VARIAN MEDICAL SYSTEMS, INC.;VARIAN MEDICAL SYSTEMS INTERNATIONAL AG
发明人:
Christof Baltes,Todd Holmes
申请号：
US14175492
公开号：
US09265971B2
申请日:
2014.02.07
申请国别(地区):
US
年份:
2016
代理人:
摘要：
A radiation dose received by a patient from a radiation therapy system can be verified by acquiring a cine stream of image frames from an electronic portal imaging device (EPID) 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 absolute dose measurements at the EPID (dose-to-water values), which is 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 absolute 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.
