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《Frontiers of Information Technology & Electronic Engineering》 2015年04期
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An efficient quadrature demodulator for medical ultrasound imaging

Hao ZHOU  Yin-fei ZHENG  
【摘要】:Quadrature demodulation is used in medical ultrasound imaging to derive the envelope and instantaneous phase of the received radio-frequency(RF) signal.In quadrature demodulation,RF signal is multiplied with the sine and cosine wave reference signal and then low-pass filtered to produce the base-band complex signal,which has high computational complexity.In this paper,we propose an efficient quadrature demodulation method for B-mode and color flow imaging,in which the RF signal is demodulated by a pair of finite impulse response filters without mixing with the reference signal,to reduce the computational complexity.The proposed method was evaluated with simulation and in vivo experiments.From the simulation results,the proposed quadrature demodulation method produced similar normalized residual sum of squares(NRSS) and velocity profile compared with the conventional quadrature demodulation method.In the in vivo color flow imaging experiments,the time of the demodulation process was 5.66 ms and 3.36 ms,for the conventional method and the proposed method,respectively.These results indicated that the proposed method can maintain the performance of quadrature demodulation while reducing computational complexity.

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中国期刊全文数据库 前1条
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【共引文献】
中国期刊全文数据库 前1条
1 方思敏;周盛;王晓春;叶青盛;田玲;计建军;王延群;;基于FPGA的数字化眼科超声成像中信号处理算法的研究与实现[J];中国医疗器械杂志;2015年01期
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