Prog Med Phys.  2016 Dec;27(4):267-271. 10.14316/pmp.2016.27.4.267.

Commissioning and Validation of a Dedicated Scanning Nozzle at Samsung Proton Therapy Center

• Chung K
• Han Y
• Ahn SH
• Kim JS
• Nonaka H

• KMID: 2376562
• DOI: http://doi.org/10.14316/pmp.2016.27.4.267

Abstract

In this study, we present the commissioning and validation results of a dedicated scanning nozzle. The dedicated scanning nozzle is installed in one of the two gantry treatment rooms at Samsung Proton Therapy Center. Following a successful completion of the acceptance test, the commissioning process including the beam data measurement for treatment planning system has been conducted. Extended measurements have been conducted as a validation of the clinical performance of the nozzle and various quality assurance protocols have been prepared.

Keyword

Pencil beam scanning; Commissioning; Proton therapy

MeSH Terms

Proton Therapy*
Protons*
Protons

Figure

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  Fig. 1. The integrated depth dose curves for the selected beam energies (normalized at peak values).

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  Fig. 2. The clinical range (D90) of the dedicated scanning nozzle at Samsung PTC measured by PTW Bragg peak chamber and MLIC.

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  Fig. 3. The spot size calculated in one sigma for selected beam energies.

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  Fig. 4. Example of mono energetic scan patterns (Left: 150 MeV, Right: 190 MeV) created for validation and daily QA. The gamma passing rates were all above 95% with 3%, 3 mm criteria for both beam energies.

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  Fig. 5. Pseudo 3D dose distribution reconstructed from multi-depth measurement of 2D dose map (With 3% and 3 mm criteria, all XY, XZ, and YZ planes have a passing rate of 100%).

Reference

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4. Chung K., Kim J., Kim D.-H., Ahn S., Han Y.J. Korean Phys Soc. 67:170. 2015.