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  1. Article

    Open Access

    Impact of metal artifact reduction algorithm on gross tumor volume delineation in tonsillar cancer: reducing the interobserver variation

    Patients with tonsillar cancer (TC) often have dental fillings that can significantly degrade the quality of computed tomography (CT) simulator images due to metal artifacts. We evaluated whether the use of th...

    Yoshiyuki Fukugawa, Ryo Toya, Tomohiko Matsuyama, Takahiro Watakabe in BMC Medical Imaging (2022)

  2. Article

    Open Access

    Impact of four-dimensional cone-beam computed tomography on target localization for gastric mucosa-associated lymphoid tissue lymphoma radiotherapy: reducing planning target volume

    Radiotherapy of gastric mucosa-associated lymphoid tissue (MALT) lymphoma should be delivered to the entire stomach with planning target volume (PTV) that accounts for variations in stomach volume, respiratory...

    Yoshinobu Shimohigashi, Ryo Toya, Tetsuo Saito, Yumiko Kono in Radiation Oncology (2021)

  3. No Access

    Article

    Comparison of rigid and deformable image registration for nasopharyngeal carcinoma radiotherapy planning with diagnostic position PET/CT

    This observer study aimed to compare rigid image registration (RIR) with deformable image registration (DIR) for diagnostic position (DP) positron emission tomography/computed tomography (PET/CT) images in the...

    Yudai Kai, Hidetaka Arimura, Ryo Toya, Tetsuo Saito in Japanese Journal of Radiology (2020)

  4. No Access

    Article

    Commissioning and validation of fluence-based 3D VMAT dose reconstruction system using new transmission detector

    In this study, we evaluated the basic performance of the three-dimensional dose verification system COMPASS (IBA Dosimetry). This system is capable of reconstructing 3D dose distributions on the patient anatom...

    Yuji Nakaguchi, Takeshi Oono, Masato Maruyama in Radiological Physics and Technology (2018)

  5. No Access

    Article

    Four-dimensional cone-beam computed tomography-guided radiotherapy for gastric lymphoma

    We describe a treatment method with four-dimensional cone-beam computed tomography (4D-CBCT)-guided radiotherapy for gastric lymphoma.

    Ryo Toya, Tetsuo Saito, Yoshinobu Shimohigashi in Japanese Journal of Radiology (2018)

  6. Article

    Open Access

    Tumor motion changes in stereotactic body radiotherapy for liver tumors: an evaluation based on four-dimensional cone-beam computed tomography and fiducial markers

    For stereotactic body radiation therapy (SBRT) of liver tumors, tumor motion induced by respiration must be taken into account in planning and treatment. We evaluated whether liver tumor motion at the planning...

    Yoshinobu Shimohigashi, Ryo Toya, Tetsuo Saito, Osamu Ikeda in Radiation Oncology (2017)

  7. No Access

    Article

    Dynamic positioning accuracy of a novel multileaf collimator for volumetric modulated arc therapy

    We investigated the dynamic positioning accuracy of Agility (Elekta) for volumetric modulated arc therapy (VMAT). The accuracy of the multileaf collimator (MLC) leaf position during VMAT was evaluated using th...

    Yuji Nakaguchi, Takeshi Ono, Ryota Onizuka in Radiological Physics and Technology (2016)

  8. No Access

    Article

    Optimization of acquisition parameters and accuracy of target motion trajectory for four-dimensional cone-beam computed tomography with a dynamic thorax phantom

    Our purpose in this study was to evaluate the performance of four-dimensional computed tomography (4D-CBCT) and to optimize the acquisition parameters. We evaluated the relationship between the acquisition par...

    Yoshinobu Shimohigashi, Fujio Araki, Masato Maruyama in Radiological Physics and Technology (2015)

  9. No Access

    Article

    Validation of a quick three-dimensional dose verification system for pre-treatment IMRT QA

    In this study, we evaluated the dosimetric performance of the three-dimensional (3D) dose verification system, COMPASS version 3 (IBA Dosimetry, GmbH, Germany). The COMPASS has the function of a dedicated beam...

    Yuji Nakaguchi, Fujio Araki, Takeshi Ono in Radiological Physics and Technology (2015)