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This is a Quantitative Study study.

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September 17, 2025

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

Key Points

Results indicate that pTx coil placement enhances imaging of lower brain areas, yet it increases noise coupling.
The study evaluated 31 different coils across 14 7T sites, emphasizing the importance of coil geometry on fMRI data.
Using MR-visible beeswax and CT scans allowed for the mapping of transmit field size and location in the coils tested.
Geometrical design significantly influences the efficacy of different coils in 7T fMRI, underscoring the importance of coil selection.

Abstract

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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