Yingming Amy Chen

Abstract BACKGROUND AND PURPOSE: Low-field portable MRI (pMRI) has been shown to be a useful alternative neuroimaging tool in the emergency department (ED) and intensive care unit (ICU), potentially addressing challenges associated with the transport of critically ill patients. We aimed to evaluate the intermodality reliability between low-field pMRI and conventional neuroimaging (CN) for assessment of ventricular size and hydrocephalus.

ABBREVIATIONS: CN conventional neuroimagingED emergency departmentICU intensive care unitLOA limit of agreementpCT portable CTpMRI portable MRISTARD Standards for Reporting Diagnostic AccuracyTCS transcranial ultrasound SUMMARY PREVIOUS LITERATURE: Low-field pMRI can detect acute neurologic conditions such as ischemic stroke and intracranial hemorrhage and offers a safe point-of-care alternative to CN in emergency departments and intensive care units.

1. Introduction Solar flares release a large amount of X-ray radiation during their eruption, which directly affects the D and E layers of the ionosphere, significantly increasing electron density. These rapid changes typically occur within minutes and can lead to dramatic fluctuations in the propagation characteristics of low-frequency signals, manifested as sudden increases or decreases in signal strength.