Portal Dosimetry and Gamma Histograms http://isocentre.wikidot.com/forum/t-304875/portal-dosimetry-and-gamma-histograms Posts in the discussion thread "Portal Dosimetry and Gamma Histograms" - Using Portal dosimetry and Gamma Histograms for Plan Evaluation Fri, 04 Sep 2026 14:50:01 +0000 http://isocentre.wikidot.com/forum/t-304875#post-992969 Portal Dosimetry and Gamma Histograms http://isocentre.wikidot.com/forum/t-304875/portal-dosimetry-and-gamma-histograms#post-992969 Thu, 03 Feb 2011 09:43:07 +0000 Ayan Basu 417597 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?

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