“…The rED values used in our investigation, derived from the International Commission on Radiation Units and Measurements (ICRU) Report 46, are rED = the mean value from CT, 0.26, 1.06, 1.355, 1.05, and 1.022 for the ITV, lung, aorta, bone, heart, and patient (nonspecified tissue) respectively. 25 Planning 4DCTs acquired for six lung cancer patients (11 total tumors) were used to generate CT-based IMRT plans (Table I). Free breathing 4DCT images were acquired using an infrared camera motion-monitoring system (RPM System, Varian) to record the real time respiratory signal that was interfaced with a multislice RT CT scanner (LightSpeed, GE).…”