Low‐field MRI: A report on the 2022 ISMRM workshop

Abstract

In March 2022, the first ISMRM Workshop on Low‐Field MRI was held virtually. The goals of this workshop were to discuss recent low field MRI technology including hardware and software developments, novel methodology, new contrast mechanisms, as well as the clinical translation and dissemination of these systems. The virtual Workshop was attended by 368 registrants from 24 countries, and included 34 invited talks, 100 abstract presentations, 2 panel discussions, and 2 live scanner demonstrations. Here, we report on the scientific content of the Workshop and identify the key themes that emerged. The subject matter of the Workshop reflected the ongoing developments of low‐field MRI as an accessible imaging modality that may expand the usage of MRI through cost reduction, portability, and ease of installation. Many talks in this Workshop addressed the use of computational power, efficient acquisitions, and contemporary hardware to overcome the SNR limitations associated with low field strength. Participants discussed the selection of appropriate clinical applications that leverage the unique capabilities of low‐field MRI within traditional radiology practices, other point‐of‐care settings, and the broader community. The notion of “image quality” versus “information content” was also discussed, as images from low‐field portable systems that are purpose‐built for clinical decision‐making may not replicate the current standard of clinical imaging. Speakers also described technical challenges and infrastructure challenges related to portability and widespread dissemination, and speculated about future directions for the field to improve the technology and establish clinical value.

Preliminary Experience with Three Alternative Motion Sensors for 0.55 Tesla MR Imaging

“…Various types of motion, including bulk, respiratory, and cardiac motion, have been identified during scanning, each requiring distinct correction strategies. With the growing interest in imaging at lower field strengths to enhance MRI accessibility and cost-effectiveness, the relevance and complexity of motion correction are amplified [ 4 , 5 ]. Due to the signal-to-noise ratio (SNR) diminution inherent in low-field MRI, longer scan times are required, which exacerbates both patient discomfort and susceptibility to motion artifacts [ 6 ].…”

Diffusion tensor brain imaging at 0.55T: A feasibility study

“…There has recently been a substantial resurgence of interest in MRI systems with lower B 0 field strengths. [1][2][3][4][5][6][7] These systems can now perform much better than historical lower-field magnets due to modern improvements in MRI hardware (e.g., magnet design, gradient systems, etc. ), and offer potential advantages in value and accessibility (among other possible benefits) compared to higher-field systems.…”