Partially parallel imaging with phase-sensitive data: Increased temporal resolution for magnetic resonance temperature imaging.
Magnetic resonance temperature imaging can be used to monitor the progress of thermal ablation therapies, increasing treatment efficacy and improving patient safety. High temporal resolution is important when therapies rapidly heat tissue, but many approaches to faster image acquisition compromise image resolution, slice coverage, or phase sensitivity. Partially parallel imaging techniques offer the potential for improved temporal resolution without forcing such concessions. Although these techniques perturb image phase, relative phase changes between dynamically acquired phase-sensitive images, such as those acquired for MR temperature imaging, can be reliably measured through partially parallel imaging techniques using reconstruction filters that remain constant across the series. Partially parallel and non-accelerated phase-difference-sensitive data can be obtained through arrays of surface coils using this method. Average phase differences measured through partially parallel and fully Fourier encoded images are virtually identical, while phase noise increases with g(sqrt)L as in standard partially parallel image acquisitions..
Bankson
James A
JA
Department of Imaging Physics, University of Texas M. D. Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030-4009, USA. jbankson@mdanderson.org
Stafford
R Jason
RJ
Hazle
John D
JD
D000818:Animals; D001932:Brain Neoplasms / Q000628:therapy; D003198:Computer Simulation; D004285:Dogs; D005240:Feasibility Studies; D006358:Hot Temperature; D006979:Hyperthermia, Induced; D007091:Image Processing, Computer-Assisted; D017075:Laser Coagulation; D008279:Magnetic Resonance Imaging / Q000379:methods*; D019047:Phantoms, Imaging; D013696:Temperature