Two-dimensional energy-resolving "transXend" detector was developed with using a flat panel detector consisted of a scintillator plate and Si pixels. With changing filters at the exit of X-ray tube, the principle of the transXend detector can be applied. Computed tomography (CT) measurements were performed for an acrylic phantom with two titanium rods. In the conventional CT image, significant metal artifact was observed. The energy-resolved CT images, especially, reconstructed by the X-rays with their energy 70-90 keV, showed little effect of the metal artifact.