The following report was received via e-mail:
On October 10, 2017, the Department [Wisconsin Department of Health Services] received a telephone call and email from the licensee's medical physicist that a medical event occurred on August 11, 2017, involving a permanent implant of I-125 seeds for a prostate manual brachytherapy procedure where the total dose delivered differs from the prescribed dose by 20 percent or more. This is a medical event as described in DHS 157.72(1)(a)1.a. The prescribed dose was 145 Gy; the dose delivered was 90 Gy. The licensee uses D90 (dose delivered to 90 percent of the clinical target volume) < 80 percent of prescribed, for determining medical events. Using the licensee's dose based criteria; the dose received by the prostate was 62 percent of the intended dose. The underdose was identified during the post-implant computerized tomography scan on September 11, 2017 and subsequent dosimetric analysis on October 10, 2017.
DHS [Wisconsin Department of Health Services] inspectors will investigate this medical event.
Wisconsin Event Report: WI170016
A Medical Event may indicate potential problems in a medical facility's use of radioactive materials. It does not necessarily result in harm to the patient.