title: Implementation of GPU-accelerated back projection for EPR imaging.
abstract: Electron paramagnetic resonance (EPR) Imaging (EPRI) is a robust method for measuring in vivo oxygen concentration (pO2). For 3D pulse EPRI, a commonly used reconstruction algorithm is the filtered backprojection (FBP) algorithm, in which the backprojection process is computationally intensive and may be time consuming when implemented on a CPU. A multistage implementation of the backprojection can be used for acceleration, however it is not flexible (requires equal linear angle projection distribution) and may still be time consuming. In this work, single-stage backprojection is implemented on a GPU (Graphics Processing Units) having 1152 cores to accelerate the process. The GPU implementation results in acceleration by over a factor of 200 overall and by over a factor of 3500 if only the computing time is considered. Some important experiences regarding the implementation of GPU-accelerated backprojection for EPRI are summarized. The resulting accelerated image reconstruction is useful for real-time image reconstruction monitoring and other time sensitive applications.
authors.affiliation: School of Computer and Information Technology, Shanxi University, Taiyuan, Shanxi, China.
authors.forename: Zhiwei
authors.initials: Z
authors.lastname: Qiao
authors.affiliation: Department of Radiation Oncology, Rush University Medical Center, Chicago, IL, USA.
authors.forename: Gage
authors.initials: G
authors.lastname: Redler
authors.affiliation: Department of Radiation and Cellular Oncology, The University of Chicago, Chicago, IL, USA.
authors.forename: Boris
authors.initials: B
authors.lastname: Epel
authors.affiliation: School of Computer and Information Technology, Shanxi University, Taiyuan, Shanxi, China.
authors.forename: Yuhua
authors.initials: Y
authors.lastname: Qian
authors.affiliation: Department of Radiation and Cellular Oncology, The University of Chicago, Chicago, IL, USA.
authors.forename: Howard
authors.initials: H
authors.lastname: Halpern
mesh_terms: D000465:Algorithms; D003196:Computer Graphics; D004578:Electron Spin Resonance Spectroscopy / Q000379:methods*; D021621:Imaging, Three-Dimensional / Q000379:methods*; D019047:Phantoms, Imaging
keywords: EPR; EPR imaging; GPU; acceleration; backprojection