High resolution imaging of generalized K-distribution parameters using maximum likelihood estimation for ultrasonic diagnosis of muscle after back surgery

An ultrasonic imaging system is presented for diagnostics of post discotomic scarring. The system images parameters derived from a Maximum Likelihood Estimation of generalized K-distribution parameters. This approach is capable to discriminate between Rayleigh-, structural- and Pre-Rayleigh scattering. The system uses multidirectional echo data of the same cross-sectional plane, obtained by a 5 MHz sector scanner that is linearly moved over the human back. This leads to a resolution of the parameter images of approximately 1 mm/spl times/1 mm.