CAJ | 학술논문

为了提高乳房动态核磁共振成像中不同时间点序列图像的配准速度,提出了将快速的Demon非刚性配准算法与图像强度校正相结合的乳房图像配准模型.Demon算法本身基于图像强度变化计算变形参数,因此不适于强度动态增强的图像配准.首先根据乳房组织的信号增强模型应用多项式理论校正待配准图像的强度.再应用Demon算法进行几何变形配准.实验表明该算法在精度上远优于直接使用Demon算法,在与自由形变配准算法具有几乎相同配准精度的前提下,明显提高了配准速度.
위료제고유방동태핵자공진성상중불동시간점서렬도상적배준속도,제출료장쾌속적Demon비강성배준산법여도상강도교정상결합적유방도상배준모형.Demon산법본신기우도상강도변화계산변형삼수,인차불괄우강도동태증강적도상배준.수선근거유방조직적신호증강모형응용다항식이론교정대배준도상적강도.재응용Demon산법진행궤하변형배준.실험표명해산법재정도상원우우직접사용Demon산법,재여자유형변배준산법구유궤호상동배준정도적전제하,명현제고료배준속도.
In order to improve the registration speed of breast dynamic contrast enhancement magnetic resonance images (DCE MRI)which are obtained at different time points,this paper presented a registration model for breast DCE MRI using hst demon non-rigid registration algorithm with intensity correction.original demon is based on intensity change to get deformation parameters and unsuitable for breast DCE MRI.Intensity correction between pre and post contrast images based on polynomial was suggested to overcome the problem according to the signal enhancement of the breast model.The experiment results show that the presented approach perforlTIS better than only demon algorithm and is remarkably faster than free form deformation non-rigid registration algorithm with nearly same precision.