北京生物医学工程

眼科高频环阵超声波数字化成像技术的研究

Ophthalmological Hi-Frequency Annular Array Digital Ultrasonic Imaging

作者：王立伟王延群王晓春周盛

单位：中国医学科学院生物医学工程研究所(天津300192)

关键词：环阵;高频;超声;数字化

分类号：

出版年·卷·期（页码）：2011·30·5（447-451）

摘要：

目的设计眼科高频环阵B超平台，实现超声波全程数字化处理。方法设计环阵换能器发射接收电路
，将高频的超声回波信号经过前级放大后直接引出进行高分辨率、高速的模拟数字采样。信号数字化后
，通过高速的现场可编程门阵列（field-programmable gate array，FPGA）完成波束形成、动态聚焦、
滤波、检波及对数放大等一系列信号处理。结果通过临床验证，眼科高频环阵B超平台图像横向分辨率
0.2mm，侧向分辨率0.4mm，满足临床要求。结论环阵超声波数字化成像技术可提高图像分辨率和疾病检
出率。

Objective To design the ophthalmological hi-frequency annular array ultrasonic
platform,and to realize the digital signal processing of ultrasound. Methods We designed
the annular array circuit of transmission and reception. The high frequency ultrasonic echo
signals were proceeded directly to make analog digital sampling with high resolution and
speed after amplification. After the signal digitization,we could accomplish a series of
signal disposals,such as beam formation,dynamic focusing,filtration,demodulation and
logarithm amplification by field-programmable gate array (FPGA). The amplified high
frequency echo signals were proceeded to sample the signals by analog to digital change
device,and deal with the digital signals by FPGA. Results The transverse resolution of the
ophthalmological hi-frequency annular array ultrasonic platform was 0.2mm,the lateral
resolution was 0.4mm,that satisfied the clinical requirement. Conclusions Annular array
digital ultrasonic imaging improved imaging resolution and detective rate of diseases.

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