Titlebook: Clinical MR Imaging and Physics; A Tutorial Haris S. Chrysikopoulos Book 2009 Springer-Verlag Berlin Heidelberg 2009 MR Angiography.MR Phys

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R?umliche Mobilit?t und Lebenslauf(see Chap. 5). Since M. rotates in the xy plane, it is an oscillating magnetic field, and as such it induces the flow of electric current in a coil. Thus, through a coil or antenna the MR signal is transformed into an electric signal that describes a sinusoidal time course with rapid damping (Fig. 1

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R?umliche Mobilit?t und Lebenslaufere on the T1 ascent. Thus, the final value of the signal is a mixture of spin density and both T1 and T2 relaxation mechanisms. The relative contribution (weight) of the above factors is modified by TR and TE, which determine the high and the low points that we reach on the T1 and T2 curves respect

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DECRY

https://doi.org/10.1007/978-3-662-28279-3is linearly related to TR, one would be tempted to compress TR for time savings. This action (everything else held constant) poses two problems: low overall signal and poor tissue contrast, since we slide leftward on the T1 curve (Fig. 38). The ingenious solution is to disengage tissue saturation an

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agglomerate

,Verarbeitung von Lokalisierungsausdrücken,nment (lattice). The 90° pulses (β) keep the entire bulk magnetization M on the xy plane, i.e., M. = 0. When the β pulse is withdrawn, the magnetization vector M begins its course toward equilibrium with gradual growth along the z-axis toward the value M. (Fig. 9).

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Ben Clark,Kiron Chatterjee,Glenn Lyonsissue variable that can influence the strength of the final MR signal, specifically the proton (or spin) density, i.e., the number of protons per unit of tissue. This number depends on the exact chemical make-up of each tissue and determines the maximum signal that each tissue can produce, represented by the plateau of the T1 curve (Fig. 9).