The following information was received from the State of
Florida Bureau of Radiation Control via e-mail:
Patient was scheduled to receive a 2 fraction treatment to the breast over a five day period - for a total ten fractions. Prior to the last two fractions the doctor went out of town. The new doctor discovered that the calculated center of the balloon was off by 4 mm. The doctor chose to cancel the ninth & tenth fractions. Subsequent calculations showed the dose received was approximately 19 [to] 35% less than prescribed, depending on axis used relative to the catheter. The patient has been notified. This office was notified the day the last two fractions were canceled on May 14. However, review of events and the dose calculations were not complete until May 18. Licensee will send a written report on this event. Examination of this report will determine future Florida actions.
The fraction treatments were delivered using a Mammosite with an
Ir-192, 6 Curie source. The maximum dose the patient received was calculated to be 2720 centiGray.