Mesin Luca, Pasquero Paolo, Albani Stefano, Porta Massimo, Roatta Silvestro
Mathematical Biology and Physiology, Department of Electronics and Telecommunications, Politecnico di Torino, Torino, Italy.
Department of Medical Sciences, University of Torino, Torino, Italy.
Ultrasound Med Biol. 2015 Mar;41(3):845-57. doi: 10.1016/j.ultrasmedbio.2014.09.031. Epub 2015 Jan 28.
Assessment of respirophasic fluctuations in the diameter of the inferior vena cava (IVC) is detrimentally affected by its concomitant displacements. This study was aimed at presenting and validating a method to compensate for IVC movement artifacts while continuously measuring IVC diameter in an automated fashion (with minimal interaction with the user) from a longitudinal B-mode ultrasound clip. Performance was tested on both experimental ultrasound clips collected from four healthy patients and simulations, implementing rigid IVC displacements and pulsation. Compared with traditional M-mode measurements, the new approach systematically reduced errors in caval index assessment (range over maximum diameter value) to an extent depending on individual vessel geometry, IVC movement and choice of the M-line (the line along which the diameter is computed). In experimental recordings, this approach identified both the cardiac and respiratory components of IVC movement and pulsatility and evidenced the spatial dependence of IVC pulsatility. IVC tracking appears to be a promising approach to reduce movement artifacts and to improve the reliability of IVC diameter monitoring.
下腔静脉（IVC）直径的呼吸相波动评估会因其伴随的位移而受到不利影响。本研究旨在提出并验证一种方法，该方法可在从纵向B模式超声片段以自动方式（与用户的交互最少）连续测量IVC直径时补偿IVC运动伪影。对从四名健康患者收集的实验超声片段以及实施刚性IVC位移和搏动的模拟进行了性能测试。与传统的M模式测量相比，新方法系统地将腔静脉指数评估（最大直径值范围内）的误差降低到一定程度，该程度取决于个体血管几何形状、IVC运动和M线（计算直径的线）的选择。在实验记录中，该方法识别出了IVC运动和搏动的心脏和呼吸成分，并证明了IVC搏动的空间依赖性。IVC跟踪似乎是一种很有前景的方法，可减少运动伪影并提高IVC直径监测的可靠性。
