How to compare two 3D dose distributions


This workspace (Gel dosimetry vs. TPS) provides several tools for a user to perform a comparison between two dose distribution 3D cubes:

  • measured with the aid of 3D dosimetry
  • calculated with the aid of a treatment planning system (TPS).

It is also possible to compare two dose distributions generated with the same dosimetric system and in addition, the user can analyse a single dose distribution generated by only one dosimetric system.


The workspace provides all the necessary tools for performing the comparison, which are typical for routine radiotherapy dosimetry, including:


- calculating the gamma index in 2D and 3D

- calculating the gamma angle in 2D and 3D

- calculating the difference in 2D and 3D

- calculating the correlation between 2 datasets

- calculating the histograms

- viewing of isodoses

- viewing of dose distributions on plane-by-plane basis

- viewing of dose distributions in 3D

- calculating data for a region of interest (ROI)


It should be noted that for the purpose of dose distribution measurements and the verification of measured dose distribution by a 3D polymer gel dosimeter the GeVero Co. Verification phantom 1 and 2 could be used. They are adapted for inserting the FC65-G and CC04 ionisation chambers, respectively, to measure the dose at a point in the radiation scattering conditions provided by a polymer gel dosimeter.


The movie above presents how to compare easily two datasets: the measured 3D dose distribution with a polymer gel dosimeter and the calculated 3D dose distribution with the aid of TPS delivered to the polymer gel dosimeter.