Tackling SNR at low-field: a review of hardware approaches for point-of-care systems

• Published in: Magma (New York, N.Y.) Vol. 36; no. 3; pp. 375 - 393
• Main Authors: Webb, Andrew, O’Reilly, Thomas
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01.07.2023
• Subjects: Basic Science - Engineering; Biomedical Engineering and Bioengineering; Computer Appl. in Life Sciences; Equipment Design; Health Informatics; Imaging; Magnetic Resonance Imaging - methods; Medicine; Medicine & Public Health; Phantoms, Imaging; Point-of-Care Systems; Radio Waves; Radiology; Review; Signal-To-Noise Ratio; Solid State Physics; Low-field MRI; Grounding; Shielding; Litz wire; Point-of-care; Magnets; RF coils
• ISSN: 1352-8661; 0968-5243; 1352-8661
• DOI: 10.1007/s10334-023-01100-3

Objective To review the major hardware components of low-field point-of-care MRI systems which affect the overall sensitivity. Methods Designs for the following components are reviewed and analyzed: magnet, RF coils, transmit/receive switches, preamplifiers, data acquisition system, and methods for grounding and mitigating electromagnetic interference. Results High homogeneity magnets can be produced in a variety of different designs including C- and H-shaped as well as Halbach arrays. Using Litz wire for RF coil designs enables unloaded Q values of ~ 400 to be reached, with body loss representing about 35% of the total system resistance. There are a number of different schemes to tackle issues arising from the low coil bandwidth with respect to the imaging bandwidth. Finally, the effects of good RF shielding, proper electrical grounding, and effective electromagnetic interference reduction can lead to substantial increases in image signal-to-noise ratio. Discussion There are many different magnet and RF coil designs in the literature, and to enable meaningful comparisons and optimizations to be performed it would be very helpful to determine a standardized set of sensitivity measures, irrespective of design.