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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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CyberKnife® fixed cone and Iris™ defined small radiation fields: Assessment with a high-resolution solid-state

Giordano Biasi1, Marco Petasecca1, Susanna Guatelli1

  • 1Centre for Medical Radiation Physics, University of Wollongong, Wollongong, 2522 NSW, Australia.

Journal of Applied Clinical Medical Physics
|July 13, 2018
PubMed
Summary

The Octa silicon array detector accurately measures radiation doses for CyberKnife stereotactic radiotherapy, verifying output factors and dose profiles for small, unflattened beams. This ensures reliable quality assurance for advanced cancer treatments.

Keywords:
SRT2D monolithic silicon array detectorCyberKnifequality assurancesmall-field dosimetry

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Radiotherapy Dosimetry

Background:

  • Stereotactic radiotherapy (SRT) requires precise dosimetry, especially with small, unflattened radiation fields.
  • The CyberKnife system offers submillimeter accuracy, utilizing fixed cones or a dynamic Iris™ collimator.
  • Verifying the reproducibility of output factors (OFs) and dose profiles (DPs) for the Iris collimator is crucial.

Purpose of the Study:

  • To evaluate the Octa, a 2D monolithic silicon array detector, for dosimetric quality assurance (QA) on a CyberKnife system.
  • To assess the accuracy of the Octa in measuring OFs, DPs, percentage depth-dose (PDD), and tissue maximum ratio (TMR).
  • To benchmark Octa measurements against a PTW SRS diode and Monte Carlo (MC) simulations.

Main Methods:

  • The Octa detector was used to measure OFs, DPs, PDDs, and TMRs for a 6 MV FFF beam on a CyberKnife system.
  • Simultaneous measurement of cross-plane, in-plane, and diagonal dose profiles with 0.3 mm spatial resolution.
  • Comparison of Octa measurements with a PTW SRS diode and GEANT4-based MC simulations.

Main Results:

  • The Octa detector demonstrated accuracy within 3% for OFs, PDDs, TMRs, and FWHM of DPs across field sizes from 5 to 60 mm.
  • Measurements were consistent when compared to the SRS diode and MC calculations.
  • The detector provided accurate dosimetry for both fixed cones and the Iris collimator.

Conclusions:

  • The Octa is a suitable and accurate dosimeter for 6 MV FFF beams delivered by a CyberKnife system.
  • It enables real-time dosimetric verification for the dynamic Iris collimator.
  • The Octa's performance is consistent with established dosimetry methods, supporting its use in clinical QA.