Mooman-Smook J C, Brink P A
Department of Biomedical Sciences, Faculty of Health Sciences, University of Stellenbosch.
Cardiovasc J Afr. 2007 Nov-Dec;18(6):387-92.
In cardiac research, a major goal of prevention of catastrophic events by risk-factor management and earlier detection has, in recent years, led to a proliferation of imaging modalities, moving us from old-fashioned chest X-ray through increasingly sophisticated approaches such as magnetic resonance imaging (MRI) and multi-slice fast computer-aided tomography (CT) scanning. Today, we have the option of using a vast array of invasive and non-invasive approaches, with diverse technical underpinnings, to assess various, and often overlapping aspects of cardiac function. Tissue Doppler imaging (TDI) and the related applications of strain and strain rate imaging are new technologies that are now being evaluated in the realm of practical patient care, and the underlying principles remind us that cardiac contractility is a reflection of the integration of muscle fibre architecture, mechanics and metabolism. TDI is the first technology that allowed imaging of motion within the myocardial wall rather than that of the blood pool, and permits analysis of velocities and accelerations from ultrasonic scatterers in muscle. Since its inception, it has been used to evaluate both new cardiac functional parameters as well as conventional function; for some of these, TDI has proven the superior imaging modality, while for others it offers only incremental information over conventional approaches.
在心脏研究领域，近年来通过危险因素管理和早期检测预防灾难性事件这一主要目标，导致了成像方式的激增，使我们从老式的胸部X光检查，发展到越来越复杂的方法，如磁共振成像（MRI）和多层快速计算机断层扫描（CT）。如今，我们可以选择使用大量具有不同技术基础的侵入性和非侵入性方法，来评估心脏功能的各个方面，而且这些方面往往相互重叠。组织多普勒成像（TDI）以及应变和应变率成像的相关应用是新技术，目前正在实际患者护理领域进行评估，其基本原理提醒我们，心脏收缩力是肌肉纤维结构、力学和代谢整合的反映。TDI是第一种能够对心肌壁内的运动而非血池运动进行成像的技术，并且可以分析肌肉中超声散射体的速度和加速度。自其诞生以来，它一直用于评估新的心脏功能参数以及传统功能；对于其中一些参数，TDI已被证明是更优越的成像方式，而对于其他参数，它相对于传统方法仅提供增量信息。
