Nuclear magnetic resonance imaging

Partain, C. Leon; Price, Ronald R.; Patton, James A.; Stephens, W. H.; Price, Angie; Runge, Val M.; Mitchell, Mark R.; Stewart, Robert G.; Sandler, Martin P.; James, A. Everette

doi:10.1148/radiographics.4.1.5

Cited by 12 publications

(6 citation statements)

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“…In addition important fields such as flow imaging and microimaging are not covered. Fortunately, several excellent monographs .are available that provide more detailed and more extensive information (Mansfield & Morris, 1982;Jaklovsky, 1983;Kaufman et al 1981;Wende & Thelen, 1983;Roth, 1984;Petersen et al 1985;Morris, 1986;Partain et al 1987).…”

Section: Discussionmentioning

confidence: 99%

Methodology of magnetic resonance imaging

Ernst¹

1987

Quart. Rev. Biophys.

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Section: Discussionmentioning

confidence: 99%

Methodology of magnetic resonance imaging

Ernst¹

1987

Quart. Rev. Biophys.

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“…Esta carga positiva del protón en movimiento produce una corriente eléctrica que, por estar en constante movimiento, genera una fuerza magnética, es decir, un campo magnético. Por ello, el protón tiene su propio campo magnético y puede considerarse como un pequeño imán [1,4].…”

Section: Bases Físicas De La Resonancia Magnéticaunclassified

“…Sin embargo, la diferencia en el número de protones alineados paralelamente, en comparación con los que lo hacen forma antiparalela, es muy poca. Se hace un cálculo aproxi-mado de 10.000.007/10.000.000 [1,2,4,5].…”

Section: Bases Físicas De La Resonancia Magnéticaunclassified

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Resonancia magnética cerebral: secuencias básicas e interpretación

2011

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La resonancia magnética cerebral se ha establecido como una herramienta muy valiosa para el diagnóstico de enfermedades neurológicas, debido a su capacidad de proveer excelente detalle y caracterización de los tejidos.En este artículo se explican las bases físicas de la resonancia magnética y las diferentes secuencias usadas en el protocolo de imágenes cerebrales, con el objetivo de proporcionar al lector las herramientas básicas para comprender las imágenes del cerebro.

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“…The line intensity can be adjusted to simulate different T 2 s. The range of T2 values studied includes those typically found in clinical MR imaging: T 2 ϭ 30, 62 and 126 ms, roughly equivalent to those referred in the literature for muscle, fat, and tumor, respectively [17,18]. Longer T 2 values are much less affected by blurring and have not been considered in the experiment.…”

Section: Synthetic Images and Computer Simulationmentioning

confidence: 99%

Resolution recovery in Turbo Spin Echo using segmented Half Fourier acquisition

Santa-Marta

Lafuente

Vaquero

et al. 2004

Magnetic Resonance Imaging

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Turbo Spin Echo (TSE) is a sequence of choice for obtaining T 2 -weighted images. TSE reduces acquisition time by acquiring several echoes within each TR, at the cost of introducing an exponential weighting in the k-space that leads to a certain image blurring. This is particularly important for short-T 2 structures, which can even disappear if their size in the phase encoding direction is comparable to the degree of blurring. This article suggests the use of a combination of Half Fourier (HF) and segmented (multishot) TSE (sHF-TSE) to recover the original resolution of the SE images. The improved symmetry of the dataset achieved by HF reconstruction is used to increase the resolution of the TSE images. The proposed combination, available in most clinical scanners, reduces the blurring artifact inherent to the TSE sequence without increasing the scan time or the number of acquisitions, but at the cost of a slight reduction of the signal-to-noise ratios (SNR). Qualitative and quantitative results are presented using both numerical simulation and imaging. Significan edge enhancement has been achieved for structures with short T 2 , (narrowing of the full width at half maximum [FWHM] up to 45%). The proposed sequence is more sensitive to movement artifacts but has proven to be superior to the conventional TSE for imaging static structures.

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Nuclear magnetic resonance imaging

Abstract: This exhibit describes the physical basis ofNMR imaging, defines the basic NMR parameters p , Ti and T2, presents in vivo images of human subjects and describes current areas of investigation.

Cited by 12 publications

References 0 publications

Methodology of magnetic resonance imaging

Methodology of magnetic resonance imaging

Resonancia magnética cerebral: secuencias básicas e interpretación

Resolution recovery in Turbo Spin Echo using segmented Half Fourier acquisition

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