激光与光电子学进展, 2019, 56 (14): 141101, 网络出版: 2019-07-12 复制并引用该论文  本文已被引 1 次  被引通知

图 & 表

图 1. Golay编码消除距离旁瓣原理示意图。(a)序列A的自相关函数;(b)序列B的自相关函数;(c)互补序列自相关函数之和

Fig. 1. Principle of Golay coding to eliminate distance side lobes. (a) Autocorrection function of sequence A; (b) autocorrection function of sequence B; (c) sum of complementary sequence autocorrection functions

下载图片 查看原文

图 2. CFCS算法流程图

Fig. 2. Flow chart of CFCS algorithm

下载图片 查看原文

图 3. 编码激励超声成像仿真结果。(a) Barker编码激励成像;(b) Golay互补序列编码激励成像

Fig. 3. Simulation results of coded excitation ultrasound imaging. (a) Barker coded excitation imaging; (b) coded excitation imaging of Golay complementary sequences

下载图片 查看原文

图 4. 两种编码方式的轴向能量展开图(z=25 mm)

Fig. 4. Axial energy expansions of two coding methods (z=25 mm)

下载图片 查看原文

图 5. 不同算法成像仿真结果。(a) SA算法;(b) CFSA算法;(c) CFBarkerSA算法;(d) CFCS算法

Fig. 5. Imaging simulation results of different algorithms. (a) SA algorithm; (b) CFSA algorithm; (c) CFBarkerSA algorithm; (d) CFCS algorithm

下载图片 查看原文

图 6. 4种算法横向能量展开图(z=30 mm)

Fig. 6. Lateral energy expansions of four algorithms (z=30 mm)

下载图片 查看原文

图 7. 4种算法轴向能量展开图(z=25 mm)

Fig. 7. Axial energy expansions of four algorithms (z=25 mm)

下载图片 查看原文

表 1Golay编码和Barker编码对比

Table1. Comparison between Golay coding and Barker coding

Character Golay coding Barker coding Maximum coding length Unlimited 13 Launching times per image 2 1 Pulsecompression Matched-filter Mismatched-filter Algorithm complexity Easy Complicated Side lobes Low High

查看原文

表 2Field II声场仿真模型参数

Table2. Parameters of Field II acoustic field simulation model

Parameter Value Speed of sound wave /(m·s-1) 1540 Number of the elements 32 Center frequency of the sound wave /MHz 5 Sampling frequency /MHz 100 Element width /mm 0.24 Length of the complementary sequences 32 Duration of a single-chip code /μs 1 Number of scattering points 6

查看原文

表 3不同空间位置横向分辨率

Table3. Lateral resolutions at different positions

Position /mm Lateral resolution /mm SA CFSA CFBarkerSA CFCS 25 1.06 0.71 0.71 0.71 30 1.14 0.81 0.81 0.82 35 1.27 0.96 0.96 0.98 40 1.57 1.13 1.13 1.14 50 1.78 1.46 1.46 1.47 55 2.04 1.71 1.72 1.68

查看原文

表 4不同算法生成图像信噪比

Table4. Signal-to-noise ratios of images generated by different algorithms

Algorithm CFSA CFBarkerSA CFCS RSN /dB 20.5 31.7 38.4

查看原文

邓惟心, 陈晓冬, 杨晋, 吉佳瑞, 汪毅, 蔡怀宇. 基于编码激励和相干系数的内镜超声成像算法[J]. 激光与光电子学进展, 2019, 56(14): 141101. Weixin Deng, Xiaodong Chen, Jin Yang, Jiarui Ji, Yi Wang, Huaiyu Cai. Ultrasound Endoscopic Imaging Algorithm Based on Coded Excitation and Coherence Factor[J]. Laser & Optoelectronics Progress, 2019, 56(14): 141101.