It has been reported to philips that the patient experienced hair loss after undergoing a brain arteriovenous malformation procedure on the philips allura x-ray system.The patient received a total dose of 7.4 gy during a total irradiation time of 4 hours and 35 minutes.Philips inspected the system onsite and analyzed the log file and no malfunction was found.Deterministic effects or tissue reactions may occur when the radiation dose has exceeded a certain threshold level, which may depend on the irradiated tissue or organ and on the patient's sensitivity to radiation.The threshold is typically 3 gy for temporary hair loss.Deterministic effects are described in the instructions for use (b)(4).
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