title: Motion correction of magnetic resonance imaging data by using adaptive moving least squares method.
abstract: Image artifacts caused by subject motion during the imaging sequence are one of the most common problems in magnetic resonance imaging (MRI) and often degrade the image quality. In this study, we develop a motion correction algorithm for the interleaved-MR acquisition. An advantage of the proposed method is that it does not require either additional equipment or redundant over-sampling. The general framework of this study is similar to that of Rohlfing et al. [1], except for the introduction of the following fundamental modification. The three-dimensional (3-D) scattered data approximation method is used to correct the artifacted data as a post-processing step. In order to obtain a better match to the local structures of the given image, we use the data-adapted moving least squares (MLS) method that can improve the performance of the classical method. Numerical results are provided to demonstrate the advantages of the proposed algorithm.
authors: Institute of Mathematical Sciences, Ewha Womans University, Seoul, 120-750, S. Korea; Yonsei Institute of Convergence Technology, Yonsei University, Inchoen, 406-840, S. Korea. Electronic address: haewonn@yahoo.com.
authors: Haewon
authors: H
authors: Nam
authors: Department of Mathematics, Korea University, Sejong, 339-700, S. Korea.
authors: Yeon Ju
authors: YJ
authors: Lee
authors: Institute of Mathematical Sciences, Ewha Womans University, Seoul, 120-750, S. Korea.
authors: Byeongseon
authors: B
authors: Jeong
authors: Department of Nuclear Medicine, Yonsei University College of Medicine, Seoul, 120-749, S. Korea.
authors: Hae-Jeong
authors: HJ
authors: Park
authors: Department of Mathematics, Ewha Womans University, Seoul, 120-750, S. Korea. Electronic address: yoon@ewha.ac.kr.
authors: Jungho
authors: J
authors: Yoon
mesh_terms: D016477:Artifacts; D019560:Echocardiography, Three-Dimensional; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D016018:Least-Squares Analysis; D008279:Magnetic Resonance Imaging / Q000379:methods*; D009038:Motion
keywords: 3-D image; Edge-directed interpolation; Gradients; Resampling