研究実績 – 広島大学放射線腫瘍学医学物理グループ

2023年

- 1. D Kawahara, N Imano, R Nishioka, Y Nagata
    Image masking using convolutional networks improves performance classification of radiation pneumonitis for non-small cell lung cancer
    Physical and Engineering Sciences in Medicine, in press. (2023.3.28.)
  2. D Kawahara, A Saito, Y Nagata
    Physical and biological dosimetric margin according to prescription method for stereotactic body radiation therapy
    Journal of Radiation Research 64, 328-334 (2023). (2023.1.10.)
  3. D Kawahara, H Yoshimura, T Matsuura, A Saito, Y Nagata
    MRI image synthesis for fluid-attenuated inversion recovery and diffusion-weighted images with deep learning
    Physical and Engineering Sciences in Medicine 46, 313-323 (2023). (2023.1.30.)
  4. T Matsuura, D Kawahara, A Saito, K Yamada, S Ozawa, Y Nagata
    A synthesized gamma distribution-based patient-specific VMAT QA using a generative adversarial network
    Medical Physics 50, 2488-2498 (2023). (2023.1.7.)

2022年

- 1. S Tsunemine, S Ozawa, M Nakao, H Miura, A Saito, D Kawahara, Y Onishi, T Onishi, T Hashiguchi, Y Matsumoto, T Maruta, Y Murakami, Y Nagata
    Influence of different air CT numbers for IVDT on the dose distribution in TomoTherapy MVCT
    Journal of Applied Clinical Medical Physics 24, e13835 (2022). (2022.10.31.)
  2. T Matsuura, D Kawahara, A Saito, H Miura, K Yamada, S Ozawa, Y Nagata
    Predictive gamma passing rate of 3D detector array-based volumetric modulated arc therapy quality assurance for prostate cancer via deep learning
    Physical and Engineering Sciences in Medicine 45, 1073-1081 (2022). (2022.10.6.)
  3. D Kawahara, I Nishibuchi, M Kawamura, T Yoshida, I Koh, K Tomono, M Sekine, H Takahashi, Y Kikuchi, Y Kudo, Y Nagata
    Radiomic Analysis for Pretreatment Prediction of Recurrence Post-Radiotherapy in Cervical Squamous Cell Carcinoma Cancer
    Diagnostics 12, 2346 (2022). (2022.9.28.)
  4. D Kawahara, S Ozawa, A Saito, Y Nagata
    Image synthesis of effective atomic number images using a deep convolutional neural network-based generative adversarial network
    Reports of Practical Oncology & Radiotherapy 27, 848-855 (2022). (2022.9.12.)
  5. D Kawahara, A Saito, Y Nagata
    Improved biological dosimetric margin model for different PTV margins with stereotactic body radiation therapy in homogeneous and nonhomogeneous tumor regions
    Reports of Practical Oncology & Radiotherapy 27, 768-777 (2022). (2022.8.5.)
  6. T Wada, D Kawahara, Y Murakami, T Nakashima, Y Nagata
    Robust optimization of VMAT for prostate cancer accounting for geometric uncertainty
    Journal of Applied Clinical Medical Physics 23, e13738 (2022). (2022.8.3.)
  7. D Kawahara, Y Murakami, S Tani, Y Nagata
    A prediction model for pathological findings after neoadjuvant chemoradiotherapy for resectable locally advanced esophageal squamous cell carcinoma based on endoscopic images using deep learning
    British Journal of Radiology 95, 20210934 (2022). (2022.5.23.)
  8. M Nakao, M Hayata, S Ozawa, H Miura, K Yamada, D Kawahara, K Miki, T Nakashima, Y Ochi, S Tsuda, M Seido, Y Morimoto, A Kawakubo, H Nozaki, K Habara, Y Nagata
    Stoichiometric CT number calibration using three-parameter fit model for ion therapy
    Physica Medica 99, 22-30 (2022). (2022.5.20.)
  9. H Miura, Y Doi, M Nakao, S Ozawa, M Kenjo, Y Nagata
    Improved treatment robustness of postoperative breast cancer radiotherapy including supraclavicular nodes
    Physics and Imaging in Radiation Oncology 23, 153-156 (2022). (2022.8.13.)
  10. D Kawahara, A Saito, H Nakano, Y Nagata
    DNA strand breaks based on Monte Carlo simulation in and around the Lipiodol with flattening filter and flattening filter-free photon beams
    Reports of Practical Oncology & Radiotherapy 27, 392-400 (2022). (2022.7.29.)
  11. I Yamaguchi, S Ozawa
    Irradiator issues: Source, dose, and waste management
    Transfusion and Apheresis Science, in press. (2022.3.14.)
  12. D Kawahara,^† M Tsuneda, S Ozawa, H Okamoto, M Nakamura, T Nishio, Y Nagata
    Deep learning-based auto segmentation using generative adversarial network on magnetic resonance images obtained for head and neck cancer patients
    Journal of Applied Clinical Medical Physics, in press. (2022.3.9.)
  13. D Kawahara,^† M Tsuneda, S Ozawa, H Okamoto, M Nakamura, T Nishio, A Saito, Y Nagata
    Stepwise deep neural network (stepwise-net) for head and neck auto-segmentation on CT images
    Computers in Biology and Medicine 143, 105295 (2022). (2022.2.6.)
  14. A Ohashi,^† T Nishio, A Saito, D Hashimoto, H Maekawa, Y Murakami, S Ozawa, M Suitani, M Tsuneda, H Watanabe, K Ikenaga, Y Nagata
    Baseline drift vector of multiple points on body surface using a near-infrared camera
    Physical and Engineering Sciences in Medicine 45, 143-155 (2022). (2022.1.4.)
  15. H Miura,^† S Ozawa, M Nakao, Y Doi, K Kubo, M Kenjo, Y Nagata
    Impact on liver position under breath-hold by computed tomography contrast agents in stereotactic body radiotherapy of liver cancer
    Reports of Practical Oncology & Radiotherapy 26, 87015 (2022). (2021.12.10.)

