title: Alternate update of shifted extended keyholes (AUSEK): A new accelerating strategy for interventional MRI.
abstract: Real-time or near-real-time acquisition plays a key role in providing immediate image guidance for interventional magnetic resonance imaging (iMRI). However, the requirement of accurate needle tip localization has made several accelerating techniques, like Keyhole imaging or sliding window reconstruction, difficult to be applied to iMRI. The purpose of this work was to further explore the possible ways of applying view sharing techniques to iMRI. Inspired by Keyhole imaging, we present an easy-to-implement accelerating strategy called "Alternate update of shifted extended keyholes (AUSEK)". In this method, the keyhole views are not only extended but also shifted towards either high-frequency edge to form two divisions in k-space. The divisions which are mirrored to each other along the center are alternately updated following a reference scan. By using simulations and experiments, we demonstrate that AUSEK could effectively preserve the spatial resolution of the image, especially of the needle, at a temporal acceleration rate of about 2.5. AUSEK was implemented online in an open-configuration low-field MR imaging system.
authors.affiliation: Centers for Biomedical Engineering, University of Science and Technology of China, Hefei, Anhui 230027, China.
authors.forename: Shuai
authors.initials: S
authors.lastname: Yu
authors.affiliation: Time Medical Limited, Shatin N.T., Hong Kong 999077, China.
authors.forename: Derek
authors.initials: D
authors.lastname: Kwok
authors.affiliation: Centers for Biomedical Engineering, University of Science and Technology of China, Hefei, Anhui 230027, China.
authors.forename: Yufu
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: Centers for Biomedical Engineering, University of Science and Technology of China, Hefei, Anhui 230027, China.
authors.forename: Qing
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: Centers for Biomedical Engineering, University of Science and Technology of China, Hefei, Anhui 230027, China.
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Huang
authors.affiliation: Time Medical Limited, Shatin N.T., Hong Kong 999077, China.
authors.forename: Geng
authors.initials: G
authors.lastname: Li
authors.affiliation: Centers for Biomedical Engineering, University of Science and Technology of China, Hefei, Anhui 230027, China. Electronic address: bqiu@ustc.edu.cn.
authors.forename: Bensheng
authors.initials: B
authors.lastname: Qiu
mesh_terms: D000818:Animals; D053783:Magnetic Resonance Imaging, Interventional / Q000295:instrumentation* / Q000379:methods*; D019047:Phantoms, Imaging; D013552:Swine; D013848:Thigh / Q000000981:diagnostic imaging
keywords: Accelerated imaging; Interventional MRI; K-space substitution; Keyhole