Abstract
To determine whether functional near-infrared spectroscopy (fNIRS) allows monitoring fatigue in radiologists during prolonged image interpretation. Nine radiologists participated as subjects in the present study and continuously interpreted medical images and generated reports for cases for more than 4h under real clinical work conditions. We measured changes in oxygenated hemoglobin concentrations [oxy-Hb] in the prefrontal cortex using 16-channel fNIRS (OEG16ME, Spectratech) every hour during the Stroop task to evaluate fatigue of radiologists and recorded fatigue scale (FS) as a behavior data. Two subjects showed a subjective feeling of fatigue and an apparent decrease in brain activity after 4h, so the experiment was completed in 4h. The remaining seven subjects continued the experiment up to 5h. FS decreased with time, and a significant reduction was observed between before and the end of image interpretation. Seven out of nine subjects showed a minimum [oxy-Hb] change at the end of prolonged image interpretation. The mean change of [oxy-Hb] at the end of all nine subjects was significantly less than the maximum during image interpretation. fNIRS using the change of [oxy-Hb] may be useful for monitoring fatigue in radiologists during image interpretation.
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