放射線腫瘍科

研究業績

2023年度

• Ikawa T, Kanayama N, Arita H, Ohira S, Takano K, Hirata T, Morimoto M, Teshima T, Konishi K. Linear accelerator-based stereotactic radiotherapy for brain metastases, including multiple and large lesions, carries a low incidence of acute toxicities: a retrospective analysis. Radiat Oncol. 2023 May 10;18(1):80.
• Ohira S, Ikawa T, Kanayama N, Inui S, Ueda Y, Miyazaki M, Nishio T, Koizumi M, Konishi K. Dose reduction of hippocampus using HyperArc planning in postoperative radiotherapy for primary brain tumors. Med Dosim. 2023 Summer;48(2):67-72.
• Inui S, Takahashi Y, Ueda Y, Ohira S, Washio H, Ono S, Miyazaki M, Nishio T, Koizumi M, Konishi K. Dosimetric Comparison of Helical Tomotherapy and HyperArc Treatment Plans for Angiosarcoma of the Scalp. Anticancer Res. 2023 Jul;43(7):3079-3087.
• Ohira S, Ikawa T, Inui S, Kanayama N, Ueda Y, Miyazaki M, Nishio T, Koizumi M, Konishi K. Improvement of target coverage using automated non-coplanar volumetric modulated arc therapy planning in stereotactic radiotherapy for cervical metastatic spinal tumors. Med Dosim. 2023 Autumn;48(3):197-201.
• Ueda H, Ueda Y, Ikawa T, Ohira S, Miyazaki M, Enomoto K, Sakai K, Konishi K. Effect of topical agents on skin surface dose in volumetric modulated arc therapy for head and neck cancer. J Radiat Res. 2023 Jul 18;64(4):644-650.
• Ueda Y, Fukunaga JI, Kamima T, Shimizu Y, Kubo K, Doi H, Monzen H. Standardization of knowledge-based volumetric modulated arc therapy planning with a multi-institution model (broad model) to improve prostate cancer treatment quality. Phys Eng Sci Med. 2023 Sep;46(3):1091-1100.
• Ohira S, Ikawa T, Kanayama N, Minamitani M, Kihara S, Inui S, Ueda Y, Miyazaki M, Yamashita H, Nishio T, Koizumi M, Nakagawa K, Konishi K. Dual-energy computed tomography-based iodine concentration as a predictor of histopathological response to preoperative chemoradiotherapy for pancreatic cancer. J Radiat Res. 2023 Nov 21;64(6):940-947.
• Yamamoto Y, Ohira S, Kanayama N, Inui S, Ueda Y, Koike Y, Miyazaki M, Nishio T, Koizumi M, Konishi K. Comparison of dosimetric parameters and robustness for rotational errors in fractionated stereotactic irradiation using automated noncoplanar volumetric modulated arc therapy for patients with brain metastases: single- versus multi-isocentric technique. Radiol Phys Technol. 2023 Jun;16(2):310-318.
• Ohira S, Suzuki Y, Washio H, Yamamoto Y, Tateishi S, Inui S, Kanayama N, Kawamata M, Miyazaki M, Nishio T, Koizumi M, Nakanishi K, Konishi K. Impact of magnetic resonance imaging-related geometric distortion of dose distribution in fractionated stereotactic radiotherapy in patients with brain metastases. Strahlenther Onkol. 2024 Jan;200(1):39-48.

2022年度

• Kanayama N, Ikawa T, Ohira S, Hirata T, Morimoto M, Ogawa K, Teshima T, Konishi K. Volumetric reduction of brain metastases after stereotactic radiotherapy: Prognostic factors and effect on local control. Cancer Med. 2022 Dec;11(24):4806-4815.
• Sagawa T, Ueda Y, Tsuru H, Kamima T, Ohira S, Tamura M, Miyazaki M, Monzen H, Konishi K. Dosimetric potential of knowledge-based planning model trained with HyperArc plans for brain metastases. J Appl Clin Med Phys. 2023 Feb;24(2):e13836.
• Ohira S, Inui S, Kanayama N, Ueda Y, Miyazaki M, Koizumi M, Konishi K. Automated Non-coplanar Volumetric Modulated Arc Therapy Planning for Maxillary Sinus Carcinoma. In Vivo. 2023 Jan-Feb;37(1):417-423.
• Ohira S, Komiyama R, Kanayama N, Sakai K, Hirata T, Yoshikata K, Ueda Y, Miyazaki M, Nakayama M, Koizumi M, Konishi K. Improvement in bladder volume reproducibility using A-mode portable ultrasound bladder scanner in moderate-hypofractionated volumetric modulated arc therapy for prostate cancer patients. J Appl Clin Med Phys. 2022 Apr;23(4):e13546.
• Ohira S, Komiyama R, Kanayama N, Ueda Y, Inui S, Miyazaki M, Koizumi M, Konishi K. Intra-fractional motion error during HyperArc stereotactic radiosurgery on patients with brain metastases: Comparison of open and full-face clamshell-style immobilization devices. J Appl Clin Med Phys. 2022 Apr;23(4):e13536.

