トップ›研究者一覧›冨永裕樹

研究者を探す

研究者にアプローチする
更新情報を通知する

冨永裕樹

徳島大学

プロフィール
教育活動
研究活動
社会活動
リサーチマップ・
Jグローバル
KAKEN
注目研究

研究者総覧で最新データを確認する

2025年10月8日更新

職名: 講師
電話: 研究者総覧に該当データはありませんでした。
電子メール: 研究者総覧に該当データはありませんでした。
学歴: 2008/4: 岡山大学医学部保健学科放射線技術科学専攻 ( - 2012. 3.)
2018/4: 岡山大学大学院保健学研究科放射線技術科学分野 ( - 2020. 3.)
2020/4: 岡山大学大学院ヘルスシステム統合科学研究科 ( - 2023. 3.)
学位: 博士 / 博士(統合科学) (岡山大学) (2023年3月)
職歴・経歴: 2025/10: 徳島大学講師, 大学院医歯薬学研究部

専門分野・研究分野: ライフサイエンス (Life sciences) [放射線科学 (Radiology)]

研究者総覧で最新データを確認する

2025年10月8日更新

専門分野・研究分野: ライフサイエンス (Life sciences) [放射線科学 (Radiology)]
担当経験のある授業科目: MRI技術学 (学部)
医用工学概論 (学部)
実践医療安全管理学実習 (学部)
実践臨床技能実習 (学部)
画像病態学 (学部)
診療画像学実習 (学部)
電気電子工学 (学部)
指導経験: 研究者総覧に該当データはありませんでした。

研究者総覧で最新データを確認する

2025年10月8日更新

専門分野・研究分野: ライフサイエンス (Life sciences) [放射線科学 (Radiology)]

研究テーマ: 研究者総覧に該当データはありませんでした。

著書

橘昌幸, 岩元新一郎, 奥村雅彦, 冨永裕樹 :
放射線治療技術学 (診療放射線技術テキストシリーズ),
共立出版株式会社, 東京, 2024年12月. スキャニングガイドライン作成ワーキンググループ, 冨永裕樹 :
粒子線治療装置の物理・技術的QAシステムガイドライン(粒子線 QA2016)追補版[2020年],
社団法人日本放射線技術学会, 2020年12月. 冨永裕樹 :
月刊新医療 46 (6), --- ラスタースキャニング法を用いた陽子線治療の臨床状況と今後の展望 ---,
株式会社エム・イー振興協会, 東京, 2019年6月.

論文

Yusuke Suzuki, Motoharu Sasaki, Yuji Nakaguchi, Takeshi Kamomae, Yuki Kanazawa, Yuki Tominaga, Sohma Sawada, Yuto Yamaji and Hitoshi Ikushima :
Efficient Knowledge-based Planning Model Construction in Institutions with Limited Cases Using Plan Quality Metrics,
Radiological Physics and Technology, 2025.

(要約): Prostate cancer volumetric modulated arc therapy (VMAT) planning often faces challenges in the construction of high-quality RapidPlan models when the number of cases is limited. In the present study, we retrospectively scored 90 VMAT plans using Plan Quality Metrics (PQM) and Adjusted PQM (APQM) and constructed 12 RapidPlan models from various combinations of cases with high and low PQM or APQM scores, each trained on 30 cases. Six representative models were selected for a detailed evaluation, including the P_H model based on the top 30 PQM cases and the AP_H model based on the top 30 APQM cases. All models were tested on ten independent cases that exhibited varying planning difficulties. The overall plan quality was assessed using PQM scores and dose-volume histogram (DVH) metrics for targets and organs at risk (OARs). The P_H model demonstrated significantly higher PQM scores than all other models (p < 0.05), with superior consistency and improved OAR sparing. Although the AP_H model performed well, the results were inconsistent. In challenging cases, the P_H model maintained a stable quality and outperformed both manual plans and APQM-based models. These findings indicated that case selection based on the actual clinical plan quality (PQM) is more effective than selection based on theoretical dose distributions (APQM) for building robust RapidPlan models, particularly when data are limited. This method is practical for small institutions and could be further improved by standardizing the PQM-based selection criteria and optimizing priority settings to enhance the generalizability and clinical utility of knowledge-based planning.
(出版サイトへのリンク): ● Publication site (DOI): 10.1007/s12194-025-00970-7
(文献検索サイトへのリンク): ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 41023366; ● Search Scopus @ Elsevier (PMID): 41023366; ● Search Scopus @ Elsevier (DOI): 10.1007/s12194-025-00970-7

(DOI: 10.1007/s12194-025-00970-7, PubMed: 41023366) Yushi Wakisaka, Yuki Tominaga, Keith M Furutani and Teiji Nishio :
Dosimetric and Temporal Evaluation of Dynamic Collimation with Multi-Leaf Collimator in Scanned Proton Therapy: A Planning Study,
Physica Medica, 137, 105088, 2025.

