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Related Experiment Video

Updated: Mar 2, 2026

Sound Source Localization Testing in Single-sided Deafness Following Bone Conduction Intervention
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WE-G-BRCD-05: Evaluation of Localization Errors for CSA Delivery Using VMAT.

P Myers1,2, S Stathakis1,2, C Esquivel1,2

  • 1Cancer Therapy and Research Center at UT Health Science Center, San Antonio, TX.

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|May 19, 2017
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Summary

Minimizing patient setup errors in VMAT cranio-spinal axis irradiation is crucial. Even small 1-2mm shifts can impact treatment, with larger 5-10mm errors significantly worsening outcomes and dose conformity.

Keywords:
AnatomyLocalization effectsTherapeutics

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Area of Science:

  • Radiation Oncology
  • Medical Physics
  • Radiotherapy Planning

Background:

  • VMAT (Volumetric Modulated Arc Therapy) is a sophisticated radiotherapy technique.
  • Cranio-spinal axis irradiation requires precise patient positioning due to the large treatment volume and critical structures involved.
  • Accurate patient setup is paramount for effective dose delivery and minimizing toxicity.

Purpose of the Study:

  • To dosimetrically evaluate the impact of patient positioning errors at the junction of VMAT arcs used in cranio-spinal axis irradiation.
  • To quantify the effects of specific superior and inferior isocenter shifts on treatment plan quality.

Main Methods:

  • Five patients undergoing VMAT cranio-spinal axis irradiation were retrospectively analyzed.
  • Treatment plans with one superior and one inferior arc were generated.
  • Isocenter positions were artificially shifted superiorly and inferiorly by 1, 2, 5, and 10mm to simulate setup errors.
  • Plans were compared to the original non-shifted plan using conformity number, homogeneity index, and mean doses to organs at risk.

Main Results:

  • Conformity number and homogeneity index were negatively impacted by shifts, with larger deviations observed for superior shifts (up to 5.99% for CN, 15.29% for HI).
  • Mean doses to organs at risk showed less than 2% difference for shifts up to 5mm.
  • Significant deviations (up to 5.6% on average) in mean organ at risk doses were observed for 10mm shifts.

Conclusions:

  • Patient setup errors in VMAT cranio-spinal axis irradiation, particularly at the arc junction, should be minimized.
  • While 1-2mm shifts can affect treatment, larger errors of 5-10mm pose a greater risk to treatment quality and patient safety.
  • Strict adherence to precise patient positioning is essential for optimal VMAT outcomes.