[en] For intravenous coronary angiography, the authors of this paper have developed an imaging system based on iodine K-edge energy subtraction. In an animal experiment, dynamic imaging of coronary arteries was achieved with an original high-speed x-ray switching method with use of an iodine filter. A mixed-energy (higher and lower than the K edge) x-ray image was obtained without filtering, and a lower-energy image was acquired with the filter inserted. THe K-edge subtraction image was computed from these two images. An oscillating mirror optics in x-ray image intensifier TV were developed for this high-speed dual-energy imaging