A high-temperature superconducting Helmholtz probe for microscopy at 9.4 T

Hurlston, S. E.; Brey, Wallace S.; Suddarth, Steven C.; Johnson, G. Allan

doi:10.1002/(sici)1522-2594(199905)41:5<1032::aid-mrm23>3.0.co;2-x

Cited by 61 publications

(28 citation statements)

References 17 publications

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“…To date the problem of tissue noise has typically been addressed by employing small receiver coils. In an effort to limit the thermal noise voltages intrinsic to the receiver coil, the cryogenic cooling of conventional cooper and high-temperature superconducting coils has been proposed [2][3][4]. This solution provides SNR improvements of a factor of 2-10 for in vivo images obtained at 1.5 T. It is also possible to improve SNR by modifying the pulse sequence but only with compromises in other imaging parameters.…”

Section: Introductionmentioning

confidence: 99%

Chemical-shift micro-imaging of subcutaneous lesions

Weis

Åström

Vinnars

et al. 2005

MAGMA

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A chemical-shift imaging technique was used for the study of small subcutaneous lesions. This study concerns micro-imaging of two females suffering from a tenosynovial giant cell tumor and an epidermal cyst. High-resolution water, fat and chemical-shift artifact-free images were obtained on a whole-body MR unit (1.5 T) equipped with a 23-mm microscopy surface coil and standard gradients (23 mT/m). A significant improvement in signal-to-noise ratio was achieved by reducing the receiver bandwidth to values below +/-10 kHz. The image data sets were acquired with resolution 0.1 x 0.13 mm in the plane, slice thickness 0.5 mm and with acquisition time less than 3 min. Spatial resolution, fat suppression, image texture and edge delineation were improved on spectroscopic images compared with those on conventional MR images.

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Section: Introductionmentioning

confidence: 99%

Chemical-shift micro-imaging of subcutaneous lesions

Weis

Åström

Vinnars

et al. 2005

MAGMA

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“…Compared with HTS coils [9][10][11][12], LN 2 cooled coils provide the advantages of simpler array construction and flexible three-dimensional shapes for volumetric coverage. Although flexible HTS tapes/wires have also been used for RF coils, their superconducting properties degrade rapidly in a high magnetic field [1].…”

Section: Discussionmentioning

confidence: 99%

“…The y include copper coils cooled to liquid nitrogen (LN 2 ) temperature (77 K) [1][2][3][4][5][6] or to liquid helium temperat ure (4.2 K) [7,8] and hightemperature superconducting (HTS) coils [9][10][11][12]. Cryogenic cooling reduces RF coil noise through the lowering of coil resistance (R C ) and coil temperature.…”

Section: Introductionmentioning

confidence: 99%

In vivo MRI using liquid nitrogen cooled phased array coil at 3.0 T

Kwok

You

2006

Magnetic Resonance Imaging

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A liquid nitrogen (LN 2 ) cooled dual-channel array coil was designed and built for use on a 3.0-T whole-body scanner. In vivo imaging of a volunteer's fingers and imaging of a deceased mouse and oil phantom were performed using the LN 2 cooled array and a similar room-temperature coil. Imaging results showed that the LN 2 cooled array provides a signal-to-noise ratio gain of up to 240% as compared with its room-temperature counterpart. LN 2 cooled arrays may be useful for highresolution clinical imaging of joints, skin, eyes and peripheral vessels as well as for biomedical imaging of small animals in human disease modeling.

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“…Our previous work [13] employed a complex thin film pattern with distributed capacitance and inductance between the elements of the thin film, which was difficult to tune. Withers et al [17] and Serfaty et al [18] presented double-sided spiral coils.…”

Section: Simulationsmentioning

confidence: 99%