Cineangiography Using Particle-Induced Dual-Wavelength Pulsed-X-rays for Minimization of Dosages of Contrast Medium and Radiation

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We irradiated a rotating target with two metallic plates made of different elements by a MeV proton beam, and alternately produced quasi-monochromatic pulsed X-rays with two different energies: one was lower and the other was higher than the absorption-edge energy of the contrast medium. A cineradiograph of a phantom containing contrast medium was taken using these pulsed X-rays. A moving image which emphasized only the contrast medium was reconstructed by taking the difference between the adjacent frames. From this result, we found that the contrast-medium concentration and the X-ray dose for cineangiography could be reduced by applying this method.