Improved elevational and azimuthal motion tracking using sector scans.
Improved elevational and azimuthal motion tracking using sector scans.
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使用扇形扫描改进了高度和方位角运动跟踪。
DOI：
10.1109/tuffc.2013.2616
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Hossack,JohnA
中科院分区：
文献类型：
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作者：
Owen,Kevin;MauldinJr,FWilliam;Nguyen,Sarah;Tiouririne,Mohamed;Hossack,JohnA
超声数据运动跟踪被广泛用于估计组织/换能器的相对运动，例如在徒手三维成像中，连续的二维超声扫描平面被记录在三维体积中。基于散斑跟踪和去相关的方法被用来估计方位和高度平面上的运动。然而，在扇形扫描系统中，由于点扩散函数随横向运动的旋转，斑点跟踪的性能会显著降低。本文提出了一种新的基于三维空间组织运动产生的单个IQ解调扇形扫描A线的复相关的方位-仰角联合运动估计方法。对于扇形扫描系统中的运动估计，我们的方法比斑点跟踪和基于解相关的跟踪都有性能上的优势，特别是当既有垂直运动又有方位运动时。在模拟组织的体模中对已知目标(解剖上精确的3-D打印腰椎模型)进行改进的徒手成像进一步证明了运动跟踪的有效性，表面距离的均方根误差为1.2 mm，而传统方法为2.43 mm。这些数据表明，新算法能够改善扇形扫描系统的跟踪性能，实现有效的徒手三维扫描。
Ultrasound data motion tracking is widely used to estimate relative tissue/transducer motion, for example in freehand 3-D imaging, in which successive 2-D ultrasound scan planes are registered in a 3-D volume. Speckle-tracking and decorrelation-based methods are used to estimate motion in the azimuthal and elevational planes. However, the performance of speckle-tracking is significantly degraded in sectorscan systems because of point-spread function rotation with lateral motion. In this paper, we develop a new method for joint azimuthal-elevational motion estimation based on the complex correlation of individual IQ-demodulated sector-scan A-lines arising from tissue motion in 3-D space. We show that our method has performance benefits over both speckle-tracking and decorrelation-based tracking for motion estimation in sector-scan systems, particularly when there is both elevational and azimuthal motion. Motion-tracking efficacy is further demonstrated by improved freehand imaging of a known target (anatomically accurate 3-D-printed lumbar spine model) in a tissue-mimicking phantom, with an rms surface distance error of 1.2 mm, compared with 2.43 mm for conventional methods. These data indicate that the new algorithm is capable of improved tracking performance for sector scan systems, enabling effective freehand 3-D scanning.