Passive shimming of the superconducting magnet for MRI

Белов, А. В.; Bushuev, V.; Emelianov, M.; Eregin, V.E.; Severgin, Yu.P.; Sytchevski, S.; Vasiliev, V.

doi:10.1109/77.402639

Cited by 43 publications

(22 citation statements)

References 4 publications

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“…One can afford the use of very small shim pieces to correct for the imperfections of the magnet. Adding small pieces of ferromagnetic material to the magnet in order to compensate its inhomogeneities is a standard procedure in MRI [30,31] and was further developed for permanent magnets [32]. We adapted this method to serve our purpose in this example.…”

Section: Correction Systemmentioning

confidence: 99%

Design of arbitrarily homogeneous permanent magnet systems for NMR and MRI: Theory and experimental developments of a simple portable magnet

Hugon

d'Amico

Aubert

et al. 2010

Journal of Magnetic Resonance

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Section: Correction Systemmentioning

confidence: 99%

Design of arbitrarily homogeneous permanent magnet systems for NMR and MRI: Theory and experimental developments of a simple portable magnet

Hugon

d'Amico

Aubert

et al. 2010

Journal of Magnetic Resonance

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“…W HEN a superconducting magnet generating highly homogeneous magnetic field, such as MRI and NMR, is designed, it is necessary to compensate a magnetic field around the center with passive and/or active shimming [1]. Passive shimming is often employed to compensate the magnetic field using some pieces of iron.…”

Section: Introductionmentioning

confidence: 99%

Passive Shimming for Magic-Angle-Spinning NMR

Noguchi

Hahn

Iwasa

2014

IEEE Trans. Appl. Supercond.

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Abstract-The superconducting dipole magnets wound with HTS wires have been developed for a magic-angle-spinning NMR. The magnetic field of the dipole magnets is tilted from z-axis. Since the highly homogeneous magnetic field is required, the magnetic field of the dipole magnets is necessarily compensated by passive and/or active shimming. However, the compensation of all the components has not been reported. Usually, due to the axial symmetry of a solenoid magnet, only z component of the magnetic field is homogenized. In this paper, all the x, y, and z components of the magnetic field generated by the superconducitng dipole magnet are compensated because of the tilt from the z-axis.

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“…The former employs the magnetic field created by currentcarrying coils to offset the inhomogeneous magnetic field components of special harmonics in the imaging region [1,2]. As for the latter, many small shims made of permanent magnet are fixed on the two pole-surfaces of the main magnet [3]. The inhomogeneous magnetic component in the imaging region can be compensated through the magnetic field created by the small magnet sheet array [4,5].…”

Section: Introductionmentioning

confidence: 99%

Study on Shimming Method for Open Permanent Magnet of Mri

Ren¹,

Xie²,

Li³

2009

PIER M

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Abstract-The shimming method used for producing high field homogeneity of the open permanent main magnet for magnetic resonance imaging (MRI) is researched in this paper. The central shimming method based on integer programming is proposed, which fulfills the combination of optimal theory and the practical manual shimming. The formulation of shimming is solved by using Lingo software and the numerical analysis method is used to compute the contribution of small shim arrays. The homogeneity of imaging region is eventually advanced by 50%. The validity of the method is verified by using simulation test of two magnets with different basic magnetic fields. The efficiency of shimming is improved through actual measuring experiment corporated with the manufacturing enterprise.

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Passive shimming of the superconducting magnet for MRI

Cited by 43 publications

References 4 publications

Design of arbitrarily homogeneous permanent magnet systems for NMR and MRI: Theory and experimental developments of a simple portable magnet

Design of arbitrarily homogeneous permanent magnet systems for NMR and MRI: Theory and experimental developments of a simple portable magnet

Passive Shimming for Magic-Angle-Spinning NMR

Study on Shimming Method for Open Permanent Magnet of Mri

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