中文摘要：

Dyna CT和数字减影血管造影（DSA）成像模态对脑动静脉畸形的诊断和治疗具有重要价值。三维Dyna CT可以提供动静脉畸形团的空间信息，而二维DSA可以提供判别动静脉的时间信息。为了同时显示动静脉及畸形团的位置关系，需要对这两种模态的图像进行融合。本文提出一种二维到三维反投影生长的方法，实现了二维DSA图像和三维Dyna CT图像的融合，从而可以在三维Dyna CT图像中直观地区分动静脉。实验结果表明，融合图像既能提供畸形团的空间位置信息，又能提供动静脉流向的时间信息，可以帮助医生更准确地诊断脑动静脉畸形以及进行手术规划。

英文摘要：

Both Dyna CT, a rotational faultage reconstructed technique, and digital subtraction angiography （DSA） play important roles in the diagnosis and treatment of arteriovenous malformations （AVM）. Three-dimensional Dyna CT can provide the spatial information of AVM nidus, while two-dimensional DSA can provide the time information for distinguishing arteries and veins. To illustrate the location relationship of the nidus, arteries and veins at the same time, these two imaging modalities need to be fused. In this paper, a two-dimensional to three-dimensional back projection and growing method is proposed, which realizes the image fusion of two-dimensional DSA and three dimensional Dyna CT and achieves the differentiation of arteries and veins in Dyna CT. The experimental results showed that the fusion image could present both the position information of AVM nidus and the dynamic information of the blood vessels. Therefore, the proposed method can help surgeons locate the AVM abnormality and make oper ation plan more accurately.