Noise reduction in magnetic resonance imaging

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Abstract
This paper describes a noise-reduction technique applicable to multiple-measurement systems. This method, known as measurement-dependent filtering (or MDF), can be used to advantage in a number of MRI applications. We present the general theory for one of these applications, material-canceled projection imaging. We discuss and show the results of MDF for material-canceled images as well as for heavily T2-weighted spinecho images and computed T2 images. Significant improvements in SNR are demonstrated while spatial resolution is preserved. © 1988 Academic Press, Inc.