CTA图像冠状动脉开口层与开口点的全自动定位方法

首先在基于多条件区域增长和解剖结构的基础上通过圆度的变化确定左冠脉开口层，并在指定范围内确定左冠脉开口点；其次计算升主动脉中心和右冠脉开口范围，利用距离曲线的波峰和波谷，并结合解剖结构的特征来确定右冠脉开口层和开口点.该方法中的各种参数得到了统计学验证.最后对57个对象进行测试，左右冠脉开口层定位准确率分别达到98.2%和96.5%.定位的左右冠脉开口点到金标准点的平均距离分别是(1.22±0.37)mm和(1.76±0.49)mm.实验验证了该方法的有效性.

Fully Automatic Location Method of Ostial Layers and Points of Coronary Arteries for Computed Tomographic Angiographic Images

Firstly， the ostial layer of the left coronary arteries by change of roundness is determined on the basis of multi-condition region growth and the anatomic structure， and the ostial point of the left coronary arteries within the specified range is determined.Secondly， the ascending aorta center and the ostial range of the right coronary arteries are calculated， and the peaks and valleys of the distance curve combined with the features of the anatomic structure are utilized to determine ostial layer and point of the right coronary arteries. The parameters of the proposed method are statistically verified. Finally， 57 subjects are tested. The accuracy of locating the ostial layers of left and right coronary arteries are 98.2% and 96.5%， respectively. The average distances between located ostial points of left and right coronary arteries and the ground truth are (1.22± 0.37)mm and (1.76± 0.49)mm， respectively. The experiments demonstrate the validity of the proposed method.