Recently, a simple solution was found to the image distom tion problem caused in the oximeter by high-frequency elec trical noise from the pulsing of the gradient and radio-fme quency coils. The cable connecting the sensor to the oximeter (Nonin 8604D-L; Nonin Medical, Plymouth, Minn) was wound around two radio-frequency chokes (low-pass filters). These chokes prevent high-frequency noise from reaching the MRimager by means of the oximetemcable. No imaging arti facts existed when we used this arrangement with a 1.5-T sys tem (Signa; GE Medica' Systems, Milwaukee). In addition, the oximeter functioned continuously, even during pulsing. One other problem of lesser importance is that oximeters have metal cases and components that could be pulled into the magnet; typically, this problem can be solved by placing the oximetem sufficiently far from the magnet. Similarly, the radio-frequency chokes are ferromagnetic and must be placed sufficiently far from the magnet or secured. As anesthesiologists, we believe that sedated patients me quire appropriate monitoring, including both careful observa tion by skilled clinicians and measurement of clinical parame ters including heart and respiratory mates, airway patency, ventilation, and oxygenation. Technologies other than oxi metry have been readily available to monitor these other pa rameters. Now that an oximetem can safely and continuously monitor patients undergoing MR imaging without creating imaging artifacts, we believe that oximetry should be consid ered part of the standard practice for monitoring sedated pe diatric patients during radiologic procedures.