(要約): The MELTHEA V proton therapy system incorporates a beam nozzle capable of both passive scattering and active scanning, featuring a multi-leaf collimator (MLC). This study evaluates the dosimetric and temporal efficiency of dynamic collimation using the universal MLC with the scanning method. Three MLC configurations were defined: (1) nMLC - no MLC use; (2) sMLC - static leaf positioning across all energy layers; and (3) dMLC - dynamic leaf positioning changing with each energy layer. Since the treatment planning system does not support dMLC natively, it was implemented via scripting. First, various MLC margins were evaluated through phantom simulations. Then, using a representative margin, treatment plans for nine liver cancer cases were assessed for each MLC configuration. Irradiation delay time was simulated considering monitor units, dose rates, and the time characteristics of the irradiation system. Phantom simulations demonstrated that an MLC margin of 0.5ς (with ς representing the in-medium spot size) effectively reduced the surrounding dose while preserving target coverage. For liver cancer cases, the average conformity index at the 50 % isodose line for nMLC, sMLC, and dMLC was 3.27 ± 0.60, 2.61 ± 0.28, and 2.28 ± 0.24, respectively. The mean doses in a 10-mm ring surrounding the target were 54.9 ± 2.5, 48.3 ± 3.9, and 41.4 ± 3.8 Gy, respectively. The average irradiation delay time of the dMLC was 8.4 %. The dMLC demonstrated enhanced dosimetric performance compared to nMLC and sMLC, with minimal irradiation time delays, making it suitable for clinical liver cancer treatment.
(キーワード): Proton Therapy / Radiotherapy Planning, Computer-Assisted / Humans / Radiometry / Time Factors / Phantoms, Imaging / Radiotherapy Dosage / Liver Neoplasms
(出版サイトへのリンク): ● Publication site (DOI): 10.1016/j.ejmp.2025.105088
(文献検索サイトへのリンク): ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 40848402; ● Summary page in Scopus @ Elsevier: 2-s2.0-105013793144

(DOI: 10.1016/j.ejmp.2025.105088, PubMed: 40848402, Elsevier: Scopus) Yuki Tominaga, Yushi Wakisaka, Takahiro Kato, Masaya Ichihara, Keisuke Yasui, Motoharu Sasaki, Masataka Oita and Teiji Nishio :
Commissioning of respiratory-gated 4D dynamic dose calculations for various gating widths without spot timestamp in proton pencil beam scanning,
Medical Physics, 52, 8, e18026, 2025.

(要約): Proton pencil beam scanning (PBS) is susceptible to dose degradation because of interplay effects on moving targets. For cases of unacceptable motion, respiratory-gated (RG) irradiation is an effective alternative to free breathing (FB) irradiation. However, the introduction of RG irradiation with larger gate widths (GW) is hindered by interplay effects, which are analogous to those observed with FB irradiation. Accurate estimation of interplay effects can be performed by recording spot timestamps. However, our machine lacks this feature, making it imperative to find an alternative approach. Thus, we developed an RG 4-dimensional dynamic dose (RG-4DDD) system without spot timestamps. This study aimed to investigate the accuracy of calculated doses from the RG-4DDD system for PBS plans with varying breathing curves, amplitudes, and periods for 10%-50% GW. RG-4DDDs were reconstructed using in-house developed software that assigned timestamps to individual spots, integrated start times for spills with breathing curves, and utilized deformable registrations for dose accumulation. Three cubic verification plans were created using a heterogeneous phantom. Additionally, typical liver and lung cases were employed for patient plan validation. Single- and multi-field-optimized (SFO and IMPT) plans (ten beams in total) were created for the liver and lung cases in a homogeneous phantom. Lateral profile measurements were obtained under both motion and no-motion conditions using a 2D ionization chamber array (2D-array) and EBT3 Gafchromic films on the CIRS dynamic platform. Breathing curves from the cubic plans were used to assess nine patterns of sine curves, with amplitudes of 5.0-10.0 mm (10.0-20.0 mm target motions) and periods of 3-6 sec. Patient field verifications were conducted using a representative patient curve with an average amplitude of 6.4 mm and period of 3.2 sec. Additional simulations were performed assuming a ± 10% change in assigned timestamps for the dose rate (DR), spot spill (0.08-s), and gate time delay (0.1-s) to evaluate the effect of parameter selection on our 4DDD models. The 4DDDs were compared with measured values using the 2D gamma index and absolute doses over that required for dosing 95% of the target. The 2D-array measurements showed that average gamma scores for the reference (no motion) and 4DDD plans for all GWs were at least 99.9 ± 0.2% and 98.2 ± 2.4% at 3%/3 mm, respectively. The gamma scores of the 4DDDs in film measurements exceeded 95.4% and 92.9% at 2%/2 mm for the cubic and patient plans, respectively. The 4DDD calculations were acceptable under DR changes of ±10% and both spill and gate time delays of ±0.18 sec. For the 4DDD plan using all GWs for all measurement points, the absolute point differences for all validation plans were within ±5.0% for 99.1% of the points. The RG-4DDD calculations (less than 50% GW) of the heterogeneous and actual patient plans showed good agreement with measurements for various breathing curves in the amplitudes and periods described above. The proposed system allows us to evaluate actual RG irradiation without requiring the ability to record spot timestamps.
(キーワード): Radiotherapy Planning, Computer-Assisted / Proton Therapy / Humans / Radiotherapy Dosage / Radiation Dosage / Phantoms, Imaging / 呼吸 (respiration) / Respiratory-Gated Imaging Techniques / Four-Dimensional Computed Tomography / Time Factors / Lung Neoplasms
(出版サイトへのリンク): ● Publication site (DOI): 10.1002/mp.18026
(文献検索サイトへのリンク): ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 40790932; ● Summary page in Scopus @ Elsevier: 2-s2.0-105013325416

(DOI: 10.1002/mp.18026, PubMed: 40790932, Elsevier: Scopus) Yuya Miyasaka, Yuki Tominaga, Yushi Wakisaka and Isamu Maeshima :
Survey and profile data study on particle therapy technology in Japan,
Japanese Journal of Radiology, 2025.

