Ultrasound Endoscopic Imaging Algorithm Based on Coded Excitation and Coherence Factor

Weixin Deng; Xiaodong Chen; Jin Yang; Jiarui Ji; Yi Wang; Huaiyu Cai

doi:10.3788/LOP56.141101

Laser & Optoelectronics Progress, Volume. 56, Issue 14, 141101(2019)

Ultrasound Endoscopic Imaging Algorithm Based on Coded Excitation and Coherence Factor

Weixin Deng, Xiaodong Chen^*, Jin Yang, Jiarui Ji, Yi Wang, and Huaiyu Cai

Key Laboratory of Opto-Electronic Information Technology, Ministry of Education, School of Precision Instruments and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China

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Figures & Tables(11)

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

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Fig. 2. Flow chart of CFCS algorithm

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

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

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

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

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

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Table 1. Comparison between Golay coding and Barker coding
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Table 1. 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

Table 2. Parameters of Field II acoustic field simulation model

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Table 2. 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

Table 3. Lateral resolutions at different positions
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Table 3. 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

Table 4. Signal-to-noise ratios of images generated by different algorithms
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Table 4. Signal-to-noise ratios of images generated by different algorithms
Algorithm CFSA CFBarkerSA CFCS
RSN /dB 20.5 31.7 38.4

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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

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