2021年

- 1. D Kawahara,^† Y Nagata, Y Watanabe
    Improved cellular automata model shows that indirect apoptotic cell death due to vascular damage enhances the local control of tumors by single fraction high-dose irradiation
    Biomedical Physics & Engineering Express 8, 015028 (2021). (2021.12.31.)
  2. N Imano,^† T Kimura, D Kawahara, R Nishioka, W Fukumoto, R Kawano, K Kubo, T Katsuta, Y Takeuchi, I Nishibuchi, Y Murakami, Y Horimasu, T Masuda, K Fujitaka, N Hattori, Y Nagata
    Potential benefits of volumetric modulated arc therapy to reduce the incidence of ≥ grade 2 radiation pneumonitis in radiotherapy for locally advanced non-small cell lung cancer patients
    Japanese Journal of Clinical Oncology 51, 1729–1735 (2021). (2021.10.8.)
  3. H Miura,^† M Nakao, Y Doi, S Ozawa, M Kenjo, Y Nagata
    Treatment planning comparison between dynamic wave arc and volumetric modulated arc therapies for prostate-cancer treatment
    Medical Dosimetry 47, 48-53 (2021). (2021.9.16.)
  4. R Nakamoto, M Ito,^† A Saito, S Shimoura
    Extended Migdal-Watson formula to evaluate background strength in binary breakup reactions
    Physical Review C104, 034602 (2021). (2021.9.1.)
  5. D Kawahara,^† N Imano, R Nishioka, K Ogawa, T Kimura, T Nakashima, H Iwamoto, K Fujitaka, N Hattori, Y Nagata
    Prediction of radiation pneumonitis after definitive radiotherapy for locally advanced non-small cell lung cancer using multi-region radiomics analysis
    Scientific Reports 11, 16232 (2021). (2021.8.10.)
  6. D Kawahara,^† Y Murakami, S Tani, Y Nagata
    A prediction model for degree of differentiation for resectable locally advanced esophageal squamous cell carcinoma based on CT images using radiomics and machine-learning
    British Journal of Radiology 94, 20210525 (2021). (2021.7.8.)
  7. Y Murakami,^† D Kawahara,^† S Tani, K Kubo, T Katsuta, N Imano, Y Takeuchi, I Nishibuchi, A Saito, Y Nagata
    Predicting the local response of esophageal squamous cell carcinoma to neoadjuvant chemoradiotherapy by radiomics with a machine learning method using ¹⁸F-FDG PET images
    Diagnostics 7, 1049 (2021). (2021.6.7.)
  8. K Kubo,^† M Kenjo, H Kawabata, K Wadasaki, M Kajiwara, Y Doi, M Nakao, H Miura, S Ozawa, Y Nagata
    Hydrogel spacer shrinkage during external-beam radiation therapy following low-dose-rate brachytherapy for high-risk prostate cancer: a case series
    Journal of Medical Case Reports 15, 296 (2021). (2021.5.26.)
  9. H Miura,^† K Hioki, S Ozawa, K Kanemoto, M Nakao, Y Doi, M Kenjo, Y Nagata
    Uncertainty in the positioning of patients receiving treatment for brain metastases and wearing surgical mask underneath thermoplastic mask during COVID-19 crisis
    Journal of Applied Clinical Medical Physics 22, 274–280 (2021). (2021.5.24.)
  10. H Miura,^† S Ozawa, M Nakao, Y Doi, Y Adachi, M Kenjo, Y Nagata
    Investigation of interfractional variation in lung tumor position under expiratory-phase breath hold using cone-beam computed tomography in stereotactic body radiation therapy
    Medical Dosimetry, in press. (2021.5.11.)
  11. H Masuda, D Kawahara,^† A Saito, T Kimura, S Ozawa, T Nakashima, Y Nagata
    Reduction of margin to compensate the respiratory tumor motion by the analysis of dosimetric internal target volume in lung SBRT with nonuniform volume prescription method
    Medical Physics 48, 3200-3207 (2021). (2021.3.31.)
  12. H Nakano,^† D Kawahara, S Tanabe, S Utsunomiya, T Takizawa, M Sakai, T Nakano, A Ohta, M Kaidu, H Ishikawa
    Calculated relative biological effectiveness (RBE) for initial DNA double-strand breaks (DSB) from flattening filter and flattening filter-free 6 MV X-ray fields
    BJR Open 3, 20200072 (2021). (2021.3.8.)
  13. D Kawahara,^† Y Nagata
    T1-weighted and T2-weighted MRI image synthesis with Convolutional Generative Adversarial Networks
    Reports of Practical Oncology & Radiotherapy 26, 35–42 (2021). (2021.2.25.)
  14. D Kawahara,^† S Ozawa, T Kimura, Y Nagata
    Image synthesis of monochromatic energy CT image in dual-energy CT using a kilovoltage CT with deep convolutional generative adversarial networks
    Journal of Applied Clinical Medical Physics 22, 184–192 (2021). (2021.2.18.)
  15. D Kawahara, X Tang, CK Lee, Y Nagata, Y Watanabe^†
    Predicting the local response of metastatic brain tumor to Gamma Knife radiosurgery by radiomics with a machine learning method
    Frontiers in Oncology 10, 569461 (2021). (2021.1.11.)
  16. M Sakai, H Nakano, D Kawahara, S Tanabe, T Takizawa, A Narita, T Yamada, H Sakai, M Ueda, R Sasamoto, M Kaidu, H Aoyama, H Ishikawa, S Utsunomiya^†
    Detecting MLC modeling errors using radiomics-based machine learning in patient-specific QA with an EPID for intensity-modulated radiation therapy
    Medical Physics 48, 991-1002 (2021). (2020.12.31.)
  17. D Kawahara,^† H Nakano, A Saito, Y Ochi, Y Nagata
    Formulation of objective indices to quantify machine failure risk analysis for interruptions in radiotherapy
    Journal of Applied Clinical Medical Physics 22, 165-173 (2021). (2020.12.16.)
  18. T Kimura, A Takeda, N Sanuki, K Ariyoshi, T Yamaguchi, T Imagumbai, N Katoh, T Eriguchi, Y Oku, S Ozawa, Y Tsurugai, M Kokubo, S Shimizu, S Ishikura^†
    Multicenter prospective study of stereotactic body radiotherapy for previously untreated solitary primary hepatocellular carcinoma: The STRSPH study
    Hepatology Research 51, 461–471 (2021). (2020.11.20.)
  19. Y Ando,^† K Miki, J Araki, M Tsuneda, H Kiriu, T Nishio, Y Nagata
    Verification system for intensity-modulated radiation therapy with scintillator
    Physical and Engineering Sciences in Medicine 44, 9–21 (2021). (2020.11.18.)
  20. D Kawahara,^† A Saito, S Ozawa, Y Nagata
    Image synthesis with deep convolutional generative adversarial networks for material decomposition in dual-energy CT from a kilovoltage CT
    Computers in Biology and Medicine 128, 104111 (2021). (2020.11.17.)

