Complete an already computed Monte-Carlo
A complete RT calculation requires the consideration of direct and scattered radiation.
As a reminder, in CIVA, the calculation of scattered radiation is performed via a Monte-Carlo calculation for which the user must define a number of photons to model. This Monte-Carlo calculation can sometimes take several hours (depending on the complexity of the configuration – thick part or very absorbent material…).
In several versions before CIVA 2023
After having performed a complete simulation (taking into account direct and scattered radiation), it is possible to reuse the Monte-Carlo already calculated for other simulations.
This option allows the user to change one or more parameters of the model (size or position of the defects for example) while keeping the same scattered radiation as during the first calculation.
CIVA will then calculate only the direct radiations and combine them with the scattering obtained from the loaded Monte-Carlo file. The new calculation will be completed in a few seconds / minutes instead of several hours.
From now on, to use this option, you have to select the drop-down list in the Monte-Carlo options, and click on “Import Monte-Carlo computation”.
As a reminder, this option only works in the same size and resolution for the detector and the same source spectrum.
Since CIVA 2023
A new option is available: the “Complete Monte-Carlo” option. This option allows the user, if they think the Monte-Carlo calculation has not converged (not enough photons), to restart another Monte-Carlo calculation using the photons already calculated. No need to restart the full simulation from scratch!
For example, if the initial calculation contains 80E09 photons and you want to model 100E09 photons, you will only have to calculate 20E09 photons.
