2445分析形式3d径向采样策略用于通过增加交错来保持空间覆盖均匀性.pdfVIP

ytic form 3D radial sampling strategy for maintaing the uniformity of k-space coverage with reasing interleaves 1 2 1 Jinil Park , Tae-Hoon Shin , and Jang-Yeon Park 1Biomedical Engineering, IBS Centerfor Neuroscience Imaging Research, Sungkyunkwan University, Suwon, Gyungki-do, Korea, 2Diagnostic Radiology and Nuclear Medicine, University of Maryland, Baltimore, Maryland, United States Target Audience: MR physicists and radiologists Purpose: In 3D radial-acquisition(RA) imaging, one of the most popular ways fulfilling a nearly uniform k-space coverage is to distribute the coordinates of all projections (or views) along the spiral trajectory running on a sphere from one pole to the other or to the equator, based on a simple ytic expression suggested by Wong et.al (1,2). Although Wong's method provides a nearly uniform k-space coverage with no interleaves or a few interleaves, it fails to maintain the k-space uniformity as the number of interleaves(imax) reases, whi ay cause a decrease of SNR (3) as well as image artifacts such as blurring and streak artifacts. In this study, we propose a modified version of Won ethod that is able to almost maintain the uniformity of k-space coverage even in the event that imax reases, providing an ytic form for the coordinates of all views in terms of the readout gradient strengths in the x-, y -, and z- axes. Our suggestion was validated by simulation and phantom experimen