2021年度

• Ikawa T, Tabuchi T, Konishi K, Morimoto M, Hirata T, Kanayama N, Wada K, Toratani M, Okawa S, Ogawa K, Teshima T. Prolonged overall treatment time negatively affects the outcomes of stereotactic body radiotherapy for early-stage non-small-cell lung cancer: A propensity score-weighted, single-center analysis. PLoS One. 2021 Jun 18;16(6):e0253203.
• Ikawa T, Ishihara R, Matsueda K, Konishi K, Yamamoto S, Morimoto M, Kanayama N, Teshima T. Influence of radiation dose and predicted tumor invasion depth on local recurrence after definitive chemoradiotherapy for stage 0-I esophageal squamous cell carcinoma: a propensity score-weighted, retrospective, observational study. BMC Cancer. 2022 Mar 21;22(1):301.
• Inui S, Ueda Y, Ono S, Ohira S, Isono M, Nitta Y, Ueda H, Miyazaki M, Koizumi M, Teshima T. Evaluation of two-dimensional electronic portal imaging device using integrated images during volumetric modulated arc therapy for prostate cancer. Rep Pract Oncol Radiother. 2021 Apr 14;26(2):281-290.
• Ohira S, Koike Y, Akino Y, Kanayama N, Wada K, Ueda Y, Masaoka A, Washio H, Miyazaki M, Koizumi M, Ogawa K, Teshima T. Improvement of image quality for pancreatic cancer using deep learning-generated virtual monochromatic images: Comparison with single-energy computed tomography. Phys Med. 2021 May;85:8-14.
• Washio H, Ohira S, Funama Y, Ueda Y, Isono M, Inui S, Miyazaki M, Teshima T. Accuracy of dose calculation on iterative CBCT for head and neck radiotherapy. Phys Med. 2021 Jun;86:106-112.
• Ohira S, Ueda Y, Kanayama N, Isono M, Inui S, Komiyama R, Washio H, Miyazaki M, Koizumi M, Teshima T, Konishi K. Impact of Multileaf Collimator Width on Dose Distribution in HyperArc Fractionated Stereotactic Irradiation for Multiple (5-10) Brain Metastases. Anticancer Res. 2021 Jun;41(6):3153-3159.
• Nitta Y, Ueda Y, Isono M, Ohira S, Masaoka A, Karino T, Inui S, Miyazaki M, Teshima T. Customization of a Model For Knowledge-Based Planning to Achieve Ideal Dose Distributions in Volume Modulated arc Therapy for Pancreatic Cancers. J Med Phys. 2021 Apr-Jun;46(2):66-72.
• Inui S, Nishio T, Ueda Y, Ohira S, Ueda H, Washio H, Ono S, Miyazaki M, Koizumi M, Konishi K. Machine log file-based dose verification using novel iterative CBCT reconstruction algorithm in commercial software during volumetric modulated arc therapy for prostate cancer patients. Phys Med. 2021 Nov 24;92:24-31.
• Ohira S, Imai Y, Koike Y, Ono S, Ueda Y, Miyazaki M, Koizumi M, Konishi K. Evaluation of Stopping Power Ratio Calculation Using Dual-energy Computed Tomography With Fast Kilovoltage Switching for Treatment Planning of Particle Therapy. In Vivo. 2022 Jan-Feb;36(1):103-110.
• Ohira S, Komiyama R, Koike Y, Washio H, Kanayama N, Inui S, Ueda Y, Miyazaki M, Koizumi M, Teshima T. Dual-energy computed tomography image-based volumetric-modulated arc therapy planning for reducing the effect of contrast-enhanced agent on dose distributions. Med Dosim. 2021 Apr;46(4):328-334.
• Washio H, Ohira S, Funama Y, Ueda Y, Morimoto M, Kanayama N, Isono M, Inui S, Nitta Y, Miyazaki M, Teshima T. Dose Reduction and Low-Contrast Detectability Using Iterative CBCT Reconstruction Algorithm for Radiotherapy. Technol Cancer Res Treat. 2022 Jan-Dec;21:15330338211067312.
• Ueda Y, Tsujii M, Ohira S, Sumida I, Miyazaki M, Teshima T. Residual Set Up Errors of the Surrogate-guided Registration Using Four-dimensional CT Images and Breath Holding Ones in Respiratory Gated Radiotherapy for Liver Cancer. In Vivo. 2021 Jul-Aug;35(4):2089-2098.

