title: Model for b1 imaging in MRI using the rotating RF field.
abstract: Conventionally, magnetic resonance imaging (MRI) is performed by pulsing gradient coils, which invariably leads to strong acoustic noise, patient safety concerns due to induced currents, and costly power/space requirements. This modeling study investigates a new silent, gradient coil-free MR imaging method, in which a radiofrequency (RF) coil and its nonuniform field (B 1 (+)) are mechanically rotated about the patient. The advantage of the rotating B 1 (+) field is that, for the first time, it provides a large number of degrees of freedom to aid a successful B 1 (+) image encoding process. The mathematical modeling was performed using flip angle modulation as part of a finite-difference-based Bloch equation solver. Preliminary results suggest that representative MR images with intensity deviations of <5% from the original image can be obtained using rotating RF field approach. This method may open up new avenues towards anatomical and functional imaging in medicine.
authors: The School of Information Technology and Electrical Engineering, The University of Queensland (UQ), Brisbane, QLD 4072, Australia.
authors: Adnan
authors: 0000-0002-1072-274X
authors: A
authors: Trakic
authors: The School of Information Technology and Electrical Engineering, The University of Queensland (UQ), Brisbane, QLD 4072, Australia.
authors: Jin
authors: 0000-0001-6357-9329
authors: J
authors: Jin
authors: The School of Information Technology and Electrical Engineering, The University of Queensland (UQ), Brisbane, QLD 4072, Australia.
authors: Ewald
authors: E
authors: Weber
authors: The School of Information Technology and Electrical Engineering, The University of Queensland (UQ), Brisbane, QLD 4072, Australia.
authors: Stuart
authors: S
authors: Crozier
mesh_terms: D000465:Algorithms; D019295:Computational Biology / Q000379:methods; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008962:Models, Theoretical; D019047:Phantoms, Imaging; D011846:Radio Waves; D012984:Software