Magnetic field shimming of a permanent magnet using a combination of pieces of permanent magnets and a single-channel shim coil for skeletal age assessment of children
Magnetic field shimming of a permanent magnet using a combination of pieces of permanent magnets and a single-channel shim coil for skeletal age assessment of children
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DOI：
10.1016/j.jmr.2013.02.005
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发表时间：
2013-05-01
影响因子：
2.2
通讯作者：
Kose, K.
中科院分区：
文献类型：
--
作者：
Terada, Y.;Kono, S.;Kose, K.
我们采用了永磁体和单通道（SC）匀场线圈的组合，以匀场的磁共振成像系统专用于骨龄评估的儿童的磁场。目标磁铁是一个0.3 T的开放和紧凑的永磁体，专为幼儿的手部成像。磁场的均匀性首先通过使用永磁体片的匀场来改善。然后通过使用SC匀场线圈进行匀场来补偿残余的局部不均匀性。通过对人类受试者的左手成像并评估图像质量来测量匀场的有效性。儿童受试者的磁共振图像清楚地显示了骨龄评估所需的所有骨骼的解剖结构，证明了组合匀场的有用性。(C)2013 Elsevier Inc. All rights reserved.
We adopted a combination of pieces of permanent magnets and a single-channel (SC) shim coil to shim the magnetic field in a magnetic resonance imaging system dedicated for skeletal age assessment of children. The target magnet was a 0.3-T open and compact permanent magnet tailored to the hand imaging of young children. The homogeneity of the magnetic field was first improved by shimming using pieces of permanent magnets. The residual local inhomogeneity was then compensated for by shimming using the SC shim coil. The effectiveness of the shimming was measured by imaging the left hands of human subjects and evaluating the image quality. The magnetic resonance images for the child subject clearly visualized anatomical structures of all bones necessary for skeletal age assessment, demonstrating the usefulness of combined shimming. (C) 2013 Elsevier Inc. All rights reserved.