2020年度

• Kanayama N, Otozai S, Yoshii T, Toratani M, Ikawa T, Wada K, Hirata T, Morimoto M, Konishi K, Ogawa K, Fujii T, Teshima T. Death unrelated to cancer and death from aspiration pneumonia after definitive radiotherapy for head and neck cancer. Radiother Oncol. 2020 Oct;151:266-272.
• Morimoto M, Nishino K, Wada K, Imamura F, Konishi K, Kuhara H, Tamiya M, Inoue T, Kunimasa K, Kimura M, Hirata T, Kanayama N, Toratani M, Kawachi H, Ohira K, Nakanishi E, Ohira S, Sagawa T, Miyazaki M, Matsunaga T, Kumagai T, Teshima T. Elective Nodal Irradiation for Non-small Cell Lung Cancer Complicated With Chronic Obstructive Pulmonary Disease Affects Immunotherapy Αfter Definitive Chemoradiotherapy. Anticancer Res. 2020 Dec;40(12):6957-6970.
• Ohira S, Kanayama N, Toratani M, Ueda Y, Koike Y, Karino T, Shunsuke O, Miyazaki M, Koizumi M, Teshima T. Stereotactic body radiation therapy planning for liver tumors using functional images from dual-energy computed tomography. Radiother Oncol. 2020 Apr;145:56-62.
• Ueda Y, Suzuki O, Ohira S, Yagi M, Sumida I, Wada K, Inui S, Isono M, Miyazaki M, Ogawa K, Teshima T. The Promising Treatment Schedule of Concurrent Chemoradiotherapy for Stage III Non-small Cell Lung Cancer: Alternative for Conventional Fractionation Using Mathematical Analysis. Anticancer Res. 2020 Jul;40(7):4095-4104.
• Inui S, Ueda Y, Ohira S, Tsuru H, Isono M, Miyazaki M, Koizumi M, Teshima T. Novel strategy with the automatic non-coplanar volumetric-modulated arc therapy for angiosarcoma of the scalp. Radiat Oncol. 2020 Jul 17;15(1):175.
• Ono S, Ueda Y, Inui S, Isono M, Ohira S, Murata S, Miyazaki M, Teshima T. Dosimetric impact of baseline drift in volumetric modulated arc therapy with breath holding. Rep Pract Oncol Radiother. 2020 Sep-Oct;25(5):703-708.
• Ohira S, Takegawa H, Miyazaki M, Koizumi M, Teshima T. Monte Carlo Modeling of the Agility MLC for IMRT and VMAT Calculations. In Vivo. 2020 Sep-Oct;34(5):2371-2380.
• Ono S, Ueda Y, Ohira S, Isono M, Sumida I, Inui S, Morimoto M, Ashida R, Miyazaki M, Ogawa K, Teshima T. Detectability of fiducials’ positions for real-time target tracking system equipping with a standard linac for multiple fiducial markers. J Appl Clin Med Phys. 2020 Nov;21(11):153-162.
• Ueda Y, Monzen H, Fukunaga JI, Ohira S, Tamura M, Suzuki O, Inui S, Isono M, Miyazaki M, Sumida I, Ogawa K, Teshima T. Characterization of knowledge-based volumetric modulated arc therapy plans created by three different institutions’ models for prostate cancer. Rep Pract Oncol Radiother. 2020 Nov-Dec;25(6):1023-1028.
• Washio H, Ohira S, Funama Y, Morimoto M, Wada K, Yagi M, Shimamoto H, Koike Y, Ueda Y, Karino T, Inui S, Nitta Y, Miyazaki M, Teshima T. Metal artifact reduction using iterative CBCT reconstruction algorithm for head and neck radiation therapy: A phantom and clinical study. Eur J Radiol. 2020 Nov;132:109293.
• Komiyama R, Ohira S, Ueda H, Kanayama N, Masaoka A, Isono M, Ueda Y, Miyazaki M, Teshima T. Intra-fractional patient motion when using the Qfix Encompass immobilization system during HyperArc treatment of patients with brain metastases. J Appl Clin Med Phys. 2021 Mar;22(3):254-260.
• Ohira S, Kanayama N, Komiyama R, Ikawa T, Toratani M, Ueda Y, Washio H, Miyazaki M, Koizumi M, Teshima T. Intra-fractional patient setup error during fractionated intracranial stereotactic irradiation treatment of patients wearing medical masks: comparison with and without bite block during COVID-19 pandemic. J Radiat Res. 2021 Jan 1;62(1):163-171.
• Ohira S, Kanayama N, Wada K, Washio H, Karino T, Ueda Y, Inui S, Miyazaki M, Koizumi M, Teshima T. A Third-Generation Adaptive Statistical Iterative Reconstruction for Contrast-Enhanced 4-Dimensional Dual-Energy Computed Tomography for Pancreatic Cancer. J Comput Assist Tomogr. 2021 Jan-Feb 01;45(1):18-23.
• Ueda Y, Miyazaki M, Sumida I, Ohira S, Tamura M, Monzen H, Tsuru H, Inui S, Isono M, Ogawa K, Teshima T. Knowledge-based planning for oesophageal cancers using a model trained with plans from a different treatment planning system. Acta Oncol. 2020 Mar;59(3):274-283.

