title: High-resolution MRI of the carotid arteries using a leaky waveguide transmitter and a high-density receive array at 7 T.
abstract: A setup for 7T MRI of the carotid arteries in the neck was designed and constructed. Separate dedicated arrays were used for transmit and receive. For the transmit array, single-side adapted dipole antennas were mounted on a dielectric pillow, which was shown to serve as a leaky waveguide, efficiently distributing B1 into the neck. Risk assessment was performed by simulations. Phantom measurements were performed to establish optimal positions of the antennas on the pillow. Using two antennas, a dual transmit setup was created. In vivo B1 (+) maps with different shim configurations were acquired to assess transmit performance. This effective transmit array was used in combination with a dedicated 30 channel small element receive coil. High-resolution in vivo turbo spin echo images were acquired to demonstrate the excellent performance of the setup.
authors: Department of Radiology, UMC, Utrecht, The Netherlands. w.koning@umcutrecht.nl
authors: W
authors: W
authors: Koning
authors: J J
authors: JJ
authors: Bluemink
authors: E A J
authors: EA
authors: Langenhuizen
authors: A J
authors: AJ
authors: Raaijmakers
authors: A
authors: A
authors: Andreychenko
authors: C A T
authors: CA
authors: van den Berg
authors: P R
authors: PR
authors: Luijten
authors: J J M
authors: JJ
authors: Zwanenburg
authors: D W J
authors: DW
authors: Klomp
mesh_terms: D002339:Carotid Arteries / Q000033:anatomy & histology*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006801:Humans; D007089:Image Enhancement / Q000295:instrumentation*; D018810:Magnetic Resonance Angiography / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014159:Transducers