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自由式三维超声重建中的探头扇区匹配。

Probe Sector Matching for Freehand 3D Ultrasound Reconstruction.

机构信息

School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing 100044, China.

出版信息

Sensors (Basel). 2020 Jun 2;20(11):3146. doi: 10.3390/s20113146.

DOI:10.3390/s20113146
PMID:32498321
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7308927/
Abstract

A 3D ultrasound image reconstruction technique, named probe sector matching (PSM), is proposed in this paper for a freehand linear array ultrasound probe equipped with multiple sensors, providing the position and attitude of the transducer and the pressure between the transducer and the target surface. The proposed PSM method includes three main steps. First, the imaging target and the working range of the probe are set to be the center and the radius of the imaging field of view, respectively. To reconstruct a 3D volume, the positions of all necessary probe sectors are pre-calculated inversely to form a sector database. Second, 2D cross-section probe sectors with the corresponding optical positioning, attitude and pressure information are collected when the ultrasound probe is moving around the imaging target. Last, an improved 3D Hough transform is used to match the plane of the current probe sector to the existing sector images in the sector database. After all pre-calculated probe sectors are acquired and matched into the 3D space defined by the sector database, a 3D ultrasound reconstruction is completed. The PSM is validated through two experiments: a virtual simulation using a numerical model and a lab experiment using a real physical model. The experimental results show that the PSM effectively reduces the errors caused by changes in the target position due to the uneven surface pressure or the inhomogeneity of the transmission media. We conclude that the PSM proposed in this study may help to design a lightweight, inexpensive and flexible ultrasound device with accurate 3D imaging capacity.

摘要

本文提出了一种名为探头扇区匹配（PSM）的三维超声图像重建技术，适用于配备多个传感器的自由线性阵列超声探头，提供换能器的位置和姿态以及换能器与目标表面之间的压力。所提出的 PSM 方法包括三个主要步骤。首先，将成像目标和探头的工作范围分别设置为成像视场的中心和半径。为了重建三维体积，需要预先计算所有必要的探头扇区的位置，以形成扇区数据库。其次，当超声探头在成像目标周围移动时，采集具有相应光学定位、姿态和压力信息的 2D 截面探头扇区。最后，使用改进的 3D Hough 变换将当前探头扇区的平面与扇区数据库中现有的扇区图像进行匹配。在获取并将所有预先计算的探头扇区匹配到扇区数据库定义的三维空间后，完成三维超声重建。通过数值模型的虚拟仿真和真实物理模型的实验室实验对 PSM 进行了验证。实验结果表明，PSM 有效地减少了由于目标位置因表面压力不均匀或传输介质不均匀而发生变化所引起的误差。我们得出结论，本文提出的 PSM 可能有助于设计具有精确三维成像能力的轻便、廉价和灵活的超声设备。

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本文引用的文献

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