(要約): The purpose of this study is to report profile data on the technical elements of Japanese particle therapy facilities. We requested a survey on the following four technical elements; (1) facilities and systems, (2) immobilization device and treatment planning CT, (3) patient specific QA, and (4) patient positioning. Responses were received from 21 facilities. The most commonly used accelerators were synchrotrons, which were used in 17 facilities (81.0%). The lowest available energy was widely distributed between 55.6 MeV/u and 290 MeV/u, but the maximum energy was often around 240 MeV/u for proton beams and 430 MeV for carbon ion beams. Of all treatment rooms, passive irradiation accounted for 57.7% (30 rooms), layer stacking irradiation for 7.7% (4 rooms), and scanning irradiation for 32.7% (17 rooms). Shell-type immobilization devices were most commonly used in the head and neck region, and vacuum bags were most commonly used in the thoracic to caudal regions. Lateral dose profile measurement was the most commonly used patient specific QA method. The most commonly used detector was the ionization chamber or ionization chamber-type planar detector. 2D X-ray radiography was the most commonly used in patient positioning. Marker matching was commonly used for the prostate and liver, bone matching for the head and neck and lungs, and tumor matching was used only sparingly. The results of this study may clarify current issues in particle therapy technology and provide data to guide further technology development.
(出版サイトへのリンク): ● Publication site (DOI): 10.1007/s11604-025-01844-z
(文献検索サイトへのリンク): ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 40699545; ● Summary page in Scopus @ Elsevier: 2-s2.0-105011357790

(DOI: 10.1007/s11604-025-01844-z, PubMed: 40699545, Elsevier: Scopus) Keisuke Yasui, Miuna Hayashi, Shiryu Otsuka, Toshiyuki Toshito, Chihiro Omachi, Masaya Ichihara, Riki Oshika, Yuki Tominaga, Hiromi Baba, Hidetoshi Shimizu and Naoki Hayashi :
Postal dosimetry audit for scanning proton beam using radiophotoluminescence glass dosimeter: A multicenter pilot study,
Medical Physics, 52, 6, 4996-5004, 2025.

(要約): Accurate dosimetry is important in radiotherapy, and all equipment used for radiotherapy shoud be audited by an independent external dose audit. Radiophotoluminescence glass dosimeter (RPLD) has excellent characteristics and is widely used for postal dose audit; however, postal dose audit for proton therapy using RPLD has not been established. This study aims to develop a postal dose audit procedure for scanning proton beams using RPLD, estimate uncertainties, and conduct a multicenter pilot study to validate the methodology. A postal toolkit was developed and a postal dose audit procedure for RPLD measurements of scanning proton beams was established in cooperation with several facilities that employ various accelerators, irradiation equipment, and treatment planning systems (TPS) for clinical use. Based on basic and previous studies, an uncertainty budget was developed for estimating relative uncertainty and pilot studies were conducted at each site. A method for postal dose audits was developed in a multicenter collaboration to develop an approach suitable for implementation across multiple facilities. The relative response of 60 RPLDs for scanning proton beam examined in this study was 1.00 ± 1.28% mean ± standard deviation. The combined relative standard uncertainty of postal dosimetry for scanning proton beams using the RPLD was 2.97% (k = 1). Under the reference condition, the maximum differences between the ionization chamber measurement (IC) and TPS, RPLD and TPS, and RPLD and IC were 0.97, 1.88, and 2.12%, respectively. The maximum differences between the RPLD and ionization chamber for plateau measurements at 3 cm depth using single-energy and non-reference conditions were 11.31 and 4.02%, respectively. We established a procedure for the postal dose audits of proton beams using RPLD and presented the results of a multicenter pilot study. By standardizing the reference conditions, the dosimetry uncertainty was estimated at 2.92%. The results demonstrated the feasibility of performing an independent third-party dose audit of scanning proton beams using RPLD, and for such postal dose audits for proton beams, the irradiation conditions should be standardized to reduce uncertainties. These results are expected to contribute to the development of proton beams.
(キーワード): Glass / Pilot Projects / Proton Therapy / Radiation Dosimeters / Radiometry / Radiotherapy Dosage / Uncertainty
(出版サイトへのリンク): ● Publication site (DOI): 10.1002/mp.17790
(文献検索サイトへのリンク): ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 40156355; ● Summary page in Scopus @ Elsevier: 2-s2.0-105001879885

(DOI: 10.1002/mp.17790, PubMed: 40156355, Elsevier: Scopus) Yushi Wakisaka, Masashi Yagi, Yuki Tominaga, Shinichi Shimizu, Teiji Nishio and Kazuhiko Ogawa :
Nuclear interaction correction based on dual-energy computed tomography in carbon-ion radiotherapy,
Physics in Medicine and Biology, 70, 5, 2025.

(要約): Objective.Accurate dose predictions are crucial to maximizing the benefits of carbon-ion therapy (CIT). Carbon beams incident on the human body cause nuclear interactions with tissues, resulting in changes in the constituent nuclides and leading to dose errors that are conventionally corrected using conventional single-energy computed tomography (SECT). Dual-energy computed tomography (DECT) has frequently been used for stopping power estimation in particle therapy and is well suited for correcting nuclear reactions because of its detailed body-tissue elemental information. This study proposes a correction method for the absolute dose in CIT that considers changes in nuclide composition resulting from nuclear reactions with body tissues, as a novel application of DECT.Approach.The change in dose associated with nuclear reactions is determined by correcting each integrated depth dose component of the carbon beam using a nuclear interaction correction factor. This factor is determined based on the stopping power, mass density, and nuclear interaction cross-section in body tissue. The stopping power and mass density were calculated using established methods, whereas the nuclear interaction cross-section was newly defined through a conversion equation derived from the effective atomic number.Main results.Nuclear interaction correction factors and corrected doses were determined for 85 body tissues with known compositions, comparing them with existing SECT-based methods. The root-mean-square errors of the SECT- and DECT-based nuclear interaction correction factors relative to theoretical values were 0.66% and 0.39%, respectively.Significance.This indicates a notable enhancement in the estimation accuracy with DECT. The dose calculations in uniform body tissues derived from SECT showed slight over-correction in adipose and bone tissues, whereas those based on DECT were almost consistent with theoretical values. Our proposed method demonstrates the potential of DECT for enhancing dose calculation accuracy in CIT, complementing its established role in stopping power estimation.
(キーワード): Heavy Ion Radiotherapy / Tomography, X-Ray Computed / Humans / Radiotherapy Dosage
(出版サイトへのリンク): ● Publication site (DOI): 10.1088/1361-6560/adaad4
(文献検索サイトへのリンク): ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 39813823; ● Summary page in Scopus @ Elsevier: 2-s2.0-85218426993

