Dense Array, Low Field Magnetic Resonance Imaging Devices for Combat Casualty Care

Abstract

AbstractMagnetic resonance imaging (MRI) is a non-invasive method capable of producing high spatial resolution images of body structures and identifying injuries. However, conventional MRI systems use large superconducting magnets (≥ 1Tesla) that require high operating costs, long exam times, metal free environments, and are impractical to transport. Portable MRI systems using ultra-low magnetic fields in the micro- to milli-tesla range with superconducting quantum interference device (SQUID) technology have been developed, but these systems generate low signal-to-noise ratios (SNR), requiring very long averaging times to obtain modest spatial resolution. The initial phase of this project involved the development of a low field MRI system and resulted in the preliminary design of a transportable low-field (0.1 Tesla) MRI system, which has the advantages of ultra-low and high field MRI systems while avoiding their disadvantages. The current phase of the project is developing a small-scale portable low-field MRI system prototype of the full sized system. Development of this technology will have significant applications in both commercial and military settings.KeywordsMagnetic resonance imaging (MRI)superconducting quantum interface devices (SQUIDs)ultra-low frequency (ULF)magnetic fieldssignal-to-noise ratio (SNR)traumatic brain injury (TBI)