Survey of Respiratory Motion Management Practices in Particle Therapy Facilities in Japan.
5 affiliations
- 1Department of Heavy Particle Medical Science, Yamagata University Graduate School of Medical Science, Yamagata, Japan.
- 2Tokushima University Graduate School of Biomedical Sciences, Tokushima, Japan.
- 3Medical Physics Laboratory, Division of Health Science, Osaka University Graduate School of Medicine, The University of Osaka, Osaka, Japan.
- 4Department of Radiotherapy, Medical Co. Hakuhokai, Osaka Proton Therapy Clinic, Ako Central Hospital, Osaka, Japan.
- 5Department of Radiological Technology, Niigata University of Health and Welfare, Niigata, Japan.
Abstract
Respiratory motion management is essential in particle therapy because dose distributions are highly sensitive to motion. This study aimed to clarify the current implementation and technical trends of respiratory motion management in particle therapy in Japan. A questionnaire was distributed to all particle therapy facilities in Japan. Responses were received from 16 of the 26 institutions surveyed (61.5%). The survey investigated treatment sites requiring respiratory motion management, CT datasets used for treatment planning, irradiation techniques, respiratory monitoring devices, gating phase determination methods, dose evaluation approaches, and patient positioning techniques. The liver and pancreas were the treatment sites most frequently managed with respiratory motion mitigation, with 81.3% (13/16) of facilities implementing motion management for both sites. The most commonly used CT dataset for treatment planning was end-expiration phase CT (56.3%, 9/16). End-expiration respiratory-gated irradiation was the most commonly used irradiation method (87.5%, 14/16), while free-breathing and breath-hold irradiation were used less frequently. Laser-based respiratory monitoring systems were the most widely used devices for respiratory waveform acquisition (80.0%, 12/15). Determination of the irradiation phase based on tumor motion magnitude was the most commonly adopted approach (66.7%, 10/15), whereas some facilities used the same irradiation phase for all patients (20.0%, 3/15). Only a limited number of institutions explicitly evaluated dose variations associated with the interplay effect induced by respiratory motion. These findings provide an overview of current respiratory motion management practices in particle therapy facilities in Japan and may contribute to future technological development and standardization of respiratory motion management in particle therapy.
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BibTeX
@article{miyasaka2026survey,
title = {{Survey of Respiratory Motion Management Practices in Particle Therapy Facilities in Japan.}},
author = {Yuya Miyasaka and Yuki Tominaga and Yushi Wakisaka and Mayu Nakata and Isamu Maeshima},
journal = {International journal of particle therapy},
year = {2026},
month = oct,
doi = {10.1016/j.ijpt.2026.101972},
url = {https://europepmc.org/article/MED/42997573},
note = {CC BY-NC-ND},
}
RIS
TY - JOUR
TI - Survey of Respiratory Motion Management Practices in Particle Therapy Facilities in Japan.
AU - Yuya Miyasaka
AU - Yuki Tominaga
AU - Yushi Wakisaka
AU - Mayu Nakata
AU - Isamu Maeshima
PY - 2026
DA - 2026/10/23
JO - International journal of particle therapy
DO - 10.1016/j.ijpt.2026.101972
UR - https://europepmc.org/article/MED/42997573
AB - Respiratory motion management is essential in particle therapy because dose distributions are highly sensitive to motion. This study aimed to clarify the current implementation and technical trends of respiratory motion management in particle therapy in Japan. A questionnaire was distributed to all particle therapy facilities in Japan. Responses were received from 16 of the 26 institutions surveyed (61.5%). The survey investigated treatment sites requiring respiratory motion management, CT datasets used for treatment planning, irradiation techniques, respiratory monitoring devices, gating phase determination methods, dose evaluation approaches, and patient positioning techniques. The liver and pancreas were the treatment sites most frequently managed with respiratory motion mitigation, with 81.3% (13/16) of facilities implementing motion management for both sites. The most commonly used CT dataset for treatment planning was end-expiration phase CT (56.3%, 9/16). End-expiration respiratory-gated irradiation was the most commonly used irradiation method (87.5%, 14/16), while free-breathing and breath-hold irradiation were used less frequently. Laser-based respiratory monitoring systems were the most widely used devices for respiratory waveform acquisition (80.0%, 12/15). Determination of the irradiation phase based on tumor motion magnitude was the most commonly adopted approach (66.7%, 10/15), whereas some facilities used the same irradiation phase for all patients (20.0%, 3/15). Only a limited number of institutions explicitly evaluated dose variations associated with the interplay effect induced by respiratory motion. These findings provide an overview of current respiratory motion management practices in particle therapy facilities in Japan and may contribute to future technological development and standardization of respiratory motion management in particle therapy.
SN - 2331-5180
ER -