Improved Brain MR Imaging from a Compact, Lightweight 3T Scanner with High-Performance Gradients

Area of Science:

• Radiology and Medical Imaging
• Magnetic Resonance Imaging (MRI) Technology

Background:

• A novel low-cryogen, compact 3T (C3T) MRI scanner with advanced gradient performance (80 mT/m amplitude, 700 T/m/s slew rate) has been utilized for research since 2016.
• This C3T system has not yet been integrated into clinical practice, necessitating a comparison with established MRI technologies.

Purpose of the Study:

• To prospectively compare head MRI examinations acquired using the C3T system against those from a conventional whole-body 3T (WB3T) scanner.
• The comparison focused on seven image quality parameters across five standard brain imaging sequences.

Main Methods:

• Thirty patients undergoing clinically indicated head MRI scans were included in this prospective study.
• Images were acquired using five sequences: T1 FLAIR, T1 MP-RAGE, 3D T2 FLAIR, T2 FSE, and DWI on both C3T and WB3T systems.
• Three blinded, board-certified neuroradiologists assessed image quality using a five-point Likert scale, evaluating signal-to-noise ratio, lesion conspicuity, motion artifact, contrast, and overall quality.

Main Results:

• The C3T system demonstrated superior performance across most evaluated parameters compared to the WB3T system.
• Exceptions included motion artifacts on T1 FLAIR and T1 MP-RAGE sequences, where the WB3T system was rated better.
• When all sequences were analyzed collectively, the C3T system outperformed the WB3T system in all image quality metrics except for motion artifact (P=0.13).

Conclusions:

• The compact 3T (C3T) MRI scanner provides enhanced overall image quality for head examinations compared to conventional whole-body 3T scanners.
• The C3T system excels in most image quality aspects, with the exception of motion artifacts on specific T1-weighted sequences.