A study on optimal coil configurations in a split-type superconducting MRI magnet

Kakugawa, S.; Hino, N.; Komura, Akiyoshi; Kitamura, Masashi; Takeshima, Hiroyuki; Honmei, T.

doi:10.1109/77.783311

Cited by 18 publications

(8 citation statements)

References 5 publications

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“…As we showed [5], since open configuration magnets have less efficiency to produce central magnetic fields compared with conventional cylindrical magnets, magnetomotive force of the former is greater than that of the latter to produce the same central field strength. This makes it difficult to shield stray fields.…”

Section: Introductionmentioning

confidence: 87%

“…The computational method, utilizing linear programming (LP) [8], to obtain a coil configuration with no assumed initial configuration was described in our previous papers [4], [5]. In order to homogenize the internal magnetic field and to get the …”

Section: A Active Shieldingmentioning

confidence: 99%

“…The computational method described above was applied such that we could obtain the configuration of the coils assuming no initial configuration in passive shielded magnets [4], [5]. In order to analyze the electromagnetic characteristics of the iron yoke in 2D, we adopted the equivalent magnetizing current method (EMCM).…”

Section: B Passive and Hybrid Shieldingmentioning

confidence: 99%

“…4 and 5 show the calculation model and our computational procedure, respectively. At first, an air core configuration of coils was optimized by LP [5], [8]. Then, the iron yoke and the coils were analyzed in 2D considering B-H characteristics, and the coefficients due to the iron yoke were computed.…”

Section: B Passive and Hybrid Shieldingmentioning

confidence: 99%

“…In recent years, open configuration MRIs have been developed [1]- [3]. We pointed out the possibility of generating highly homogeneous magnetic fields in open-type magnets by alternately arranging coils with positive and negative currents in our previous papers [4], [5].…”

Section: Introductionmentioning

confidence: 98%

See 4 more Smart Citations

Shielding Stray Magnetic Fields of Open High Field MRI Magnets

Kakugawa

Hino

Komura

et al. 2004

IEEE Trans. Appl. Supercond.

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We have developed a new magnet for open high field (0.7 T) MRI systems. Since MRI systems are installed in hospital sites, it is important to reduce stray magnetic fields of the magnets. We studied passive, active and hybrid shielding methods and compared them. In order to study feasibility of active shielding, we considered higher order multipole stray fields. We present details of the calculation method and the results.Index Terms-Linear programming, magnetic resonance imaging (MRI), multipole stray field, optimization.

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Section: Introductionmentioning

confidence: 87%

Section: A Active Shieldingmentioning

confidence: 99%

Section: B Passive and Hybrid Shieldingmentioning

confidence: 99%

Section: B Passive and Hybrid Shieldingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

See 3 more Smart Citations

Shielding Stray Magnetic Fields of Open High Field MRI Magnets

Kakugawa

Hino

Komura

et al. 2004

IEEE Trans. Appl. Supercond.

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Globally optimal, minimum stored energy, double‐doughnut superconducting magnets

Tieng

Vegh

Brereton

2009

Magnetic Resonance in Med

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The use of the minimum stored energy current density mapbased methodology of designing closed-bore symmetric superconducting magnets was described recently. The technique is further developed to cater for the design of interventional-type MRI systems, and in particular open symmetric magnets of the double-doughnut configuration. This extends the work to multiple magnet domain configurations. The use of double-doughnut magnets in MRI scanners has previously been hindered by the ability to deliver strong magnetic fields over a sufficiently large volume appropriate for imaging, essentially limiting spatial resolution, signal-to-noise ratio, and field of view. The requirement of dedicated interventional space restricts the manner in which the coils can be arranged and placed. The minimum stored energy optimal coil arrangement ensures that the field strength is maximized over a specific region of imaging. The design method yields open, dualdomain magnets capable of delivering greater field strengths than those used prior to this work, and at the same time it provides an increase in the field-of-view volume. Simulation results are provided for 1-T double-doughnut magnets with at least a 50-cm 1-ppm (parts per million) field of view and 0.7-m gap between the two doughnuts. Magn Reson Med 63:262-267,

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Compact Superconducting Magnet Design for Nuclear Magnetic Resonance

Tieng

Vegh

2012

Annual Reports on NMR Spectroscopy

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A study on optimal coil configurations in a split-type superconducting MRI magnet

Cited by 18 publications

References 5 publications

Shielding Stray Magnetic Fields of Open High Field MRI Magnets

Shielding Stray Magnetic Fields of Open High Field MRI Magnets

Globally optimal, minimum stored energy, double‐doughnut superconducting magnets

Compact Superconducting Magnet Design for Nuclear Magnetic Resonance

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