On rapiscan models (backscatter scans) it is basically software controlled, although the modularization makes it non trivial to be changed in a hack, as reported in this talk: <a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=x_f4HUrn-NA" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=x_f4HUrn-NA</a>