Sodium 3-D MRI of the human torso using a volume coil

Steidle, Günter; Graf, Hansjörg; Schick, Fritz

doi:10.1016/j.mri.2003.08.007

Cited by 34 publications

(81 citation statements)

References 15 publications

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“…Although conventional MRI relies on imaging proton nuclei in water, MRI can also be performed on more physiologically relevant nuclei such as sodium ( 23 Na) and Phosphorus ( 31 P) among others. Sodium MRI is a highly accurate and specific technique for assessing various pathologies, and it has been applied to in vivo applications to image heart infarction, brain, and spine [27][28][29]. Sodium MRI has been validated as a tool for quantitative measurement of the proteoglycan content via a measurement of tissue fixed charge density (FCD) which correlates to the amount of proteoglycan present [30,31].…”

Section: Sodium Mrimentioning

confidence: 99%

Advances in Magnetic Resonance Imaging for the Assessment of Degenerative Disc Disease of the Lumbar Spine

Wang

Auerbach

Witschey

et al. 2007

Seminars in Spine Surgery

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The intervertebral disc is characterized by a tension-resisting annulus fibrosus, and a compressionresisting nucleus pulposus composed largely of proteoglycan. Both the annulus and the nucleus function in concert to provide the disc with mechanical stability. Early disc degeneration begins in the nucleus with proteoglycan depletion. Quantitative MRI techniques have been developed to noninvasively quantify the earliest degenerative changes that occur within the disc. Our ability to identify and quantify these early biochemical changes will provide a better understanding of the pathophysiology of disc degeneration and facilitate the study of interventions that aim to halt or reverse the degenerative process.

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Section: Sodium Mrimentioning

confidence: 99%

Advances in Magnetic Resonance Imaging for the Assessment of Degenerative Disc Disease of the Lumbar Spine

Wang

Auerbach

Witschey

et al. 2007

Seminars in Spine Surgery

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“…Equation [5] is basically the same as a well-known result (35) for lower-frequency performance of a dual-mode single coil. It should be noted that in our particular case, the inductor value used was much smaller than the inductance of lowgamma loop coil.…”

Section: Discussionmentioning

confidence: 68%

“…However, in certain cases (such as could be presented when using a microcoil as the low-gamma coil), it could be possible to build a trap whose inductance is higher than the coil itself, leading to degradation in the achievable SNR regardless of the relative Q values, as Eq. [5] shows.…”

Section: Discussionmentioning

confidence: 97%

“…[7]) is improved by increased inductance, the performance of the 31 P coil (Eq. [5]) is actually degraded by increasing the trap inductance L t . A (mild) design compromise therefore must be made with regard to choice of the inductor value, depending on whether performance at the 31 P or 1 H frequency needs to be optimized.…”

Section: Discussionmentioning

confidence: 99%

“…10). Equations [5] and [7] can be used by designers to pick the inductor most suitable for the application in hand.…”

Section: Discussionmentioning

confidence: 99%

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Trap design for insertable second‐nuclei radiofrequency coils for magnetic resonance imaging and spectroscopy

Dabirzadeh

McDougall

2009

Concepts Magn Reson

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ABSTRACT:The application of nuclear magnetic resonance spectroscopy in metabolic studies usually includes concurrent operation at two different frequencies to enable excitation and detection of two different nuclei. When using separate radiofrequency coils for the multinuclear excitation, coupling between the two coils has been shown to be a problem, resulting in resonance frequency shifting and reduced sensitivity of the 1 H coil. Among the methods to reduce this coupling is the placement of an 1 H trap on the second-nuclei coil. This article presents the benefits of this method, specifically in this case for 31 P imaging/spectroscopy, through modeling results, bench measurements, imaging, and spectra acquisition. The use of a resonant trap in conjunction with a modular design permitted the insertion of the phosphorus coil as an ' 'add-on' ' into multiple existing proton coils, suggesting particular applicability in the high-field arena, where spectroscopy holds great promise, but where proton coil design complexity exists that is not easily re-engineered for dual-nuclei use.

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Sodium Magnetic Resonance Imaging and its Bioscale of Tissue Sodium Concentration

Atkinson

Thulborn

1996

eMagRes

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Sodium 3-D MRI of the human torso using a volume coil

Cited by 34 publications

References 15 publications

Advances in Magnetic Resonance Imaging for the Assessment of Degenerative Disc Disease of the Lumbar Spine

Advances in Magnetic Resonance Imaging for the Assessment of Degenerative Disc Disease of the Lumbar Spine

Trap design for insertable second‐nuclei radiofrequency coils for magnetic resonance imaging and spectroscopy

Sodium Magnetic Resonance Imaging and its Bioscale of Tissue Sodium Concentration

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