A method and system for controlling the fuel mass to be delivered to an individual cylinder of an internal combustion engine during engine transients caused by intake control device transitions. The methods and compositions of the present invention may be used independently to promote andor maintain iron absorption in a patient or may be used in combination with one or more other compositions used in the treatment of one or more diseases having iron deficiency associated therewith. The mask layer is patterned by way of a lithographically fabricated mask. The computer is also programmed to apply a weighting to the CT view based on the material composition of the CT view and reconstruct an image with differential weighting based on the weighting of the CT view.