2021/07/08 by Elizaveta Motovilova, Motovilova, Elizaveta, Ek Tsoon Tan +17 · 1 citation
Engineering · Medicine · Physics and Astronomy · #Acoustics #Advanced MRI Techniques and Applications #Advanced Sensor and Energy Harvesting Materials #Biomedical engineering #Characterization and Applications of Magnetic Nanoparticles #Computer science #Electrical engineering #Electromagnetic coil #Engineering #FOS: Physical sciences #Magnetic resonance imaging #Materials science #Medical Physics (physics.med-ph) #Nuclear magnetic resonance #Offset (computer science) #Physics #Radiofrequency coil #SIGNAL (programming language) #physics.med-ph
paper · pdf · doi:10.48550/arxiv.2107.03995
published in arXiv (Cornell University) (Cornell University)
arxiv created 2021/07/08 · arxiv updated 2021/07/09
Magnetic resonance imaging systems rely on signal detection via\nradiofrequency coil arrays which, ideally, need to provide both bendability and\nform-fitting stretchability to conform to the imaging volume. However, most\ncommercial coils are rigid and of fixed size with a substantial mean offset\ndistance of the coil from the anatomy, which compromises the spatial resolution\nand diagnostic image quality as well as patient comfort. Here, we propose a\nsoft and stretchable receive coil concept based on liquid metal and\nultra-stretchable polymer that conforms closely to a desired anatomy. Moreover,\nits smart geometry provides a self-tuning mechanism to maintain a stable\nresonance frequency over a wide range of elongation levels. Theoretical\nanalysis and numerical simulations were experimentally confirmed and\ndemonstrated that the proposed coil withstood the unwanted frequency detuning\ntypically observed with other stretchable coils (0.4% for the proposed coil as\ncompared to 4% for a comparable control coil). Moreover, the signal-to-noise\nratio of the proposed coil increased by up to 60% as compared to a typical,\nrigid, commercial coil.\n