论文标题
对无监督的正规化超声弹性的限制有力启发
Physically Inspired Constraint for Unsupervised Regularized Ultrasound Elastography
论文作者
论文摘要
位移估计是几乎所有超声弹性图（使用）技术的关键步骤。与一般的光流问题相比，这两个主要功能使这项任务与众不同：超声射频（RF）数据的高频性质和位移字段上物理法则的高频性质。最近，已经对光流网络的体系结构进行了修改，以便能够使用RF数据。同样，通过考虑以第一和第二衍生式的正规化形式考虑位移连续性的先验知识，已使用半监督和无监督的技术来使用。尽管尝试了这些尝试，但尚未考虑组织压缩模式，并且假定轴向和横向方向的位移是独立的。但是，组织运动模式受使用的物理定律的控制，使轴向和横向位移高度相关。在本文中，我们提出了对无监督的正则弹性图（图）的身体启发的约束，在此我们对泊松比的限制对改善侧向位移估计值进行了约束。幻影和体内数据的实验表明，图片大大提高了横向位移估计的质量。
Displacement estimation is a critical step of virtually all Ultrasound Elastography (USE) techniques. Two main features make this task unique compared to the general optical flow problem: the high-frequency nature of ultrasound radio-frequency (RF) data and the governing laws of physics on the displacement field. Recently, the architecture of the optical flow networks has been modified to be able to use RF data. Also, semi-supervised and unsupervised techniques have been employed for USE by considering prior knowledge of displacement continuity in the form of the first- and second-derivative regularizers. Despite these attempts, no work has considered the tissue compression pattern, and displacements in axial and lateral directions have been assumed to be independent. However, tissue motion pattern is governed by laws of physics in USE, rendering the axial and the lateral displacements highly correlated. In this paper, we propose Physically Inspired ConsTraint for Unsupervised Regularized Elastography (PICTURE), where we impose constraints on the Poisson's ratio to improve lateral displacement estimates. Experiments on phantom and in vivo data show that PICTURE substantially improves the quality of the lateral displacement estimation.
