ArticleJournal of ultrasound in medicine : official journal of the American Institute of Ultrasound in Medicine2025
Investigation of Phase-Change Droplets and Fast Imaging for Indicator Dilution Measurement of Flow.
Article in Journal of ultrasound in medicine : official journal of the American Institute of Ultrasound in Medicine, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
objectivesThe development of low boiling point liquid droplets as phase-change contrast agents allows for the local creation of microbubbles at a point of interest in vivo. Although there are many possible applications, few investigations have used selectively created microbubble boluses to measure volumetric flowrate. In this study, the flow ratio between two vessels is calculated by vaporizing droplets in each vessel individually.
methodsProof of principle is demonstrated in vitro by an imaging sequence that vaporizes droplets using a high mechanical index pulse, then images the transit of the resulting microbubbles at a high frame rate using low mechanical index plane waves.
resultsIt is shown that a linear relationship exists between the concentration of droplets and enhancement of the resulting microbubble bolus. In vitro flow is measured with a mean error of 8% in a 0.66 cm diameter vessel and with a mean error of 33% in a 0.49 cm diameter vessel. The relative volumetric flow between two adjacent vessels is calculated with a mean percentage error of 25% when imaging the region of droplet vaporization for flow ratios between 0.25 and 4.
conclusionsThis in vitro study demonstrates the feasibility of using a positive bolus tracer, induced by image-guided ultrasound excitation, to measure flow. Potential applications include measurement of the portal vein to hepatic artery flow ratio, known as the hepatic perfusion index.
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