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WE-G-BRB-09: CyberKnife Patient Specific QA Using a 4D Cylindrical Diode Array System.

S Koren1, I Veltchev1, J Fan1

  • 1Fox Chase Cancer Center, Philadelphia, PA.

Medical Physics
|May 19, 2017
PubMed
Summary
This summary is machine-generated.

The ArcCheck system is feasible for CyberKnife radiosurgery patient-specific quality assurance. A custom angular correction significantly improved accuracy, achieving a 99.8% passing rate for lung cases.

Keywords:
BrainElectric measurementsGoldLinear acceleratorsLungsMultileaf collimatorsRadiosurgeryRoboticsSpatial dimensions

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Area of Science:

  • Medical Physics
  • Radiation Oncology

Background:

  • CyberKnife robotic radiosurgery requires robust patient-specific quality assurance (QA) for hypofractionated treatments.
  • Small, unflattened CyberKnife fields and varying beam angles present dosimetric challenges for QA systems.

Purpose of the Study:

  • To evaluate the feasibility of the ArcCheck cylindrical diode array for patient-specific QA in CyberKnife radiosurgery.
  • To develop and apply a beam-to-diode specific angular correction for improved accuracy.

Main Methods:

  • Patient-specific QA was performed using the ArcCheck system on the CyberKnife.
  • A custom angular correction was developed and applied, accounting for CyberKnife's unique beam characteristics.
  • Monte Carlo methods were used for dose calculation with 1% uncertainty.

Main Results:

  • Applying the custom CyberKnife correction improved the passing rate from 39.6% to 99.8% for a lung case using 3%/3mm gamma criteria.
  • An additional lung case achieved a 98.5% passing rate.
  • Ongoing investigations include brain, trigeminal nerve, and lung cases with synchrony tracking.

Conclusions:

  • The ArcCheck system is feasible for CyberKnife patient-specific QA.
  • The developed custom angular correction demonstrates high passing rates, particularly for lung cases.
  • Further verification of polar angle response is recommended, complementing existing chamber measurements.