Search Results 1-20 of 96

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  • Feed-forward pressure control of balancing cylinder for hybrid electric-pneumatic ultra-precision vertical positioning device  [in Japanese]

    TSUKIYAMA Yoshinobu , KATO Tomonori , NAKAGAKI Shun , XU Youwei

    … In this method, because the weight of the stage is supported by the pneumatic pressure of the balancing cylinder, the linear motor can drive the stage motion without so much affected by the weight of the stage. … But the pressure adjustment takes a bit of time with the conventional method that uses a diaphragm type pressure regulator. …

    TRANSACTIONS OF THE JAPAN FLUID POWER SYSTEM SOCIETY 50(1), 18-24, 2019

    J-STAGE

  • ANALYTICAL MODEL FOR JOINT PANELS WITH SQUARE STEEL TUBES UNDER BI-DIRECTIONAL SHEAR FORCES AND BENDING MOMENTS  [in Japanese]

    CHAN Iathong , KOETAKA Yuji

    … In case of these steel frames, it is very probable that joint panels will yeild earlier than columns or beams under strong ground motion.<br> A lot of numerical studies have been conducted to examine the influence of in-plane elasto-plastic behavior of joint panels on seismic response of plane frames under uni-directional ground motion. …

    Journal of Structural and Construction Engineering (Transactions of AIJ) (745), 503-513, 2018-03

    J-STAGE AIJ

  • Development of robotic gripper using diaphragm mechanism  [in Japanese]

    TENNOMI Masanari , SUZUKI Yosuke , TSUJI Tokuo , WATANABE Tetsuyou

    … <p>This paper proposes the robotic gripper using diaphragm mechanism. … Therefore, if the objects of various shapes can always converge to the same position / posture via a grasping motion, high efficiency of assembly task can be expected. … By using the diaphragm mechanism, it is possible to always open and close the gripping area while maintaining a space of a shape close to a circle. …

    The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2018(0), 2A1-F16, 2018

    J-STAGE

  • Motion Correction for Extracellular Volume Fraction Mapping in Cardiac MRI

    Sato Tetsuo , Kamikawa Satoshi , Nakayama Subaru , Ichinose Nobuyasu , Kuhara Shigehide , Kanaya Shigehiko , Minato Kotaro , Nomura Cesar

    … However, ECV measurement is not accurate when heart motion occurs because of inconsistent and inadequate breath holding during image acquisition. … We present an application of motion-correction algorithm for ECV Maps in cardiac MRI. … The problem with this registration is spatial displacement of the myocardium because of different diaphragm positions. …

    Advanced Biomedical Engineering 7(0), 82-87, 2018

    J-STAGE

  • Estimating Diaphragm Movement from Abdominal Wall Movement Measurements Made by a Simple Device  [in Japanese]

    KANEKO Hideo , IKETAKA Kazunori , URAKAWA Atsuto , NOGUCHI Natsuki

    … [Purpose] This study investigated the validity of estimating the diaphragm movement from abdominal wall movement measurements using a simple breathing movement-measuring device (BMMD). …

    Rigakuryoho Kagaku 32(3), 359-363, 2017

    J-STAGE Ichushi Web

  • Development of a simultaneous measurement method for viscosity and density with an oscillating flow in a micro channel  [in Japanese]

    NAKAYAMA Riho , TANAKA Seiichi , FUJIWARA Seiji

    … A developed viscosity & density meter was consisted of a straight micro channel, a chamber opened to the atmosphere, and a chamber with a diaphragm. … The volumetric vibration of the chamber induced by a diaphragm with a piezoelectric actuator produced an oscillating flow in the channel. …

    The Proceedings of the Symposium on Micro-Nano Science and Technology 2017.8(0), PN-62, 2017

    J-STAGE

  • Cardiac and Respiratory Motion-induced Artifact in Myocardial Perfusion SPECT:4D Digital Anthropomorphic Phantom Study

    Okuda Koichi , Nakajima Kenichi , Kikuchi Akihiro , Onoguchi Masahisa , Hashimoto Mitsumasa

