Intraarterial Contrast-Enhanced Ultrasonography Is the Final Goal of Intravenous Contrast-Enhanced Ultrasonography
Contrast-enhanced ultrasonography (US) falls into two broad categories: intraarterial and intravenous (Table 1–1). Intraarterial techniques use CO2 microbubbles as the contrast agent, whereas intravenous techniques use Levovist (300 mg/ml), the only contrast agent currently marketed in Japan. Intravenous contrast-enhanced US can be further classified into contrast-enhanced Doppler and contrastenhanced harmonic techniques. The former utilizes fundamental wave color Doppler or power Doppler. The latter utilizes harmonics, and can be either harmonic color or power Doppler, or harmonic B-mode. Because different types of equipment perform differently, the selection of techniques is currently based on equipment availability.1
KeywordsFocal Nodular Hyperplasia Conventional Angiography Equipment Availability Surrounding Liver Parenchyma Contrast Harmonic Image
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