• NMR in biomedicine · Sep 2018

    Design of a forward view antenna for prostate imaging at 7 T.

    • Bart R Steensma, Ingmar Voogt, Abe J van der Werf, van den BergCornelis A TCATUniversity Medical Center Utrecht, Utrecht, the Netherlands., Peter R Luijten, KlompDennis W JDWJUniversity Medical Center Utrecht, Utrecht, the Netherlands., and RaaijmakersAlexander J EAJEUniversity Medical Center Utrecht, Utrecht, the Netherlands..
    • University Medical Center Utrecht, Utrecht, the Netherlands.
    • NMR Biomed. 2018 Sep 1; 31 (9): e3993.

    PurposeTo design a forward view antenna for prostate imaging at 7 T, which is placed between the legs of the subject in addition to a dipole array.Materials And MethodsThe forward view antenna is realized by placing a cross-dipole antenna at the end of a small rectangular waveguide. Quadrature drive of the cross-dipole can excite a circularly polarized wave propagating along the axial direction to and from the prostate region. Functioning of the forward view antenna is validated by comparing measurements and simulations. Antenna performance is evaluated by numerical simulations and measurements at 7 T.ResultsSimulations of B1+ on a phantom are in good correspondence with measurements. Simulations on a human model indicate that the signal-to-noise ratio (SNR), specific absorption rate (SAR) efficiency and SAR increase when adding the forward view antenna to a previously published dipole array. The SNR increases by up to 18% when adding the forward view antenna as a receive antenna to an eight-channel dipole array in vivo.ConclusionsA design for a forward view antenna is presented and evaluated. SNR improvements up to 18% are demonstrated when adding the forward view antenna to a dipole array.© 2018 The Authors. NMR in Biomedicine published by John Wiley & Sons Ltd.

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