Abstract #2333

Should I do 7T fMRI with the pTx or sTx coil? Consider the difference in geometry

Renzo Huber¹, A. Tyler Morgan¹, Alessandra Pizzuti², Benedikt Poser², Barbara Dymerska³, Dario Bosch⁴, Yuhui Chai⁵, Natalia Gudino¹, Joelle Sarlls¹, Sebastian Dresbach², An T Vu⁶, Jennifer Evans¹, Salvatore Torrisi⁶, Rüdiger Stirnberg⁷, Monique Tourell⁸, Saskia Bollmann⁸, Luca Vizioli⁹, Essa Yacoub⁹, Nikos Priovoulos¹⁰, Emma Brouwer¹⁰, Wietske van der Zwaag¹⁰, Hendrik Mattern¹¹, Daniel Gomez¹², Anna Izabella I Blazejewska¹², Jonathan Polimeni¹², and Peter Bandettini¹

¹NIH, Bethesda, MD, United States, ²Maastricht University, Maastricht, Netherlands, ³UCL, London, United Kingdom, ⁴MPI, Tübingen, Germany, ⁵University of Illinois Urbana-Champaign, Urbana-Champaign, IL, United States, ⁶UCSF, SFVAHCS, San Francisco, CA, United States, ⁷DZNE, Bonn, Germany, ⁸University of Queensland, Queensland, Australia, ⁹CMRR, Minneapolis, MN, United States, ¹⁰Spinoza Centre for Neuroimaging, Amsterdam, Netherlands, ¹¹BMMR OVGU, Magdeburg, Germany, ¹²Martinos MGH, Boston, MA, United States

Synopsis

Keywords: fMRI Acquisition, fMRI Acquisition, UHF, pTx, 7 tesla, g-factor

Motivation: Parallel transmit (pTx) coils at 7T are clinically approved, but their advantage for fMRI remains unclear.

Goal(s): We aimed to determine whether widely-used sTx or pTx coils provide better 7T fMRI data.

Approach: We investigated 31 coils across 14 7T sites (SIEMENS and Philips), estimating noise correlation across receivers and mapped transmit field size/location using MR-visible beeswax and CT scans.

Results: pTx coil placement benefits lower brain areas but increases noise coupling. Nova sTx and pTx coils differ in geometry.

Impact: Geometrical design choices play a surprisingly large role for 7T fMRI when choosing the optimal coil.

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