Search Results 1-20 of 483

  • 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. … The median 3D tumor motion was 17.9 mm (range: 8.2–27.2 mm). … Ten phase-specific subplans were generated by calculating the dose on each respiratory phase computed tomography (CT) scan using temporally assigned VMAT arcs. …

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


  • Variation in target volume and centroid position due to breath holding during four-dimensional computed tomography scanning: A phantom study

    Miyamae Yuta , Akimoto Mami , Sasaki Makoto , Fujimoto Takahiro , Yano Shinsuke , Nakamura Mitsuhiro

    … This study investigated the effects of respiratory motion, including unwanted breath holding, on the target volume and centroid position on four‐dimensional computed tomography (4DCT) imaging. … A spherical object 20 mm in diameter was moved according to several simulated respiratory motions, with a motion period of 4.0 s and maximum amplitude of 5 mm. …

    Journal of Applied Clinical Medical Physics 21(1), 11-17, 2020-01


  • Type II Respiratory Failure with Systemic Sclerosis/Polymyositis Overlap Syndrome:A Case Report of Successful Respiratory Rehabilitation Therapy  [in Japanese]

    Okada Takashi , Kadono Izumi , Konno Suzuna , Sugiyama Junya , Hishida Aika , Nishida Yoshihiro , Sugiura Hideshi

    … <p>Introduction:Respiratory failures are categorized into types I and II. … To our knowledge, we report the first case of pulmonary rehabilitation in a patient with systemic sclerosis/polymyositis overlap syndrome who developed type II respiratory failure.</p><p>Methods:The patient was a 77-year-old woman who had received treatment for systemic sclerosis and polymyositis at another hospital. …

    The Japanese Journal of Rehabilitation Medicine 57(5), 468-473, 2020


  • Safety and Efficacy of Human Muse Cell-Based Product for Acute Myocardial Infarction in a First-in-Human Trial

    Noda Toshiyuki , Nishigaki Kazuhiko , Minatoguchi Shinya

    … The safety and efficacy on LVEF and wall motion score index (WMSI) were evaluated for 12 weeks. …

    Circulation Journal, 2020


  • Comparison of Silent Navigator Waveform Generation Methods

    Iwadate Yuji , Nozaki Atsushi , Nunokawa Yoshinobu , Okuda Shigeo , Kabasawa Hiroyuki , Jinzaki Masahiro

    … <p>The silent navigator technique utilizes a non-selective excitation and an appropriate respiratory waveform generation method is necessary for an accurate motion detection. …

    Magnetic Resonance in Medical Sciences 19(2), 154-158, 2020


  • Utility of Stack-of-stars Acquisition for Hepatobiliary Phase Imaging without Breath-holding

    Ichikawa Shintaro , Motosugi Utaroh , Kromrey Marie-Luise , Tamada Daiki , Wakayama Tetsuya , Wang Kang , Cashen Ty A , Ersoz Ali , Onishi Hiroshi

    … Two independent radiologists qualitatively analyzed (overall image quality, liver edge sharpness, hepatic vein clarity, streak artifacts, and respiratory motion/pulsation artifacts) HBP images taken by the three sequences using a five-point scale. … images showed stronger respiratory motion/pulsation artifacts than the others (<i>P</i> …

    Magnetic Resonance in Medical Sciences 19(2), 99-107, 2020


  • Estimation of Office Worker's Emotions Using Wearable Biometric Sensor

    HAYANO Junichiro , TANABIKI Tetsuya , IWATA Shinichiro , ABE Katsumi , YUDA Emi

    … In 11 healthy office workers, pulse rate, pulse rate variability (PRV), skin temperature, body motion, and conversation time were continuously monitored between 08:30 and 21:30 on every workday using a bracelet-shape wearable sensor. …

    International Symposium on Affective Science and Engineering ISASE2020(0), 1-3, 2020


  • Usefulness of Respiratory Suppression for Abdominal Using EPI Sequences  [in Japanese]

    Yoshimura Yuuki , Suzuki Daisuke , Miyahara Kanae

    … <p>The upper abdomen was imaged with diffusion weighted images for free breathing and respiratory suppression using single shot-echo planar imaging (SS-EPI) and readout segmented-EPI (RS-EPI). … We examined the usefulness of respiratory suppression imaging for the subject of healthy volunteers. … Motion artifacts, apparent diffusion coefficient (ADC) values, and organs movement distances were evaluated. …

    Japanese Journal of Radiological Technology 76(4), 385-393, 2020


  • Clinical Application of Compressed Sensing MRI  [in Japanese]

    YAMAMOTO Akira

    <p>圧縮センシング法を含めたスパースモデリング技術による間引き収集データからのMRI画像再構成研究を科研費新学術領域の枠組みで遂行した.圧縮センシング法は,従来の高速撮像技術であるパラレルイメージング法と異なるアルゴリズムにより,MRI高速撮像を可能にする技術である.頭部血管MRA,腹部肝臓MRCP,乳腺ダイナミック造影MRIなどへの圧縮センシング臨床MRI応用を検討した.圧縮センシ …

    Medical Imaging Technology 38(2), 57-66, 2020


  • Motion Artifact Reduction Using a Convolutional Neural Network for Dynamic Contrast Enhanced MR Imaging of the Liver

    Tamada Daiki , Kromrey Marie-Luise , Ichikawa Shintaro , Onishi Hiroshi , Motosugi Utaroh

    … <p>Purpose: To improve the quality of images obtained via dynamic contrast enhanced MRI (DCE-MRI), which contain motion artifacts and blurring using a deep learning approach.</p><p>Materials and Methods: A multi-channel convolutional neural network-based method is proposed for reducing the motion artifacts and blurring caused by respiratory motion in images obtained via DCE-MRI of the liver. …

