Journal ArticleDOI
Snapshot FLASH MRI. Applications to T1, T2, and chemical-shift imaging.
TLDR
Extensions to real‐time MRI of blood vessels, diffusion coefficients, combination with two‐dimensional MR spectroscopy experiments, and other nuclei are discussed.Abstract:
Snapshot FLASH magnetic resonance imaging techniques have been developed to enable real-time imaging of MR parameters. The first realization of the method is based on a 64 × 128 FLASH tomogram acquired within 200 ms, using improved MR system hardware conditions. The soft tissue contrast obtained in FLASH MRI almost disappears by using flip angles of less than 5° and repetition times of 3 ms. This work describes extensions of FLASH MRI placing conventional MR experiments before the whole imaging sequence. This creates images of any desired contrast without changing the measuring time. Examples of inversion-recovery T1, spin-echo T2, chemical-shift-selective, and spectroscopic FLASH MRI are presented. Further extensions to real-time MRI of blood vessels, diffusion coefficients, combination with two-dimensional MR spectroscopy experiments, and other nuclei are discussed.read more
Citations
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Journal ArticleDOI
Three-dimensional magnetization-prepared rapid gradient-echo imaging (3D MP RAGE)
TL;DR: A new three‐dimensional imaging technique which is applicable for 3D MR imaging throughout the body is introduced and high‐quality 3D image sets of the abdomen and head are acquired.
Journal ArticleDOI
7T vs. 4T: RF power, homogeneity, and signal-to-noise comparison in head images.
J. T Vaughan,Michael Garwood,Christopher M. Collins,Wanzhan Liu,Lance DelaBarre,Gregor Adriany,Peter Andersen,Hellmut Merkle,Rainer Goebel,Michael B. Smith,Kamil Ugurbil +10 more
TL;DR: Signal‐to‐noise ratio (SNR), RF field (B1), and RF power requirement for human head imaging were examined at 7T and 4T magnetic field strengths and were consistent with calculations performed using a human head model and Maxwell's equations.
Journal ArticleDOI
Principles and applications of balanced SSFP techniques
Klaus Scheffler,S. Lehnhardt +1 more
TL;DR: The physical principles, on the signal formation, and on the resulting properties of balanced SSFP are discussed, and mechanisms for contrast modification, recent clinical application, and potential extensions of this technique are discussed.
Journal ArticleDOI
Measuring cerebral blood flow using magnetic resonance imaging techniques
TL;DR: Magnetic resonance imaging techniques measuring CBF have developed rapidly in the last decade, resulting in a wide range of available methods and this review discusses their principles, possible pitfalls, and potential for absolute quantification and outlines clinical and neuroscientific applications.
Journal ArticleDOI
Experimentally-derived functional form for a population-averaged high-temporal-resolution arterial input function for dynamic contrast-enhanced MRI.
Geoffrey J. M. Parker,Caleb Roberts,Andrew S. MacDonald,Giovanni A Buonaccorsi,Susan Cheung,David L. Buckley,Alan Jackson,Yvonne Watson,Karen Davies,Gordon C Jayson +9 more
TL;DR: Rapid T1‐weighted 3D spoiled gradient‐echo data sets were acquired in the abdomen of 23 cancer patients during a total of 113 separate visits to allow dynamic contrast‐enhanced MRI (DCE‐MRI) analysis of tumor microvasculature to indicate the potential for increased sensitivity to therapy‐induced change.
References
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Journal ArticleDOI
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E. O. Stejskal,J. E. Tanner +1 more
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Journal ArticleDOI
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TL;DR: Based on the principles of echo imaging, a method is proposed to acquire sufficient data for a 256 × 256 image in from 2 to 40s, and the signal amplitudes of structures with long T2 are nearly the same as those in a conventional 2D FT experiment.
Journal ArticleDOI
Multi-planar image formation using nmr spin echoes.
TL;DR: In this paper, a two-dimensional spin density imaging by nuclear magnetic resonance (NMR) is proposed, which exploits the properties of spin echoes in time-dependent magnetic field gradients.
Journal ArticleDOI
FLASH imaging rapid NMR imaging using low flip-angle pulses
TL;DR: A new method for rapid NMR imaging dubbed FLASH ( fast low-a ngle sh ot) imaging is described which allows measuring times of the order of 1 s (64 × 128 pixel resolution) or 6 s (256 × 256 pixels), resulting in about a 100-fold reduction in measuring time without sacrificing spatial resolution.
Journal ArticleDOI
1H NMR Chemical shift selective (CHESS) imaging
TL;DR: A chemical shift selective (CHESS) imaging technique which destroys the unwanted signal component by means of a selective 90 degrees excitation pulse and a subsequent magnetic field gradient ('homogeneity spoiling gradient') prior to imaging of the wanted component.