Magnetic resonance imaging of objects with dipolar-broadened spectra using soft excitation pulses

Kim, Mi Jung; Khitrin, A. K.

doi:10.1016/j.mri.2005.07.003

Cited by 5 publications

(2 citation statements)

References 30 publications

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“…Some time ago, we have found [5][6][7][8] that long and weak excitation pulses can produce extremely sharp response signals in many substances with dipolar-broadened NMR lines. It has been also demonstrated that such long-lived coherent response signals can be efficiently used for high-resolution MRI of solids [9,10] or studying diffusion in liquid crystals [11]. Qualitatively, generation of such signals was explained as a result of partial saturation [7].…”

Section: Introductionmentioning

confidence: 99%

Selective excitation of homogeneous spectral lines

Khitrin

2011

The Journal of Chemical Physics

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Section: Introductionmentioning

confidence: 99%

Selective excitation of homogeneous spectral lines

Khitrin

2011

The Journal of Chemical Physics

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“…In solids or rigid tissues, the signals are short-lived, and the spectrum is 3–5 orders of magnitude broader than in liquids. Therefore, when the gradient strengths are limited, like in in vivo imaging, the linewidth becomes the limiting factor for resolution [15]. …”

Section: Introductionmentioning

confidence: 99%

Low-power slice selective imaging of broad signals

Yang

Lee

Kharkov

et al. 2016

Journal of Magnetic Resonance

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One of the major challenges in using magnetic resonance imaging (MRI) to study immobile samples, such as solid materials or rigid tissues like bone or ligaments, is that the images appear dark due to these samples short-lived signals. Although it is well known that narrowband signals can be excited in inhomogeneously-broadened lines, it is less well known that similar effects can be observed in dipolar-broadened systems. These long-lived signals have not been used much, mainly because their description frequently does not match intuition. While 3D imaging with these signals has previously been reported, here we focus on the demonstration of faster, 2D slice-selective imaging. The faster imaging provides more flexibility for visualizing these rigid objects, an approach that is not compatible with ultra-short echo time (UTE) techniques. We also focus on the frequently-encountered regime where the maximum power achievable for rf pulses is significantly weaker than the linewidth. This regime is typically encountered in clinical MRI scanning or large volume setups. When compared to UTE and conventional slice-selective spin echo, this technique provides better representations of the sample, and provides higher signal-to-noise ratios than spin-echo techniques in both the high and low power regimes for the eraser sample.

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NMR Study of Self-Diffusion

Khitrin

Thermotropic Liquid Crystals

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Magnetic resonance imaging of objects with dipolar-broadened spectra using soft excitation pulses

Cited by 5 publications

References 30 publications

Selective excitation of homogeneous spectral lines

Selective excitation of homogeneous spectral lines

Low-power slice selective imaging of broad signals

NMR Study of Self-Diffusion

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