title: More IMPATIENT: A Gridding-Accelerated Toeplitz-based Strategy for Non-Cartesian High-Resolution 3D MRI on GPUs.
abstract: Several recent methods have been proposed to obtain significant speed-ups in MRI image reconstruction by leveraging the computational power of GPUs. Previously, we implemented a GPU-based image reconstruction technique called the Illinois Massively Parallel Acquisition Toolkit for Image reconstruction with ENhanced Throughput in MRI (IMPATIENT MRI) for reconstructing data collected along arbitrary 3D trajectories. In this paper, we improve IMPATIENT by removing computational bottlenecks by using a gridding approach to accelerate the computation of various data structures needed by the previous routine. Further, we enhance the routine with capabilities for off-resonance correction and multi-sensor parallel imaging reconstruction. Through implementation of optimized gridding into our iterative reconstruction scheme, speed-ups of more than a factor of 200 are provided in the improved GPU implementation compared to the previous accelerated GPU code.
authors.affiliation: Beckman Institute, University of Illinois at Urbana-Champaign, Urbana, IL, USA.
authors.forename: Jiading
authors.initials: J
authors.lastname: Gai
authors.forename: Nady
authors.initials: N
authors.lastname: Obeid
authors.forename: Joseph L
authors.initials: JL
authors.lastname: Holtrop
authors.forename: Xiao-Long
authors.initials: XL
authors.lastname: Wu
authors.forename: Fan
authors.initials: F
authors.lastname: Lam
authors.forename: Maojing
authors.initials: M
authors.lastname: Fu
authors.forename: Justin P
authors.initials: JP
authors.lastname: Haldar
authors.forename: Wen-Mei W
authors.initials: WM
authors.lastname: Hwu
authors.forename: Zhi-Pei
authors.initials: ZP
authors.lastname: Liang
authors.forename: Bradley P
authors.initials: BP
authors.lastname: Sutton
keywords: CUDA; GPU; MRI; Toeplitz; gridding; non-Cartesian