Abstract
Traditionally, it has been difficult to visualize acute cerebral stroke from images
produced by X-ray computed tomography（ CT）. We have recently developed a phantom that
simulates acute cerebral stroke. We attempted to visualize an acute-stage cerebral infarction
by using Dual-Energy CT（ DECT） to obtain composite imaging of this phantom. Composite
images were created by using DECT voltages combination at 80 kV/Sn 140 kV, 100 kV/Sn
140 kV, 140 kV/80 kV, were obtained in such a way that the sum of the assigned weight
coefficients became 1.0. Calculation of the CNR values allowed us to evaluate the visualization
of acute-stage cerebral infarction. The CNR value of composite images were the highest at
low energy side 0.5, high energy side 0.5, under 80 kV/Sn 140 kV and 140 kV/80 kV, and at
low energy side 0.6, high energy side 0.4, under 100 kV/Sn 140 kV. The CNR values of
composite images at weight coefficients between 0.4 and 0.6 were significantly higher than
those obtained for all other created coefficients images. Therefore, the optimal conditions for
visualizing acute cerebral stroke were achievable.
