Simulation Study on an Energy-Modulated X-ray CT

In an X-ray CT system the energy fluence of X-rays is commonly measured with scintillation detectors in the data acquisition. To enhance the contrast in low contrast media we proposed a new concept of X-ray CT system. This technique utilized the information for an energy spectrum of X-rays. That is, we applied more than two voltages to an X-ray tube and obtained data measured with different energy spectra. Without increasing the irradiation dosage of X-rays, the contrast enhancement was carried out with arithmetic between these reconstructed images. The aim of this study is to clarify the validity of such an energy-modulated X-ray CT with simulations.