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首页> 外文期刊>Physics in medicine and biology. >The effect of object speed and direction on the performance of 3D speckle tracking using a 3D swept-volume ultrasound probe.
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The effect of object speed and direction on the performance of 3D speckle tracking using a 3D swept-volume ultrasound probe.

机译：物体速度和方向对3D扫描跟踪性能的影响使用3D扫描超声探头。

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摘要

Three-dimensional (3D) soft tissue tracking using 3D ultrasound is of interest for monitoring organ motion during therapy. Previously we demonstrated feature tracking of respiration-induced liver motion in vivo using a 3D swept-volume ultrasound probe. The aim of this study was to investigate how object speed affects the accuracy of tracking ultrasonic speckle in the absence of any structural information, which mimics the situation in homogenous tissue for motion in the azimuthal and elevational directions. For object motion prograde and retrograde to the sweep direction of the transducer, the spatial sampling frequency increases or decreases with object speed, respectively. We examined the effect object motion direction of the transducer on tracking accuracy. We imaged a homogenous ultrasound speckle phantom whilst moving the probe with linear motion at a speed of 0-35 mm s(1). Tracking accuracy and precision were investigated as a function of speed, depth and direction of motion for fixed displacements of 2 and 4 mm. For the azimuthal direction, accuracy was better than 0.1 and 0.15 mm for displacements of 2 and 4 mm, respectively. For a 2 mm displacement in the elevational direction, accuracy was better than 0.5 mm for most speeds. For 4 mm elevational displacement with retrograde motion, accuracy and precision reduced with speed and tracking failure was observed at speeds of greater than 14 mm s(1). Tracking failure was attributed to speckle de-correlation as a result of decreasing spatial sampling frequency with increasing speed of retrograde motion. For prograde motion, tracking failure was not observed. For inter-volume displacements greater than 2 mm, only prograde motion should be tracked which will decrease temporal resolution by a factor of 2. Tracking errors of the order of 0.5 mm for prograde motion in the elevational direction indicates that using the swept probe technology speckle tracking accuracy is currently too poor to track homogenous tissue over a series of volume images as these errors will accumulate. Improvements could be made through increased spatial sampling in the elevational direction.
机译：使用3D超声三维（3D）的软组织跟踪是用于治疗期间监测器官运动的兴趣。先前我们证明呼吸诱导的肝运动的特征跟踪体内使用3D掠体积超声探头。本研究的目的是调查对象速度如何影响在不存在任何的结构信息，其模仿在用于在方位角和仰角方向上的运动的均匀组织的情况跟踪超声斑点的准确度。对于物体运动顺行和逆行到换能器的扫描方向，空间采样频率的增加或与物体的速度，分别降低。我们检查了跟踪精度换能器的作用物体的运动方向。我们成像均匀的超声体模散斑同时以0-35毫米S（1）的速度移动与直线运动的探针。跟踪精度和精密度研究作为速度，深度和运动方向的为2和4mm的固定的位移的函数。对于方位角方向，精度好于0.1和0.15毫米的分别为2和4mm位移。在正视方向2mm的位移，准确度为对于大多数速度优于0.5毫米。对于逆行运动，准确度和精度4毫米正视位移减小的速度和以更大的速度比14毫米S（1）中观察到的跟踪失败。跟踪失败归因于散斑去相关作为减少与增加逆行运动的速度的空间采样频率的结果。对于顺行运动，跟踪失败，没有观察到。对于卷间的位移大于2mm，只有顺行运动应跟踪将由2.为0.5mm在正视方向顺行运动的顺序的跟踪误差的因素降低时间分辨率表示使用扫过探针技术散斑跟踪精度是目前太可怜了一系列的立体图像，因为这些错误会积累的跟踪同质组织。改进可以通过空间采样增加在垂直方向进行。

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