Use of uniform shots for robust planning of mask-based treatment in Gamma Knife Icon

Dershan Luo, Eun Young Han, Zhifei Wen, Dennis S. Mackin, Shane P. Krafft, Jing Li, Xin Wang, Tina M. Briere

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Purpose: To verify whether Icon automatic correction is robust in preserving plan quality. Materials/methods: An end-to-end phantom was used to verify Icon's correction accuracy qualitatively. For quantitative assessment, two plans, a composite- and a uniform-shot-only, were created for an elliptical- (E) and a sausage-shaped (S) lesion inside a PseudoPatient head phantom with a film insert. The phantom was irradiated in the planned and three other positions under each plan: 14° pitch (B); 14° rotation + 8° pitch (C); 95° rotation + 4-cm shift (D). Results: Icon accurately corrects the locations of the shots. For the uniform-shot plans: all gamma index passing rates were >97%, and the differences between the planned and the delivery doses (minimum, maximum, and mean) were all ≤0.1 Gy. For the composite-shot plans, however, the dose differences increased as the phantom was shifted through positions B-D, with a gamma index passing rate of 61% for lesion-E in position D, and 92%, 79%, and 45% for lesion-S in positions B, C, and D, respectively. Conclusions: Plans using only uniform shots are more robust to deviations in treatment position. The tolerance for such deviations may be lower for plans using composite shots.

Original languageEnglish (US)
Pages (from-to)135-157
Number of pages23
JournalPhysica Medica
Volume73
DOIs
StatePublished - May 2020

Keywords

  • Gamma Knife Icon
  • Robust planning
  • Shot correction
  • Uniform and composite shots

ASJC Scopus subject areas

  • Biophysics
  • Radiology Nuclear Medicine and imaging
  • General Physics and Astronomy

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