(DOI: 10.1088/1361-6560/adaad4, PubMed: 39813823, Elsevier: Scopus) Motoharu Sasaki, Yuji Nakaguchi, Takeshi Kamomae, Akira Tsuzuki, Sohma Sawada, Kohki Shibuya, Masataka Oita, Masahide Tominaga, Yuki Tominaga and Hitoshi Ikushima :
Comparative analysis of two dose-volume histogram prediction tools for treatment planning in volumetric-modulated arc therapy: A multi-planner study,
Medical Dosimetry, 49, 3, 271-275, 2024.

(要約): The increase in high-precision radiation therapy, particularly volumetric-modulated arc therapy (VMAT), has increased patient numbers and expanded treatment sites. However, a significant challenge in VMAT treatment planning is the inconsistent plan quality among different planners and facilities. This study explored the use of dose-volume histogram (DVH) prediction tools to address these disparities, specifically focusing on RapidPlan (Varian Medical Systems) and PlanIQ (Sun Nuclear). RapidPlan predicts achievable DVHs and automatically generates optimization objectives. While it has demonstrated organ-at-risk (OAR) dose reduction benefits, the quality of the plan used to build its model significantly affects its predictions. On the other hand, PlanIQ offers ease of use and does not require prior model-building. Five planners participated in this study, each creating two treatment plans: one referencing RapidPlan and the other using PlanIQ. The planners had the freedom to adjust parameters while referencing the DVH predictions. The plans were evaluated using "Plan Quality Metric" (PQM) scores to assess the planning target volume excluding the rectum and OARs. The results revealed that RapidPlan-referenced plans often outperformed PlanIQ-based plans, with less interplanner variability. PlanIQ played a pivotal role in the construction of the RapidPlan model. This study is the first to compare plans generated by multiple planners using both tools. This study provides insights into optimizing treatment planning by considering the characteristics of both RapidPlan and PlanIQ.
(出版サイトへのリンク): ● Publication site (DOI): 10.1016/j.meddos.2024.02.002
(文献検索サイトへのリンク): ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 38556402; ● Summary page in Scopus @ Elsevier: 2-s2.0-85189070108

(DOI: 10.1016/j.meddos.2024.02.002, PubMed: 38556402, Elsevier: Scopus) Yuki Tominaga, Masaki Suga, Mikuni Takeda, Yuki Yamamoto, Takashi Akagi, Takahiro Kato, Sunao Tokumaru, Michinori Yamamoto and Masataka Oita :
Comparing interplay effects in scanned proton therapy of lung cancer: Free breathing with various layer and volume rescanning versus respiratory gating with different gate widths.,
Physica Medica, 120, 103323, 2024.

(要約): PURPOSE: We investigated interplay effects and treatment time (TT) in scanned proton therapy for lung cancer patients. We compared free-breathing (FB) approaches with multiple rescanning strategies and respiratory-gating (RG) methods with various gating widths to identify the superior irradiation technique. METHODS: Plans were created with 4/1, 2/2, and 1/4 layered/volume rescans of FB (L4V1, L2V2, and L1V4), and 50%, 30%, and 10% gating widths of the total respiratory curves (G50, G30, and G10) of the RG plans with L4V1. We calculated 4-dimensional dynamic doses assuming a constant sinusoidal curve for six irradiation methods. The reconstructed doses per fraction were compared with planned doses in terms of dose differences in 99% clinical-target-volume (CTV) (ΔD99%), near-maximum dose differences (ΔD2%) at organs-at-risk (OARs), and TT. RESULTS: The mean/minimum CTV ΔD99% values for FB were -1.0%/-4.9%, -0.8%/-4.3%, and -0.1%/-1.0% for L4V1, L2V2, and L1V4, respectively. Those for RG were -0.3%/-1.7%, -0.1%/-1.0%, and 0.0%/-0.5% for G50, G30, and G10, respectively. The CTV ΔD99% of the RGs with less than 50% gate width and the FBs of L1V4 were within the desired tolerance (±3.0%), and the OARs ΔD2% for RG were lower than those for FB. The mean TTs were 90, 326, 824, 158, 203, and 422 s for L4V1, L2V2, L1V4, G50, G30, and G10, respectively. CONCLUSIONS: FB (L4V1) is the most efficient treatment, but not necessarily the optimal choice due to interplay effects. To satisfy both TT extensions and interplay, RG with a gate width as large as possible within safety limits is desirable.
(キーワード): Humans / Lung Neoplasms / Proton Therapy / Radiotherapy Planning, Computer-Assisted / Respiration / Radiotherapy Dosage / Four-Dimensional Computed Tomography
(出版サイトへのリンク): ● Publication site (DOI): 10.1016/j.ejmp.2024.103323
(文献検索サイトへのリンク): ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 38461635; ● Summary page in Scopus @ Elsevier: 2-s2.0-85187325324

(DOI: 10.1016/j.ejmp.2024.103323, PubMed: 38461635, Elsevier: Scopus) Yuki Tominaga, Masaki Suga, Mikuni Takeda, Yuki Yamamoto, Takashi Akagi, Takahiro Kato, Sunao Tokumaru, Michinori Yamamoto and Masataka Oita :
Dose-volume comparisons of proton therapy for pencil beam scanning with and without multi-leaf collimator and passive scattering in patients with lung cancer,
Medical Dosimetry, 49, 1, 13-18, 2023.

