血同步:用于多模式血动力学信号的同步算法
Nick Eleveld1, Marije Harmsen1, Jan Willem J Elting1
1University of Groningen, University Medical Center Groningen, Department of Neurology, 9713 GZ Groningen, the Netherlands.
Computer methods and programs in biomedicine
|June 27, 2024
概括
一个新的算法准确地检测和纠正动脉血压 (ABP) 和脑血速 (CBv) 信号的时间变化,改进动态脑自调节 (DCA) 的多式分析. 这确保了可靠的血液动力学信号同步.
科学领域:
- 生物医学工程 生物医学工程
- 神经科学是一个神经科学.
- 医疗信号处理 医疗信号处理
背景情况:
- 同步获取动脉血压 (ABP) 和脑血速率 (CBv) 等血液动力学信号对于多式分析至关重要,包括动态脑自身调节 (DCA).
- 技术问题可能会在这些信号之间引入时间转移,使分析复杂化,并可能扭曲结果.
- 准确的信号同步对于可靠地解释生理数据至关重要.
研究的目的:
- 开发和验证一种新的算法,用于检测和纠正多式脉动血动信号中的时间转移.
- 在各种条件下评估算法的性能,包括不同的时移量,噪声水平和波形变化.
- 评估时间变化校正对动态大脑自我调节 (DCA) 指数准确性的影响.
主要方法:
- 开发了一种基于交叉相关的多步算法,用于检测和同步ABP和CBv信号的时间转移.
- 该算法在已知时间转移的数据集上进行了训练和验证,包括渐进式漂移和突然转移.
- 定量验证包括评估人工引入的时间转移 (-4至4秒) 和不同噪音水平的性能.
主要成果:
- 该算法在各种条件下实现了12ms的中位数绝对误差,特别是当应用了峰值交叉相关性值 (>0.9) 时.
- 时间转移估计显示了对叠加白噪声的稳定性.
- 校正后,动态大脑自调节 (DCA) 指数与原始的,非时间转移的信号相比显示出极小的差异,观察到小的相位转移.
结论:
- 开发的算法提供了一种可靠的方法,用于对ABP和CBv信号之间的时间转移进行可视解释的检测和准确的校正.
- 这种工具提高了多模式血液动力学信号分析的质量,特别是在动态大脑自我调节 (DCA) 研究中.
- 精确的信号同步对于推进对脑血管功能的理解至关重要.
相关概念视频
01:19Assessing Blood pressure using a doppler ultrasound
To obtain accurate blood pressure measurements in clinical settings, especially when traditional methods are insufficient, healthcare professionals utilize the Doppler ultrasound technique. This method uses high-frequency sound waves to detect blood flow within the arteries, which is crucial for patients with conditions that complicate circulatory system assessment.
Pre-Procedural Guidelines for Doppler Ultrasound Blood Pressure Assessment:
Preparation of Equipment:
Pre-Procedural Guidelines for Doppler Ultrasound Blood Pressure Assessment:
Preparation of Equipment:
01:25Correlation between ECG and Cardiac Cycle
The electrical signals recorded on an electrocardiogram (ECG) occur before the mechanical processes of contraction and relaxation during the cardiac cycle.
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...
01:18Neural Regulation of Blood Pressure
The neural regulation of blood pressure involves intricate interactions between the autonomic nervous system (ANS) and cardiovascular system, ensuring adequate perfusion of tissues. This regulation primarily occurs through baroreceptor and chemoreceptor reflexes, involving both short-term and long-term mechanisms.
Baroreceptor Reflex
Baroreceptors, located in the carotid sinuses and aortic arch, detect changes in blood pressure. When blood pressure rises, these stretch-sensitive receptors...
Baroreceptor Reflex
Baroreceptors, located in the carotid sinuses and aortic arch, detect changes in blood pressure. When blood pressure rises, these stretch-sensitive receptors...
01:24Pulse Oximetry
Pulse oximetry, or SpO2, is a non-invasive method for continuously monitoring arterial oxygen saturation (SaO2). This procedure involves attaching a probe or sensor to the patient's fingertip, forehead, earlobe, or nose bridge. The sensor works by detecting changes in oxygen saturation levels through light signals generated by the oximeter and reflected by the pulsing blood under the probe.
Purpose
Average SpO2 values are greater than 95%. If the readings fall below 90%, it indicates that...
Purpose
Average SpO2 values are greater than 95%. If the readings fall below 90%, it indicates that...