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MRI - 1 - IUU~O n a a a Nuclear properties of a few...

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IUU~O n a a a Nuclear properties of a few important nuclei in magnetic resonance imaging Gyromagnetic Nucleus Mag. dipole Nuclear spin ratio Larmor freq. 4 ' ~ moment, p m ~ number, I (radiandtesla) (MHzItcsla) ' H 2.79 112 2.7 X 10' 42.6 2H 0.85 1 4.1 x lo7 6.5 I'C 0.70 112 6.7 x lo7 10.7 I4N 0.40 1 1.9 x lo7 3.1 2.21 312 7.1 x lo7 11.7 'I P 1.13 112 1.1 x 10" 17.2 abundance in biological t i u s . Currently all clinical images are obtained ushg the proton signal. As with angular momentum the nuclear magnetic moment is quantized and can exist only in discrete H y levels described by k = ymr(hl2w) (4-4) Figun 172 Energy diagram for spin = 112 nucleus. In the absence of an external magnetic field (6 = 0) the energy levds of the nuclear spin states are identical and the states are degenerate. The application of a magnetic field produces a difference in energy of the two spin states through Zeeman splitting. For the proton, with a spin = 112, two energy levels are allowed for the nuclear magnetic moment. This is graptucally illustrated in Fig. 172.
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