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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超声波的三维（3D）软组织跟踪对于治疗过程中的器官运动感兴趣。以前我们使用3D扫描体积超声探头证明了体内呼吸诱导的肝运动的特征跟踪。本研究的目的是研究对象速度如何在没有任何结构信息的情况下如何影响跟踪超声波斑点的准确性，这使得均匀组织的情况模仿在方位角和高度方向上的运动。对于对象运动梯度和逆行到换能器的扫描方向，空间采样频率分别随对象速度增加或减少。我们在跟踪精度上检查了换能器的效果对象运动方向。我们成像均匀的超声波斑点幻像，同时以0-35mm S（1）的速度以线性运动移动探头。调查跟踪精度和精度作为速度，深度和运动方向的函数，用于固定位移2和4毫米。对于方位角方向，分别为2和4mm的位移的精度优于0.1和0.15mm。对于高度方向的2 mm位移，对于大多数速度，精度优于0.5毫米。对于具有逆行运动的4毫米的高度位移，在大于14mm S（1）的速度下观察到速度和跟踪故障减小的精度和精度。由于逆行运动速度增加，跟踪失败由于降低空间采样频率而归因于散斑去相关性。对于移植运动，未观察到跟踪失败。对于容积的位移大于2毫米，只能跟踪普雷基运动，这将减小时间分辨率的数量。在正视方向上的普遍探测技术的普遍探测技术的旋转运动的序列的跟踪误差表示使用扫描探头技术斑点跟踪精度目前太差，无法在一系列卷图像上跟踪均匀组织，因为这些错误将累积。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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