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Cross-calibration matrix based autofocusing algorithm. In this method, the residual error on the k-space data was assumed to originate from the inaccuracies in the scanner-camera cross-calibration matrix. Thus, the residual motion between each k-space line was a function of the difference between the used and corrected cross-calibration matrices. So, in this method, the cross-calibration matrix was optimized to find the image with minimum entropy.
