Search Results 1-20 of 53

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  • Investigation of 4D dose in volumetric modulated arc therapy-based stereotactic body radiation therapy: does fractional dose or number of arcs matter?

    Shintani Takashi , Nakamura Mitsuhiro , Matsuo Yukinori , Miyabe Yuki , Mukumoto Nobutaka , Mitsuyoshi Takamasa , Iizuka Yusuke , Mizowaki Takashi

    … The aim of this study was to assess the impact of fractional dose and the number of arcs on interplay effects when volumetric modulated arc therapy (VMAT) is used to treat lung tumors with large respiratory motions. … A three (fractional dose of 4, 7.5 or 12.5 Gy) by two (number of arcs, one or two) VMAT plan was created for 10 lung cancer cases. … The median 3D tumor motion was 17.9 mm (range: 8.2–27.2 mm). …

    Journal of Radiation Research 61(2), 325-334, 2020-03


  • Hidden Markov Model-based Extraction of Target Objects in X-ray Image Sequence for Lung Radiation Therapy  [in Japanese]

    Shindo Masahiro , Ichiji Kei , Homma Noriyasu , Zhang Xiaoyong , Okuda Shungo , Sugita Norihiro , Yamaki Shunsuke , Takai Yoshihiro , Yoshizawa Makoto

    … <p>It is an important task to accurately track the target tumor with respiratory movement during radiation therapy. … X-ray imaging technique is capable of observing the internal organ motion. … However, superimposed tissues and structures in X-ray images decrease tumor localization accuracy. …

    IEEJ Transactions on Electronics, Information and Systems 140(1), 49-60, 2020


  • Prediction of respiratory tumor motion based on FIR repetitive control  [in Japanese]

    OKUSAKO Shouta , FUJII Fumitake , SHIINOKI Takehiro

    … <p>It is known that position of lung tumor motion changes because of the respiration and the heartbeat of a patient being treated. … Treatment accuracy will be severely deteriorated unless negative influences caused by the positional variation of the tumor are not properly compensated. …

    The Proceedings of Mechanical Engineering Congress, Japan 2019(0), J24110P, 2019


  • Angiosarcoma Identified by Diffuse Alveolar Hemorrhaging Associated with Disseminated Intravascular Coagulation

    Tanigawa Tomohiko , Koh Hidefumi , Tani Tetsuo , Takehara Tomohiro , Suzuki Yoshihisa

    … Primary angiosarcoma of the bone is an extremely rare form of vascular bone tumor, accounting for <1% of primary malignant bone tumors. … It tends to involve the long, tubular bones of the extremities, and more than half of cases are found with metastasis, especially to the lung. … Once metastasis to the lung has occurred, patients usually present with symptoms such as dyspnea, chest pain, and hemoptysis. …

    The Journal of the Japan Society for Respiratory Endoscopy 41(6), 640-645, 2019


  • Management of Respiratory Motion in External Radiation Therapy in the Deaf-Mute by Visual Instruction  [in Japanese]

    山本 安澄 , 福本 賢大 , 田中 和徳 , 小菅 友裕 , 宮井 明 , 花井 悠起 , 津川 和夫

    … we perform external radiotherapy in our hospital,we use respiration-gated radiotherapy to treat tumor sites affected by respiratory motion such as lung and liver tumors.In respiration-gated radiotherapy,the patient is instructed to hold his/her breath in the irradiation room by a voice coming from a microphone in the operator's room.However, the deaf-mute patient cannot hear the instructions,so we improved the visual instruction method which projects a slide on a screen for the patient …

    京都市立病院紀要 38(1), 26-28, 2018-09-15

    IR  Ichushi Web 

  • Modeling Respiratory Induced Lung Tumor Motion for Highly Efficient Radiotherapy  [in Japanese]

    FUJII Fumitake , KASHIBE Naoto , SHIINOKI Takehiro

    … <p>It is known that some tumors exhibit respiratory induced motion inside the body of a patient. … Although present radiotherapy technology called gating window method can track the motion of the tumor and irradiate it when it is close to the pre-planned position, it takes a long time to irradiate the prescribed dose to the tumor. …

    The Proceedings of Mechanical Engineering Congress, Japan 2018(0), J2410102, 2018


  • A reference trajectory correction algorithm to improve the tracking accuracy of the robotic phantom system used in the quality assurance of the radiation therapy  [in Japanese]

    FUJII Fumitake , SHIINOKI Takehiro , SHIBUYA Keiko , KASHIBE Naoto , MARUYAMA Akira

