Abstract
Both the sensitivity and the specificity of imaging techniques in the study of focal hepatic lesions are relatively low (33–66%) [1]; ultrasonography is no exception. Defining the region(s) of interest (ROI) is sometimes difficult with both conventional and color Doppler sonography. Thus, approaching the study of liver vessels and of the portal system may be difficult because venous flow is often slow, poor, deep, or within an organ with high US beam absorption because of associated diffuse hepatopathy. The Doppler system must be sensitive enough to detect even very slow flows: this has been partly achieved in the latest equipment which has just been, or will soon be, marketed. However, the necessary increase in gain may worsen image quality dramatically, making the image useless for diagnostic purposes, because of the thickness of the organ under examination. Moreover, respiratory artifacts and, in the segments near the great vessels of the heart, pulsatile artifacts are common [2, 3].
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Campani, R. et al. (1997). Clinical usefulness of color Doppler enhancement in the assessment of the liver and the portal system. In: Nanda, N.C., Schlief, R., Goldberg, B.B. (eds) Advances in Echo Imaging Using Contrast Enhancement. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5704-9_36
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DOI: https://doi.org/10.1007/978-94-011-5704-9_36
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