A Method for Correcting Anisotropic Blurs in Magnetic Resonance Images
All magnetic resonance images are blurred as a result of an inherent decay of spin-echo signals during data acquisition due to spatially-varying and object-dependent transverse relaxation. The extent of the blur depends on the transverse relaxation time (T2) of the object and the data acquisition time used. An iterative method that corrects for such object-dependent anisotropic blurs in hydrogen magnetic resonance images is described. The method involves mathematical generation of the components of the spin-echo signals that gives rise to blurs in the images — using initial estimates of the distribution of spin-density and transverse relaxation time — and subtracting those component from the distorted spin-echo signals. Images reconstructed from such corrected signals yield improved estimates of the T2-weighted spin-density distributions. The method was tested on mathematical phantoms.
KeywordsTransverse Relaxation Time Data Acquisition Time Computer Assist Tomography Data Acquisition Strategy Modulus Image
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