Definition of A-scan in English:

A-scan

Pronunciation /ˈeɪskan/

noun

  • A radar or ultrasound scan in which the echo signals are used to generate a linear trace on an oscilloscope screen, the height of a peak being proportional to the strength of the echo; an image obtained by such a scan.

Origin

1940s; earliest use found in British Patents. From A + scan, probably originally with reference to A as the first of a set, although later often reinterpreted as showing the initial letter of amplitude.