    … Quality assuarance is the important clinical part of the radiation therapy which ensures the delivery of the prescribed dose to the tumor of the patient. … High precision quality assurance can be a difficult task if the tumor exhibits respiratory induced motion inside the body of the patient, as the motion fluctuates along with time and it suffers large inter-patient difference. …

    Transactions of the JSME (in Japanese) 84(861), 17-00495-17-00495, 2018


  • Dynamic tumor tracking radiotherapy  [in Japanese]

    松尾 幸憲

    日本臨床 = Japanese journal of clinical medicine 75(8), 1172-1176, 2017-08

    Ichushi Web 

  • Retrospective Study of Real-time Tumor-tracking Radiotherapy and Gold Marker Placement  [in Japanese]

    Miwa Maki , Yomota Makiko , Nagamata Makoto , Watanabe Kageaki , Zenke Yoshitaka , Okuma Yusuke , Hosomi Yukio , Okamura Tatsuru

    … The use of stereotactic body radiotherapy (SBRT) is useful in the treatment of stage I non-small cell lung cancer, metastatic lung tumors, and patients in whom surgery or chemotherapy is not recommended due to complications or advanced age. … SBRT precisely targets and delivers radiation to the tumor despite the movement of the tumor during respiration using methods that track respiratory tumor motion; …

    The Journal of the Japan Society for Respiratory Endoscopy 39(6), 486-489, 2017

    J-STAGE  Ichushi Web 

  • Calculation Accuracy of Gross Tumor Volume at the Diaphragm Boundary Evaluated Using Respiratory-gated PET/CT  [in Japanese]

    Nakazawa Shuto , Usui Keisuke , Sasai Keisuke , Umeda Takuro , Miyaji Noriaki , Miwa Kenta , Wagatsuma Kei , Motegi Kazuki , Takiguchi Tomohiro , Terauchi Takashi , Koizumi Mitsuru

    … <p><i>Objective</i>: The present study aimed to clarify gross tumor volume (GTV) contouring accuracy at the diaphragm boundary using respiratory-gated PET/CT. … <i>Methods</i>: The lung/diaphragm boundary was simulated using a phantom containing <sup>18</sup>F solution (10.6 kBq/mL). … The tumor background ratios (TBR) were 2, 4, and 8. …

    Japanese Journal of Radiological Technology 73(8), 617-625, 2017

    J-STAGE  Ichushi Web 

  • A dosimetric comparison of real-time adaptive and non-adaptive radiotherapy: A multi-institutional study encompassing robotic, gimbaled, multileaf collimator and couch tracking

    Colvill Emma , Booth Jeremy , Nill Simeon , Fast Martin , Bedford James , Oelfke Uwe , Nakamura Mitsuhiro , Poulsen Per , Worm Esben , Hansen Rune , Ravkilde Thomas , Scherman Rydhög Jonas , Pommer Tobias , Munck af Rosenschold Per , Lang Stephanie , Guckenberger Matthias , Groh Christian , Herrmann Christian , Verellen Dirk , Poels Kenneth , Wang Lei , Hadsell Michael , Sothmann Thilo , Blanck Oliver , Keall Paul

    … Purpose: A study of real-time adaptive radiotherapy systems was performed to test the hypothesis that, across delivery systems and institutions, the dosimetric accuracy is improved with adaptive treatments over non-adaptive radiotherapy in the presence of patient-measured tumor motion. …

    Radiotherapy and Oncology 119(1), 159-165, 2016-04-01


  • Evaluation of the motion of lung tumors during stereotactic body radiation therapy (SBRT) with four-dimensional computed tomography (4DCT) using real-time tumor-tracking radiotherapy system (RTRT)

    Harada Keiichi , Katoh Norio , Suzuki Ryusuke , Ito Yoichi M. , Shimizu Shinichi , Onimaru Rikiya , Inoue Tetsuya , Miyamoto Naoki , Shirato Hiroki

    Physica medica : European journal of medical physics 32(2), 305-311, 2016-02


  • Construction of a model for the prediction of lung tumor motion for radiotherapy  [in Japanese]

    KASHIBE Naoto , FUJII Fumitake , SHIBUYA Keiko , SHIINOKI Takehiro , KAWAMURA Shinji , TANABE Yoshinori

    … <p>This paper discloses the development of a recursive mathematical model for radiotherapy which predicts future position of the lung tumor based on the current and past tumor position measurements. … Numerical evaluation has been performed for 9 different lung tumor trajectories and the models are successfully trained to achieve the required precision for all dataset. …

