Purpose. We sought to examine the possibility of reducing the contrast medium dosage in dual-energy imaging using a salinemixed\ninjection with a virtualmonochromatic energymethod of dual-source computed tomography (CT). Methods. An X-ray CT\n(SOMATOMDefinition Flash: Siemens, Nurnberg, Germany) was employed.The mixing ratio of contrast medium and saline was\ngradually changed by 10%, followed by a mixed injection into a dynamic blood flow phantom (Nemoto Kyorindo, Japan) which is\na hemodynamic simulation phantomto obtain time-enhancement curves (TECs). Exactly 64 TECs were prepared for each mixing\nratio by changing the energy from40 to 75 keV for monoenergetic imaging. The relationship between the image standard deviation\n(SD) and the energy of the virtual monochromatic image was determined. Combinations of the mixing ratio and energy (keV),\nwhich can maintain high CT numbers and low image SDs for 3D imaging, were tested, and the reduction rate of the contrast\nmedium was calculated. Results. The TECs for the mixed injection method changed linearly with the dilution rates. The mixing\nratios were strongly correlated with the maximum CT number of the TEC (R^2 = 0.98). Contrast CT numbers and image SDs\nincreased by approximately 20% and 25%, respectively, as the energy decreased by 5 keV.The optimal conditions for reducing the\ncontrast medium dose were a mixing ratio of 6:4 and 55 keV of energy. Conclusion. The virtual monochromatic energy method\nreduced the contrast medium dosage by up to 40% for three-dimensional CT-angio (3DCTA) tests.
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