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Related Experiment Video

Updated: Mar 2, 2026

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SU-E-T-420: Development of a Comprehensive Linac-Based Quality Assurance Procedure for Retrofitted Micro-MLC SRS

G Hancock1, D Pearson1

  • 1University of Toledo, Toledo, OH.

Medical Physics
|May 19, 2017
PubMed
Summary

A new phantom with localization wires accurately and efficiently verifies isocenter accuracy for linac-based stereotactic radiosurgery (SRS) quality assurance (QA). This tool meets the 1mm tolerance required by TG 142 standards.

Keywords:
CamerasLinear acceleratorsQuality assuranceRadiosurgery

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Quality Assurance

Background:

  • Stereotactic radiosurgery (SRS) requires precise isocenter localization for accurate radiation delivery.
  • Quality assurance (QA) protocols, such as TG 142, mandate stringent accuracy tolerances for SRS systems.
  • Existing QA methods may require refinement for newly retrofitted linear accelerators (linacs).

Purpose of the Study:

  • To develop and validate a novel QA tool and methodology for assessing isocenter localization accuracy.
  • To evaluate the performance of a 3DLine camera localization system integrated with an Elekta SL 25 Linear Accelerator retrofitted with a 3DLine Micro-MLC gantry attachment.
  • To ensure isocenter accuracy within 1mm, adhering to established QA guidelines.

Main Methods:

  • A custom phantom was designed with metallic wires intersecting at the isocenter and extending to the cube's faces.
  • The phantom was aligned using imported isocenter coordinates from the ERGO++ Treatment Planning System (TPS).
  • Gafchromic films were irradiated on each side at various gantry and couch angles, with analysis using RIT113 software and 50% isodose curves.

Main Results:

  • Preliminary results indicated deviations of 0.72mm (x) and -1.25mm (y) at a 90° gantry angle.
  • Deviations of -1.27mm (x) and -2.35mm (y) were measured at a 270° gantry angle.
  • Further irradiations and analyses are ongoing, with results to be presented at the AAPM national conference.

Conclusions:

  • The developed phantom and methodology provide an accurate and efficient means for QA of linac-based SRS systems.
  • The QA tool successfully assesses isocenter location accuracy within the required tolerances.
  • This approach enhances the reliability of SRS delivery by ensuring precise targeting.