A design of permanent magnet array for unilateral NMR device
A design of permanent magnet array for unilateral NMR device
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DOI：
10.1002/cmr.b.20115
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发表时间：
2008-08
影响因子：
0.9
通讯作者：
H. Kato;K. Kishi;N. Takahashi;J. Asaumi;Y. Honda;Y. Yanagi;M. Aoki
中科院分区：
文献类型：
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作者：
H. Kato;K. Kishi;N. Takahashi;J. Asaumi;Y. Honda;Y. Yanagi;M. Aoki
我们设计了一个由不同磁块组成的三维磁路，用于单侧MRI设备，该设备在远程区域产生均匀的磁通密度。主外磁块的磁通密度的方向平行于装置的表面;因此，远程区域中的磁通密度的方向也平行于装置的表面。调整磁块的剩余磁通密度的大小，以使远区中磁通密度的变化最小化。该磁路的外部尺寸为400 mm × 400 mm × 200 mm，在距离器械表面55 mm处的20 mm × 20 mm × 5 mm感兴趣区域内产生的磁通密度为64.5 mT（谐振频率为2.75 MHz），均匀性为275 ppm（带宽为755 Hz）。© 2008 Wiley Periodicals，Inc.概念磁共振部分B（磁共振工程）33 B：201-208，2008
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 × 400 mm × 200 mm, produces a magnetic flux density in a 20 mm × 20 mm × 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). © 2008 Wiley Periodicals, Inc. Concepts Magn Reson Part B (Magn Reson Engineering) 33B: 201–208, 2008