2020年

- 1. N Imano,^† Y Murakami, K Kubo, D Kawahara, Y Takeuchi, I Nishibuchi, T Kimura, M Kochi, Y Takakura, W Shimizu, H Egi, S Uegami, H Ohge, S Takahashi, H Ohdan, Y Nagata
    Efficacy and tolerability of preoperative chemoradiotherapy with S-1 alone for locally advanced rectal cancer
    Journal of Radiation Research 62, 300-308 (2020). (2020.12.21.)
  2. H Nakano,^† D Kawahara, S Tanabe, S Utsunomiya, T Takizawa, M Sakai, H Saito, A Ohta, M Kaidu, H Ishikawa
    Radiobiological effects of the interruption time with Monte Carlo Simulation on multiple fields in photon beams
    Journal of Applied Clinical Medical Physics 21, 288-294 (2020). (2020.12.3.)
  3. K Miki,^† M Kusters, T Nakashima, A Saito, D Kawahara, I Nishibuchi, T Kimura, Y Murakami, Y Nagata
    Evaluation of optimization workflow using custom-made planning through predicted dose distribution for head and neck tumor treatment
    Physica Medica 80, 167-174 (2020). (2020.11.11.)
  4. T Nishio,^† M Nakamura, H Okamoto, S Kito, T Minemura, S Ozawa, Y Kumazaki, M Ishikawa, N Tohyama, M Kurooka, T Nakashima, H Shimizu, R Suzuki, S Ishikura, Y Nishimura
    An overview of the medical-physics-related verification system for radiotherapy multicenter clinical trials by the Medical Physics Working Group in the Japan Clinical Oncology Group–Radiation Therapy Study Group
    Journal of Radiation Research 61, 999-1008 (2020). (2020.9.29.)
  5. Y Doi,^† M Nakao, H Miura, S Ozawa, M Kenjo, Y Nagata
    Hybrid volumetric-modulated arc therapy for postoperative breast cancer including regional lymph nodes: the advantage of dosimetric data and safety of toxicities
    Journal of Radiation Research 61, 474-754 (2020). (2020.8.12.)
  6. K Kubo,^† Y Murakami, N Imano, Y Takeuchi, I Nishibuchi, T Kimura, D Kawahara, K Miki, A Saito, T Nakashima, T Hamamoto, T Ueda, S Takeno, Y Nagata
    A single institution’s experience of definitive radiotherapy using volumetric-modulated arc therapy for hypopharyngeal cancers
    Anticancer Research 40, 4183-4190 (2020). (8 pages) (2020.7.1.)
  7. T Kimura,^† A Takeda, Y Tsurugai, R Kawano, Y Doi, Y Oku, K Hioki, H Miura, Y Nagata
    A Multi-Institutional Retrospective Study of Repeated Stereotactic Body Radiation Therapy for Intrahepatic Recurrent Hepatocellular Carcinoma
    International Journal of Radiation Oncology * Biology * Physics 108, 1265-1275 (2020). (2020.7.23.)
  8. K Kubo,^† Y Murakami, M Kenjo, N Imano, Y Takeuchi, I Nishibuchi, T Kimura, D Kawahara, T Ueda, S Takeno, Y Nagata
    Long-term outcomes of induction chemotherapy followed by chemoradiotherapy using volumetric-modulated arc therapy as an organ preservation approach in patients with stage IVA-B oropharyngeal or hypopharyngeal cancers
    Journal of Radiation Research 61, 554–562 (2020). (2020.6.17.)
  9. D Kawahara,^† H Nakano, A Saito, S Ozawa, Y Nagata
    Dose compensation based on biological effectiveness due to interruption time for photon radiation therapy
    British Journal of Radiology 93, 1111 (2020). (2020.5.7.)
  10. H Miura,^† S Ozawa, Y Doi, M Nakao, K Kubo, M Kenjo, Y Nagata
    Effectiveness of robust optimization in volumetric modulated arc therapy using 6 and 10 MV flattening filter-free beam therapy planning for lung stereotactic body radiation therapy with a breath-hold technique
