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18 March 2008 Statistical properties of spin noise in MRI
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Spin noise is inherent in magnetic resonance. It is caused by incomplete cancellation of spin moments when the external static magnetic field is absent or by their small but finite fluctuations when the magnetic field is applied. Spin noise is viewed as the variation of thermal equilibrium macroscopic magnetization (TEMM), and can be described statistically. For MRI, TEMM is shown to be characterized by a Binomial distribution and is well approximated by a Gaussian. Parameters of this Gaussian distribution are determined by the spin density and the ratio of population difference over the total population of spins in a unit volume of the sample. Statistics of spin noise not only confirm Bloch's prediction of spin noise in the absence of the external magnetic field, but also give a more accurate account of its behavior under various conditions. These statistics also provide a new insight into the limits of spatial resolution in magnetic resonance microscopy (MRM) and are consistent with Glover and Mansfield' corresponding conclusions based on their experiments.
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Tianhu Lei, Hee Kwon Song, Felix W. Wehrli, and Timothy P. L. Roberts "Statistical properties of spin noise in MRI", Proc. SPIE 6913, Medical Imaging 2008: Physics of Medical Imaging, 69130H (18 March 2008);


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