光子学报, 2010, 39 (4): 744, 网络出版: 2010-05-24  

数字式超声内窥成像系统

A Digital Ultrasonic Endoscope System for Medical Imaging
作者单位
天津大学精密仪器与光电子工程学院光电信息技术科学教育部重点实验室, 天津 300072
摘要
介绍了一种采用前置微型电机的新型推拉式超声内窥镜的研制方法.在该内镜系统中,采用FPGA实现成像处理功能,运用编码激励技术以提高系统的信噪比和探测深度,使用了微型前置探头取代了目前商用超声内镜中所采用的钢丝连接以驱动换能器进行旋转扫描.该仪器在300 h的连续工作测试中能够正常运行.相较模拟成像系统,数字系统将模数转换置于信号处理的最前端,从而能够保留回声的更多信息.这使得编码激励、数字式正交解调系统获得更高的成像质量.将电机前置于探头附近,能够较外部导线牵引旋转方式获得更大的旋转稳定性、更高的超声图像质量和更长的使用寿命.
Abstract
The development of a novel push-type ultrasonic endoscope is described in which probe rotation is accomplished by a small motor situated near the transducer. A digital FPGA-based ultrasound imaging system is implemented which uses coded excitation to increase the SNR and penetration depth, with probe rotation accomplished by a small motor situated near the transducer replacing the external motor and the long steel wire used in other ultrasonic endoscopes. The apparatus is tested continuously for 300 hours with no obvious problems. The coded excitation, digital quadrature demodulation imaging system can obtain ultrasonic images of higher quality and more information of the echo is preserved compared with the analog imaging system, because the analog digital conversion is moved to the first step of the signal processing.The digital imaging system possesses a higher SNR resulting in a sharp image. Locating the motor near the probe improves the consistency of rotational speed in comparison with external guide-wire rotation, and increases the image quality and life-span of these devices.

陈晓冬, 李明, 周浩, 温世杰, 郁道银. 数字式超声内窥成像系统[J]. 光子学报, 2010, 39(4): 744. CHEN Xiao-dong, LI Ming, ZHOU Hao, WEN Shi-jie, YU Dao-yin. A Digital Ultrasonic Endoscope System for Medical Imaging[J]. ACTA PHOTONICA SINICA, 2010, 39(4): 744.

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