Simulation of a Gradient System for a Helium-Free Magnetic Resonance Imagerстатья
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Дата последнего поиска статьи во внешних источниках: 25 мая 2022 г.
Аннотация:Many of the world’s leading manufacturers of magnetic resonance imagers (MRIs) pay considerable attention to reducing the consumption of liquid helium in modern magnetic MRI systems. This is primarily due to the significantly increasing price of liquid helium in recent years and the persistence of this tendency in the future, as well as the additional costs and difficulties associated with its delivery, storage, and use. For this reason, superconducting magnetic systems for MRIs that do not require liquid helium are being developed. One of the problems of helium-free magnetic systems is the increased risk of a transition from the superconducting state even with a short-term excess of the heat input over the cooler capacity, which is compensated in traditional systems by the liquid-helium evaporation. Along with the heat input due to the thermal conductivity of the cryostat and the supply elements, the eddy currents that arise in the conducting magnet structures during generation of an alternating magnetic field by the gradient MRI system are also a source of heat. Such an additional heat input was taken into account in this study when developing a gradient system for a helium-free MRI. This paper presents the calculation and modeling of a gradient system for a helium-free MRI.