Dynamic Nuclear Magnetic Resonance Imaging in the Presence of Field Inhomogeneities
Original Publication Date: 1985-Aug-01
Included in the Prior Art Database: 2005-Feb-19
Magnetic field inhomogeneities cause blurring and distortion of images derived with NMR (nuclear magnetic resonance) techniques. Methods for correcting these distortions require either a priori mappings of these inhomogeneities or much additional scanning for each procedure. These methods are not practical for most medical applications. This article describes a method which, using standard NMR data-collection techniques, measures and corrects for these inhomogeneities. The data collection scheme is the standard method for direct Fourier transform NMR imaging; however, the method herein can be used on data obtained using other standard NMR methods, such as spin-warp. The pulse and gradient scheme is illustrated in the drawing.