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Showing 1 to 12 of 578 entries
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Single-input double-tuned Foster-type probe circuit.

Magnetic resonance in medicine

Kan S, Jehenson P, Leroy-Willig A.
PMID: 1625568
Magn Reson Med. 1992 Jul;26(1):7-15. doi: 10.1002/mrm.1910260103.

Synthesizing two different values of inductance from a given sample coil for use in a single-input double-tuned circuit is possible by means of three extra LC elements. A detailed analysis with derived equations shows how to calculate the circuit...

A continuously variable field of view surface coil.

Magnetic resonance in medicine

Duensing R, Fitzsimmons J, Sanford D, Vazquez J.
PMID: 2325538
Magn Reson Med. 1990 Mar;13(3):378-84. doi: 10.1002/mrm.1910130305.

A new type of surface coil is described which allows the user to continuously vary the size of the field of view. This utilizes a modified radiofrequency trombone for size adjustment that results in a stable frequency over a...

Power deposition and noise correlation in NMR samples.

Magnetic resonance in medicine

Carlson JW.
PMID: 2733595
Magn Reson Med. 1989 Jun;10(3):399-403. doi: 10.1002/mrm.1910100311.

A general solution for the power deposited in an NMR sample by an rf coil is presented. The result is simplified in the long wavelength, long skin depth approximation. This formalism is used to derive an expression for noise...

Snapshot FLASH MRI. Applications to T1, T2, and chemical-shift imaging.

Magnetic resonance in medicine

Haase A.
PMID: 2319937
Magn Reson Med. 1990 Jan;13(1):77-89. doi: 10.1002/mrm.1910130109.

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 X 128 FLASH tomogram acquired within 200 ms, using improved MR system...

A study of optimization of the complex hyperbolic secant inversion pulses.

Magnetic resonance in medicine

Mao J, Virapongse C, Fitzsimmons JR.
PMID: 2314217
Magn Reson Med. 1990 Feb;13(2):293-8. doi: 10.1002/mrm.1910130211.

The conjugate gradient method is used to optimize the inversion slice profile produced by complex hyperbolic secant selective pulses. An improved quality is obtained for the inversion slice profile at a price, however, of a lower immunity to the...

Two-dimensional selective adiabatic pulses.

Magnetic resonance in medicine

Conolly S, Pauly J, Nishimura D, Macovski A.
PMID: 1569869
Magn Reson Med. 1992 Apr;24(2):302-13. doi: 10.1002/mrm.1910240211.

Using the technique of separable k-space excitation, we have designed a two-dimensional selective adiabatic pulse that inverts magnetization from a square region in the xy plane with insensitivity to RF variations. We also have designed a two-dimensional adiabatic pulse...

A new approach to split resonator design.

Magnetic resonance in medicine

Harpen MD.
PMID: 1569874
Magn Reson Med. 1992 Apr;24(2):364-9. doi: 10.1002/mrm.1910240217.

Using a novel application of the method of images we show how a plane array of resonant elements can be substituted for the conducting plane in a semicylindrical or split resonator. In an experimental low-pass split resonator-plane array system...

Measurement of proton resonance frequency shift coefficient during MR-guided focused ultrasound on Thiel embalmed tissue.

Magnetic resonance in medicine

Karakitsios I, Dogadkin O, Le N, Melzer A.
PMID: 25056821
Magn Reson Med. 2015 Jul;74(1):260-265. doi: 10.1002/mrm.25378. Epub 2014 Jul 23.

PURPOSE: To estimate the value of proton resonance frequency (PRF) shift coefficient of explanted Thiel embalmed animal and human tissue used as a preclinical model for treatment with MR-guided focused ultrasound (FUS).METHODS: Thiel embalmed human liver, ovine liver, and...

Dural Enhancement in a Patient with Sturge-Weber Syndrome Revealed by Double Inversion Recovery Contrast Using Synthetic MRI.

Magnetic resonance in medical sciences : MRMS : an official journal of Japan Society of Magnetic Resonance in Medicine

Hagiwara A, Nakazawa M, Andica C, Tsuruta K, Takano N, Hori M, Suzuki H, Sugano H, Arai H, Aoki S.
PMID: 26549162
Magn Reson Med Sci. 2016;15(2):151-2. doi: 10.2463/mrms.ci.2015-0066. Epub 2015 Nov 06.

No abstract available.

Cerebellum Tissue Segmentation with Ensemble Sparse Learning.

Proceedings of the International Society for Magnetic Resonance in Medicine ... Scientific Meeting and Exhibition. International Society for Magnetic Resonance in Medicine. Scientific Meeting and Exhibition

Chen J, Wang L, Shen D.
PMID: 29118678
Proc Int Soc Magn Reson Med Sci Meet Exhib Int Soc Magn Reson Med Sci Meet Exhib. 2017 Apr;25.

No abstract available.

Dedicated receiver array coil for .

Magnetic resonance in medicine

Rao M, Robb F, Wild JM.
PMID: 25078266
Magn Reson Med. 2015 Jul;74(1):291-299. doi: 10.1002/mrm.25384. Epub 2014 Jul 30.

PURPOSE: Same-breath acquisition of THEORY AND METHODS: A four-loop dedicated receiver-array was developed in-house for RESULTS: The CONCLUSION: An array coil to improve

Paradoxical effect of the signal-to-noise ratio of GRAPPA calibration lines: A quantitative study.

Magnetic resonance in medicine

Ding Y, Xue H, Ahmad R, Chang TC, Ting ST, Simonetti OP.
PMID: 25078425
Magn Reson Med. 2015 Jul;74(1):231-239. doi: 10.1002/mrm.25385. Epub 2014 Jul 30.

PURPOSE: Intuitively, GRAPPA auto-calibration signal (ACS) lines with higher signal-to-noise ratio (SNR) may be expected to boost the accuracy of kernel estimation and increase the SNR of GRAPPA reconstructed images. Paradoxically, Sodickson and his colleagues pointed out that using...

Showing 1 to 12 of 578 entries