Ryuta Nakahara

Ensuring bladder volume reproducibility and reducing cone-beam computed tomography-related radiation exposure in prostate hypofractionated radiotherapy by a Certified Nurse in Radiation Oncology nursing

Chiaki Shimada, Kentaro Ishii, Yoji Koorita, Ryuta Nakahara et autres

The role of the Certified Nurse in Radiation Oncology nursing (CN-RO) has expanded to include support for ensuring treatment reproducibility and minimizing medical radiation exposure through radiation protection measures. In hypofractionated radiotherapy for prostate cancer, in which consistent pretreatment bladder volume is …

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A multi-institutional survey on technical variations in total body irradiation in Japan

Masayasu Kitagawa, Ryoichi Notake, Ryuta Nakahara, Shogo Hatanaka et autres

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Validating knowledge-based volumetric modulated arc therapy plans with a multi-institution model (broad model) using a complete open-loop dataset for prostate cancer

Takaaki Ito, Kazuki Kubo, Ryuta Nakahara, Jun-ichi Fukunaga et autres

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Error Detectability of Isodose Volumes as ROIs in Prostate Intensity-modulated RT QA

Ryuta Nakahara, Masayuki Fujiwara, HARUYUKI TAKAKI, Masao TANOOKA et autres

BACKGROUND/AIM: To evaluate the quality of error detectability with a three-dimensional verification system using isodose volumes as regions of interest (ROIs) in quality assurance (QA) of intensity-modulated radiation therapy. PATIENTS AND METHODS: Treatment plans with four types of intentional errors were created …

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Oesophageal Cancer: Conformal Radiotherapy vs. Hybrid-VMAT Technique With Two Different Treatment Planning Systems

Masayoshi Miyazaki, Shingo Ohira, Yoshihiro Ueda, Masaru Isono et autres

BACKGROUND/AIM: Traditionally, the radiotherapy of oesophageal cancer has been conformal radiotherapy (CRT). We sought to compare dosimetric parameters of conformal radiotherapy (CRT) with those of two treatment planning systems for hybrid-volumetric modulated arc therapy (h-VMAT) for the treatment of oesophageal cancer. PATIENTS …

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Oesophageal Cancer: Conformal Radiotherapy vs. Hybrid-VMAT Technique With Two Different Treatment Planning Systems

Masayoshi Miyazaki, Shingo Ohira, Yoshihiro Ueda, Masaru Isono et autres

Background/Aim: Traditionally, the radiotherapy of oesophageal cancer has been conformal radiotherapy (CRT). We sought to compare dosimetric parameters of conformal radiotherapy (CRT) with those of two treatment planning systems for hybrid-volumetric modulated arc therapy (h-VMAT) for the treatment of oesophageal cancer. Patients …

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Inter-planner variation in treatment-plan quality of plans created with a knowledge-based treatment planning system

Kazuki Kubo, Hajime Monzen, Kentaro Ishii, Mikoto Tamura et autres

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Couch modeling optimization for tomotherapy planning and delivery

Wataru Okada, Masao TANOOKA, Keisuke Sano, Mayuri Shibata et autres

Abstract We sought to validate new couch modeling optimization for tomotherapy planning and delivery. We constructed simplified virtual structures just above a default setting couch through a planning support system (MIM Maestro, version 8.2, MIM Software Inc, Cleveland, OH, USA). Based on …

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EP-1841 Couch modeling optimization for TomoTherapy planning and delivery

Masao TANOOKA, W. Okada, K. Sano, S. Mayuri et autres

Minimizing dose variation from the interplay effect in stereotactic radiation therapy using volumetric modulated arc therapy for lung cancer

Kazuki Kubo, Hajime Monzen, Mikoto Tamura, Makoto Hirata et autres

Abstract It is important to improve the magnitude of dose variation that is caused by the interplay effect. The aim of this study was to investigate the impact of the number of breaths (NBs) to the dose variation for VMAT‐SBRT to lung …

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Dosimetric Comparison between Bone and Target Matching Considering Interfractional Prostate Motion in Volumetric Modulated Arc Therapy

Ryuta Nakahara, Kentaro Ishii, Nobuhide Wakai, Ryu Kawamorita et autres

Adequate matching methods are critical for accurate volumetric-modulated arc therapy (VMAT). We investigated the dosimetric differences in the target and organs at risk (OARs) between bone matching and target matching in patients with prostate cancer treated with VMAT. The relationship between the …

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Bowel and urinary quality of life after whole-pelvic versus prostate-only volumetric-modulated arc therapy for localized prostate cancer

Kentaro Ishii, Toshiko Yamanaga, Ryo Ogino, Yukinari Hosokawa et autres

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