Abstract: An ultrasonic multi-sector scanner performs overlapping scans such that echoes are generated by many steered beams. A peak reading digital scan converter has a random access memory with a matrix of memory cell locations corresponding to image pixels. An analog or digital comparator compares the incoming echo amplitude with the stored amplitude at an addressed memory location, and writes the incoming data into that location only when the incoming amplitude is larger. The stored largest echo amplitude data is read out in a raster at TV rates for imaging on a cathode ray tube.