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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Resonance,Resonance is the coordinated coupling of energy (stimulus) to matter (system), resulting in the smooth, rhythmic motion of matter according to its inherent oscillation dynamics.

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Electromagnetic Fields,Magnetism and electricity are interrelated phenomena: a moving electrical charge creates a magnetic field. The reverse is also true: a magnetic field that varies in time induces the flow of electric current.

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Macroscopic Magnetization,Each tissue is composed of innumerable magnetization vectors (μ) that are distributed in all possible orientations in space; thus, the net macroscopic magnetization vector (M) is zero (Fig. 3a).

彻底明白

Macroscopic Magnetization Revisited,The discussion in the preceding chapter is an approximation of the true state of affairs. We will now introduce the concept of rotation of the magnetization vectors.

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臭名昭著

Magnetic Substrates of T2 Relaxation,In T2 relaxation there is a loss of phase coherence. Let us examine what conditions promote or resist dephasing.

发誓放弃

,Raumwirksamkeit ökonomischer Determinanten,ation), under the influence of the static field B. However, the magnetization vector M cannot be measured directly; thus, in order to investigate the patient we need to disturb the steady state and to observe the course of M as it returns to equilibrium.

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