    Journal of Radiation Research 61, 575–585 (2020). (2020.5.5.)
  11. 國本陽英,^† 三浦英治, 宮沢正則, 早田将博, 松浦貴明, 小澤修一, 山田聖, 永田靖
    多方向スキャンデータの平均補正係数を使用したフラットベッドスキャナ由来のラジオクロミックフィルム線量測定の不均一性の改善
    日本放射線技術学会雑誌 76, 375–384 (2020). (2020.4.20.)
  12. D Kawahara,^† L Wu, Y Watanabe
    Optimization of irradiation interval for fractionated stereotactic radiosurgery by a cellular automata model with reoxygenation effects
    Physics in Medicine & Biology 65, 085008 (2020). (2020.4.20.)
  13. H Miura,^† S Ozawa, H Kusaba, Y Doi, M Kenjo, K Yamada, Y Nagata
    Characterization of robust optimization for VMAT plan for liver cancer
    Reports of Practical Oncology & Radiotherapy 25, 376–381 (2020). (2020.4.15.)
  14. K Yogo,^† Y Tatsuno, H Souda, A Matsumura, M Tsuneda, Y Hirano, H Ishiyama, A Saito, S Ozawa, Y Nagata, T Nakano, K Hayakawa, T Kanai
    Scintillator screen for measuring low-dose halo in scanning carbon-ion therapy
    Radiation Measurements 133, 106299 (2020). (2020.3.9.)
  15. D Kawahara,^† A Saito, S Ozawa, T Shiinoki, T Kimura, K Tsubouchi, Y Nagata
    Assessment of biological dosimetric margin for stereotactic body radiation therapy
    Journal of Applied Clinical Medical Physics 21, 31-41 (2020). (2020.3.6.)
  16. D Kawahara,^† S Ozawa, K Yokomachi, T Higaki, T Shiinoki, C Fujioka, A Saito, K Miki, T Kimura, Y Murakami, K Awai, Y Nagata
    Evaluation of metal artifact techniques with same contrast scale for different commercially available dual-energy computed tomography scanners
    Physical and Engineering Sciences in Medicine 43, 539-546 (2020). (8 pages) (2020.2.28)
  17. K Yogo,^† A Matsushita, Y Tatsuno, T Shimo, S Hirota, M Nozawa, S Ozawa, H Ishiyama, H Yasuda, Y Nagata, K Hayakawa
    Imaging Cherenkov emission for quality assurance of high-dose-rate brachytherapy
    Scientific Reports 10, 3572 (2020). (2020.2.27.)
  18. Y Takeuchi,^† Y Murakami, T Kameoka, M Ochi, N Imano, I Takahashi, I Nishibuchi, T Kimura, D Kawahara, A Saito, Y Nagata
    Analysis of cardiac toxicity after definitive chemoradiotherapy for esophageal cancer using a biological dose-volume histogram
    Journal of Radiation Research 61, 298-306 (2020). (2020.2.13.)
  19. D Kawahara,^† S Ozawa, K Yokomachi, C Fujioka, T Kimura, K Awai, Y Nagata
    Synthesized effective atomic numbers for commercially available dual-energy CT
    Reports of Practical Oncology & Radiotherapy 25, 692–697 (2020). (2020.2.21.)
  20. H Miura,^† S Ozawa, M Nakao, Y Doi, K Kubo, M Kenjo, Y Nagata
    Evaluation of interbreath-hold lung tumor position reproducibility with vector volume histogram using the breath-hold technique
    Medical Dosimetry 45, 252–255 (2020). (2020.2.13.)
  21. M Nakao,^† S Ozawa, H Miura, K Yamada, K Habara, M Hayata, H Kusaba, D Kawahara, K Miki, T Nakashima, Y Ochi, S Tsuda, M Seido, Y Morimoto, A Kawakubo, H Nozaki, Y Nagata
    Development of a CT number calibration audit phantom in photon radiation therapy: A pilot study
    Medical Physics 47, 1509–1522 (2020). (2020.2.5.)
  22. E Shiba, A Saito,^† M Furumi, D Kawahara, K Miki, Y Murakami, T Ohguri, S Ozawa, M Tsuneda, K Yahara, T Nishio, Y Korogi, Y Nagata
    Predictive gamma passing rate for three‐dimensional dose verification with finite detector elements via improved dose uncertainty potential accumulation model
    Medical Physics 47, 1349-1356 (2020). (2020.1.6.)