    … The aim of this study was to generate digital phantom models simulated with cardiac and respiratory motions and to evaluate motion-induced artifact using a quantitative software program developed with artificial intelligence (AI) technology in myocardial perfusion single-photon emission computed tomography (SPECT) images.<Br><I>Methods</I>: A digital anthropomorphic torso phantom and Monte Carlo simulation program were used to generate the projection image. …

    Annals of Nuclear Cardiology 3(1), 88-93, 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 phantom was moved from the superior to inferior direction with a 20-mm motion displacement at 3.6 s intervals. …

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

    J-STAGE Ichushi Web

  • Development of Digital Subtraction Angiography Method for Pediatric Cardiac Angiography Using Subtraction Technique with Heart Rate  [in Japanese]

    Niki Ayumi , Honmoto Tsuyoshi , Sanada Shigeru , Hayashi Norio

    … Subtraction techniques were used to eliminate motion artifacts of the heart, thoracic vertebra, ribs, and diaphragm. …

    Japanese Journal of Radiological Technology 72(1), 42-49, 2016

    J-STAGE Ichushi Web

  • Hydrostatic Bearings with Self-Controlled Restrictors Using a Diaphragm:—Numerical Analysis and Experimental Verification as a Guideway—  [in Japanese]

    WAKAZONO Yoshio , YAMATO Hiroki , OHTSUBO Kazuyoshi , ONISHI Kimihiro , NAKAMURA Takashi

    … In our previous work, a numerical analysis based on Reynolds equation, which considers non-linearity of oil flow at restrictor, elastic deformation of plumbing and volumetric strain of air bubble in oil, is proposed for development of a hydrostatic bearing with self-controlled restrictor using a diaphragm. … In this research, a linear motion stage with less bearing pockets than those of conventional guideway is developed by employment of hydrostatic bearing with self-controlled restrictor. …

    Journal of the Japan Society for Precision Engineering 82(1), 93-99, 2016

    J-STAGE

  • Development of micro diaphragm mechanism using surface phenomenon of magnetic fluid  [in Japanese]

    SUDO Seiichi , NAKANISHI Masato , SHINOZAKI Michihiro , NISHIYAMA Hideya

    … Frequency characteristics of micro diaphragm mechanism based on the magnetic fluid-permanent magnet element system were examined experimentally. … It was revealed that the frequency of the liquid surface motion corresponds to the frequency of external alternating magnetic field. … The magnetic field distributions around the element system were also measured, and relations between the magnetic field distribution and magnetic fluid surface motion were discussed. …

    Transactions of the JSME (in Japanese) 81(823), 14-00500-14-00500, 2015

    J-STAGE

  • Four-dimensional Reconstruction of Abdominal MR Images for Target Tracking Based on Respiration-induced Liver Transformation and Deformation for MR-guided Focused Ultrasound Surgery  [in Japanese]

    KUMAMOTO Etsuko , MATSUMOTO Tatsuhiko , HAYASHI Masahiro , KURODA Kagayaki

    … to the focal area is required because the organ moves and deforms with respiratory motion. … This technique, which is based on the relative displacement of the portal vein using sagittal MR images, is effective for translational motion and deformation because blood flow is visualized as high intensity in MR images using TrueFISP. … The images were arranged in breathing phase order based on the motion of the diaphragm. …

    Transactions of Japanese Society for Medical and Biological Engineering 53(3), 168-178, 2015

    J-STAGE

  • The effect of the correlation between the contraction of the pelvic floor muscles and diaphragmatic motion during breathing

    Park Hankyu , Han Dongwook

    … [Purpose] This study was conducted to investigate the effect of the correlation between the pelvic floor muscles (PFM) and diaphragmatic motion during breathing. … [Methods] Radiograph equipment was used to examine diaphragmatic motion with contraction of the PFM during breathing, and a spirometer was used to examine lung vital capacity. …

    Journal of Physical Therapy Science 27(7), 2113-2115, 2015

    J-STAGE Ichushi Web

  • Lung tumor tracking based on thoracic 4D-MR image for radiation therapy  [in Japanese]

