Ultracompact NMR: 1H Spectroscopy in a Subkilogram Magnet

McDowell, Andrew F.; Fukushima, Eiichi

doi:10.1007/s00723-008-0151-3

Cited by 56 publications

(34 citation statements)

References 24 publications

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“…Finally, it was possible to recover proton spectral information from volumes as large as 1 cm 3 , where sub ppm resolution was achieved. In contrast with previous works, where the strategy to obtain high resolution in portable magnets consisted of reducing the sample volume using micro coils [4,6,7,[21][22][23], the shimming technique described in this paper allowed us to achieve relatively good homogeneity in a magnet volume fraction (sample volume/magnet volume) several orders of magnitude larger than those previously reported. By including variables of control in other magnet geometries, like the one described in [22] is expected to help correcting the field inhomogeneities (mainly of first and second order) allowing to use larger samples or to achieve better homogeneity, factors that would lead to important SNR improvements.…”

Section: Discussioncontrasting

confidence: 52%

Mobile sensor for high resolution NMR spectroscopy and imaging

Danieli

Jörg

Perlo

et al. 2009

Journal of Magnetic Resonance

108

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Section: Discussioncontrasting

confidence: 52%

Mobile sensor for high resolution NMR spectroscopy and imaging

Danieli

Jörg

Perlo

et al. 2009

Journal of Magnetic Resonance

108

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“…The advancement of permanent magnet technology has seen numerous reports of research instruments and a range of commercial products appear on the market that use permanent magnets to produce the uniform static magnetic field for applications in magnetic resonance relaxation time measurements. Examples include single sided or unilateral systems such as the profile NMR-MOUSE [1,2], benchtop MRI systems using magnets in a Halbach arrangement [2,3] and simple sensors using a pair of magnets to define the sensitive region [4][5][6]. The electronics used to collect the MRI signal is often referred to in the literature as a console.…”

Section: Introductionmentioning

confidence: 99%

Cost effective power amplifiers for pulsed NMR sensors

Newton

Hughes‐Riley

Morris

2015

Proceedings of 2nd International Electronic Conference on Sensors and Applications

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Sensors that measure magnetic resonance relaxation times are increasingly finding applications in areas such as food and drink authenticity and waste water treatment control. Modern permanent magnets are used to provide the static magnetic field in many commercial instruments and advances in electronics, such as field programmable gate arrays, have provided lower cost console electronics for generating and detecting the pulse sequence. One area that still remains prohibitively expensive for many sensor applications of pulsed NMR is the requirement for a high frequency power amplifier. With many permanent magnet sensors providing a magnetic field in the 0.25T to 0.5T range, a power amplifier that operates in the 10MHz to 20MHz rage is required. In this work we demonstrate that some low cost commercial amplifiers can be used, with minor modification, to operate as pulsed NMR power amplifiers. We demonstrate two amplifier systems, one medium power that can be constructed for less than Euro 100 and a second much high power system that produces comparable results to commercial pulse amplifiers that are an order of magnitude more expensive. Data is presented using both the commercial NMR MOUSE and a permanent magnet system used for monitoring the clog state of constructed wetlands.

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“…High homogeneity can be achieved by precisely positioning a number of shim pieces of permanent magnets. Different methodologies of passive shimming are being developed by a number of research and development groups, and there have been remarkable improvements in field homogeneity, especially in the fields of portable NMR/MRI with single-sided [11][12][13][14][15][16] and closed [17][18][19][20][21][22] 3 permanent magnets. The details including instrumentations and applications are reviewed elsewhere [23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Magnetic field shimming of a permanent magnet using a combination of pieces of permanent magnets and a single-channel shim coil for skeletal age assessment of children

Terada

Kono

Ishizawa

et al. 2013

Journal of Magnetic Resonance

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We adopted a combination of pieces of permanent magnets and a single-channel (SC) shim coil to shim the magnetic field in a magnetic resonance imaging system dedicated for skeletal age assessment of children. The target magnet was a 0.3-T open and compact permanent magnet tailored to the hand imaging of young children. The homogeneity of the magnetic field was first improved by shimming using pieces of permanent magnets. The residual local inhomogeneity was then compensated for by shimming using the SC shim coil. The effectiveness of the shimming was measured by imaging the left hands of human subjects and evaluating the image quality. The magnetic resonance images for the child subject clearly visualized anatomical structures of all bones necessary for skeletal age assessment, demonstrating the usefulness of combined shimming.

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Ultracompact NMR: 1H Spectroscopy in a Subkilogram Magnet

Cited by 56 publications

References 24 publications

Mobile sensor for high resolution NMR spectroscopy and imaging

Mobile sensor for high resolution NMR spectroscopy and imaging

Cost effective power amplifiers for pulsed NMR sensors

Magnetic field shimming of a permanent magnet using a combination of pieces of permanent magnets and a single-channel shim coil for skeletal age assessment of children

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