2019年

- 1. K Yogo,^† Y Hirano, Y Tatsuno, M Tsuneda, H Ishiyama, K Hayakawa, H Souda, A Matsumura, T Nakano, T Kanai, S Ozawa, A Saito, Y Nagata
    Scintillator screen for measuring dose distribution in scanned carbon-ion therapy
    Radiation Measurements 129, 106207 (2019). (2019.10.28.)
  2. D Kawahara,^† S Ozawa, H Nakano, K Kubo, T Shiinoki, T Kimura, Y Nagata
    Biological dose-enhancement analysis with Monte Carlo simulation for Lipiodol for photon beams
    Reports of Practical Oncology & Radiotherapy 24, 681–687 (2019). (2019.11.8.)
  3. K Kubo,^† M Kenjo, Y Doi, M Nakao, H Miura, S Ozawa, Y Nagata
    MRI appearance change during stereotactic radiotherapy for large brain metastases and importance of treatment plan modification during treatment period
    Japanese Journal of Radiology 37, 850–859 (2019). (2019.10.15.)
  4. D Kawahara,^† S Ozawa, K Yokomachi, T Higaki, T Shiinoki, Y Ohno, Y Murakami, K Awai, Y Nagata
    Evaluation of raw-data-based and calculated electron density for contrast media with a dual-energy CT technique
    Reports of Practical Oncology & Radiotherapy 24, 499–506 (2019). (2019.8.20.)
  5. D Kawahara,^† S Ozawa, K Yokomachi, T Higaki, T Shiinoki, A Saito, T Kimura, I Nishibuchi, I Takahashi, Y Takeuchi, N Imano, K Kubo, M Mori, Y Ohno, Y Murakami, Y Nagata
    Metal artifact reduction techniques for single energy CT and dual-energy CT with various metal materials
    BJR Open 1, bjro.20180045 (2019). (2019.7.9.)
  6. H Miura,^† S Ozawa, Y Doi, M Nakao, K, Ohnishi, M Kenjo, Y Nagata
    Automatic gas detection in prostate cancer patients during image-guided radiation therapy using a deep convolutional neural network
    Physica Medica 64, 24–28 (2019). (2019.6.21.)
  7. D Kawahara,^† S Ozawa, K Yokomachi, T Higaki, C Fujioka, M Mori, Y Nagata
    Improving automatic contrast agent extraction system using monochromatic CT number
    Physical and Engineering Sciences in Medicine 42, 819–826 (2019). (2019.5.20.)
  8. M Nakao,^† S Ozawa, K Yogo, H Miura, K Yamada, F Hosono, M Hayata, K Miki, T Nakashima, Y Ochi, D Kawahara, Y Morimoto, T Yoshizaki, H Nozaki, K Habara, Y Nagata
    Tolerance levels of mass density for CT number calibration in photon radiation therapy
    Journal of Applied Clinical Medical Physics 20, 45–52 (2019). (2019.5.13.)
  9. Y Kaneyasu,^† I Koh, H Fujiwara, E Hirata, Y Kudo, K Arihiro, N Miharu, T Nakagawa, I Takahashi, Y Takeuchi, N Imano, I Nishibuchi, T Nakashima, D Kawahara, Y Ohno, Y Nagata
    Concurrent chemoradiotherapy for locally advanced squamous cell carcinoma of the cervix in a uterus didelphys with vaginal septum
    Journal of Contemporary Brachytherapy 11, 180-188 (2019). (2019.4.29.)
  10. CAB Gonzales, H Yasuda,^† S Hirota, K Miki, A Saito, JE Taño, Y Nagata
    Investigation of the applicability of the ESR nail dosimetry for assessment of accidental exposure in medical facilities
    Radiation Measurements 124, 91-97 (2019). (2019.4.4.)
  11. D Kawahara,^† S Ozawa, T Kimura, A Saito, T Nakashima, Y Ohno, Y Murakami, Y Nagata, T Shiinoki
    Photon and electron backscatter dose and energy spectrum analysis around Lipiodol using flattened and unflattened beams
    Journal of Applied Clinical Medical Physics 20, 178-183 (2019). (2019.3.18.)
  12. H Miura,^† S Ozawa, T Enosaki, F Hosono, K Yamada, Y Nagata
    Effect of image quality on correlation modeling error using a fiducial marker in a gimbaled linear accelerator
    Reports of Practical Oncology & Radiotherapy 24, 233–238 (2019). (2019.2.25.)
  13. Y Ochi, A Saito,^† D Kawahara, T Suzuki, M Tsuneda, S Tanaka, T Nishio, S Ozawa, Y Murakami, Y Nagata
    A novel risk analysis of clinical reference dosimetry based on failure mode and effects analysis
    Physica Medica 58, 59–65 (2019). (2019.1.29.)
  14. H Miura,^† Y Doi, S Ozawa, M Nakao, K Ohnishi, M Kenjo, Y Nagata
    Volumetric modulated arc therapy with robust optimization for larynx cancer
    Physica Medica 58, 54–58 (2019). (2019.1.25.)
  15. A Saito,^† A Ohashi, T Nishio, D Hashimoto, H Maekawa, Y Murakami, S Ozawa, M Suitani, M Tsuneda, K Ikenaga, Y Nagata
    Automatic calibration of an arbitrarily-set near-infrared camera for patient surface respiratory monitoring
    Medical Physics 46, 1163-1174 (2019). (2019.1.8.)
  16. K Miki,^† K Hioki, T Nakashima, A Saito, Y Murakami, T Kimura, I Nishibuchi, Y Nagata
    Development of geometrically ideal dose distribution as a reference for treatment planning in VMAT using filtered back-projection method
    Physica Medica 57, 115-122 (2019). (2019.1.4.)
  17. E Shiba, A Saito,^† M Furumi, Y Murakami, T Ohguri, M Tsuneda, K Yahara, T Nishio, Y Korogi, Y Nagata
    Predictive gamma passing rate by dose uncertainty potential accumulation model
    Medical Physics 46, 999-1005 (2019). (2018.12.28. Selected for “Editor’s Choice”.)

