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Magnetic Resonance Imaging

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Imaging the Internal Auditory Canal with an 8 × 2 Transceiver Array Head Coil at 7T.

A Nada¹, J P Cousins², A Rivera³

¹From the Washington University in St. Louis (A.N.), School of Medicine, Mallinckrodt Institute of Radiology, St. Louis, Missouri anada@wustl.edu.

AJNR. American Journal of Neuroradiology

|March 27, 2025

Summary

A new 7T neuroimaging coil significantly improves visualization of the inferior brain and internal auditory canal (IAC). This advanced transceiver coil overcomes limitations of standard coils, enabling clearer imaging of crucial brain structures.

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Area of Science:

Radiology
Medical Imaging
Neuroscience

Background:

7T neuroimaging faces challenges with B1+ strength, homogeneity, and B0 susceptibility, particularly in inferior brain regions.
Standard imaging coils often struggle to provide adequate signal quality for detailed anatomical assessment in these areas.

Purpose of the Study:

To evaluate the effectiveness of a decoupled 8x2 transceiver coil and shim insert for imaging the internal auditory canal (IAC) and inferior brain at 7T.
To compare the performance of the new transceiver coil against the standard Nova 8/32 coil for specific neuroimaging applications.

Main Methods:

Comparison of B1+ field strength, B0 susceptibility, and T2 sampling perfection with application-optimized contrasts by using flip angle evolution (SPACE) sequences.
Acquisition of T2-weighted turbo spin echo (T2 TSE) images in 8 healthy adults using a Terra 7T system.
Blind evaluation of IAC and surrounding structures by two neuroradiologists using a 5-point Likert scale.

Main Results:

The standard Nova 8/32 coil exhibited reduced B1+ strength in inferior regions compared to the whole brain.
The new transceiver coil maintained consistent B1+ performance across the entire brain, including inferior regions.
SPACE images acquired with the transceiver coil showed significantly better performance, with higher scores for IAC visualization (4.0 ± 0.8) compared to the Nova coil (2.5 ± 0.8).

Conclusions:

The decoupled 8x2 transceiver coil demonstrates superior B1+ performance in inferior brain regions at 7T.
Improved B1+ homogeneity facilitates enhanced visualization of the IAC and other inferior brain structures using T2-weighted imaging.
This technology advances the capability of 7T MRI for detailed anatomical assessment of challenging brain areas.