Optical arrays for high frequency ultrasound imaging

Dynamically focused and steered high frequency ultrasound imaging systems require arrays with fine element spacing, wide bandwidths and large apertures. However, these characteristics are difficult to achieve at frequencies greater than 30 MHz using conventional array construction methods. Optical schemes offer a solution. An optical detection system was built with near optimal resolution over a wide depth of field. A possible application is in pathology, where 2-D or 3-D fine resolution imaging can be performed in situ without the need for biopsies.