Ramming bubbles into blood vessels doesn’t sound healthy. But inject tiny bubbles into the narrowest veins and you can see previously invisible detail in an ultrasound image. To create this image, Kirsten Christensen-Jeffries and colleagues from King’s College London used standard ultrasound imaging to peer into the minute blood vessels in a mouse’s ear. They added bubbles as small as red blood cells – less than 10 micrometres across – to locate the veins more accurately than ever before.
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