Department of Circulation and Medical Imaging, Norwegian University of Science and Technology (NTNU), Trondheim, Norway.
Ultrasound Med Biol. 2011 Apr;37(4):617-31. doi: 10.1016/j.ultrasmedbio.2010.12.012. Epub 2011 Mar 3.
We present a fast, automatic method for mitral annulus excursion measurement using pocket-sized ultrasound (PSU). The motivation is to provide PSU users with a rapid measurement of cardiac systolic function. The algorithm combines low-frame-rate tolerance, computational efficiency and automation in a novel way. The method uses a speckle-tracking scheme, initialized and constrained by a deformable model. A feasibility study using 30 apical four-chamber PSU recordings from an unselected patient population revealed an error of (mean ± SD) -1.80 ± 1.96 mm, p < 0.001, when compared with manual anatomic m-mode analysis using laptop scanner data. When only septal side excursion was measured, the mean error was -0.27 ± 1.89 mm, p < 0.001. The accuracy is comparable with previously reported results using semiautomatic methods and full-size scanners. The computation time of 3.7 ms/frame on a laptop computer suggests that a real-time implementation on a PSU device is feasible.
我们提出了一种使用袖珍超声（PSU）快速自动测量二尖瓣环位移的方法。其动机是为 PSU 用户提供一种快速测量心脏收缩功能的方法。该算法以新颖的方式结合了低帧率容忍度、计算效率和自动化。该方法使用斑点跟踪方案，由可变形模型初始化和约束。使用来自未选择患者人群的 30 个心尖四腔 PSU 记录的可行性研究表明，与使用笔记本电脑扫描仪数据的手动解剖 M 型分析相比，存在（平均值 ± 标准差）-1.80 ± 1.96 毫米的误差，p < 0.001。当仅测量间隔侧位移时，平均误差为-0.27 ± 1.89 毫米，p < 0.001。其准确性可与使用半自动方法和全尺寸扫描仪报告的先前结果相媲美。在笔记本电脑上的计算时间为 3.7 毫秒/帧，表明在 PSU 设备上实现实时是可行的。
