This disclosure provides a new class of compounds referred to as \u201creversed chloroquines\u201d, which are highly effective against CQR and CQS malaria parasites. The rigid structure according to the invention includes an offset rib for the attachment body, this rib being mounted fixed on the box between the box and the engine and carrying the attachment body. This reduces the size of the image reader. The energy spectrum and angular distribution of the coherently-scattered radiation are used to characterize the volume element of the suspect object.