2019年度

• Ikawa T, Ishihara R, Konishi K, Morimoto M, Hirata T, Kanayama N, Yamamoto S, Matsuura N, Wada K, Hayashi K, Ogawa K, Teshima T. Failure patterns after adjuvant chemoradiotherapy following endoscopic resection for superficial esophageal squamous cell carcinoma. Cancer Med. 2019 Aug;8(10):4547-4554.
• Kishi N, Kanayama N, Hirata T, Ohira S, Wada K, Kawaguchi Y, Konishi K, Nagata S, Nakatsuka SI, Marubashi S, Tomokuni A, Wada H, Kobayashi S, Tomita Y, Teshima T. Preoperative Stereotactic Body Radiotherapy to Portal Vein Tumour Thrombus in Hepatocellular Carcinoma: Clinical and Pathological Analysis. Sci Rep. 2020 Mar 5;10(1):4105.
• Ohira S, Komiyama R, Karino T, Washio H, Ueda Y, Miyazaki M, Koizumi M, Teshima T. Volumetric modulated arc therapy planning based on virtual monochromatic images: Effect of inaccurate CT numbers on dose distributions. Phys Med. 2019 Apr;60:83-90.
• Ueda Y, Ohira S, Yamazaki H, Mabuchi N, Higashinaka N, Miyazaki M, Teshima T. Dosimetric performance of two linear accelerator-based radiosurgery systems to treat single and multiplebrain metastases. Br J Radiol. 2019 Aug;92(1100):20190004.
• Sagawa T, Ohira S, Ueda Y, Akino Y, Mizuno H, Matsumoto M, Miyazaki M, Koizumi M, Teshima T. Dosimetric effect of rotational setup errors in stereotactic radiosurgery with HyperArc for single and multiple brain metastases. J Appl Clin Med Phys. 2019 Oct;20(10):84-91.
• Washio H, Ohira S, Kanayama N, Wada K, Karino T, Komiyama R, Miyazaki M, Teshima T. Effect of a saline flush technique for head and neck imaging in dual-energy CT: improvement of image quality and perivenous artefact reduction using virtual monochromatic imaging. Clin Radiol. 2019 Oct;74(10):805-812.
• Komiyama R, Ohira S, Kanayama N, Karino T, Washio H, Ueda Y, Miyazaki M, Teshima T. Volumetric modulated arc therapy treatment planning based on virtual monochromatic images for head and neck cancer: effect of the contrast-enhanced agent on dose distribution. J Appl Clin Med Phys. 2019 Nov;20(11):144-152.
• Ueda Y, Takakura T, Ota S, Kito S, Sasaki K, Shimizu H, Tatsumi D, Yano S, Nakamura M. Questionnaire survey on treatment planning techniques for lung stereotactic body radiotherapy in Japan. J Radiat Res. 2020 Jan 23;61(1):104-116.
• Miyazaki M, Ohira S, Ueda Y, Isono M, Fujiwara M, Tanooka M, Okada W, Nakahara R, Sueoka M, Suzuki H, Teshima T, Yamakado K. Oesophageal Cancer: Conformal Radiotherapy vs. Hybrid-VMAT Technique With Two Different Treatment Planning Systems. In Vivo. 2020 Jan-Feb;34(1):331-337.
• Isono M, Akino Y, Mizuno H, Tanaka Y, Masai N, Yamamoto T. Inter-unit variability of multi-leaf collimator parameters for IMRT and VMAT treatment planning: a multi-institutional survey. J Radiat Res. 2020 Mar 23;61(2):307-313.
• • Ohira S, Sagawa T, Ueda Y, Inui S, Masaoka A, Akino Y, Mizuno H, Miyazaki M, Koizumi M, Teshima T. Effect of collimator angle on HyperArc stereotactic radiosurgery planning for single and multiple brain metastases. Med Dosim. 2020 Spring;45(1):85-91.