    ISA Shuhei , OHNISHI Takashi , MASUDA Yoshitada , HANEISHI Hideaki

    … In radiotherapy in thoracic region, it is critically important to grasp the tumor motion due to respiration in order to avoid unnecessary exposure to healthy organ. … In this scheme, we first model the relationship between the tumor location and feature point location on diaphragm based on thoracic 4D-MRI. … During treatment, tumor location is estimated from the diaphragm in the X-ray fluoroscopy. …

    IEICE technical report. 113(410), 199-204, 2014-01-26

  • Development of low‐cost and low‐dose portable functional X‐ray imaging"Visual stethoscope"  [in Japanese]

    TANAKA Rie , SANADA Shigeru

    … Dynamic chest radiography with computer analysis is expected to be a new type of functional imaging system, which can quantify and visualize cardiopulmonary function on dynamic chest radiographs, such as diaphragm motion, heart wall motion, pulmonary ventilation, and blood circulation. …

    Medical Imaging and Information Sciences 31(2), xiii-xvii, 2014

    IR J-STAGE Ichushi Web

  • Synthetic jet actuator using bubbles produced by electric discharge

    NISHIBE Koichi , FUJIWARA Tamio , OHUE Hiroshi , TAKEZAWA Hideki , SATO Kotaro , YOKOTA Kazuhiko

    … The development of synthetic jet actuators with, for example, a diaphragm, a piston, a piezoelectric element, or a speaker cone instead of mechanical drivers, is required for the downsizing and weight reduction of flow control systems in fluid machines. … Numerical simulations are performed to clarify the fundamental flow behavior of the synthetic jets produced by bubble motion. …

    Journal of Fluid Science and Technology 9(3), JFST0033-JFST0033, 2014

    J-STAGE

  • Reduction of Accompanied Deployment Failure Artifacts Using a Thick Slice Sensitivity Map to Assist with Array Spatial Sensitivity Encoding Technique Imaging  [in Japanese]

    Fujita Takushi , Watanabe Takayuki , Kihara Shou

    … This is because the liver is in contact with the diaphragm, making it susceptible to respiratory motion. …

    Japanese Journal of Radiological Technology 70(8), 793-798, 2014

    J-STAGE Ichushi Web

  • S0220102 Development of durability test apparatus for a pediatric ventricular assist device under pulsatile flow  [in Japanese]

    NISHIDA Masahiro , KOSAKA Ryo , Maruyama Osamu , YAMANE Takashi , SHIRASU Akio , TATSUMI Eisuke , TAENAKA Yoshiyuki

    … To confirm the long-term durability for developing pediatric ventricular assist device (VAD) under pulsatile flow condition, a mock circulation was consisted of a diaphragm pump with a mechanical heart valve, a reservoir, a compliance tank, a resistance and simple-layout flow paths made of polymer or titanium. … The VAD was installed behind the diaphragm pump. …

    The Proceedings of Mechanical Engineering Congress, Japan 2014(0), _S0220102--_S0220102-, 2014

    J-STAGE

  • 4D MRI of Respiratory Organ Motion and Diaphragm Motion Analysis  [in Japanese]

    HANEISHI Hideaki , SWASTIKA Windra , MASUDA Yoshitada

    … Three-dimensional motion picture of thoracoabdominal organ due to respiration offers potential application such as us use in diagnosis of those organs, radiotherapy and/or planning, improvement of PET or SPECT image quality. …

    NIHON GAZO GAKKAISHI (Journal of the Imaging Society of Japan) 52(3), 205-211, 2013

    J-STAGE

  • Diaphragm Respiratory Motion Model with Ribcage Movement  [in Japanese]

    OOKURA Takayuki , ITO Hirotaka , KOSHIZUKA Seiichi , NOMOTO Akihiro , HAGA Akihiro , NAKAGAWA Keiichi

    … The amount of radiation delivered to normal tissues during radiotherapy can be reduced by predicting the respiratory motion of tumor tissues based on physical simulation. … The diaphragm, which lies immediately below the lungs, is one of the main structures involved in respiratory motion and is an important boundary condition for lung deformation. … For these reasons, it is important to estimate the motion of the diaphragm. …

    Medical Imaging Technology 31(3), 189-197, 2013

    J-STAGE

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