Abstract
In modern magnetic resonance imaging, signal detection is performed by dense arrays of radiofrequency resonators. Tight-fitting arrays boost the sensitivity and speed of imaging. However, current devices are rigid and cage-like at the expense of patient comfort. They also constrain posture, limiting the examination of joints. For better ergonomics and versatility, detectors should be flexible, adapt to individual anatomy, and follow posture. Towards this goal, the present work proposes a novel design based on resonators formed by liquid metal in polymer tubes. Textile integration creates lightweight, elastic devices that are worn like pieces of clothing. A liquid-metal array tailored to the human knee is shown to deliver competitive image quality while self-adapting to individual anatomy and adding the ability to image flexion of the joint. Relative to other options for stretchable conductors, liquid metal in elastic tubes stands out by reconciling excellent electrical and mechanical properties with ease of manufacturing.
Highlights
In modern magnetic resonance imaging, signal detection is performed by dense arrays of radiofrequency resonators
While for improved sensitivity it is desired that the coil array closely surrounds the anatomy of interest, the array must fit a large variety of anatomical sizes
Stretchable MR coils made from eutectic Gallium Indium liquid metal contained in silicone tubes are feasible
Summary
In modern magnetic resonance imaging, signal detection is performed by dense arrays of radiofrequency resonators. Current devices are rigid and cage-like at the expense of patient comfort They constrain posture, limiting the examination of joints. For better ergonomics and versatility, detectors should be flexible, adapt to individual anatomy, and follow posture Towards this goal, the present work proposes a novel design based on resonators formed by liquid metal in polymer tubes. Radiofrequency and gradient fields are employed for excitation of tissue and spatial encoding, respectively Precise actuation of the latter two fields through MRI sequences gives rise to the generation of MR signals from which tomographic images are calculated. The resulting size of a conventional coil array inevitably limits attainable sensitivity in some patients and comfort in others
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