A design of permanent magnet array for unilateral NMR device

Hirokazu Kato, Kanji Kishi, Norio Takahashi, Jun Ichi Asaumi, Yasutoshi Honda, Yoshinobu Yanagi, Masaaki Aoki

研究成果査読

11 被引用数 (Scopus)

抄録

We have designed a three-dimensional magnetic circuit consisting of various pieces of magnetic blocks for a unilateral MRI device, which generates a homogeneous magnetic flux density at a remote region. The direction of the remanent flux density of the main outer magnetic blocks is parallel to the surface of the device; hence the direction of the magnetic flux density in the remote region is also parallel to the surface of the device. The magnitudes of the remanent flux density of the magnetic blocks are adjusted so as to minimize the variation of the magnetic flux density in the remote region. This magnetic circuit, with an outer dimension of 400 mm x 400 mm x 200 mm, produces a magnetic flux density in a 20 mm x 20 mm x 5 mm region of interest at a distance of 55 mm from the surface of the device with a magnitude of 64.5 mT (2.75 MHz in resonant frequency) and a uniformity of 275 ppm (755 Hz in band width).

本文言語English
ページ(範囲)201-208
ページ数8
ジャーナルConcepts in Magnetic Resonance Part B: Magnetic Resonance Engineering
33
3
DOI
出版ステータスPublished - 8月 2008

ASJC Scopus subject areas

  • 放射線技術および超音波技術
  • 放射線学、核医学およびイメージング
  • 分光学
  • 物理化学および理論化学

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