Download Imaging in Biological Research Part A by P. Michael Conn PDF

By P. Michael Conn

This quantity addresses present equipment in organic imaging, together with wide sections on MRI, CAT, NMR, puppy and different imaging strategies.

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Circulation 91, 2748 (1995). A. , Circulation 100, 141 (1999). 78 J. J. , Circulation 106, 114 (2002). 79 J. , N. Engl. J. Med. 314, 884 (1986). 80 N. , Circulation 91, 1697 (1995). 81 D. , J. Thorac. Cardiovasc. Surg. 115, 791 (1998). 82 P. R. , Circulation 108, 1095 (2003). 83 K. , J. Nucl. Med. 37, 1701 (1996). 84 R. A. , J. Nucl. Med. 41, 1426 (2000). 85–89 Cardiac neurotransmission imaging can be obtained using PET. The most commonly used PET radiopharmaceuticals for imaging presynaptic activity are 18F-fluorodopamine, 11C-hydroxyphedrine, and 11C-ephidrine.

When an ensemble of nuclei is excited with RF, a transverse component of magnetization, orthogonal to the applied field direction, may develop, and it is this component that then rotates and induces the MRI signal in a receiver coil. T2 reflects the time it takes for the ensemble to become disorganized and for the transverse component to decay. Since any growth of magnetization back toward equilibrium must correspond to a loss of transverse magnetization, all contributions to T1 relaxation affect T2 at least as much.

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