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Radiation exposure to the orthopaedic surgical team during fluoroscopy: "how far away is far enough?"
1University of Cincinnati College of Medicine, Children's Hospital Medical Center, OH, USA.
Objectives:
To correlate the amount of radiation exposure to members of the orthopaedic surgical team based on their relative positions during a simulated fluoroscopically assisted orthopaedic procedure.
Design:
Experimental study using commercially available fluoroscopic units and dosimetry badges designed to measure "eye" (ocular lens), "shallow" (hands/skin), and "deep" (whole-body) radiation exposure.
Setting:
Standard hospital operating room at a level one trauma center.
Participants:
Dosimetry badge clusters at specified distances from a fluoroscopic x-ray beam. Represented positions were direct beam contact, surgeon (12 in/30.5 cm), first assistant (24 in/70 cm), scrub nurse (36 in/91.4 cm), and anesthesiologist (60 in/152.4 cm).
Intervention:
Dosimetry badges were systematically exposed by a protocol intended to maximize radiation scatter. A maximum time for continuous fluoroscope use was set at ten minutes.
Main Outcome Measurements:
Radiation exposure readings from dosimetry badges processed by a commercially available dosimetry service.
Results:
Maximum readings are reported. Direct beam contact resulted in approximately 4000 mrem/minute (40 mSv/min) of radiation exposure. Deep exposure for the surgeon and first assistant was 20 mrem/min (0.2 mSv/min) and 6 mrem/min (0.06 mSv/min), respectively. Superficial exposure was 29 mrem/min (0.29 mSv/min) for the surgeon and 10 mrem/min (0.1 mSv/min) for the first assistant. Eye exposure was 10 mrem/min (0.1 mSv/min) for the surgeon and 6 mrem/min (0.06 mSv/min) for the first assistant. At the scrub nurse position, no deep or eye exposure was detected. One positive badge for shallow exposure was noted at the scrub nurse position, reflecting a 2 mrem/min (0.02 mSv/min) exposure rate. After ten minutes of continuous exposure, badges assigned to the anesthesiologist position never registered any positive readings.
Conclusions:
These results indicate that unprotected individuals working twenty-four inches (70 cm) or less from a fluoroscopic beam receive significant amounts of radiation, whereas those working thirty-six inches (91.4 cm) or greater from the beam receive an extremely low amount of radiation.