Development of a magnetic resonance microscope using a high Tc bulk superconducting magnet

Ogawa, Kento; Nakamura, Takashi; Terada, Yasuhiko; Kose, Katsumi; Haishi, Tomoyuki

doi:10.1063/1.3598440

Cited by 87 publications

(50 citation statements)

References 9 publications

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“…These achievements are very attractive for applications. Indeed, the first magnetic resonance (MR) microscope using bulk superconductor magnets have been reported [37]. The inhomogeneity of the trapped magnetic field in the cylindrical region ( 6.2 mm×9.1 mm) is sufficiently low value of 3.1 ppm, which allows to capture MR images of a mouse embryo.…”

Section: Resultsmentioning

confidence: 99%

Nanocomposite RE-Ba-Cu-O Bulk Superconductors

Iida

2015

Oxide Thin Films, Multilayers, and Nanocomposites

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Nanocomposite oxide high-temperature bulk superconductors can be used as "quasi-magnets". Thanks to the recent progress of material processing, "quasi-magnet" with 26 mm diameter can generate a large field of 17.6 T at 26 K. These results are highly attractive for applications, involving levitation of permanent magnets on the bulk superconductors. Indeed, several other applications such as motors and magnetic resonance microscope using bulk superconductors have been proposed and demonstrated. In this chapter, we describe several techniques to improve the magnetic properties for bulk superconductors together with some basics such as phase diagrams and solidifications.

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Section: Resultsmentioning

confidence: 99%

Nanocomposite RE-Ba-Cu-O Bulk Superconductors

Iida

2015

Oxide Thin Films, Multilayers, and Nanocomposites

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“…The linewidth of the NMR spectrum was about 228 kHz (~1850 ppm) [15]. The homogeneity of the HTS bulk magnets was further improved [16] and we reported the first MR images using an HTS bulk magnet in 2011 [17]. The homogeneity of the magnetic field for the MRI magnet was 37 ppm peak-to-peak in the central cylindrical region with 6.2 mm diameter and 9.1 mm length.…”

Section: Introductionmentioning

confidence: 93%

“…Figure 1 shows the superconducting bulk magnets used in this study. The bulk material consisted of c-axis oriented single-domain Eu-Ba-Cu-O crystals with a superconducting transition temperature of 93 K [18], which was used in a previous study [17]. There were several candidate materials for the bulk magnet, Y-Ba-Cu-O, Sm-Ba-Cu-O, Eu-Ba-Cu-O, and Gd-Ba-Cu-O.…”

Section: Introductionmentioning

confidence: 99%

Development of a superconducting bulk magnet for NMR and MRI

Nakamura

Tamada

Yanagi³

et al. 2015

Journal of Magnetic Resonance

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111

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A superconducting bulk magnet composed of six vertically stacked annular single-domain c-axis-oriented Eu-Ba-Cu-O crystals was energized to 4.74 T using a conventional superconducting magnet for high-resolution NMR spectroscopy. Shim coils, gradient coils, and radio frequency coils for high resolution NMR and MRI were installed in the 23 mm-diameter room-temperature bore of the bulk magnet. A 6.9 ppm peak-to-peak homogeneous region suitable for MRI was achieved in the central cylindrical region (6.2 mm diameter, 9.1 mm length) of the bulk magnet by using a single layer shim coil. A 21 Hz spectral resolution that can be used for high resolution NMR spectroscopy was obtained in the central cylindrical region (1.3 mm diameter, 4 mm length) of the bulk magnet by using a multichannel shim coil. A clear 3D MR image dataset of a chemically fixed mouse fetus with (50 μm)(3) voxel resolution was obtained in 5.5 h. We therefore concluded that the cryogen-free superconducting bulk magnet developed in this study is useful for high-resolution desktop NMR, MRI and mobile NMR device.

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“…A lot of projects on development of magnetic suspension, separators, and storage devices based on V. S. Korotkov vasmephi@mail.ru 1 Research Center Kurchatov Institute, 123182 Moscow, Russia 2 MIPT, 141700 Dolgoprudny, Russia these materials were proposed [1]. Magnetic systems for portable and low-cost EPR and NMR spectrometers can be promising applications as well [2,3].…”

Section: Introductionmentioning

confidence: 99%

Pulse Heating and Negative Magnetic Relaxation on Bulk HTS Annuli

Korotkov

Krasnoperov

Kartamyshev

2015

J Supercond Nov Magn

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Negative magnetic relaxation (S < 0) can be observed in pulsed field magnetization of superconducting single-domain annuli (rings of rectangular cross section) under certain conditions. The radial distributions of the local temperature and of the trapped magnetic field were investigated when the negative relaxation is realized. The relaxation rates calculated from these data are in a good agreement with the observed values. Numerical calculations show that the negative relaxation is realized due to the radial temperature gradient.

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Development of a magnetic resonance microscope using a high Tc bulk superconducting magnet

Cited by 87 publications

References 9 publications

Nanocomposite RE-Ba-Cu-O Bulk Superconductors

Nanocomposite RE-Ba-Cu-O Bulk Superconductors

Development of a superconducting bulk magnet for NMR and MRI

Pulse Heating and Negative Magnetic Relaxation on Bulk HTS Annuli

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