A method for reducing the incidence of Intraventricular Hemorrhage in preterm infants, involving the administration to those infants of a combination of docosahexaenoic acid and arachidonic acid. A non-rigid 2D3D image registration is performed between pre-operative 3D scan data and intra-operative 2D images. Determinations whether to allocate entry storage in the victim cache may be made responsive in part to the access data for sets reaching the predetermined threshold condition. In addition, by controlling applied voltages with respect to these electrodes, it becomes possible to independently carry out variable control of the above-described variables A and B. , checkpoint information can be received from a reader unit at a checkpoint information input queue of the first operator. The functional operations may be performed at a normal operating speed, while scan shift operations may be performed at a lower speed.