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Chung, Han, Ahn, Kim, and Nonaka: Commissioning and Validation of a Dedicated Scanning Nozzle at Samsung Proton Therapy Center
Original Article

Progress in Medical Physics 2016;27(4):267-271.

Published online: 17 December 2016

DOI: https://doi.org/10.14316/pmp.2016.27.4.267

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

Kwangzoo Chung∗, , Younyih Han∗, Sung Hwan Ahn∗, Jin Sung Kim†, Hideki Nonaka‡

∗Department of Radiation Oncology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea

†Department of Radiation Oncology, Yonsei Cancer Center, Yonsei University College of Medicine, Seoul, Korea

‡Division of Industrial Equipment, Sumitomo Heavy Industries Ltd., Niihama, Japan

Correspondence: Kwangzoo Chung (physicist.chung@gmail.com) Tel: 82-2-3410-1353, Fax: 82-2-3410-2619

Received 16 December 201623 December 2016       Accepted 24 December 2016

Copyright © 2016 Korean Society of Medical Physics

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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.

Keywords: Pencil beam scanning, Commissioning, Proton therapy

REFERENCES

1. Wilson R. R.Radiology. 47:487. 1946.
2. Jermann M.Int J Particle Ther. 2:50. 2015.
3. Chung K., Han Y., Kim J., et al. Radiat Oncol J. 33:337. 2015.
4. Chung K., Kim J., Kim D.-H., Ahn S., Han Y.J. Korean Phys Soc. 67:170. 2015.

Fig. 1.
The integrated depth dose curves for the selected beam energies (normalized at peak values).
pmp-27-267f1.tif
Fig. 2.
The clinical range (D90) of the dedicated scanning nozzle at Samsung PTC measured by PTW Bragg peak chamber and MLIC.
pmp-27-267f2.tif
Fig. 3.
The spot size calculated in one sigma for selected beam energies.
pmp-27-267f3.tif
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.
pmp-27-267f4.tif
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%).
pmp-27-267f5.tif
Table 1.
Selected rehearsal cases for the physical and clinical commissioning of the dedicated scanning nozzle.
Case number Dx. Site ∗2D Dose QA Note
1 PED 99.0% CSI
2 HCC 97.8%  
3 Brain 98.1%  
4 Lung 98.5%  
5 PED 99.5% Brain
6 Recurrent rectal 98.8%  
7 Head and neck 99.3%  
8 Prostate 99.5% Definitive
9 Esophagus 97.5% Long Y-extent

∗ 2D Dose QA: the gamma passing rate of the treatment fieldwith the lowest value.

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