 Since then, many improvements to such systems have been made to enhance resolution and accuracy.Most of them were described in detail in the monograph Advanced in Acoustic Microscopy, Ed.by Andrew Briggs, 1992, Oxford University Press and in monograph by Roman Maev, Acoustic Microscopy Fundamentals and Applications, Monograph, Wiley & Son - VCH, 291 pages, August 2008, as well as recently in .