefore should be included in planning target volume as it cannot be accounted for by the Cyberknife system. Treatment margins selection also need to consider the impact of relevant clinical factor.

Original languageEnglish (US)
Article number151
JournalRadiation Oncology
Volume12
Issue number1
DOIs
Publication statusPublished - Sep 11 2017

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Keywords

  • Cyberknife
  • Fiducial
  • Margin
  • Stereotactic partial breast irradiation

ASJC Scopus subject areas

  • Oncology
  • Radiology Nuclear Medicine and imaging

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