(要約): This study evaluated the dose distributions of proton pencil beam scanning (PBS) with/without a multileaf collimator (MLC) compared to passive scattering (PS) for stage I/II lung cancers. Collimated/uncollimated (PBS+/PBS-) and PS plans were created for 20 patients. Internal-clinical-target-volumes (ICTVs) and planning-target-volumes (PTVs) with a 5 mm margin were defined on the gated CTs. Organs-at-risk (OARs) are defined as the normal lungs, spinal cord, esophagus, and heart. The prescribed dose was 66 Gy relative-biological-effectiveness (RBE) in 10 fractions at the isocenter and 50% volume of the ICTVs for the PS and PBS, respectively. We compared the target and OAR dose statistics from the dose volume histograms. The PBS+ group had a significantly better mean PTV conformity index than the PBS- and PS groups. The mean dose sparing for PBS+ was better than those for PBS- and PS. Only the normal lung doses of PBS- were worse than those of PS. The overall performance of the OAR sparing was in the order of PBS+, PBS-, and PS. The PBS+ plan showed significantly better target homogeneity and OAR sparing than the PBS- and PS plans. PBS requires collimating systems to treat lung cancers with the most OAR sparing while maintaining the target coverage.
(キーワード): Humans / Lung Neoplasms / Proton Therapy / Radiotherapy Dosage / Radiotherapy Planning, Computer-Assisted / Radiotherapy, Intensity-Modulated / Organs at Risk
(出版サイトへのリンク): ● Publication site (DOI): 10.1016/j.meddos.2023.10.006
(文献検索サイトへのリンク): ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 37940436; ● Summary page in Scopus @ Elsevier: 2-s2.0-85175703812

(DOI: 10.1016/j.meddos.2023.10.006, PubMed: 37940436, Elsevier: Scopus) Yuki Tominaga, Masataka Oita, Junya Miyata and Takahiro Kato :
Experimental validation of a 4D dynamic dose calculation model for proton pencil beam scanning without spot time stamp considering free-breathing motion.,
Medical Physics, 51, 1, 566-578, 2023.

(要約): PURPOSE: We developed a 4-dimensional dynamic dose (4DDD) calculation model for proton pencil beam scanning (PBS). This model incorporates the spill start time for all energies and uses the remaining irradiated spot time model instead of irradiated spot time logs. This study aimed to validate the calculation accuracy of a log file-based 4DDD model by comparing it with dose measurements performed under free-breathing conditions, thereby serving as an alternative approach to the conventional log file-based system. METHODS: Three cubic verification plans were created using a heterogeneous block phantom; these plans were created using 10 phase 4D-CT datasets of the phantom. The CIRS dynamic platform was used to simulate motion with amplitudes of 2.5, 3.75, and 5.0 mm. These plans consisted of eight- and two-layered rescanning techniques. The lateral profiles were measured using a 2D ionization chamber array (2D-array) and EBT3 Gafchromic films at four starting phases, including three sinusoidal curves (periods of 3, 4, and 6 s) and a representative patient curve during actual treatment. 4DDDs were calculated using in-house scripting that assigned a time stamp to each spot and performed dose accumulation using deformable image registration. Furthermore, to evaluate the impact of parameter selection on our 4DDD model calculations, simulations were performed assuming a ±10% change in irradiation time stamp (0.8 ± 0.08 s) and spot scan speed. We evaluated the 2D gamma index and the absolute point doses between the calculated values and the measurements. RESULTS: The 2D-array measurements revealed that the gamma scores for the static plans (no motion) and 4DDD plans exceeded 97.5% and 93.9% at 3%/3 mm, respectively. The average gamma score of the 4DDD plans was at least 96.1%. When using EBT3 films, the gamma scores of the 4DDD model exceeded 92.4% and 98.7% at 2%/2 mm and 3%/3 mm, respectively. Regarding the 4DDD point dose differences, more than 95% of the dose regions exhibited discrepancies within ±5.0% for 97.7% of the total points across all plans. The spot time assignment accuracy of our 4DDD model was acceptable even with ±10% sensitivity. However, the accuracy of the scan speed, when varied within ±10% sensitivity, was not acceptable (minimum gamma scores of 82.6% and maximum dose difference of 12.9%). CONCLUSIONS: Our 4DDD calculations under free-breathing conditions using amplitudes of less than 5.0 mm were in good agreement with the measurements regardless of the starting phases, breathing curve patterns (between 3 and 6 s periods), and varying numbers of layered rescanning. The proposed system allows us to evaluate actual irradiated doses in various breathing periods, amplitudes, and starting phases, even on PBS machines without the ability to record spot logs.
(キーワード): Humans / Protons / 呼吸 (respiration) / Proton Therapy / Motion / Four-Dimensional Computed Tomography / Radiotherapy Planning, Computer-Assisted / Radiotherapy Dosage
(出版サイトへのリンク): ● Publication site (DOI): 10.1002/mp.16725
(文献検索サイトへのリンク): ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 37672227; ● Summary page in Scopus @ Elsevier: 2-s2.0-85170032311

(DOI: 10.1002/mp.16725, PubMed: 37672227, Elsevier: Scopus) Junya Miyata, Yuki Tominaga, Kazuto Kondo, Yasuaki Sonoda, Hideki Hanazawa, Mami Sakai, Satoshi Itasaka, Masataka Oita and Masahiro Kuroda :
Dosimetric comparison of pencil beam scanning proton therapy with or without multi-leaf collimator versus volumetric-modulated arc therapy for treatment of malignant glioma,
Medical Dosimetry, 48, 2, 105-112, 2023.

