Would be interested to know how many / which centers are using portal dosimetry for radiotherapy plan evaluation :
1.Do you use Gamma Histograms to evaluate calculated dose distributions against measured ( Portal Dosimetry)?
2.Do you use Gamma Histograms to validate your planning systems ?
3.Is it acceptable to use an acceptance criteria of 3% Dose Difference & 3mm Distance To Agreement (DTA) for all sites?
4.Is it a valid concern that commercially available planning systems bundling different algorithms for Treatment Planning & Dose Calculation and a Monte Carlo for inter-comparison using Gamma Histograms OR Portal Dosimetry licenses for inter-comparison using Gamma Histograms might give a false sense of security during IMRT QA since they are on the same platform and from the same vendor?