Synchronization system and digital scanning conversion system of an ultrasonic diagnostic device plays an important role in improving its operation stability, runtime processing velocity and image quality based on the electrical characteristic parameters of a selected probe.
As most of the existing synchronization systems of an ultrasonic diagnostic device have circuits composed of 74/54 series standard TTL ICs, the circuit design is complex and the operation is not stable.
Kye Pong Sang, an institute head at the Faculty of Electronics, has composed a synchronization system and a digital scanning conversion system for ultrasonic diagnostic devices based on the domestic convex array probe widely introduced in our country, and built a device using EPGA.
First, he combined dynamic focus scanning system and cross scanning system in order to improve the directivity of ultrasonic sound and to increase scanning lines for high quality image. Second, he designed a synchronization system for an ultrasonic diagnostic device composed of circular sector scanning systems using the convex array probe by defining the input clock frequency in consideration of the parameters of probe and by counting it with the clock frequency as a reference clock. Third, he precisely calculated the delay time of transmit driver impulse applied to each vibrate chip of convex array probe, and achieved it with inner phase-locking loop (PLL) of Cyclone series FPGA. Then, he designed a digital scanning conversion system in a small image memory mode and realized a high speed coordinate transformation. Finally, he performed two-dimensional plane interpolation for ultrasonic sampling data, and designed a processing circuit.
As a result, he significantly improved the run-time processing speed and the image quality of an ultrasonic diagnostic device, and enhanced the accuracy, stability and reliability of its operation.
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