10B-6 A Composite Imaging Technique for High Frame-Rate and Full-View Cardiovascular Ultrasound and Elasticity Imaging

Shougang Wang, Wei-Ning Lee, Jianwen Luo, E. Konofagou
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引用次数: 9

Abstract

The frame-rate of ultrasound radio-frequency (RF) data acquisition is critical for imaging of the pulse wave and electromechanical wave propagation in cardiovascular tissues as well as improving the strain estimation. Therefore, an automated method had been developed to overcome the frame-rate limitations on standard systems by retrospective multi-sector signal acquisition through an electrocardiogram (ECG) gating technique. The method achieved a frame rate of 481 Hz at a 100% field of view, 64 line densities and an imaging depth of 11 cm. The composite full-view images were reconstructed by retrospectively combining seven small-sector RF frames using the ECG-gating technique. The axial displacements of both long-axis and short-axis views of a human left ventricle and a long-axis view of the abdominal aorta were calculated using an RF based speckle-tracking technique comprising ID cross-correlation methods in a 2D search (window size of 6.9 mm and overlap of 80%). Several sequences of electromechanical waves propagating in a left ventricular long-axis and short-axis view, and long-axis view of abdominal aorta were imaged at high frame rates. Currently, the method was implemented on an Ultrasonix RP system (Ultrasonix Medical Corp. Richmond, Canada) and could be potentially implemented on other clinical systems.
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10B-6高帧率全视野心血管超声与弹性成像的复合成像技术
超声射频(RF)数据采集的帧率对于脉搏波成像和机电波在心血管组织中的传播以及改善应变估计至关重要。因此,开发了一种自动化的方法,通过心电图(ECG)门控技术,通过回顾性多扇区信号采集来克服标准系统的帧率限制。该方法在100%视场、64线密度和11 cm成像深度下实现了481 Hz的帧率。利用脑电图门控技术将7个小扇形射频帧进行回顾性组合,重建复合全视图图像。使用基于RF的散斑跟踪技术,包括二维搜索中的ID相互关联方法(窗口大小为6.9 mm,重叠度为80%),计算了人左心室长轴和短轴视图以及腹主动脉长轴视图的轴向位移。在高帧率下对左心室长轴、短轴和腹主动脉长轴图像中传播的多个序列的机电波进行成像。目前,该方法已在ultrasix RP系统(ultrasix Medical Corp. Richmond, Canada)上实施,并有可能在其他临床系统上实施。
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