(要約): This study aimed to examine the dosimetric effect of intensity-modulated proton therapy (IMPT) with a multi-leaf collimator (MLC) in treating malignant glioma. We compared the dose distribution of IMPT with or without MLC (IMPT_MLC+ or IMPT_MLC-, respectively) using pencil beam scanning and volumetric-modulated arc therapy (VMAT) in simultaneous integrated boost (SIB) plans for 16 patients with malignant gliomas. High- and low-risk target volumes were assessed using D_2%, V_90%, V_95%, homogeneity index (HI), and conformity index (CI). Organs at risk (OARs) were evaluated using the average dose (D_mean) and D_2%. Furthermore, the dose to the normal brain was evaluated using from V_5Gy to V_40Gy at 5 Gy intervals. There were no significant differences among all techniques regarding V_90%, V_95%, and CI for the targets. HI and D_2% for IMPT_MLC+ and IMPT_MLC- were significantly superior to those for VMAT (p < 0.01). The D_mean and D_2% of all OARs for IMPT_MLC+ were equivalent or superior to those of other techniques. Regarding the normal brain, there was no significant difference in V_40Gy among all techniques whereas V_5Gy to V_35Gy in IMPT_MLC+ were significantly smaller than those in IMPT_MLC- (with differences ranging from 0.45% to 4.80%, p < 0.05) and VMAT (with differences ranging from 6.85% to 57.94%, p < 0.01). IMPT_MLC+ could reduce the dose to OARs, while maintaining target coverage compared to IMPT_MLC- and VMAT in treating malignant glioma.
(キーワード): Humans / Radiotherapy, Intensity-Modulated / Proton Therapy / Radiotherapy Dosage / Radiotherapy Planning, Computer-Assisted / Glioma / Organs at Risk
(出版サイトへのリンク): ● Publication site (DOI): 10.1016/j.meddos.2023.01.008
(文献検索サイトへのリンク): ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 36914455; ● Summary page in Scopus @ Elsevier: 2-s2.0-85149891927

(DOI: 10.1016/j.meddos.2023.01.008, PubMed: 36914455, Elsevier: Scopus) Yuki Tominaga, Masataka Oita, Takashi Akagi, Junya Miyata, Shuichi Harada, Tetsunori Matsuda and Masahiro Kuroda :
Comparison of the Dose Calculation Accuracy between the Commercial Pencil Beam Algorithm and Various Statistical Uncertainties with Monte Carlo Algorithm in New Proton Pencil Beam Scanning System,
Radiation Environment and Medicine, 12, 1, 53-64, 2023.

(要約): We validated the calculation accuracies and times between the pencil beam algorithm (PBA) and the Monte Carlo (MC) algorithm in the new proton pencil beam scanning system. Thirty-three (homogeneous phantom) and three (heterogeneous phantom) uniform-dose plans were verified for cubic targets. These plans were calculated using the PBA and five MC statistical uncertainties of 0.3%, 0.5%, 1.0%, 1.5%, and 2.0%. We also evaluated the required dose calculation times per beam with the statistical analysis. Then, eight clinically realistic beams were validated as the end-toend test. The dose differences of 0.3% and 0.5% uncertainty MC plans were satisfied our tolerance (< ±3.0%). All five uncertainty MC plans improved at least the average/minimum gamma score from 93.8%/33.5% to 98.5%/88.9% for homogeneous (2%/2 mm) and 96.7%/83.9% to 98.8%/94.1% for heterogeneous (3%/3 mm) than PBA plans. However, the average calculation times of 0.3% and 0.5% uncertainties in MC plans were 15.5 and 5.8 times longer than in PBA plans (p < 0.001). The endto-end tests satisfied the acceptable with a statistical uncertainty of MC below 0.5%. Although the dose calculation times would be significantly increased, we suggest that the statistical uncertainty of MC below 0.5% is appropriate for clinical use with PBS plans.
(出版サイトへのリンク): ● Publication site (DOI): 10.51083/radiatenvironmed.12.1_53
(文献検索サイトへのリンク): ● CiNii @ 国立情報学研究所 (CRID): 1390295336734760832; ● Search Scopus @ Elsevier (DOI): 10.51083/radiatenvironmed.12.1_53

(DOI: 10.51083/radiatenvironmed.12.1_53, CiNii: 1390295336734760832) Yuki Tominaga, Yusuke Sakurai, Junya Miyata, Shuichi Harada, Takashi Akagi and Masataka Oita :
Validation of pencil beam scanning proton therapy with multi-leaf collimator calculated by a commercial Monte Carlo dose engine.,
Journal of Applied Clinical Medical Physics, 23, 12, e13817, 2022.

(要約): This study aimed to evaluate the clinical beam commissioning results and lateral penumbra characteristics of our new pencil beam scanning (PBS) proton therapy using a multi-leaf collimator (MLC) calculated by use of a commercial Monte Carlo dose engine. Eighteen collimated uniform dose plans for cubic targets were optimized by the RayStation 9A treatment planning system (TPS), varying scan area, modulation widths, measurement depths, and collimator angles. To test the patient-specific measurements, we also created and verified five clinically realistic PBS plans with the MLC, such as the liver, prostate, base-of-skull, C-shape, and head-and-neck. The verification measurements consist of the depth dose (DD), lateral profile (LP), and absolute dose (AD). We compared the LPs and ADs between the calculation and measurements. For the cubic plans, the gamma index pass rates (γ-passing) were on average 96.5% ± 4.0% at 3%/3 mm for the DD and 95.2% ± 7.6% at 2%/2 mm for the LP. In several LP measurements less than 75 mm depths, the γ-passing deteriorated (increased the measured doses) by less than 90% with the scattering such as the MLC edge and range shifter. The deteriorated γ-passing was satisfied by more than 90% at 2%/2 mm using uncollimated beams instead of collimated beams except for three planes. The AD differences and the lateral penumbra width (80%-20% distance) were within ±1.9% and ± 1.1 mm, respectively. For the clinical plan measurements, the γ-passing of LP at 2%/2 mm and the AD differences were 97.7% ± 4.2% on average and within ±1.8%, respectively. The measurements were in good agreement with the calculations of both the cubic and clinical plans inserted in the MLC except for LPs less than 75 mm regions of some cubic and clinical plans. The calculation errors in collimated beams can be mitigated by substituting uncollimated beams.
(キーワード): Humans / Radiotherapy Dosage / Phantoms, Imaging / Proton Therapy / Lipopolysaccharides / Radiotherapy Planning, Computer-Assisted / Monte Carlo Method
(出版サイトへのリンク): ● Publication site (DOI): 10.1002/acm2.13817
(文献検索サイトへのリンク): ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 36420959; ● Summary page in Scopus @ Elsevier: 2-s2.0-85142535379

