Recent Advances in Compact Portable Platforms and Gradient Hardware for Brain MRI.

While pivotal in modern radiology for brain imaging, conventional whole-body MRI scanners face challenges related to their size, cost, and technical limitations, restricting accessibility for a wide range of patients. This article explores recent advances aiming to address these issues, with a focus on compact MRI scanners, portable low-field-strength MRI systems, and high-performance gradient inserts. Compact MRI scanners, specifically those at field strengths ranging from 0.5 to 7 T, in contrast to their whole-body counterparts, improve gradient performance and simplify installation. These compact scanners are typically fixed systems designed for cost reduction, space saving, and easy siting while also requiring much less cryogen yet supporting the use of high-performance gradients. Portable low-field-strength MRI systems (<0.5 T) provide flexible and cost-effective on-site imaging solutions. These portable systems are designed for mobility and increased accessibility, albeit with some quality trade-offs. All these compact scanners and portable systems have smaller physical footprints than conventional scanners due to reduced magnet size and bore width. Many are designed mainly for brain imaging. High-performance gradient inserts enhance existing MRI systems by providing superior spatial resolution or imaging speed, crucial for advanced neuroimaging. These innovations collectively promise to make MRI more accessible or versatile, transforming radiology practices across diverse clinical settings.