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

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...

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Autores principales: Steensma, Bart R., Voogt, Ingmar, van der Werf, Abe J., van den Berg, Cornelis A.T., Luijten, Peter R., Klomp, Dennis W.J., Raaijmakers, Alexander J.E.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6175442/
https://www.ncbi.nlm.nih.gov/pubmed/30022543
http://dx.doi.org/10.1002/nbm.3993
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author Steensma, Bart R.
Voogt, Ingmar
van der Werf, Abe J.
van den Berg, Cornelis A.T.
Luijten, Peter R.
Klomp, Dennis W.J.
Raaijmakers, Alexander J.E.
author_facet Steensma, Bart R.
Voogt, Ingmar
van der Werf, Abe J.
van den Berg, Cornelis A.T.
Luijten, Peter R.
Klomp, Dennis W.J.
Raaijmakers, Alexander J.E.
author_sort Steensma, Bart R.
collection PubMed
description 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.
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spelling pubmed-61754422018-10-19 Design of a forward view antenna for prostate imaging at 7 T Steensma, Bart R. Voogt, Ingmar van der Werf, Abe J. van den Berg, Cornelis A.T. Luijten, Peter R. Klomp, Dennis W.J. Raaijmakers, Alexander J.E. NMR Biomed Research Articles 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. John Wiley and Sons Inc. 2018-07-18 2018-09 /pmc/articles/PMC6175442/ /pubmed/30022543 http://dx.doi.org/10.1002/nbm.3993 Text en © 2018 The Authors. NMR in Biomedicine published by John Wiley & Sons Ltd. This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Articles
Steensma, Bart R.
Voogt, Ingmar
van der Werf, Abe J.
van den Berg, Cornelis A.T.
Luijten, Peter R.
Klomp, Dennis W.J.
Raaijmakers, Alexander J.E.
Design of a forward view antenna for prostate imaging at 7 T
title Design of a forward view antenna for prostate imaging at 7 T
title_full Design of a forward view antenna for prostate imaging at 7 T
title_fullStr Design of a forward view antenna for prostate imaging at 7 T
title_full_unstemmed Design of a forward view antenna for prostate imaging at 7 T
title_short Design of a forward view antenna for prostate imaging at 7 T
title_sort design of a forward view antenna for prostate imaging at 7 t
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6175442/
https://www.ncbi.nlm.nih.gov/pubmed/30022543
http://dx.doi.org/10.1002/nbm.3993
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