if the merging is trivial a mergescale is enough to define the merge rule,
e.g. 1 means do not merge, 2 means to merge the continuous two slices in order, 4 means to merge the continuous 4 slices in order, and so on;</br>
where the <code>&lt;slicemerge&gt;</code> describe how to merge the slices, which can be skipped if the merging is trivial;
now a day most of CT products, the 64-slices, 256-slices CT and others use trivial merging, but a typical 16-slices CT could employ a classical 
designment with 24 no