| 数字化B超中的频率补偿滤波 |
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| 引用本文： | 仇傲,周山宏,刘春梅. 数字化B超中的频率补偿滤波[J]. 电子科技大学学报(自然科学版), 2007, 36(4): 798-800 |
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| 作者姓名： | 仇傲 周山宏 刘春梅 |
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| 作者单位： | 电子科技大学生命科学与技术学院,成都,610054;西南科技大学信控学院,四川,绵阳,621002 |
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| 摘 要： | 超声在组织中的传播会随着频率和深度的不同产生不同的衰减。该文在建立超声回波信号的数学模型基础上设计了一种补偿频率衰减的滤波器,有效补偿了超声信号在传播过程中由于频率升高、深度增加而变大的吸收衰减。并且将频域运算移植到时域进行,从而避免了大计算量的时频变换。同时融入动态滤波技术,根据不同深度选择了不同的通带范围,有效地保证了信号的信噪比。
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| 关 键 词： | 吸收衰减 动态滤波 频率补偿滤波器 超声信号建模 |
| 收稿时间： | 2005-09-01 |
| 修稿时间： | 2005-09-01 |
Frequency-Dependent Compensation Filter Used in Digital B-scan Ultrasonic Instrument |
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| QIU Ao,ZHOU Shan-hong,LIU Chun-mei. Frequency-Dependent Compensation Filter Used in Digital B-scan Ultrasonic Instrument[J]. Journal of University of Electronic Science and Technology of China, 2007, 36(4): 798-800 |
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| Authors: | QIU Ao ZHOU Shan-hong LIU Chun-mei |
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| Affiliation: | 1.School of Life Science and Technology,University of Electronic Science and Technology of China Chengdu 610054;2.Information and Control Engineering College,Southwest University of Seience and Technology Mianyang Sichuan 621002 |
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| Abstract: | Based on the model of Ultrasonic signals, this paper designs a frequency-dependent compensation filter to solve the problem, which is the ultrasonic signals' absorb attenuation become higher with the far transmission depth and higher frequencies when transmitting in a tissue. We also transform the operation from the frequency to time to avoid big operation. At the same time, we combine the dynamic filter technique which chose different passband with different depth to hold the high signal-to-noise ratio. |
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| Keywords: | absorb attenuation dynamic filter frequency-dependent filter model of ultrasonic signals |
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