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83 results on '"Yunokuchi, Kazutomo"'

1. Optimization of Eddy Current Distribution Using Magnetic Substance in TMS

Author

Odagaki, Masato, Taura, Toshiyuki, Kikuchi, Yutaka, Yunokuchi, Kazutomo, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Goebel, Randy, editor, Siekmann, Jörg, editor, Wahlster, Wolfgang, editor, Imamura, Kazayuki, editor, Usui, Shiro, editor, Shirao, Tomoaki, editor, Kasamatsu, Takuji, editor, Schwabe, Lars, editor, and Zhong, Ning, editor

Published
2013
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9. Study of open‐type magnetically shielded room for MRI.

Author

Kamata, Kiyotaka, Tamari, Yozo, Temma, Satoru, Goto, Koshi, and Yunokuchi, Kazutomo

Subjects
MAGNETIC resonance imaging centers, MAGNETIC resonance imaging, MAGNETIC fields, HOSPITAL buildings, RESONANCE, THREE-dimensional imaging
Abstract

The magnetic resonance imaging (MRI) is usually installed in a magnetically shielded room (MSR), in order to reduce the leakage flux density to less than 0.5 mT outside the room. The small space enclosed by the wall causes patients a great deal of stress and discomfort because they are isolated from the operators and from the scenery outside. In order to improve amenity for patients in hospitals, open type of MSRs for MRI, which use canceling coils, combined with square cylinders made by magnetic and conductive material, and magnetic material plates instead of magnetic walls. The magnetic shielding effects of open type of MSR combined with square cylinders model made by magnetic, conductive material, magnetic material plates model, and lattice shape model made of magnetic material for MRI are estimated by 3D magnetic field analysis. In this report, we clarify simple lattice of magnetic plate with gap to improve shielding performance using 3D magnetic field analysis. [ABSTRACT FROM AUTHOR]

Published
2019
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10. The Development of a Measuring System for the Electromagnetic Phenomena Caused by Volcanic Activity of Mount Sakurajima

Author

Kamata, Kiyotaka, Yunokuchi, Kazutomo, Yoshino, Takashi, Yamazaki, Keita, Kato, Kazuo, and Nagao, Toshiyasu

Subjects
Magnetometer -- Usage, Volcanoes -- Analysis, Electromagnetism -- Measurement, Business, Electronics, Electronics and electrical industries
Abstract

In order to examine the relationship between volcanic explosions and electromagnetic phenomena, we constructed the continuous extremely low frequency (ELF) band measuring system, which is composed of geoelectric potential differences (GPD's) and geomagnetic fields (GF's) at the foot of Mt. Sakurajima, Kyushu Island, Japan. The results of the measurements show that the measuring system is able to measure the natural phenomena properly and the GPD's in the horizontal direction are observed which are assumed to be associated with the volcanic activity of Mt. Sakurajima when the seismometer was active. Index Terms--Electrode, electromagnetic phenomena, magnetometer, volcanic eruptions.

Published
2001

15. Examination of the Influence by the Stimulation Coil Arrangement and the Shape of the Stimulation Object in Transcranial Magnetic Stimulation Using a Model.

Author

OIWA, KOSUKE, YOSHIMATSU, HIROTAKA, NURUKI, ATSUO, YUNOKUCHI, KAZUTOMO, TAMARI, YOZO, and JIMBO, YASUHIKO

Subjects
TRANSCRANIAL magnetic stimulation, ELECTRIC field strength, NEURAL stimulation, EXERCISE physiology, ELECTRIC field therapy
Abstract

SUMMARY Magnetic stimulation is a way of stimulating nervous and muscular tissue with an electric field induced by a stimulation coil and is widely used in evaluation of the nervous system and in the field of exercise physiology. The focality and the deep stimulation efficiency of magnetic stimulation are affected by the coil arrangement and the shape of the stimulated object, since the induced electric field distribution is varied by these factors. In this study, we used a five-layer head model and estimated the induced electric field distribution by calculation. The results indicate that the induced electric field distribution is mostly affected by the boundaries between tissues with different conductivities. [ABSTRACT FROM AUTHOR]

Published
2016
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