2018年

- 1. H Nakano,^† D Kawahara, K Ono, Y Akagi, Y Hirokawa
    Effect of dose-delivery time for flattened and flattening filter-free photon beams based on microdosimetric kinetic model
    PLoS ONE 13, e0206673 (2018). (2018.11.21.)
  2. K Miki,^† A Saito, T Nakashima, Y Murakami, T Kimura, I Nishibuchi, Y Nagata
    Evaluation of optimization workflow using design of experiment (DoE) for various field configurations in volumetric-modulated arc therapy
    Physica Medica 54, 34–41 (2018). (2018.9.27.)
  3. Y Kumazaki,^† S Ozawa, M Nakamura, S Kito, T Minemura, H Tachibana, T Nishio, S Ishikura, Y Nishimura
    An end-to-end postal audit test to examine the coincidence between the imaging isocenter and treatment beam isocenter of the IGRT linac system for Japan Clinical Oncology Group (JCOG) clinical trials
    Physica Medica 53, 145–152 (2018). (2018.9.11.)
  4. YH Lin, LX Hong, MA Hunt, SL Berry^†
    Use of a constrained hierarchical optimization dataset enhances knowledge-based planning as a quality assurance tool for prostate bed irradiation
    Medical Physics 45, 4364–4369 (2018). (2018.8.31.)
  5. D Kawahara,^† S Ozawa, S Tanaka, K Yokomachi, T Higaki, A Saito, K Miki, C Fujioka, Y Ohno, T Kimura, Y Murakami, Y Nagata
    Automatic contrast medium extraction system using electron density data with dual-energy CT
    British Journal of Radiology 91, 20180396 (2018). (2018.7.9.)
  6. 渡邉浩, 小澤修一,^† 大橋厚之, 池永弘二, 三木健太朗, 齋藤明登, 西尾禎治, 村上祐司, 永田靖
    胸部CBCT 画像を用いた肺密度の上書きによる線量再計算法の検討
    日本放射線技術学会雑誌 74, 465–472 (2018). (2018.5.20.)
  7. H Miura,^† S Ozawa, T Okazue, A Kawakubo, K Yamada, Y Nagata
    Image quality and absorbed dose comparison of single- and dual-source cone-beam computed tomography
    Journal of Applied Clinical Medical Physics 19, 360–366 (2018). (2018.4.17.)
  8. M Tsuneda, T Nishio,^† A Saito, S Tanaka, T Suzuki, D Kawahara, K Matsushita, A Nishio, S Ozawa, K Karasawa, Y Nagata
    A novel verification method using a plastic scintillator imaging system for assessment of gantry sag in radiotherapy
    Medical Physics 45, 2411–2424 (2018). (2018.4.16.);
    M Tsuneda, T Nishio,^† A Saito, S Tanaka, T Suzuki, D Kawahara, K Matsushita, A Nishio, S Ozawa, K Karasawa, Y Nagata
    Erratum: “A novel verification method using a plastic scintillator imagining system for assessment of gantry sag in radiotherapy” [Med. Phys. 45(6), 2411‐2424 (2018)]
    Medical Physics 45, 4322 (2018). (2018.5.9.)
  9. K Fukata,^† S Sugimoto, C Kurokawa, A Saito, T Inoue, K Sasai
    Output factor determination based on Monte Carlo simulation for small cone field in 10-MV photon beam
    Radiological Physics and Technology 11, 192–201 (2018). (2018.4.4.)
  10. T Shiinoki,^† R Onizuka, D Kawahara, T Suzuki, Y Yuasa, K Fujimoto, T Uehara, H Hanazawa, K Shibuya
    Estimation of patient-specific imaging dose for real-time tumour monitoring in lung patients during respiratory-gated radiotherapy
    Physics in Medicine & Biology 63, 065016 (2018). (2018.3.21)
  11. 榎﨑翼,^† 三浦英治, 津田信太朗, 川久保淳, 早田将博, 小澤修一, 山田聖, 永田靖
    ディジタルカメラを用いた呼吸波形の変化による動体追尾照射精度の検証
    日本放射線技術学会雑誌 74, 262–269 (2018). (2018.3.20.)
  12. H Miura,^† S Ozawa, T Matsuura, A Kawakubo, F Hosono, K Yamada, Y Nagata
    4D modeling in a gimbaled linear accelerator by using gold anchor markers
    Reports of Practical Oncology & Radiotherapy 23, 183–188 (2018). (2018.3.18.)
  13. D Kawahara,^† H Nakano, S Ozawa, A Saito, T Kimura, T Suzuki, M Tsuneda, S Tanaka, Y Ohno, Y Murakami, Y Nagata
    Relative biological effectiveness study of Lipiodol based on microdosimetric-kinetic model
    Physica Medica 46, 89–95 (2018). (2018.3.5.)
  14. D Kawahara,^† S Ozawa, A Saito, T Kimura, T Suzuki, M Tsuneda, S Tanaka, T Nakashima, Y Ohno, Y Murakami, Y Nagata
    Effect of secondary electron generation on dose enhancement in Lipiodol with and without flattening filter
    Journal of Applied Clinical Medical Physics 19, 211–217 (2018). (2018.2.15.)
  15. D Kawahara,^† S Ozawa, T Nakashima, S Tsuda, Y Ochi, T Okumura, H Masuda, K Hioki, T Suzuki, Y Ohno, T Kimura, Y Murakami, Y Nagata
    Interfractional diaphragm changes during breath-holding in stereotactic body radiotherapy for liver cancer
    Reports of Practical Oncology & Radiotherapy 23, 84–90 (2018). (2018.2.10.)
  16. D Kawahara,^† S Ozawa, A Saito, T Kimura, T Suzuki, M Tsuneda, S Tanaka, K Hioki, T Nakashima, Y Ohno, Y Murakami, Y Nagata
    Energy spectrum and dose enhancement due to the depth of the Lipiodol position using flattened and unflattened beams
    Reports of Practical Oncology and Radiotherapy 23, 50–56 (2018). (2018.1.12.)
  17. D Kawahara,^† S Ozawa, K Yokomachi, S Tanaka, T Higaki, C Fujioka, T Suzuki, M Tsuneda, T Nakashima, Y Ohno, Y Nagata
    Accuracy of the raw-data-based effective atomic numbers and monochromatic CT numbers for contrast medium with a dual-energy CT technique
    British Journal of Radiology 91, 20170524 (2018). (2017.12.5.)

