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Figure 5 Examples of time versus VI curves for the right ventricular and left ventricular cavities after bolus intravenous injection of lipid microbubbles with a net neutral charge polyetheleneglycol (MB_neutPEG⁺) (A) and lipid microbubbles with a net negative charge polyetheleneglycol (MB_negPEG^–) (B). See text for details. LV = left ventricular; RV = right ventricular.