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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：使用3D扫掠量超声探头，物体速度和方向对3D斑点跟踪性能的影响。

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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超声进行三维（3D）软组织跟踪对于监测治疗过程中的器官运动非常重要。以前，我们演示了使用3D扫描体积超声探头在体内进行呼吸诱导的肝脏运动的特征跟踪。这项研究的目的是研究在没有任何结构信息的情况下物体的速度如何影响超声斑点跟踪的准确性，该信息模仿了同质组织在方位角和仰角方向运动的情况。对于对象运动向换能器的扫掠方向的前进和后退，空间采样频率分别随对象速度的增加或减少。我们检查了换能器对跟踪精度的影响对象运动方向。我们成像了同质的超声散斑幻影，同时以0-35 mm s（1）的速度线性移动探针。对于2mm和4mm的固定位移，跟踪精度和精度是速度，深度和运动方向的函数。对于方位角方向，位移分别为2和4 mm时，精度分别优于0.1和0.15 mm。对于高度方向2 mm的位移，大多数速度下的精度均优于0.5 mm。对于具有逆行运动的4 mm高程位移，在大于14 mm s的速度下观察到精度和精度随速度降低和跟踪失败（1）。跟踪失败归因于斑点去相关，这是由于空间采样频率随逆行运动速度的增加而降低的结果。对于前进运动，未观察到跟踪失败。对于体积间的位移大于2 mm的情况，仅应跟踪前进运动，这将使时间分辨率降低2倍。对于在高度方向上前进运动的跟踪误差为0.5 mm左右，表明使用扫掠探头技术散斑当前，跟踪精度太差，无法在一系列体积图像上跟踪同质组织，因为这些误差会累积。可以通过增加高度方向上的空间采样来进行改进。

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