    Magnetic Resonance in Medical Sciences 19(1), 64-76, 2020


  • Pharyngeal contraction secondary to its collapse in dogs with brachycephalic airway syndrome

    HARA Yohei , TESHIMA Kenji , SEKI Mamiko , ASANO Kazushi , YAMAYA Yoshiki

    … Pharyngeal collapse is also commonly observed, but it is unclear if laryngopharynx motions are merely sequelae or actually contribute to BAS respiratory symptoms. … Laryngopharynx motion was imaged using dynamic four-dimensional computed tomography (4D-CT) during spontaneous respiration in four dogs with different BAS types. … Dynamic 4D-CT showed laryngopharynx motion in the following order during inspiration: pharyngeal collapse, contraction, and laryngospasm. …

    Journal of Veterinary Medical Science 82(1), 64-67, 2020


  • Simple Identification of Cerebrospinal Fluid Turbulent Motion Using a Dynamic Improved Motion-sensitized Driven-equilibrium Steady-state Free Precession Method Applied to Various Types of Cerebrospinal Fluid Motion Disturbance

    ATSUMI Hideki , HORIE Tomohiko , KAJIHARA Nao , SUNAGA Azusa , SAKAKIBARA Yumetaro , MATSUMAE Mitsunori

    … <p>The motion of cerebrospinal fluid (CSF) within the subarachnoid space and ventricles is greatly modulated when propagating synchronously with the cardiac pulse and respiratory cycle and path through the nerves, blood vessels, and arachnoid trabeculae. …

    Neurologia medico-chirurgica 60(1), 30-36, 2020


  • 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. … Therefore, the proposed method has potential for contributing to effectively observe internal organ motion.</p> …

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


  • Development of Radiation Therapy for Hepatobiliary and Pancreatic Cancers  [in Japanese]

    澁谷 景子

    放射線療法は, ほぼすべての臓器がんに対し対応可能な低侵襲性治療である. 特に, この30年間は放射線照射技術の進歩が目覚ましく, 腫瘍と正常臓器との位置関係を3次元的に把握し線量分布を評価することのできる3次元治療が主流となった. さらに, 腫瘍への選択性を高める技術として, 定位放射線照射(定位放射線治療, 定位手術的照射)や強度変調放射線治療, 画像誘導放射線治療といった高精度放射線治療が日 …

    大阪市医学会雑誌 (68), 1-8, 2019-12-25


  • Perioperative rehabilitation for living-donor liver transplant recipients  [in Japanese]

    YAHATA Tetsutaro

    … In the period of postoperative intensive care, immobilization is directed for a certain number of days, because undesirable deviation of the graft liver is averted while the graft is not fixed, and possible risk of bleeding causedby any motion is an anxious matter after beginning postoperative anticoagulant therapy. … In the same period, both respiratory rehabilitation and early ambulation have to be poorly performed, and therefore, another intervention should be flexibly considered. …

    Japanese Journal of Transplantation 54(6), 273-278, 2019


  • 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. … This study proposes an FIR type repetitive lung-tumor position predictor which is designed to be robust to the changes of tumor motion period of a patient. …

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


  • Self-propelled catheter aiming at reaching the periphery of the lung  [in Japanese]

    IMAI Yuki , TSUKAGOSHI Hideyuki , MIYOSHI Shion , TAKAI Yujiro

    … <p>In respiratory diseases typified by lung cancer, biopsy in the lung using an endoscope is considered as effective for diagnosis. … The proposed device consists of a flexible tube with an outer diameter of 2.6 mm, and both of the propulsion motion and steering motion are generated by the pneumatics. …

    The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2019(0), 1A1-B12, 2019


  • Extraction of Respiratory Motion Features from Sleeping Body Pressure Distribution Time Series by Generalized Morphological Component Analysis  [in Japanese]

    Takahashi Hiroto , Horiguchi Yukio , Murase Toru , Nakanishi Hiroaki , Sawaragi Tetsuo , Chiba Shintaro , Nishino Seiji

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    Proceedings of the Fuzzy System Symposium 35(0), 529-534, 2019


  • Influence and Countermeasure of Respiratory Motion on Matchline Profile of Field Matching Technique in Passive Scattering Proton Therapy for Esophageal Cancer  [in Japanese]

    Kato Masato , Wada Hitoshi , Murakami Masao , Takeda Ken , Dobashi Suguru , Kato Takahiro , Kato Ryohei , Masaki Keita , Arai Kazuhiro , Komori Shinya , Oyama Sho , Endo Hiromitsu

    … <p>This study aimed to evaluate the influence of change in respiratory motion on matchline (ML) and reduction of the effect by increasing ML levels of field matching technique in passive scattering proton therapy for esophageal cancer. … To evaluate the influence of respiratory motion in terms of stability, we measured relative dose around ML using a respiratory motion phantom. …

    Japanese Journal of Radiological Technology 75(12), 1383-1393, 2019

    J-STAGE  Ichushi Web 

  • Influence of Respiratory Phase during Image Acquisition on Prescribed Dose in Image Guided Radiation Therapy Using Implant Marker for Prostate Cancer  [in Japanese]

    Matsubayashi Fumiyasu , Takahashi Ryo , Kamima Tatsuya , Sato Yosuke , Sato Tomoharu

    … <p>In image guided radiation therapy (IGRT) using implanted fiducial marker by two-dimensional radiography for prostate cancer, temporal positional relationship during treatment between the isocenter and the prostate is changed by respiratory phase at the time of image acquisition. … We examined influence of the respiratory phase in the IGRT on dose variation by interplay effect. …

    Japanese Journal of Radiological Technology 75(12), 1394-1402, 2019

    J-STAGE  Ichushi Web 

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