(DOI: 10.1002/acm2.13817, PubMed: 36420959, Elsevier: Scopus) 山中将史, 多田光寿, 春名孝泰, 平井諒太, 張智凱, 田村瑞希, 山本崇裕, 伊田和司, 冨永裕樹, 井原弘貴, 金東村, 丹羽康江, 脇隆博, 松田哲典 :
前立腺がんの陽子線治療における前斜方向ビームのロバスト性の評価,
津山中央病院医学雑誌, 34, 1, 17-29, 2020年. 冨永裕樹, 笈田将皇, 山中将史, 多田光寿, 松田哲典 :
多機能ノズル搭載の陽子線治療装置におけるペンシルビームスキャニング法のクリニカルビームコミッショニング,
津山中央病院医学雑誌, 34, 1, 31-45, 2020年. Soichi Sugiyama, Kuniaki Katsui, Yuki Tominaga, Takahiro Waki, Norihisa Katayama, Hidenobu Matsuzaki, Shin Kariya, Masahiro Kuroda, Kazunori Nishizaki and Susumu Kanazawa :
Dose distribution of intensity-modulated proton therapy with and without a multi-leaf collimator for the treatment of maxillary sinus cancer: a comparative effectiveness study,
Radiation Oncology, 14, 1, 209, 2019.

(要約): Severe complications, such as eye damage and dysfunciton of salivary glands, have been reported after radiotherapy among patients with head and neck cancer. Complications such as visual impairment have also been reported after proton therapy with pencil beam scanning (PBS). In the case of PBS, collimation can sharpen the penumbra towards surrounding normal tissue in the low energy region of the proton beam. In the current study, we examined how much the dose to the normal tissue was reduced by when intensity-modulated proton therapy (IMPT) was performed using a multi-leaf collimator (MLC) for patients with maxillary sinus cancer. Computed tomography findings of 26 consecutive patients who received photon therapy at Okayama University Hospital were used in this study. We compared D2% of the region of interest (ROI; ROI-_D2%) and the mean dose of ROI (ROI-_mean) with and without the use of an MLC. The organs at risk (OARs) were the posterior retina, lacrimal gland, eyeball, and parotid gland. IMPT was performed for all patients. The spot size was approximately 5-6 mm at the isocenter. The collimator margin was calculated by enlarging the maximum outline of the target from the beam's eye view and setting the margin to 6 mm. All plans were optimized with the same parameters. The mean of ROI-_D2% for the ipsilateral optic nerve was significantly reduced by 0.48 Gy, and the mean of ROI-_mean for the ipsilateral optic nerve was significantly reduced by 1.04 Gy. The mean of ROI-_mean to the optic chiasm was significantly reduced by 0.70 Gy. The dose to most OARs and the planning at risk volumes were also reduced. Compared with the plan involving IMPT without an MLC, in the dose plan involving IMPT using an MLC for maxillary sinus cancer, the dose to the optic nerve and optic chiasm were significantly reduced, as measured by the ROI-_D2% and the ROI-_mean. These findings demonstrate that the use of an MLC during IMPT for maxillary sinus cancer may be useful for preserving vision and preventing complications.
(キーワード): Brain Neoplasms / Comparative Effectiveness Research / 女性 (female) / Humans / 男性 (male) / Maxillary Sinus Neoplasms / Optic Nerve / Organs at Risk / Parotid Gland / Photons / Proton Therapy / Radiotherapy Dosage / Radiotherapy Planning, Computer-Assisted / Radiotherapy, Intensity-Modulated / 唾液腺 (salivary glands) / Tomography, X-Ray Computed
(出版サイトへのリンク): ● Publication site (DOI): 10.1186/s13014-019-1405-y
(文献検索サイトへのリンク): ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 31752928; ● Summary page in Scopus @ Elsevier: 2-s2.0-85075539563

(DOI: 10.1186/s13014-019-1405-y, PubMed: 31752928, Elsevier: Scopus) 冨永裕樹, 笈田将皇, 脇隆博, 井原弘貴, 金東村, 丹羽康江, 松田哲典, 黒田昌宏, 藤島護 :
前立腺癌高リスク症例に対する陽子線ラスタースキャニング法と強度変調回転放射線治療法との線量分布比較,
津山中央病院医学雑誌, 33, 1, 31-44, 2019年. 春名孝泰, 冨永裕樹, 山中将史, 多田光寿, 松田哲典, 石川勉, 弓狩一晃, 明比直樹, 井原弘貴, 金東村, 脇隆博, 丹羽康江, 藤島護 :
前立腺癌患者の陽子線治療におけるハイドロゲルスペーサ留置の有用性の検討,
津山中央病院医学雑誌, 33, 1, 45-54, 2019年. 冨永裕樹, 笈田将皇, 張智凱, 平井諒太, 山中将史, 多田光寿, 春名孝泰, 田村瑞希, 山本崇裕, 伊田和司, 綱澤勝之, 松田哲典, 黒田昌宏, 金東村, 脇隆博, 丹羽康江, 藤島護 :
前立腺患者の陽子線スポットスキャニングと従来法との線量分布比較,
津山中央病院医学雑誌, 32, 1, 41-52, 2018年.

