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

Autor: Steensma BR; University Medical Center Utrecht, Utrecht, the Netherlands., Voogt I; University Medical Center Utrecht, Utrecht, the Netherlands., van der Werf AJ; University Medical Center Utrecht, Utrecht, the Netherlands., van den Berg CAT; University Medical Center Utrecht, Utrecht, the Netherlands., Luijten PR; University Medical Center Utrecht, Utrecht, the Netherlands., Klomp DWJ; University Medical Center Utrecht, Utrecht, the Netherlands., Raaijmakers AJE; University Medical Center Utrecht, Utrecht, the Netherlands.
Jazyk: angličtina
Zdroj: NMR in biomedicine [NMR Biomed] 2018 Sep; Vol. 31 (9), pp. e3993. Date of Electronic Publication: 2018 Jul 18.
DOI: 10.1002/nbm.3993
Abstrakt: Purpose: To 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 Methods: The 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.
Results: Simulations of B 1 + 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.
Conclusions: A 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.)
Databáze: MEDLINE
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