    The Proceedings of the Dynamics & Design Conference 2016(0), 713, 2016


  • Development of Lung Tumor Motion Prediction Method Using the SSA and MSSA Method for the Real Time Tumor Tracking Radiotherapy (RTRT) System

    DEMACHI Kazuyuki , KAWAI Masaki , KIUCHI Takashi , SUGAHARA Kohichiroh

    … A simulation method was developed to predict the location of the human lung tumors during breathing. …

    Journal of the Japan Society of Applied Electromagnetics and Mechanics 24(1), 28-35, 2016


  • Target Extraction from X-ray Image Sequence by using Gaussian Mixture Model for Lung Tumor Tracking  [in Japanese]

    SHIBUSAWA Naoki , ICHIJI Kei , YOSHIDA Yusuke , ZHANG Xiaoyang , HOMMA Noriyasu , TAKAI Yoshihiro , YOSHIZAWA Makoto

    … During treatment fraction, accurate tracking of moving tumor by using X-ray imaging is important for radiation therapy. … However, superimposition of tumor and other structure in X-ray image can reduce tracking accuracy. …

    IEICE technical report. 114(482), 277-282, 2015-03-02

  • Generating 4D-CT image using motion information obtained from 4D-MR image  [in Japanese]

    ISA Shuhei , OHNISHI Takashi , MASUDA Yoshitada , MOTOORI Ken , UNO Takashi , HANEISHI Hideaki

    … In the highly accurate radiation therapies of thoracic region, the tumor and organ motion greatly impacts on the result because they deliver localized irradiation and high dose. … Thus, it is important to evaluate the tumor and organ motion due to respiration on treatment planning. … The objective of this study is to generate 4D-CT image from 3D-CT image using motion information obtained from 4D-MR image. …

    IEICE technical report. 114(482), 173-176, 2015-03-02

  • Optimal Parameter Decision Method in VMAT for Lung Tumors with Respiratory Motions  [in Japanese]

    Matsubayashi Fumiyasu , Sato Tomoharu , Kozuka Takuyo , Oguchi Masahiko , Hashimoto Masatoshi , Uehara Ryuzo , Takahashi Ryo , Ito Yasushi , Saotome Satoko , Sekiya Yuko , Nakajima Masaru , Kitamura Nozomi

    … When performing lung cancer treatments using volumetric modulated arc therapy (VMAT) technique, dose error related to respiratory motion of tumors and multi leaf collimator (MLC) movement may occur. … The purpose of this study is to verify the influence of the respiratory motion and the MLC movement on the daily dose variation, and to confirm the feasibility of deciding robust planning parameter against the dose variation. …

    Japanese Journal of Radiological Technology 71(4), 301-307, 2015

    J-STAGE  Ichushi Web 

  • Baseline correction of a correlation model for improving the prediction accuracy of infrared marker-based dynamic tumor tracking

    Akimoto Mami , Nakamura Mitsuhiro , Mukumoto Nobutaka , Yamada Masahiro , Tanabe Hiroaki , Ueki Nami , Kaneko Shuji , Matsuo Yukinori , Mizowaki Takashi , Kokubo Masaki , Hiraoka Masahiro

    … We previously found that the baseline drift of external and internal respiratory motion reduced the prediction accuracy of infrared (IR) marker-based dynamic tumor tracking irradiation (IR Tracking) using the Vero4DRT system. … We retrospectively applied this function to 53 paired log files of the 4D model for 12 lung cancer patients who underwent IR Tracking. …

    Journal of Applied Clinical Medical Physics 16(2), 14-22, 2015


  • Influence of respiration on dose calculation in stereotactic body radiotherapy of the lung

    Yamazaki Rie , Onimaru Rikiya , Katoh Norio , Inoue Tetsuya , Nishioka Tetsuya , Shirato Hiroki , Date Hiroyuki

    Radiological physics and technology 7(2), 284-289, 2014-07

    IR  Ichushi Web 

  • Lung tumor motion tracking using sequential inter-phase deformable registration for radiation treatment planning (Medical Imaging)

    JUNG Julip , JO Hyun Hee , HONG Helen , KANG Young-Nam , LEE Soo-Yeol

    … To predict varying tumor location during free-breathing in 4D radiotherapy planning, we propose an automatic lung tumor motion tracking method using sequential inter-phase deformable registration for all respiratory phase images in 4D CT. … First, global lung transformations of all phases are estimated along respiratory rate following the affine registration between end-inspiration (EI) and end-expiration (EE) phases. …

    IEICE technical report. 114(103), 53-58, 2014-06-24

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