CTA source images acquired during a steady state of contrast concentration for both the arterial and tissue−time-attenuation curves (ΔT) are predominantly.

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Presentation transcript:

CTA source images acquired during a steady state of contrast concentration for both the arterial and tissue−time-attenuation curves (ΔT) are predominantly blood-volume− rather than blood-flow−weighted. CTA source images acquired during a steady state of contrast concentration for both the arterial and tissue−time-attenuation curves (ΔT) are predominantly blood-volume− rather than blood-flow−weighted. The change in attenuation due to iodine administration is directly proportional to its concentration. CBV equals the ratio of the areas under the 2 curves, Ctissue and Carterial, respectively. This can be approximated as the ratio of the HUtissue/HUarterial when the 2 curves approach steady state. A.A. Konstas et al. AJNR Am J Neuroradiol 2009;30:662-668 ©2009 by American Society of Neuroradiology