3 March 2012 MCNP simulation of absorbed energy and dose by iodinated contrast agent
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Abstract
The purpose of this study is to investigate the absorbed dose and energy by iodinated contrast medium in diagnostic radiology. A simulation geometry in which an inner sphere (d = 0.2cm, 1cm, 5cm) filled with iodinated contrast medium (or water) is located at the center of a 20cm diameter water sphere was used in simulations performed with MCNP5 codes. Monoenergetic x-rays with energies ranging from 40 to 80keV from a cone beam source were utilized and contrast medium concentration ranged from 100 to 1mg/ml. Absorbed dose ratio (RD) to inner sphere and total absorbed energies ratio (RE) to the whole phantom with and without iodinated contrast medium were investigated. The maximum RD was ~13 for the 0.2cm diameter sphere with 100mg/ml contrast medium. The maximum RE was ~1.05 for the 5cm diameter contrast sphere at 80keV with 100mg/ml contrast medium. Under the same incident photon energy, increasing the inner sphere size from 0.2cm to 5cm caused a ~63% increase in the RD on average. Decreasing the contrast medium concentration from 100 to 10 mg/ml caused a decrease of RD of ~ 76%. A conclusion was reached that although local absorbed dose increase caused by iodinated contrast agent could be high; the increase in total absorbed energy is negligible.
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Wenjun He, Wenjun He, Eugene Mah, Eugene Mah, Walter Huda, Walter Huda, Hai Yao, Hai Yao, "MCNP simulation of absorbed energy and dose by iodinated contrast agent", Proc. SPIE 8313, Medical Imaging 2012: Physics of Medical Imaging, 83131O (3 March 2012); doi: 10.1117/12.911426; https://doi.org/10.1117/12.911426
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