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A Novel Evaluation Method for Displacement between Carbon Beam Axis and Positioning X-ray Axis Using an Imaging Plate
Yuji Kurosawa1, Yoshiki Kubota, Eri Takeshita
1Department of Radiology, Gunma University Hospital.
Nihon Hoshasen Gijutsu Gakkai Zasshi
|February 24, 2016
Summary
A new method accurately calculates displacement between carbon and X-ray beams. Weekly variations in beam alignment were found to be within acceptable limits, ensuring treatment precision.
Area of Science:
- Medical Physics
- Radiation Oncology
- Radiotherapy Imaging
Background:
- Accurate alignment of radiation beams is critical for precise dose delivery in cancer therapy.
- Displacement between carbon beam and X-ray positioning axes can affect treatment accuracy.
- Robust evaluation methods are needed to monitor and ensure beam alignment over time.
Purpose of the Study:
- To develop a straightforward method for directly calculating displacement between the carbon beam axis and the X-ray positioning axis.
- To verify the accuracy and reliability of the developed evaluation method.
- To assess weekly variations in beam alignment in clinical practice.
Main Methods:
- Acquired verification images using both carbon beam and X-ray irradiation on an imaging plate.
- Utilized a lead plate in the range compensator holder for X-ray attenuation.
- Calculated displacement by comparing the centers of wires irradiated by carbon and X-ray beams, both collimated by a multi-leaf collimator (MLC).
- Evaluated method accuracy by systematically varying carbon beam axis, X-ray axis, and setup angles.
- Monitored weekly changes in vertical and lateral beam displacements across all treatment rooms.
Main Results:
- The developed method accurately calculated displacement, with results unaffected by carbon beam axis or setup angle variations.
- X-ray axis displacement significantly influenced calculation results (R=0.999).
- All measured displacements, including weekly changes, remained below 1.00 mm, indicating high precision.
- Weekly variations in beam alignment were found to be within acceptable clinical tolerances.
Conclusions:
- A simple and direct evaluation method for carbon and X-ray beam axis displacement has been successfully developed and validated.
- The method provides reliable measurements of beam alignment crucial for radiotherapy.
- Weekly displacement variations at the facility are within acceptable limits, ensuring consistent treatment delivery.
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