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A New 3-dimensional Ultrasonic Imaging System

We developed a new three-dimensional (3D) ultrasonic imaging system using a two-dimensional (2D) transducer array probe and a digital signal processor (DSP chip). In this system, 3D information is visualized without scanning the ultrasonic beam as follows: i) one element of the 2D transducer phased array transmits the spherical ultrasonic pulse to the 3D measured space, ii) other elements of the 2D array receive echo signals backscattered from objects, and iii) the DSP chip is processing to reconstruct the object image by the delay-and-sum (DS) technique. The experiments, using a catheter-typed 2D array probe (diameter: 3mm), are made on metal parts in a silicon tube. The results show that these reflectors can be detected by this system. The ability is the following: a measured area is 4mm x 4mm x 10mm, a reconstructed pixel size is 0.2mm x 0.2mm x 0.5mm, and a processing time is about lsec.