Technical note: output and energy fluctuations of the tomotherapy Hi-Art helical tomotherapy system.
The output and energy calibrations for the first clinical Hi-Art 2.0 helical tomotherapy system have been reviewed. Fixed-gantry/fixed-couch and rotational-gantry/fixed-couch measurements were made on a daily basis over a period of 20 weeks to investigate system stability. Static gantry measurements were taken at 10 cm depth in a rectangular stack of Virtual Water at an SSD distance of 90 cm and a field size of 5 x 40 cm. Rotational gantry measurements were taken in a cylindrical phantom Virtual Water phantom for a field size of 5 x 40 cm. The Hi-Art 2.0 system has maintained its calibration to within +/-2% and energy to within +/- 1.5% over the initial 20 week period.
Mahan
Stephen L
SL
Thompson Cancer Survival Center, Knoxville, Tennessee 37916, USA. smahan@covhlth.com
Chase
Daniel J
DJ
Ramsey
Chester R
CR
D002138:Calibration / Q000592:standards; D019544:Equipment Failure Analysis / Q000379:methods* / Q000592:standards; D018499:Linear Energy Transfer; D011785:Quality Assurance, Health Care / Q000379:methods* / Q000592:standards; D011874:Radiometry / Q000379:methods* / Q000592:standards; D011879:Radiotherapy Dosage / Q000592:standards; D020266:Radiotherapy, Conformal / Q000295:instrumentation* / Q000592:standards; D012015:Reference Standards; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity