Lentle Roger G, Hulls Corrin M
Physiology Department, Institute of Food, Nutrition and Human Health, Massey University, Palmerston North, New Zealand.
Front Physiol. 2018 Apr 9;9:338. doi: 10.3389/fphys.2018.00338. eCollection 2018.
The uses and limitations of the various techniques of video spatiotemporal mapping based on change in diameter (D-type ST maps), change in longitudinal strain rate (L-type ST maps), change in area strain rate (A-type ST maps), and change in luminous intensity of reflected light (I-maps) are described, along with their use in quantifying motility of the wall of hollow structures of smooth muscle such as the gut. Hence ST-methods for determining the size, speed of propagation and frequency of contraction in the wall of gut compartments of differing geometric configurations are discussed. We also discuss the shortcomings and problems that are inherent in the various methods and the use of techniques to avoid or minimize them. This discussion includes, the inability of D-type ST maps to indicate the site of a contraction that does not reduce the diameter of a gut segment, the manipulation of axis [the line of interest (LOI)] of L-maps to determine the true axis of propagation of a contraction, problems with anterior curvature of gut segments and the use of adjunct image analysis techniques that enhance particular features of the maps.
本文描述了基于直径变化（D型时空图）、纵向应变率变化（L型时空图）、面积应变率变化（A型时空图）以及反射光发光强度变化（I图）的各种视频时空映射技术的用途和局限性，以及它们在量化平滑肌中空结构（如肠道）壁的运动性方面的应用。因此，本文讨论了用于确定不同几何构型的肠道隔室壁的大小、传播速度和收缩频率的时空方法。我们还讨论了各种方法固有的缺点和问题，以及避免或最小化这些问题的技术应用。该讨论包括，D型时空图无法指示不减小肠道段直径的收缩部位，L图轴（感兴趣线，LOI）的操作以确定收缩的真实传播轴，肠道段前曲率问题以及增强地图特定特征的辅助图像分析技术的应用。
