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Design, testing and characterization of a proton central axis alignment device for the dynamic collimation system.

Theodore Geoghegan1, Kaustubh Patwardhan1, Qi Ying1

  • 1Department of Radiation Oncology, University of Iowa Hospitals and Clinics, 200 Hawkins Drive, Iowa City, IA, 52242, United States of America.

Biomedical Physics & Engineering Express
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PubMed
Summary

A new Central Axis Alignment Device (CAAD) accurately aligns proton therapy

Keywords:
alignmentcameracollimationproton therapyscintillatorspot scanning

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Particle Therapy

Background:

  • Proton therapy advancements utilize smaller beam spot sizes for improved dose conformity.
  • Ancillary devices like the Dynamic Collimation System (DCS) enhance conformity by sharpening the penumbra.
  • Accurate alignment of collimators to the proton beam is critical due to reduced spot sizes.

Purpose of the Study:

  • To develop and validate a system for precise alignment of the Dynamic Collimation System (DCS) with the proton beam central axis.
  • To establish accurate coincidence verification between the DCS and the proton beam radiation field.

Main Methods:

  • Development of the Central Axis Alignment Device (CAAD) using a camera and scintillating screen.
  • Utilizing a 12.3-megapixel camera and P43/Gadox screen within a light-tight box for beam characterization.
  • Acquiring a 7-second exposure of a 7x7 cm2 scanned field across the DCS trimmer and scintillator to calculate alignment offsets.

Main Results:

  • The CAAD achieves an accuracy of 0.054 mm for calculating the offset between the proton beam and DCS central axes.
  • The system demonstrates a reproducibility of 0.075 mm in alignment verification.
  • This method eliminates the need for gantry-based X-ray alignment, which has a lower accuracy (1.0 mm).

Conclusions:

  • The CAAD enables accurate alignment of the DCS to the proton beam central axis.
  • This system significantly improves the precision of proton therapy delivery.
  • The CAAD offers a more accurate and reliable method for collimator alignment compared to previous techniques.