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The cover displays an application of the minimum sum squared error (MSSE) technique to enhance the depth of field of an ultrasound system. Both images were constructed by superimposing CW psfs at multiple ranges. The images are shown on a logarithmic scale and are a function of range and lateral position. Images courtesy of Karthik Ranganathan and William F. Walker, University of Virginia, Biomedical Engineering, Charlottesville, VA. See article K. Ranganathan and W. F. Walker, "A novel beamformer design method for medical ultrasound. Part II: Simulation results," IEEE Trans. Ultrason., Ferroelect., Freq. Contr., vol. 50, no. 1, pp. 25-39, Jan. 2003. Image files available for download: RGB Image (zipped), EPS format, 287 KB (1.72 MB decompressed), RGB Image, JPG format, 77 KB.