Varian Medical Systems, Inc.;Varian Medical Systems International AG
发明人:
申请号：
EP15152628.2
公开号：
EP2904974A1
申请日:
2015.01.27
申请国别(地区):
EP
年份:
2015
代理人:
摘要：
A radiation dose received by a patient 110 from a radiation therapy system 100 can be verified by acquiring a cine stream of image frames from an electronic portal imaging device (EPID) 108 that is arranged to detect radiation exiting the patient during irradiation. The cine stream of EPID image frames can be processed in real-time to form exit images providing dose measurements at the EPID (e.g., absolute dose as dose-to-water values), which can be representative of the characteristics of the radiation received by the patient. Compliance with predetermined characteristics for the field can be determined during treatment by periodically comparing the dose measurements with the predetermined characteristics, which can include a predicted total dose in the field after full treatment and/or a complete irradiation area outline (CIAO). The system operator can be alerted or the irradiation automatically stopped when non-compliance is detected.
