Patent ID: 6154030
Filing Date: 2000-11-28
Classification: G01R

Abstract:
Magnetic Resonance Apparatus for re-shaping a signal of selected shape to pre-compensate said signal for expected eddy current distortion thereof of a first sense, comprising(a) selected signal descriptive module for providing a digital representation of said signal of selected shape,(b) a computational module cyclically operative at a first cyclic rate upon said digital representation to compute the opposite sense of said expected eddy current distortion of said selected signal, whereby a corrective signal portion is obtained,(c) a first converter module to transform said corrective signal portion to the analogue representation of the resulting distorted signal, and a second converter module to transform the digital representation of said signal of selected shape to an analogue representation, said second converter module operating substantially concurrently with the operation of said computational module, said first and second converter modules each operative at a selected clocking rate, said first rate being very fast in relation to said selected clocking rate,(d) signal combiner for combining said analogue distortion signal and said signal of selected shape whereby said magnetic resonance apparatus compensates for said expected eddy current distortion.