2017年

- 1. M Nakao,^† S Ozawa, K Yamada, K Yogo, F Hosono, M Hayata, A Saito, K Miki, T Nakashima, Y Ochi, D Kawahara, Y Morimoto, T Yoshizawa, H Nozaki, K Habara, Y Nagata
    Tolerance levels of CT number to electron density table for photon beam in radiotherapy treatment planning system
    Journal of Applied Clinical Medical Physics 19, 271–275 (2017). (2017.11.20.)
  2. H Miura,^† S Ozawa, T Matsuura, K Yamada, Y Nagata
    Proposed patient motion monitoring system using feature point tracking with a web camera
    Physical and Engineering Sciences in Medicine 40, 939–942 (2017). (2017.10.6.)
  3. H Miura,^† S Ozawa, M Nakao, K Furukawa, Y Doi, H Kawabata, M Kenjo, Y Nagata
    Impact of deformable image registration accuracy on thoracic images with different regularization weight parameter settings
    Physica Medica 42, 108–111 (2017). (2017.9.15.)
  4. H Miura,^† S Ozawa, Y Nagata
    Efficacy of robust optimization plan with partial-arc VMAT for photon volumetric-modulated arc therapy: A phantom study
    Journal of Applied Clinical Medical Physics 18, 97–103 (2017). (2017.7.10.)
  5. YH Lin, S Ozawa,^† H Miura, K Yogo, T Nakashima, K Miki, S Tsuda, Y Ochi, D Kawahara, T Kimura, A Saito, Y Nagata
    Split-VMAT technique to control the expiratory breath-hold time in liver stereotactic body radiation therapy
    Physica Medica 40, 17–23 (2017). (2017.7.13.)
  6. H Miura,^† S Ozawa, M Hayata, S Tsuda, K Yamada, Y Nagata
    Effect of tumor amplitude and frequency on 4D modeling of Vero4DRT system
    Reports of Practical Oncology & Radiotherapy 22, 290–294 (2017). (2017.5.5.)
  7. H Miura,^† S Ozawa, M Hayata, S Tsuda, T Enosaki, K Yamada, Y Nagata
    Evaluation of cone-beam computed tomography image quality assurance for Vero4DRT system
    Reports of Practical Oncology & Radiotherapy 22, 258–263 (2017). (2017.4.25.)
  8. 北里裕美子, 久家教幸,^† 尻枝勝敏, 圓崎将大, 中口裕二, 下東吉信, 川崎年久, 豊田雅彦, 河原大輔, 荒木不次男, 川村慎二
    画像誘導放射線治療 (IGRT) における CBCT の吸収線量評価 ―施設,装置間比較―
    日本放射線技術学会雑誌 73, 309–316 (2017). (2017.4.20.)
  9. U Tsegmed, T Kimura,^† T Nakashima, Y Nakamura, T Higaki, N Imano, Y Doi, M Kenjo, S Ozawa, Y Murakami, K Awai, Y Nagata
    Functional image-guided stereotactic body radiation therapy planning for patients with hepatocellular carcinoma
    Medical Dosimetry 42, 97–103 (2017). (2017.4.19.)
  10. D Kawahara,^† S Ozawa, A Saito, T Nishio, T Kimura, T Suzuki, K Hioki, T Nakashima, Y Ohno, Y Murakami, Y Nagata
    Dosimetric impact of Lipiodol in stereotactic body radiation therapy on liver after trans-arterial chemoembolization
    Medical Physics 44, 342–348 (2017). (2017.1.19.)
  11. D Kawahara, S Ozawa,^† T Kimura, A Saito, T Nishio, T Nakashima, Y Ohno, Y Murakami, Y Nagata
    Marginal prescription equivalent to the isocenter prescription in lung stereotactic body radiotherapy: preliminary study for Japan Clinical Oncology Group trial (JCOG1408)
    Journal of Radiation Research 58, 149–154 (2016). (2017.1.23.)
  12. T Kimura,^† Y Nagata, J Eba, S Ozawa, S Ishikura, T Shibata, Y Ito, M Hiraoka, Y Nishimura, Radiation Oncology Study Group of the Japan Clinical Oncology Group
    A randomized Phase III trial of comparing two dose-fractionations stereotactic body radiotherapy (SBRT) for medically inoperable Stage IA non-small cell lung cancer or small lung lesions clinically diagnosed as primary lung cancer: Japan Clinical Oncology Group Study JCOG1408 (J-SBRT trial)
    Japanese Journal of Clinical Oncology 47, 277–281 (2017). (2017.1.10.)
  13. H Miura,^† S Ozawa, T Enosaki, A Kawakubo, F Hosono, K Yamada, Y Nagata
    Quality assurance of a gimbaled head swing verification using feature point tracking
    Journal of Applied Clinical Medical Physics 18, 49–52 (2017). (2016.11.21.)
  14. D Kawahara,^† S Ozawa, T Nakashima, M Aita, S Tsuda, Y Ochi, T Okumura, H Masuda, Y Ohno, Y Murakami, Y Nagata
    Evaluation of beam modeling for small fields using a flattening filter-free beam
    Radiological Physics and Technology 10, 33–40 (2017). (2016.6.21.)

