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Optimizing Gantry Breakpoint Angles in Proton Therapy: Enhancing Efficiency and Patient Experience.

Xueyan Tang¹, Amanda J Deisher¹, Daniel W Mundy¹

¹Department of Radiation Oncology, Mayo Clinic, Rochester, MN, USA.

International Journal of Particle Therapy

|May 17, 2024

Summary

Optimizing the proton therapy gantry breakpoint to 130° significantly reduces rotational movement compared to the standard 180°. This improves efficiency and precision for various cancer sites.

Keywords:

Gantry breakpoint Patient setup Proton therapy Treatment efficiency Workflow optimization

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Background:

The standard 180° gantry breakpoint in 360° radiotherapy systems is an arbitrary setting.
This conventional breakpoint may lead to inefficient gantry rotation and prolonged patient setup times.
Systematic evaluation is needed to determine an optimal breakpoint for full-gantry proton therapy systems.

Purpose of the Study:

To identify an optimal gantry breakpoint angle for a full-gantry proton therapy system.
The primary goal is to minimize gantry movement and enhance treatment delivery efficiency.

Main Methods:

Analysis of 70 months of proton therapy plans (9152 plans, 131,883 fractions).
Categorization by treatment site and mapping of fields to a full-gantry orientation.
Computation of minimum total gantry rotation angle as a function of breakpoint position (0°-360°), with and without a 20° overlap allowance.

Main Results:

A 130° breakpoint was identified as optimal, balancing rotational efficiency and practical considerations.
This 130° breakpoint reduced average gantry rotation by 41.4° per fraction compared to the 180° breakpoint (with 20° overlap).
Significant reductions in average gantry rotation were observed for gastrointestinal (192.2°), thoracic (56.3°), and pediatric (44.9°) sites.

Conclusions:

A 130° gantry breakpoint is superior to the conventional 180° for full-gantry proton therapy.
This optimization is particularly beneficial for gastrointestinal, pediatric, and thoracic cancer treatments.
Adjusting the breakpoint can streamline delivery, reduce mechanical wear, and improve treatment precision by minimizing patient movement.