Ascans
Ascans, often written as A-scans, refer to one-dimensional depth profiles obtained by scanning techniques that plot signal amplitude as a function of depth or time. The term is used across several disciplines to describe a foundational depth-measuring trace, typically produced by pulsed ultrasound or similar time-domain methods. An A-scan highlights interfaces within a medium as peaks in the trace, enabling estimation of distances or layer thicknesses when sound velocity is known.
In ophthalmology, A-scan ultrasound biometry employs high-frequency sound waves to measure the axial length of the
Beyond ophthalmology, A-scans are used in dental imaging, industrial non-destructive testing, and materials science to assess
Terminology varies by field; the plural Ascans is commonly used informally to refer to multiple A-scan traces.