MISC

冨永裕樹, 笈田将皇, Takahiro KATO :
呼吸同期陽子線ペンシルビームスキャニング法における4Dダイナミック線量の精度検証,
日本医学物理学会学術大会報文集, 125th, 44, 2023年. 冨永裕樹, 笈田将皇, Junya MIYATA, Yusuke SAKURAI, Takashi AKAGI :
陽子ペンシルビームスキャニングにおけるログファイルと市販の治療計画システムを使用した効率的な自動化された患者固有の品質保証,
日本医学物理学会学術大会報文集, 123rd, 73, 2022年. 春名孝泰, 笈田将皇, 冨永裕樹, Mitsutoshi TADA, Masashi YAMANAKA, Tetsunori MATSUDA, Masahiro KURODA :
陽子線ペンシルビームスキャニング法における異なる形状の電離箱のイオン再結合および極性効果補正係数,
日本医学物理学会学術大会報文集, 121st, 97, 2021年. 冨永裕樹, 笈田将皇, Junya MIYATA, Yusuke SAKURAI, Shuichi HARADA, Takashi AKAGI :
マルチリーフコリメータの有無による陽子ペンシルビーム走査における種々の最適化パラメータのための横方向ペナンブラ幅の改良,
日本医学物理学会学術大会報文集, 121st, 39, 2021年. 冨永裕樹, 笈田将皇, AKAGI Takshi, HARADA Shuichi, YAMANAKA Masashi, TADA Mitsutoshi, MATSUDA Tetsunori, KURODA Masahiro :
治療計画装置RayStationによる陽子線ペンシルビームスキャニング治療のビームコミッショニングに関する研究,
医学物理 Supplement, 39, 1, 2019年.

総説・解説: 研究者総覧に該当データはありませんでした。
講演・発表: 研究者総覧に該当データはありませんでした。

研究会・報告書: 研究者総覧に該当データはありませんでした。

特許: 研究者総覧に該当データはありませんでした。
作品: 研究者総覧に該当データはありませんでした。
補助金・競争的資金: 研究者総覧に該当データはありませんでした。

その他: 研究者総覧に該当データはありませんでした。

研究者総覧で最新データを確認する

2025年10月8日更新

専門分野・研究分野: ライフサイエンス (Life sciences) [放射線科学 (Radiology)]
所属学会・所属協会: 研究者総覧に該当データはありませんでした。
委員歴・役員歴: 研究者総覧に該当データはありませんでした。
受賞: 研究者総覧に該当データはありませんでした。
活動: 研究者総覧に該当データはありませんでした。

リサーチマップで最新データを確認する

2025年10月5日更新

更新

Ｊグローバル

Jグローバル最終確認日: JグローバルAPIで取得できませんでした。
氏名（漢字）: JグローバルAPIで取得できませんでした。
氏名（フリガナ）: JグローバルAPIで取得できませんでした。
氏名（英字）: JグローバルAPIで取得できませんでした。
所属機関: JグローバルAPIで取得できませんでした。

リサーチマップ

researchmap最終確認日: 2025/10/5 01:02
氏名（漢字）: 冨永裕樹
氏名（フリガナ）: トミナガユウキ
氏名（英字）: Tominaga Yuki
プロフィール: リサーチマップAPIで取得できませんでした。
登録日時: 2023/2/22 15:29
更新日時: 2025/10/1 16:16
アバター画像URI: https://researchmap.jp/2762656/avatar.jpg
ハンドル: リサーチマップAPIで取得できませんでした。
eメール: リサーチマップAPIで取得できませんでした。
eメール（その他）: リサーチマップAPIで取得できませんでした。
携帯メール: リサーチマップAPIで取得できませんでした。
性別: リサーチマップAPIで取得できませんでした。
没年月日: リサーチマップAPIで取得できませんでした。
所属ID: 0344000000
所属: 徳島大学大学院
部署: 医歯薬学研究部保健学域保健科学部門放射線科学系医用画像物理学分野
職名: 講師
学位: 博士（統合科学）
学位授与機関: 岡山大学
URL: リサーチマップAPIで取得できませんでした。
科研費研究者番号: リサーチマップAPIで取得できませんでした。
Google Analytics ID: リサーチマップAPIで取得できませんでした。
ORCID ID: リサーチマップAPIで取得できませんでした。
その他の所属ID: リサーチマップAPIで取得できませんでした。
その他の所属名: リサーチマップAPIで取得できませんでした。
その他の所属部署: リサーチマップAPIで取得できませんでした。
その他の所属職名: リサーチマップAPIで取得できませんでした。
最近のエントリー: リサーチマップAPIで取得できませんでした。
Read会員ID: リサーチマップAPIで取得できませんでした。
経歴
受賞: リサーチマップAPIで取得できませんでした。
Misc
論文
講演・口頭発表等
書籍等出版物
研究キーワード
研究分野
所属学協会
担当経験のある科目
その他: リサーチマップAPIで取得できませんでした。
Works: リサーチマップAPIで取得できませんでした。
特許: リサーチマップAPIで取得できませんでした。
学歴
委員歴
社会貢献活動: リサーチマップAPIで取得できませんでした。

更新

研究者番号: KAKEN APIで取得できませんでした。

所属（現在）: KAKEN APIで取得できませんでした。

所属（過去の研究課題 情報に基づく）*注記: KAKEN APIで取得できませんでした。

審査区分/研究分野: KAKEN APIで取得できませんでした。

キーワード: KAKEN APIで取得できませんでした。

研究課題研究成果共同研究者

「研究課題をさがす」で表示
テキスト（CSV）で出力

テキスト（CSV）で出力

注目研究はありません。

研究者を探す

冨永 裕樹

Ｊグローバル

リサーチマップ

冨永裕樹