1. Energy subtraction method with filtered X-rays for the detection of contrast media
2. A. Maruhashi, K. Yamamoto, M. Matsumoto, Private Communication, 2006.
3. J. H. Hubbell, S. M. Seltzer, Tables of X-ray Mass Attenuation Coefficients and Mass Energy-Absorption Coefficients, NISTIR 5632, National Institute of Standards and Technology, Gaithersburg, MD, 1995.