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Postprocessing Techniques for Time-resolved Contrast-enhanced MR Angiography¹

¹ From the Department of Radiology MR Research, Weill Medical College of Cornell University, 515 E 71st St, Suite S120, New York, NY 10021. Received March 14, 2001; revision requested April 27; revision received June 27; accepted July 24. Supported in part by the American Heart Association-Heritage (grant 9951018T) and the National Institutes of Health (grants R01 HL60879, R01 HL62994). Address correspondence to Y.W. (e-mail: yiwang@med.cornell.edu).

The purpose of this study was to improve dynamic two-dimensional projection magnetic resonance digital subtraction angiography by using remasking and filtering postprocessing techniques. Four methods were evaluated in 50 patients: default mask subtraction, remasked subtraction, filtering based on the SD, and linear filtering. The results demonstrated that postprocessing techniques such as linear filtering can reduce background motion artifacts and improve arterial contrast-to-noise ratio.

Index terms: Magnetic resonance (MR), image processing, 9_*.12942², _**.12942³ • Magnetic resonance (MR), vascular studies, 9_*.12942, _**.12942

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