2016年

- 1. D Kawahara,^† S Ozawa, T Nakashima, T Suzuki, M Tsuneda, S Tanaka, Y Ohno, Y Murakami, Y Nagata
    Absorbed dose and image quality of Varian TrueBeam CBCT compared with OBI CBCT
    Physica Medica 32, 1628–1633 (2016). (2016.12.4.)
  2. H Miura,^† S Ozawa, H Kawabata, Y Doi, M Kenjo, K Furukawa, M Nakao, Y Nagata
    Method of evaluating respiratory induced organ motion by vector volume histogram
    Physica Medica 32, 1570–1574 (2016). (2016.11.23.)
  3. H Miura,^† S Ozawa, F Hosono, N Sumida, T Okazue, K Yamada, Y Nagata
    Gafchromic EBT-XD film: Dosimetry characterization in high-dose, volumetric-modulated arc therapy
    Journal of Applied Clinical Medical Physics 17, 312–322 (2016). (2016.11.8.)
  4. H Miura,^† S Ozawa, M Hayata, S Tsuda, K Yamada, Y Nagata
    Simple quality assurance method of dynamic tumor tracking with the gimbaled linac system using a light field
    Journal of Applied Clinical Medical Physics 17, 177–183 (2016). (2016.9.8.)
  5. S Tanaka, T Nishio,^† K Matsushita, M Tsuneda, S Kabuki, M Uesaka
    Development of proton CT imaging system using plastic scintillator and CCD camera
    Physics in Medicine & Biology 61, 4156–4167 (2016). (2016.5.18.)
  6. D Kawahara, S Ozawa,^† Y Murakami, T Nakashima, M Aita, S Tsuda, Y Ochi, T Okumura, H Masuda, Y Ohno, Y Nagata
    Impact of reduction of flux overlap region on kilovoltage cone-beam computed tomography image quality and patients’ exposure dose
    Reports of Practical Oncology and Radiotherapy 21, 460–465 (2016). (2016.5.16.)
  7. D Kawahara,^† S Ozawa, T Kimura, T Nakashima, M Aita, S Tsuda, Y Ochi, T Okumura, H Masuda, Y Ohno, Y Murakami, Y Nagata
    Availability of applying diaphragm matching with the breath-holding technique in stereotactic body radiation therapy for liver tumors
    Physica Medica 32, 557–561 (2016). (2016.3.21.)

2015年

- 1. K Matsushita, T Nishio,^† S Tanaka, M Tsuneda, A Sugiura, K Ieki
    Measurement of proton-induced target fragmentation cross sections in carbon
    Nuclear Physics A946, 104–116 (2015). (2015.11.27.)
  2. T Kimura,^† Y Doi, T Nakashima, N Imano, H Kawabata, I Nishibuchi, T Okabe, M Kenjo, S Ozawa, Y Murakami, Y Nagata
    Combined Ventilation and Perfusion Imaging Correlates With the Dosimetric Parameters of Radiation Pneumonitis in Radiation Therapy Planning for Lung Cancer
    International Journal of Radiation Oncology * Biology * Physics 93, 778–787 (2015). (2015.8.19.)
  3. T Kimura,^† Y Doi, T Nakashima, N Imano, T Katsuta, S Takahashi, M Kenjo, S Ozawa, Y Murakami, Y Nagata
    Clinical experience of volumetric modulated arc therapy for malignant pleural mesothelioma after extrapleural pneumonectomy
    Journal of Radiation Research 56, 315–324 (2015). (2015.1.18.)

2014年

- 1. Y Iwai,^† S Ozawa, T Ageishi, R Pellegrini, K Yoda
    Feasibility of single-isocenter, multi-arc non-coplanar volumetric modulated arc therapy for multiple brain tumors using a linear accelerator with a 160-leaf multileaf collimator: a phantom study
    Journal of Radiation Research 55, 1015–1020 (2014). (2014.6.18.)
  2. 河原大輔,^† 小澤修一, 中島健雄, 相田雅道, 河合信太朗, 越智悠介, 奥村拓朗, 増田弘和, 大野吉美, 木村智樹, 永田靖
    肝癌に対する呼吸停止下体幹部定位照射における横隔膜面を基準とした照合法の有用性
    日本放射線技術学会雑誌 70, 51–56 (2014). (2014.1.20.)

2013年

- 1. T Eriguchi, A Takeda, Y Oku, S Ishikura,^† T Kimura, S Ozawa, T Nakashima, Y Matsuo, M Nakamura, Y Matsumoto, S Yamazaki, N Sanuki, Y Ito
    Multi-institutional comparison of treatment planning using stereotactic ablative body radiotherapy for hepatocellular carcinoma – benchmark for a prospective multi-institutional study
    Radiation Oncology 8, 113 (2013). (2013.5.4.)
  2. K Karasawa,^† H Kunogi, T Hirai, H Hoji, H Hirowatari, H Izawa, K Ito, K Sasai, T Furuya, S Ozawa, F Matsumoto, S Ito, S Oba
    Radiotherapy with fraction size of 2.25 Gy in T1-2 laryngeal and hypopharyngeal cancer
    Journal of Radiation Research 54, 684–689 (2013). (2013.1.7.)
  3. M Kawashima,^† S Ozawa, A Haga, A Sakumi, C Kurokawa, S Sugimoto, K Karasawa, K Nakagawa, K Sasai
    Comparison of total MU and segment areas in VMAT and step-and-shoot IMRT plans
    Radiological Physics and Technology 6, 14–20 (2013). (2012.7.1.)

2012年

1. K Karasawa,^† H Kunogi, T Hirai, H Hojo, H Hirowatari, H Izawa, K Ito, K Sasai, M Kawashima, T Furuya, S Sugimoto, C Kurokawa, S Ozawa, M Saito
  Comparison of hypofractionated and conventionally fractionated whole-breast irradiation for early breast cancer patients: a single-institute study of 1,098 patients
  Breast Cancer 21, 402–408 (2012). (2012.9.12.)
2. T Furuya,^† S Sugimoto, C Kurokawa, S Ozawa, K Karasawa, K Sasai
  The dosimetric impact of respiratory breast movement and daily setup error on tangential whole breast irradiation using conventional wedge, field-in-field and irregular surface compensator techniques
  Journal of Radiation Research 54, 157–165 (2012). (2012.8.1.)