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

doi:10.14316/pmp.2016.27.4.267

Journal List > Prog Med Phys > v.27(4) > 1098562

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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

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.

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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.

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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%).

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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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