验证一种基于流体动力学的新计算方法来评估冠心内流量:结合冠心血管学和分数流量储备
Xinzhou Xie1, Na Li2, Tiantong Yu3
1Department of Information Engineering, School of Electronics and Information, Northwestern Polytechnical University, Xi'an, Shaanxi, P.R. China.
概括
计算流体动力学 (CFD) 对冠心内血流的建模准确地识别了通过SPECT MPI诊断的心肌缺血. 这种新的CFD方法为评估冠状动脉生理学提供了一种方便和定量方法.
科学领域:
- 心血管成像 - 心血管成像
- 计算流体动力学的流体动力学.
- 医学诊断 医学诊断 医学诊断
背景情况:
- 冠状动脉扫描的3D模型可以使用计算流体动力学 (CFD) 来计算冠状动脉内血流.
- 分流储备 (FFR) 的测量压力是CFD模型的边界条件.
- 这种技术允许对冠状动脉生理学的非侵入性评估.
研究的目的:
- 评估基于CFD的冠心内血流分析的临床可行性.
- 评估该方法识别心肌缺血的能力.
- 为了比较CFD衍生的流量参数与SPECT心肌输液成像 (MPI) 诊断.
主要方法:
- 纳入了接受SPECT-MPI和冠状动脉血管学FFR的患者.
- 心肌缺血是根据SPECT MPI得分 (SSS,SDS) 确定的.
- 平均流量 (Q) 和总流量阻力 (TFR) 使用新型CFD模型进行计算.
主要成果:
- 这项研究包括52名患者 (53个血管);43.4%的MPI异常.
- 与异常MPI组相比,正常MPI组的平均流速 (Q) 显著更高.
- 在正常的MPI组中,总流电阻 (TFR) 显著降低.
- 对Q (AUC 0.876) 和TFR (AUC 0.854) 的ROC分析显示在区分正常与异常的MPI时具有很高的准确性.
结论:
- 基于CFD的冠状动脉内流量评估在准确识别异常SPECT MPI患者方面显示出希望.
- 这种方法为评估冠状动脉生理学提供了一种方便和定量方法.
- 这些发现支持CFD建模在诊断心肌缺血的临床实用性.
相关概念视频
01:29Blood Flow
Blood is pumped by the heart into the aorta, the largest artery in the body, and then into increasingly smaller arteries, arterioles, and capillaries. The velocity of blood flow decreases with increased cross-sectional blood vessel area. As blood returns to the heart through venules and veins, its velocity increases. The movement of blood is encouraged by smooth muscle in the vessel walls, the movement of skeletal muscle surrounding the vessels, and one-way valves that prevent backflow.
01:27Steady Flow of a Fluid Stream
Consider a control volume, such as a pipe with solid boundaries, through which fluid flows and changes direction due to the impulse exerted by the resulting force from the pipe walls. In steady flow, the mass of fluid entering the control volume at a given time, t, with velocity v1, is equal to the mass leaving after infinitesimal time dt, with velocity v2.
During this process, the momentum of the fluid within the control volume remains constant over the time interval dt. By applying the...
During this process, the momentum of the fluid within the control volume remains constant over the time interval dt. By applying the...
01:16Conservation of Mass in Finite Cotrol Volume
The principle of conservation of mass is a fundamental law in fluid mechanics and is applied using the continuity equation. We apply the concept to a finite control volume to derive the continuity equation.
A system is defined as a collection of unchanging contents, and the conservation of mass states that a system's mass is constant.
A system is defined as a collection of unchanging contents, and the conservation of mass states that a system's mass is constant.
01:09The Buckingham Pi Theorem
The Buckingham Pi theorem provides a structured method to simplify fluid dynamics problems by reducing complex systems of variables to dimensionless terms.
01:27Applications of Integration to Find Blood Flow
Blood flow through a cylindrical blood vessel can be mathematically described using the principles of laminar flow, a regime in which fluid moves smoothly in parallel layers. In this model, the velocity of the blood is not uniform across the cross-section of the vessel; rather, it varies with the radial distance from the center. The maximum velocity occurs along the central axis, decreasing progressively toward the vessel walls, where it reaches zero due to viscous drag.Approximating Blood...