A simple head-sized phantom for realistic static and radiofrequency characterization at high fields

Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine
Wyger M BrinkAndrew G Webb

Abstract

To demonstrate a simple head-sized phantom for realistic static and RF field characterization in high field systems. The head-sized phantom was composed of an ellipsoidal compartment and a spherical cavity to mimic the nasal cavity. The phantom was filled with an aqueous solution of polyvinylpyrrolidone (PVP), to mimic the average dielectric properties of brain tissue. The static and RF field distributions were characterized on a 7T MRI system and compared to in vivo measurements and simulations. MR thermometry was performed, and the results were compared to thermal simulations for RF validation purposes. Accurate reproduction of both static and RF fields patterns observed in vivo was confirmed experimentally and was shown to be strongly affected by the inclusion of the spherical cavity. MR thermometry and transmit efficiency ( B1+) measurements were obtained in close agreement with simulations (peak values agreeing within 0.3 °C and 0.02 μT/√W) as well as fiber optic thermal probes (RMSE < 0.18 °C). A simple head-sized phantom has been presented that produces B0 and B1+ nonuniformities similar to those encountered in the human head and allows for accurate MR thermometry measurements, making this a suitable reference phantom fo...Continue Reading

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Citations

Feb 2, 2019·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Zhipeng CaoWilliam A Grissom
Sep 5, 2019·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Thomas RuytenbergIrena Zivkovic
Jul 9, 2020·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Lukas WinterBernd Ittermann
Jul 15, 2020·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Natalia GudinoJeff H Duyn
Dec 24, 2020·NMR in Biomedicine·Sossena WoodTamer S Ibrahim
Oct 16, 2020·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Jannis HanspachFrederik B Laun
Dec 8, 2020··I. ZivkovicA. Webb

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