Ultrasound Distortion Compensation Using a "Blind System Identification" Method

Brief Description


This technology provides an increase in the resolution of ultrasound imaging by a new method of compensating for waveform aberration caused by muscle, fat and other tissue inhomogeneities.



Medical use of ultrasound for diagnostic imaging of the heart, abdomen and fetus is now limited by wave front distortion, caused by inhomogeneity within tissue, that degrades geometric focusing to yield images less than satisfactory for accurate diagnosis.  Earlier attempts, using a single-phase screen method, compensate for time-shift distortion alone.  This new method includes not only arrival time shifts, but also amplitude variations and waveform shape changes.

In this invention, the method of blind system identification (BSI), which was developed to address distortion in wireless telephone communications, is applied to ultrasonic imaging.  BSI is used first to estimate the effective filtering done by the tissue inhomogeneities and then to create corresponding filters to compensate for the aberration on both transmission and reception.  An improvement to this technique is found in UR 2-11144-04041.

Patent Information:
Title Country Patent No. Issued Date
Ultrasound Distortion Compensation Using a Blind System Identification United States 6,699,189 3/2/2004
For Information, Contact:
John FahnerVihtelic
Senior Licensing Manager
University of Rochester
Robert Waag
Feng Lin