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基于超声散斑的HIFU监控B超图像配准

ISSN号：1000-7857
期刊名称：科技导报
时间：0
页码：59-63
分类：TP391[自动化与计算机技术—计算机应用技术;自动化与计算机技术—计算机科学与技术] R318[医药卫生—生物医学工程;医药卫生—基础医学]
作者机构：[1]重庆医科大学生物医学工程系、超声医学工程重庆市市级重点实验室,重庆400016
相关基金：国家自然科学基金重点项目（30830040）;国家自然科学基金项目（30970767 30970827）
相关项目：MRI/US引导聚焦超声热凝固进展中温升、空化行为、回声和靶组织声参数间的相关性研究

关键词：高强度聚焦超声, 超声散斑, 图像配准, 相位相关, high intensity focused ultrasound, ultrasonic speckle, image registration, phase correlation

中文摘要：

高强度聚焦超声（HIFU）治疗系统中B超监控图像由于存在伪像和噪声而很难实现图像配准,给靶区定位带来了困难,基于此,提出利用基于超声散斑的相位相关对B超图像进行配准并验证其可行性。首先,根据超声散斑原理和散斑伪随机性,在Matlab7.0软件环境下,利用基于超声散斑的相位相关对从B超图像中提取出散斑图像进行配准,根据得出的位移值配准对应的B超图像;其次,为了与基于超声散斑的图像配准进行对比,对B超图像进行直接相位相关配准;最后,观察配准结果并进行相似度测定。结果显示,基于超声散斑的相位相关算法能够实现对存在伪像和噪声的B超图像的配准,具有较高的精确性和鲁棒性,优于对B超图像直接相位相关算法;同时也验证了基于超声散斑配准B超图像的可行性。

英文摘要：

The existence of phantoms and other ultrasound noises in Ultrasound-Guided HIFU systems＇ B-mode ultrasound images will hamper the B-mode ultrasound image registration and the locating of the target.In order to solve this problem,this paper proposes a new method of B-mode ultrasound image registration based on the phase correlation of ultrasonic speckle.Firstly,under the principles and the pseudorandom feature of the speckle,the speckle images and registration,the B-mode ultrasound images are picked up by using the phase correlation of ultrasonic speckle through the moving values of images,on the platform of Maltab 7.0.Secondly,the direct registration of the phase correlation is compared with the registration of the speckle in B-mode ultrasound images.Thirdly,the results of registration are analyzed and the measurement is made of the similarity degree.It is shown that the phase correlation of the speckle could achieve the image registration among the B-mode ultrasound images with phantoms and noises.This registration method enjoys a high robustness and accuracy,and is better than the direct registration of phase correlation.The feasibility of the registration based on speckle is demonstrated by experiments.

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