1
|
Liu S, Li P, Tan Y, Ding G, Peng B. A robust local pulse wave imaging method based on digital image processing techniques. MATHEMATICAL BIOSCIENCES AND ENGINEERING : MBE 2023; 20:6721-6734. [PMID: 37161125 DOI: 10.3934/mbe.2023289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
The original diameter velocity loop method (ln(D)U-loop) cannot accurately extract the blood vessel diameter waveform when the quality of ultrasound image data is not high (such as obesity, age, and the operation of the ultrasound doctor), so it is unable to measure the pulse wave velocity (PWV) of the ascending aorta. This study proposes a diameter waveform extraction method combining threshold, gradient filtering, and the center of gravity method. At the same time, the linear regression method of searching for the rising point of the systolic period is replaced by the optimal average of two linear regression methods. This method can also extract the diameter waveform with poor-quality images and obtain a more accurate PWV. In vivo experimental data from 17 (age 60.5 ± 9.2) elderly patients with cerebral infarction and 12 (age 32.5 ± 5.6) healthy young adults were used for processing, and the results showed that the mean PWV using the ln(D)U-loop method was 12.56 (SD = 3.47) ms-1 for patients with cerebral infarction and 6.81 (SD = 1.73) ms-1 for healthy young adults. The PWV results based on the Wilcoxon rank-sum test and calculated based on the improved ln(D)U-loop method were both statistically significant (p < 0.01). The agreement analysis (Bland-Altman analysis) between the QA-loop and ln(D)U-loop methods showed that the mean deviation of the measured PWV was 0.07 m/s and the standard deviation of the deviation was 1.18 m/s. The experimental results demonstrated the effectiveness of the improved ln(D)U-loop method proposed in this paper on poor-quality images. This study can improve the possibility of the ln(D)U-loop method being widely used in the clinical measurement of ascending aortic PWV.
Collapse
Affiliation(s)
- Shuyan Liu
- School of Computer Science, Southwest Petroleum University, Chengdu 610500, China
| | - Peilin Li
- School of Computer Science, Southwest Petroleum University, Chengdu 610500, China
| | - Yuanhao Tan
- School of Computer Science, Southwest Petroleum University, Chengdu 610500, China
| | - Geqi Ding
- Ultrasound in Cardiac Electrophysiology and Biomechanics Key Laboratory of Sichuan Province, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu 610072, China
| | - Bo Peng
- School of Computer Science, Southwest Petroleum University, Chengdu 610500, China
- Ultrasound in Cardiac Electrophysiology and Biomechanics Key Laboratory of Sichuan Province, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu 610072, China
| |
Collapse
|
2
|
Xu L, Wang P, Xia P, Wu P, Chen X, Du L, Liu J, Xue N, Fang Z. A Flexible Ultrasound Array for Local Pulse Wave Velocity Monitoring. BIOSENSORS 2022; 12:479. [PMID: 35884282 PMCID: PMC9312981 DOI: 10.3390/bios12070479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Revised: 06/28/2022] [Accepted: 06/28/2022] [Indexed: 06/15/2023]
Abstract
Pulse wave velocity (PWV) measured at a specific artery location is called local PWV, which provides the elastic characteristics of arteries and indicates the degree of arterial stiffness. However, the large and cumbersome ultrasound probes require an appropriate sensor position and pressure maintenance, introducing usability constraints. In this paper, we developed a light (0.5 g) and thin (400 μm) flexible ultrasound array by encapsulating 1-3 composite piezoelectric transducers with a silicone elastomer. It can capture the distension waveforms of four arterial positions with a spacing of 10 mm and calculate the local PWV by multi-point fitting. This is illustrated by in vivo experiments, where the local PWV value of five normal subjects ranged from 3.07 to 4.82 m/s, in agreement with earlier studies. The beat-to-beat coefficient of variation (CV) is 12.0% ± 3.5%, showing high reliability. High reproducibility is shown by the results of two groups of independent measurements of three subjects (the error between the mean values is less than 0.3 m/s). These properties of the developed flexible ultrasound array enable the bandage-like application of local PWV monitoring to skin surfaces.
Collapse
Affiliation(s)
- Lirui Xu
- Aerospace Information Research Institute, Chinese Academy of Sciences (AIRCAS), Beijing 100190, China; (L.X.); (P.W.); (P.X.); (P.W.); (X.C.)
- School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100190, China
| | - Peng Wang
- Aerospace Information Research Institute, Chinese Academy of Sciences (AIRCAS), Beijing 100190, China; (L.X.); (P.W.); (P.X.); (P.W.); (X.C.)
| | - Pan Xia
- Aerospace Information Research Institute, Chinese Academy of Sciences (AIRCAS), Beijing 100190, China; (L.X.); (P.W.); (P.X.); (P.W.); (X.C.)
- School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100190, China
| | - Pang Wu
- Aerospace Information Research Institute, Chinese Academy of Sciences (AIRCAS), Beijing 100190, China; (L.X.); (P.W.); (P.X.); (P.W.); (X.C.)
- School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100190, China
| | - Xianxiang Chen
- Aerospace Information Research Institute, Chinese Academy of Sciences (AIRCAS), Beijing 100190, China; (L.X.); (P.W.); (P.X.); (P.W.); (X.C.)
| | - Lidong Du
- Aerospace Information Research Institute, Chinese Academy of Sciences (AIRCAS), Beijing 100190, China; (L.X.); (P.W.); (P.X.); (P.W.); (X.C.)
- School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100190, China
| | - Jiexin Liu
- Beijing Tiantan Hospital, Capital Medical University, Beijing 100070, China
| | - Ning Xue
- Aerospace Information Research Institute, Chinese Academy of Sciences (AIRCAS), Beijing 100190, China; (L.X.); (P.W.); (P.X.); (P.W.); (X.C.)
- School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100190, China
- Personalized Management of Chronic Respiratory Disease, Chinese Academy of Medical Sciences, Beijing 100190, China
| | - Zhen Fang
- Aerospace Information Research Institute, Chinese Academy of Sciences (AIRCAS), Beijing 100190, China; (L.X.); (P.W.); (P.X.); (P.W.); (X.C.)
- School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100190, China
- Personalized Management of Chronic Respiratory Disease, Chinese Academy of Medical Sciences, Beijing 100190, China
| |
Collapse
|