n our simulations and reconstructions the detectors' position and other system geometries are base on the calibration table and data/parameters 
set in the configure files, but the so called 'slice thickness' is only a name, a tag key to help the program finding which the slices are.
In section 2.1 we discussed a subsystem <a href="./configurethesimulation.html#systemconsole"><code>&lt;console&gt;</code></a> which contain a tag 
<a href="./configurethesimulation.html#systemconsole"><code>&lt;collimatorexpla