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

NMR in Biomedicine
Bart R SteensmaA J E Raaijmakers

Abstract

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. 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. Simulations 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. 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.

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Citations

Jan 1, 2020·Concepts in Magnetic Resonance. Part B, Magnetic Resonance Engineering·Karthik LakshmananGraham C Wiggins

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Methods Mentioned

BETA
nuclear magnetic resonance

Software Mentioned

Sim4Life
fmincon
Matlab routine

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