title: Toward imaging the body at 10.5 tesla.
abstract: To explore the potential of performing body imaging at 10.5 Tesla (T) compared with 7.0T through evaluating the transmit/receive performance of similarly configured dipole antenna arrays.
  
  
  
  Fractionated dipole antenna elements for 10.5T body imaging were designed and evaluated using numerical simulations. Transmit performance of antenna arrays inside the prostate, kidneys and heart were investigated and compared with those at 7.0T using both phase-only radiofrequency (RF) shimming and multi-spoke pulses. Signal-to-noise ratio (SNR) comparisons were also performed. A 10-channel antenna array was constructed to image the abdomen of a swine at 10.5T. Numerical methods were validated with phantom studies at both field strengths.
  
  
  
  Similar power efficiencies were observed inside target organs with phase-only shimming, but RF nonuniformity was significantly higher at 10.5T. Spokes RF pulses allowed similar transmit performance with accompanying local specific absorption rate increases of 25-90% compared with 7.0T. Relative SNR gains inside the target anatomies were calculated to be >two-fold higher at 10.5T, and 2.2-fold SNR gain was measured in a phantom. Gradient echo and fast spin echo imaging demonstrated the feasibility of body imaging at 10.5T with the designed array.
  
  
  
  While comparable power efficiencies can be achieved using dipole antenna arrays with static shimming at 10.5T; increasing RF nonuniformities underscore the need for efficient, robust, and safe parallel transmission methods. Magn Reson Med 77:434-443, 2017. © 2016 International Society for Magnetic Resonance in Medicine.
authors: Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, Minnesota, USA.
authors: M Arcan
authors: MA
authors: Ertürk
authors: Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, Minnesota, USA.
authors: Xiaoping
authors: X
authors: Wu
authors: Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, Minnesota, USA.
authors: Yiğitcan
authors: Y
authors: Eryaman
authors: Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, Minnesota, USA.
authors: Pierre-François
authors: PF
authors: Van de Moortele
authors: Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, Minnesota, USA.
authors: Edward J
authors: EJ
authors: Auerbach
authors: Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, Minnesota, USA.
authors: Russell L
authors: RL
authors: Lagore
authors: Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, Minnesota, USA.
authors: Lance
authors: L
authors: DelaBarre
authors: Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, Minnesota, USA.|Department of Biomedical Engineering in The Mortimer B. Zuckerman Mind Brain Behavior Institute, Columbia University, New York, USA.
authors: J Thomas
authors: JT
authors: Vaughan
authors: Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, Minnesota, USA.
authors: Kâmil
authors: K
authors: Uğurbil
authors: Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, Minnesota, USA.
authors: Gregor
authors: G
authors: Adriany
authors: Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, Minnesota, USA.
authors: Gregory J
authors: GJ
authors: Metzger
mesh_terms: D000328:Adult; D000818:Animals; D003198:Computer Simulation; D004867:Equipment Design; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000295:instrumentation* / Q000379:methods*; D008297:Male; D008953:Models, Anatomic; D019047:Phantoms, Imaging; D013552:Swine; D051598:Whole Body Imaging / Q000379:methods*
keywords: 10.5 Tesla; body imaging; body imaging at ultra-high field; dipole antenna; parallel transmission