Posts with the tag: ultrasound

Collimated ultrasound from an optical fibre

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Ultrasound is a safe and low-cost medical imaging tool which allows us to probe inside the human body without the risks associated with ionising radiation. The concept is simple: a transducer sends a pulse of ultrasound into the tissue, where it reflects and scatters off various structures and back to the transducer. The time taken for these echoes to return depends on the depth of the structure, and so timing the returning ultrasound allows the position of the scattering structures to be inferred. This provides what is known as an ‘A-scan’ – information along a single line going into the tissue. 2D or 3D images are then formed from multiple A-scans acquired as the ultrasonic beam is scanned in one or two directions.
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