A Robust Self-navigation for Respiratory Gating in 3D Radial Ultrashort Echo-time Lung MRI using Concurrent Dephasing and Excitation
- 주제(키워드) Self-navigation , Respiratory gating , 3D radial ultrashort echo-time imaging , Lung MRI
- 주제(기타) Physics, Multidisciplinary
- 설명문(일반) [Park, Jinil; Lee, Seokwon; Park, Jang-Yeon] Sungkyunkwan Univ, Dept Biomed Engn, Suwon 16419, South Korea; [Shin, Taehoon] Ewha Womans Univ, Div Mech & Biomed Engn, Seoul 03760, South Korea; [Oh, Se-Hong] Hankuk Univ Foreign Studies, Div Biomed Engn, Yongin 17035, South Korea; [Park, Jang-Yeon] Inst Basic Sci, Ctr Neurosci Imaging Res, Suwon 16419, South Korea
- 관리정보기술 faculty
- 발행기관 KOREAN PHYSICAL SOC
- 발행년도 2018
- URI http://www.dcollection.net/handler/ewha/000000151897
- 본문언어 영어
- Published As http://dx.doi.org/10.3938/jkps.73.138
초록/요약
Three-dimensional ultrashort echo-time (UTE) imaging with radial k-space acquisition is a well-known MR imaging technique that generates comparable lung images to X-ray and computed tomography (CT). Although researchers have sought to minimize the incidence of motion artifacts, there is still a need to accomplish further reduction of motion artifacts through respiratory gating. In this study, we introduce a robust self-navigation for respiratory gating in 3D radial UTE lung imaging especially based on concurrent dephasing and excitation (CODE). To reduce the baseline fluctuation of self-navigated respiratory signals as well as the dependence on the position of the navigating echoes in the k-space trajectories, both of which originate from varying degrees of steadystate condition outside the fully excited regions of a spin system in CODE-MRI, we proposed a new self-navigation method which applies dual navigating echoes successively in the superior-inferior direction and takes the second navigating echoes for respiratory-motion tracking. The phantom and human experimental results showed that the proposed method successfully suppressed the baseline fluctuations of the navigating-echo signals and the resulting respiratory signals, thereby reducing the respiratory-motion artifacts like blurring in the human lung images thanks to the improved respiratory gating.
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