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Read e-book online 34.Medical Imaging PDF

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T. Herman, Image Reconstruction from Projections—The Fundamentals of Computerized Tomography. New York: Academic Press, 1980. 61. G. T. Herman, Image Reconstruction from Projections—Implementation and Applications. New York: Springer-Verlag, 1979. 62. S. Webb, From the Watching of Shadows. New York: Adam Hilger, 1990. GE WANG MICHAEL W. VANNIER University of Iowa COMPUTERIZED TRANSACTION INTERCHANGE. See ELECTRONIC DATA INTERCHANGE. COMPUTER KEYBOARDS. See KEYBOARDS. COMPUTER MEMORY HIERARCHY. See MEMORY ARCHITECTURE.

The motion of the macroscopic nuclear spin magnetization, M is conveniently described in terms of the phenomenological Bloch equation: Mxy dM Mz − M0 = γM × B − − dt T2 T1 (8) where M0 is the equilibrium magnetization, and T1 and T2 are relaxation times. T1 is the characteristic relaxation time for longitudinal magnetization to align with the magnetic field: following a perturbation such as an RF pulse or a change in Normal (randomly arranged) magnetic nuclei Magnetic nuclei polarized by immersion in a magnetic field Figure 5.

Trast and the object contrast as a function of the spatial frequency of the bars. Ideally, the MTF is defined in terms of sinusoidal functions, which are, however, difficult to fabricate. On the other hand, high-contrast resolution through the scanning plane is described in terms of the SSP, which can be computed as the derivative of an edge response in a plane orthogonal to the scanning plane. Several studies have shown that in-plane high-contrast resolution of spiral CT is quite similar to that of incremental CT (8,14).

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