CAJ | 학술논문

从两幅不同角度的造影图像实现血管树的三维骨架重建,传统重建方法常常需要较多的人工干预,才能为每一点找到准确的对应点.文中研究了一种基于Snake模型的重建方法.它在采用多尺度Gabor滤波提取造影血管中轴线的基础上,选取血管树分叉点,优化几何变换矩阵,提高用以初始化Snake的对应点的准确性;然后,针对血管的特性,文中采用GVF(Gradient Vector Flow)流量场作为三维Snake的外部能量场,并给出最小化血管Snake模型能量函数的表达式,使Snake保持自身平滑连续的同时在空间中发生形变以逼近真实轮廓.实验结果表明,该方法与传统的重建方法相比,不但减少了人工干预,而且有效地提高了重建精度.
종량폭불동각도적조영도상실현혈관수적삼유골가중건,전통중건방법상상수요교다적인공간예,재능위매일점조도준학적대응점.문중연구료일충기우Snake모형적중건방법.타재채용다척도Gabor려파제취조영혈관중축선적기출상,선취혈관수분차점,우화궤하변환구진,제고용이초시화Snake적대응점적준학성;연후,침대혈관적특성,문중채용GVF(Gradient Vector Flow)류량장작위삼유Snake적외부능량장,병급출최소화혈관Snake모형능량함수적표체식,사Snake보지자신평활련속적동시재공간중발생형변이핍근진실륜곽.실험결과표명,해방법여전통적중건방법상비,불단감소료인공간예,이차유효지제고료중건정도.
For the 3D reconstruction of blood vessel's skeleton from biplane angiography system,the traditional way requires lots of user interaction to find corresponding points.A method based on Snake model is proposed in this paper.First,multiscale Gabor filter is used to extract the centerlines of blood vessels on the angiography images.Secondly,in order to find corresponding points correctly which are used to initialize Snake,bifurcations on blood vessel's skeleton are chosen to optimize GT(Geometry Translation)matrix.Thirdly,according to the feature of the blood vessels,GVF(Gradient Vector Flow)is utilized as external energy of 3D Snake and the expression of minimizing the external energy is deduced.At last,the Snake iteratively evolve towards the true configuration of the blood vessels,satisfying the constraint of being smooth.The result of experiments indicates;Compared with traditional way,user interaction is reduced and reconstruction performance is improved by this method.