CAJ | 학술논문

在磁共振动态成像和神经成像应用中，由于医学先验信息的时变性，使得传统的约束成像法产生成像误差，且图像配准时间较长。该文提出以快速获取低分辨率图像作为参考图像的约束成像策略，以两帧图像的互信息量结合曲率匹配的图像配准方法。该方法通过对比时序图像相邻帧配准前后的互信息量更新参考图像、检测配准结果。实验结果表明，该方法配准精度高，计算量低，可实时动态成像。
재자공진동태성상화신경성상응용중，유우의학선험신식적시변성，사득전통적약속성상법산생성상오차，차도상배준시간교장。해문제출이쾌속획취저분변솔도상작위삼고도상적약속성상책략，이량정도상적호신식량결합곡솔필배적도상배준방법。해방법통과대비시서도상상린정배준전후적호신식량경신삼고도상、검측배준결과。실험결과표명，해방법배준정도고，계산량저，가실시동태성상。
Due to the time-varying anatomical information in the applications of magnetic resonance dynamic imaging and functional neuroimaging, the traditional constrained imaging suffers the imaging error and the long registration time. In this paper an imaging strategy is proposed to reconstruct rapidly a low-resolution image as the reference image, and make the image registration based on Mutual Information (MI) metric of two images combined with landmark curvature mapping. The proposed method calculates and compares the MI of adjacent frames of temporal image sequences before and after registration to decide whether to update reference images, as well as to verify the registration results. Experimental results show that the proposed method achieves high registration precision and reduces dramatically the computational cost, and thus it can be applied to real-time dynamic imaging.