定量确定超声多普勒频谱图误差的方法

发布时间：2018-07-09 20:54

本文选题：超声多普勒频谱图 + 固有频谱展宽　；参考：《中国超声医学杂志》2016年07期

【摘要】：目的探讨超声多普勒频谱图在测量血流动力学参数误差程度的定量方法。方法采用具有时间对应单一速度值的超声多普勒弦线式体模,对多普勒频谱图产生的固有频率展宽进行试验,以定量确定频谱展宽的程度。先使多普勒弦线式体模的弦线运行为恒速50cm/s,分别用凸阵探头和线阵探头扫描弦线,获得其3种采样深度的多普勒频谱图;然后,使弦线按幅度为100cm/s的正弦波运行,再次获得凸阵探头及线阵探头在3种采样深度下的频谱图谱。将获得的各种状态下的频谱图谱带的上限及下限与设置的弦线速度值进行比较分析。结果所有的超声成像系统的多普勒频谱图均存在固有频谱展宽,凸阵探头的展宽程度与采样深度有关,而线阵探头展宽程度与采样深度无关。结论与以往定性地估计多普勒固有展宽的方法不同,采用具有时间对应单一速度值的超声多普勒弦线式体模能够准确定量地确定频谱图的误差程度。
[Abstract]:Objective to study the quantitative method of measuring the error of hemodynamic parameters by ultrasonic Doppler spectrum. Methods Ultrasonic Doppler chord phantom with time corresponding to a single velocity value was used to test the natural frequency broadening produced by Doppler spectrum to determine quantitatively the degree of spectrum broadening. At first, the strings of the Doppler chord mode are operated at a constant speed of 50 cm / s, and the chords are scanned with convex array probes and linear array probes, respectively, and the Doppler spectra of the three sampling depths are obtained, and then the strings are operated according to the sine wave with the amplitude of 100cm/s. The spectral spectra of convex array probe and linear array probe at three sampling depths are obtained again. The upper and lower limits of the spectrum bands obtained in various states are compared with the values of the set chord velocities. Results the Doppler spectrum of all ultrasonic imaging systems has inherent spectrum broadening. The broadening degree of convex array probe is related to the sampling depth, but the linear array probe broadening degree is not related to the sampling depth. Conclusion different from the previous methods of qualitative estimation of the inherent broadening of Doppler, the ultrasonic Doppler chord phantom with time corresponding to a single velocity value can accurately and quantitatively determine the error degree of the spectrum map.
【作者单位】：深圳市北京大学深圳医院设备科;南方医科大学深圳医院;深圳市隆煜盛科技有限公司;
【分类号】：R445.1

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