SQUID-based instrumentation for ultra-low-field MRI

Simple item page
dc.creatorZotev, V. S.
dc.creatorMatlashov, A. N.
dc.creatorVolegov, P. L.
dc.creatorUrbaitis, A. V.
dc.creatorEspy, M. A.
dc.creatorKraus Jr, R. H.
dc.date2007-05-04
dc.date2007-07-30
dc.date.accessioned2026-07-07T08:36:44Z
dc.date.available2026-07-07T08:36:44Z
dc.descriptionMagnetic resonance imaging at ultra-low fields (ULF MRI) is a promising new imaging method that uses SQUID sensors to measure the spatially encoded precession of pre-polarized nuclear spin populations at a microtesla-range measurement field. In this work, a seven-channel SQUID system designed for simultaneous 3D ULF MRI and magnetoencephalography (MEG) is described. The system includes seven second-order SQUID gradiometers, characterized by magnetic field resolutions of 1.2 - 2.8 fT/rtHz. It is also equipped with five sets of coils for 3D Fourier imaging with pre-polarization. Essential technical details of the design are discussed. The system's ULF MRI performance is demonstrated by multi-channel 3D images of a preserved sheep brain acquired at 46 microtesla measurement field with pre-polarization at 40 mT. The imaging resolution is 2.5 mm x 2.5 mm x 5 mm. The ULF MRI images are compared to images of the same brain acquired using conventional high-field MRI. Different ways to improve imaging SNR are discussed.
dc.descriptionTo appear in Proceedings of 11th International Superconductive Electronics Conference (ISEC 2007); 8 pages, 11 figures
dc.identifierhttps://arxiv.org/abs/0705.0661
dc.identifierhttp://arxiv.org/abs/0705.0661
dc.identifierSuperconductor Science and Technology 20, S367 (2007)
dc.identifierdoi:10.1088/0953-2048/20/11/S13
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/140164
dc.subjectMedical Physics
dc.subjectInstrumentation and Detectors
dc.titleSQUID-based instrumentation for ultra-low-field MRI
dc.typetext

Files

Collections

arXiv