Peyman Shokrollahi

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INTRODUCTION Eye movements convey important information about brain function. Neuropsychiatric conditions and medications may produce abnormal eye movements (EMs) in sleep. Serotonergic drugs are known to increase nocturnal EMs. Few studies have quantified sleep EMs due to technical complexity. We investigated the effects of serotonergic drugs on slow EMs(More)
US (Ultrasonic) motors have potential applications as MR-compatible actuators for MRI-guided surgical robots. MR compatibility test of US motors (Shinsei USR 30 and USR 60) were performed in 3T MRI scanner under baseline, power-off, power-on, and moving configurations with mounting orientations parallel and perpendicular to the longitudinal bore axis.(More)
A significant amount of data is not attended to clinically in routine sleep studies. Measures of sleep physiology not obvious to the human eye may provide important clues to disease states, and responses to therapy. For example, it has been noted that eye movements change significantly in patients exposed to antidepressant medications. This paper describes(More)
BACKGROUND Safe robot-assisted intervention using magnetic resonance imaging (MRI) guidance requires the precise control of assistive devices, and most currently available tools are rarely MRI-compatible. To obtain high precision, it is necessary to characterize and develop existing MRI-safe actuators for use in a high magnetic field (≥3 T). Although an(More)
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