MRI 1 - IUU~O n a a a Nuclear properties of a few important nuclei in magnetic resonance imaging Nucleus Mag dipole moment p m ~ 2.79 0.85 0.70

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IUU~O naaa Nuclear properties of a few important nuclei in magnetic resonance imaging Gyromagnetic Nucleus Mag. dipole Nuclear spin ratio Larmor freq. 4'~ moment, pm~ 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 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 1.1 x 10" 17.2 abundance in biological tius. 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 Hy 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. In the absence of an
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This note was uploaded on 01/12/2011 for the course BME 325 taught by Professor Sahak during the Fall '10 term at Northwestern.

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MRI 1 - IUU~O n a a a Nuclear properties of a few important nuclei in magnetic resonance imaging Nucleus Mag dipole moment p m ~ 2.79 0.85 0.70

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