| 摘要 |
Methods and apparatus are provided for controlling fluid flow or perfusion, wherein gas-filled microbubbles are used as ultrasound contrast-enhancing agents, and wherein the method comprises separating the removal of the contrast agent due to flow from the removal of the contrast agent due to bubble destruction for enhanced imaging processes. By varying exposure of the microbubbles to ultrasound, the method and apparatus apply the changes observed in the images to measure flow and vascularity, to improve visualization of blood flow and blood vessels, and to guide delivery of drugs locally to the site of imaging.
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