基于内窥超声环阵换能器的快速成像方法研究

Ultrafast Imaging Method with Endoscopic Ultrasonic Circular Array

随着超声快速成像技术的发展,诞生了一系列新型超声成像模态,大大提高了病变诊断的准确性和特异性。但这些新技术都需要较高的成像帧率来实现对组织瞬时变化的精确追踪。然而目前已有的几种快速成像算法都是基于线阵、凸阵以及平面阵的,还没有完全应用到内窥环阵换能器上,导致这些新技术还无法很好地应用到内窥成像中。为此,该文研究了3种基于内窥超声环阵换能器的快速成像方法,并进行了图像重建的理论推导以及仿真实验验证。结果表明,3种快速成像算法都可以将成像帧率提高到1 kHz以上,同时将横向分辨率限制在2 mm以内。

Rapid development of ultrafast ultrasound imaging method has led to novel ultrasound imaging modalities.These novel imaging modalities significantly improve the accuracy and specificity on disease diagnosis and they all need high imaging fame rate to enable accurate tracking of transient tissue variation.However,current ultrafast imaging methods are all based on linear array,convex array or planar array,they haven’t been fully used on endoscopic ultrasonic(EUS)circular array.Therefore,it is still difficult to implant these methods on EUS.To solve this problem,three kinds of ultrafast imaging methods with EUS circular array were studied.The theoretical analysis on image reconstruction and simulation experiments were implemented.The results show that all the methods can improve the imaging frame to nearly 1 kHz with lateral resolution not wider than 2 mm.