【作者】 丁秋芳；

【导师】 李晓阳；

【作者基本信息】 北京工业大学 ， 工程力学， 2006， 硕士

【摘要】 在脉动血流状态下测量主动脉弓的变形与位移一直是医学影像诊断学和血流动力学所关注的研究课题。但是,这方面的研究较少的原因在于测量本身的困难性。不仅是主动脉弓的空间形态影响着测量的操作,更为主要的是主动脉弓的静态曲线边界和动态曲线边界的变化直接影响着主动脉弓的变形测量和位移测量的分析方法研究。随着人们对主动脉弓的血流动力学研究的深入和医学对主动脉弓部位疾病诊断的需求,主动脉弓的变形测量和位移测量越来越突显其重要地位。本文从序列图像处理角度出发,讨论了以CCD图像测量技术为基础的主动脉弓运动和变形的动态图像测量方法。本文在综合参考各种图像处理基本算法的基础上,结合了主动脉弓序列图像的实际特点,针对主动脉边界的不连续和不易识别的特点,对图像采用了基于测量窗口的梯度边缘检测方法。针对解决主动脉弓运动图像检测和跟踪的难点,提出了基于坐标跟踪的动态图像检测方法。通过对主动脉弓直径、中点位移等概念的定义,在主动脉弓的测量方法上,实现了对主动脉弓的运动和变形参量的定量表达,实现了主动脉弓在体动态运动和变形的定量测量和分析。通过在安贞医院进行的兔子和狗实验,并对实验的结果进行分析处理,证明了本文所研究的测量方法在解决主动脉弓运动和变形的问题上是非常有效的,并在技术上和方法上保证了测量的精确性和实时性,可以定量的分析序列图像主动脉弓的运动和变形的规律。更多还原

【Abstract】 Measuring distortion and displacement of aortic arch in station of pulsatile blood flow is all long research subject that is concerned by medical imaging diagnosis and blood flow dynamics, but the research on this subject is very few, the reason consists in the difficulty of measuring. Not only the dimensional configuration of aortic arch influence measurement, but also the movement of static curve border and dynamic curve border of aortic arch directly influence the analysis research on distortion and displacement measurement of aortic arch. Along with people embedding blood flow dynamics research on aortic arch and need of medicine to disease diagnosis on aortic arch, the distortion and displacement measurement is more and more conspicuous and show important status. The paper discusses the movement and distortion dynamic image measurement method based on CCD image measurement technology from the point of view of sequence image process.Combined with actual feature of aortic arch sequence image the paper adopt grads border detecting method based on measuring windows on the base of general reference to all kinds of image processing arithmetic. Aimed at solving detection and track difficulty of aortic arch dynamic image we proposed dynamic image detection method based on coordinate track.In the view of the measurement of the aorta arch, this paper brought out the definition of the diameter of the aorta arch, the midpoint displacement of the aorta arch and the scope of the diameter to realize the ration expression of the motion and deformation of aortic arch. The paper realized the ration measurement and analysis of the motion and deformation of aortic arch.According to the rabbit and dog experiment in Beijing Anzhen Hospital and the analysis of the result, we can get the conclusion: The image measuring technique had a good effect in measuring. Digital image processing technique ensured the accuracy and real-time performance of the measurement. This method can be used to analyze the motion and deformation rule of the aorta in vivo.更多还原