超聲傳輸時間法頸動脈脈搏波速估計精度及影響因素研究

鄧麗; 張榆鋒; 楊麗春; 胡曉; 李支堯; 高蓮; 張俊華

doi:10.11999/JEIT160306

超聲傳輸時間法頸動脈脈搏波速估計精度及影響因素研究

doi: 10.11999/JEIT160306

1.
(云南大學信息學院昆明 650091) ②(昆明醫(yī)科大學第三附屬醫(yī)院昆明 650031)

基金項目:

國家自然科學基金(61261007, 61561049)，云南省自然科學基金(2013FA008)

計量
- 文章訪問數(shù): 1477
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- 被引次數(shù): 0
出版歷程
- 收稿日期: 2016-03-31
- 修回日期: 2016-09-09
- 刊出日期: 2017-02-19

Accurate Performance and Associated Influence Factors for Pulse Wave Velocity Measurement of Carotid Arteries Based on Ultrasonic Transit Time Method

1.
(Information School, Yunnan University, Kunming 650091, China)
2.
(The Third Affiliated Hospital of Kunming Medical University, Kunming 650031, China)

Funds:

The National Natural Science Foundation of China (61261007, 61561049 ), The Natural Science Foundation of Yunnan Province (2013FA008)

摘要

摘要: 該文基于傳播模型定量分析了超聲傳輸時間法檢測局部脈搏波速(PWV)過程中掃描幀頻與聲束數(shù)對脈動位移曲線估計、延遲時間估計及PWV擬合的估計精度，采用方差分析確定了誤差顯著性和影響因素的主次關系。結果表明，脈動位移相對誤差在0.23~0.28之間，幀頻對其估計精度影響不顯著( p0.05)；延遲時間估計同時受聲束對距離和幀頻的影響(p0.01 )，聲束對間距從2.38 mm 增大到 38 mm , 平均相對誤差由0.99減至0.06；幀頻從1127 Hz 減小為226 Hz，平均相對誤差由0.19 增至 0.43; PWV擬合受聲束數(shù)及幀頻的共同影響，聲束數(shù)不小于10時，估計誤差為7%~20%，幀頻為主要影響因素(p0.01 )。因此，在保證合理聲束數(shù)條件下，提高幀頻可改善PWV的估計精度。結果有助于為后續(xù)PWV檢測精度的改進研究提供依據。
- 超聲射頻信號 /
- 頸動脈 /
- 脈搏波速 /
- 精度性能
Abstract: The estimation accuracy of the wall displacement, delay time, and linear-regression-based Pulse Wave Velocity (PWV) affected by different scanning frame rates and beam density is investigated quantitatively in the measurement of the regional PWV with ultrasound transit time method based on a model of pulse wave propagation along a carotid artery segment. Through statistical variance analysis, the significance levels of measurement errors as well as the primary and secondary relations of these two influence factors are ascertained. The results show that the frame rates do not significantly affect the wall displacement estimation accuracy (p0.05) with relative errors ranged from 0.23 to 0.28. The delay time measurement accuracy is influenced significantly by the frame rates and spacing between two beams simultaneously (p0.01 ). The relative errors decrease from 0.99 to 0.06 as the distances from the first beam to others increase from 2.38 mm to 38 mm. However, the mean transit time errors increase from 0.19 to 0.43 when the frame rates decrease from 1127 Hz to 226 Hz. The PWV estimation errors ranging from 7% to 20% are affected significantly by the number of beams as well as frame rates under the condition that the beams used for regression fitness are no less than 10. The frame rate is the main influence factor in this situation (p0.01 ). Therefore, the PWV measurement accuracy can be improved by increasing frame rate with a proper beam setting. Experimental results could be helpful to explore novel measurement method for improving PWV accuracy in the follow-up work.
- Ultrasound radio frequency signal /
- Carotid artery /
- Pulse wave velocity /
- Accurate performance

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參考文獻(20)

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