At this point in the calibration process you should have completed all of the tasks described in the Central Axis Measurements section.
In this section of the tutorial we will modify the initial PS model that assumed a uniform distribution of patch-source strength over the surface of the plaque to instead create a nonuniform distribution of source strength which better reproduces the near-surface measurements provided on BEBIG protocol sheet 2.
This will be accomplished by first entering the surface measurement data and then launching a simulated annealing process which iteratively redistributes source strength amongst the patches with the objective of reducing the RMS % error between the calculated and measured dose at the near-surface measurement points.