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21 results on '"Yoshikawa, Koki"'

5. Neuronal Current Distribution Imaging Using Magnetic Resonance

Author

Kamei, Hirotake, Iramina, Keiji, Yoshikawa, Koki, and Ueno, Shoogo

Subjects
Magnetic resonance imaging -- Methods, Cerebral cortex -- Research, Magnetic fields -- Measurement, Neural circuitry -- Research, Business, Electronics, Electronics and electrical industries
Abstract

A new functional magnetic resonance imaging (fMRI) technique to visualize the distribution of neuronal currents in the human brain was developed. Measurements of the internal magnetic field deformation caused by an electric current dipole in a phantom were performed using a method based on the microscopic magnetic resonance imaging technique. The minimal value of the current dipole moment detected by the present method was determined to be 90 nAm. The technique was applied to obtain maps of human brain activity by using motor and sensory stimulus paradigms. Measurements were made with an EPI sequence at 1.5T. Intensity changes, resulting from causes other than neuronal currents, were eliminated by editing functional images obtained with field gradients of different polarities. MRI mapping of the neuronal currents in the brain during middle finger and thumb tapping was clearly obtained. Index Terms--functional MRI, magnetic resonance imaging, neuronal current

Published
1999

16. Clinical Application of AMI-25 (Superparamagnetic iron oxide) for the MR imaging of Hepatic Tumors : A Multicenter Clinical Phase III Study

Author

ヨシカワ, コウキ, ササキ, ヤスヒト, オガワ, ノブヤ, サクマ, サダユキ, Yoshikawa, Koki, Sasaki, Yasuhito, Ogawa, Nobuya, Sakuma, Sadayuki, 吉川, 宏起, 佐々木, 康人, 小川, 暢也, 佐久間, 貞行, ヨシカワ, コウキ, ササキ, ヤスヒト, オガワ, ノブヤ, サクマ, サダユキ, Yoshikawa, Koki, Sasaki, Yasuhito, Ogawa, Nobuya, Sakuma, Sadayuki, 吉川, 宏起, 佐々木, 康人, 小川, 暢也, and 佐久間, 貞行

Published
1994

17. Thin-Section Computed Tomography of the Normal Minor Fissure

Author

マツオカ, ユウジロウ, オヤマ, カズユキ, オオトモ, クニ, オオクボ, トシユキ, ニシカワ, ジュンイチ, コジマ, カオル, アオキ, ユキマサ, コグレ, タカシ, ヒラカワ, ケン, ヨシカワ, コウキ, イイオ, マサヒロ, Matsuoka, Yujiro, Oyama, Kazuyuki, Ohtomo, Kuni, Okubo, Toshiyuki, Nishikawa, Junichi, Kojima, Kaoru, Aoki, Yukimasa, Kogure, Takashi, Hirakawa, Ken, Yoshikawa, Koki, Iio, Masahiro, 松岡, 勇二郎, 小山, 和行, 大友, 邦, 大久保, 敏之, 西川, 潤一, 小嶋, 馨, 青木, 幸昌, 小暮, 喬, 平川, 賢, 吉川, 宏起, 飯尾, 正宏, マツオカ, ユウジロウ, オヤマ, カズユキ, オオトモ, クニ, オオクボ, トシユキ, ニシカワ, ジュンイチ, コジマ, カオル, アオキ, ユキマサ, コグレ, タカシ, ヒラカワ, ケン, ヨシカワ, コウキ, イイオ, マサヒロ, Matsuoka, Yujiro, Oyama, Kazuyuki, Ohtomo, Kuni, Okubo, Toshiyuki, Nishikawa, Junichi, Kojima, Kaoru, Aoki, Yukimasa, Kogure, Takashi, Hirakawa, Ken, Yoshikawa, Koki, Iio, Masahiro, 松岡, 勇二郎, 小山, 和行, 大友, 邦, 大久保, 敏之, 西川, 潤一, 小嶋, 馨, 青木, 幸昌, 小暮, 喬, 平川, 賢, 吉川, 宏起, and 飯尾, 正宏

Published
1990

19. Japanese Journal of Radiological Technology

Author

Yagi, Kazuo, primary, Ito, Kunio, additional, Doyama, Masao, additional, Ito, Masamitu, additional, Yoshikawa, Koki, additional, Iio, Masahiro, additional, Yamai, Satoshi, additional, Miyazaki, Toshiyuki, additional, Uejima, Yasuyuki, additional, Iriguchi, Norio, additional, and Maki, Takeshi, additional

Published
1987
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