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Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator
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SU-E-T-176: Improved Collimator Scattering Factor (Sc) Measurements for Small Fields Using Build-Up Caps in Robotic

S Lee1, C Tien1, B Curran1

  • 1Rhode Island Hospital/Brown Medical Center, Providence, RI.

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

Build-up caps significantly impact in-air measurements for small fields in CyberKnife radiosurgery. Careful selection is crucial for commissioning data, especially for fields under 10 mm.

Keywords:
CollimatorsMedical treatment planningMonte Carlo algorithmsRadiosurgeryRoboticsScattering measurementsSelected area electron diffraction

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Area of Science:

  • Medical Physics
  • Radiotherapy
  • Radiation Dosimetry

Background:

  • CyberKnife robotic radiosurgery utilizes Monte Carlo calculations for treatment planning.
  • In-air measurements are essential for the Monte Carlo algorithm's accuracy.
  • The impact of build-up caps on these measurements, particularly for small fields, requires investigation.

Purpose of the Study:

  • To compare the effect of different build-up cap thicknesses on in-air measurements using a diode detector.
  • To evaluate the impact of build-up caps on Sc factors for small fields in CyberKnife radiosurgery.

Main Methods:

  • Two custom-made acrylic build-up caps (1.5 cm and 5 cm) were used with an SFD diode detector.
  • Measurements were performed in air at 80 cm SAD using a Blue Phantom.
  • Comparisons were made across 12 fixed cones ranging from 5 mm to 60 mm.

Main Results:

  • Significant differences (up to 20%) in Sc factors were observed for small fields (5-7.5 mm) with build-up caps compared to free-in-air measurements.
  • Agreement within 2% was not achieved until cone sizes exceeded 40 mm.
  • Observed differences were attributed to electron contamination, with both caps yielding similar Sc factors.

Conclusions:

  • Build-up caps significantly affect Sc factors in small fields, a factor not explicitly addressed in CyberKnife planning manuals.
  • The choice of build-up caps is critical for accurate commissioning data, especially for fields smaller than 10 mm.
  • Further research into build-up cap selection for small field dosimetry is warranted.