Spatial undersampling for synthetic aperture ultrasonic imaging via digital spotlighting technique

High resolution ultrasonic imaging may be achieved via the synthetic apertu re focusing technique, provided that the synthetic antenna should be correc tly spatially sampled, We show that a spatial undersampling is possible, us ing a digital spotlighting technique that permits to recover correct recons tructed images from the aliased data. The proposed method is applied to exp erimental ultrasonic data.