Optimization of imaging system for micro-ultrasound

Pao Yue-kong Library Electronic Theses Database

Optimization of imaging system for micro-ultrasound

 

Author: Liu, Peng
Title: Optimization of imaging system for micro-ultrasound
Degree: M.Sc.
Year: 2014
Subject: Ultrasonic imaging.
Imaging systems.
Hong Kong Polytechnic University -- Dissertations
Department: Interdisciplinary Division of Biomedical Engineering
Pages: 53 leaves : illustrations ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2757738
URI: http://theses.lib.polyu.edu.hk/handle/200/7553
Abstract: High-frequency micro-ultrasound, also known as ultrasound bio-microscopy, has the capability to show living tissue structures in detail with resolution on the order of tens of microns. With the help of imaging contrast agent, the sensitivity and resolution could be even higher. Mirco-ultrasound is a powerful imaging tool in biological and preclinical researches. In clinic, it is also used extensively in the diagnosis of cardiovascular, dermatology, ophthalmology and cartilage disease. This study was based on an existing micro-ultrasound imaging system, which was composed of a pulse generator and a signal receiver. After preparing and testing the basic function, a new non-isolated DC power supply was proposed. It was able to convert +12V DC input into ±50V DC output to provide steady power supply for the pulse generator. The maximum output current was up to 150mA, and the maximum output power was 12W. The output voltage could be configured through SPI interface, ranging from ±3V to ±90V to accommodate with different transducers and various application situations. To realize Doppler imaging function, a flexible pulse-wave generation module was designed and implanted in the imaging system. The pulse width and pulse repetition frequency were configurable. Simulation and tests showed that the logic function was correct and the FPGA on-chip resources consumed was acceptable. In addition, data processing flow of Doppler imaging was proposed for system integrity.

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