Design of a mobile, homogeneous, and efficient electromagnet with a large field of view for neonatal low-field MRI.
Design of a mobile, homogeneous, and efficient electromagnet with a large field of view for neonatal low-field MRI.
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DOI：
10.1007/s10334-016-0525-8
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发表时间：
2016-08
期刊：
影响因子：
--
通讯作者：
Fidler F
中科院分区：
文献类型：
--
作者：
Lother S;Schiff SJ;Neuberger T;Jakob PM;Fidler F
In this work, a prototype of an effective electromagnet with a field-of-view (FoV) of 140 mm for neonatal head imaging is presented. The efficient implementation succeeded by exploiting the use of steel plates as a housing system. We achieved a compromise between large sample volumes, high homogeneity, high B0 field, low power consumption, light weight, simple fabrication, and conserved mobility without the necessity of a dedicated water cooling system. The entire magnetic resonance imaging (MRI) system (electromagnet, gradient system, transmit/receive coil, control system) is introduced and its unique features discussed. Furthermore, simulations using a numerical optimization algorithm for magnet and gradient system are presented. Functionality and quality of this low-field scanner operating at 23 mT (generated with 500 W) is illustrated using spin-echo imaging (in-plane resolution 1.6 mm × 1.6 mm, slice thickness 5 mm, and signal-to-noise ratio (SNR) of 23 with a acquisition time of 29 min). B0 field-mapping measurements are presented to characterize the homogeneity of the magnet, and the B0 field limitations of 80 mT of the system are fully discussed. The cryogen-free system presented here demonstrates that this electromagnet with a ferromagnetic housing can be optimized for MRI with an enhanced and homogeneous magnetic field. It offers an alternative to pre-polarized MRI designs in both readout field strength and power use. There are multiple indications for the clinical medical application of such low-field devices.
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DOI：
10.1088/0022-3735/22/9/017
发表时间：
1989-09-01
期刊：
JOURNAL OF PHYSICS E-SCIENTIFIC INSTRUMENTS
影响因子：
--
作者：
DONASCIMENTO, GC;DESOUZA, RE;ENGELSBERG, M
通讯作者：
ENGELSBERG, M
影响因子：
1.6
作者：
Mohoric, A;Planinsic, G;Stepisnik, J
通讯作者：
Stepisnik, J
影响因子：
2.2
作者：
Mohoric, A;Stepisnik, J;Planinsic, G
通讯作者：
Planinsic, G
影响因子：
10.6
作者：
SEKIHARA, K;MATSUI, S;KOHNO, H
通讯作者：
KOHNO, H
影响因子：
5.9
作者：
Savnik, A;Malmskov, H;Bliddal, H
通讯作者：
Bliddal, H