QUESTION $1$

Please put the following sonographic advancements in order of occurrance. Number One would respond to the first breakthrough, Number Seven the most recent technological addition to sonography.

Gray$-$scale imaging

B$-$Mode

M$-$Mode

A$-$Mode

$3-$D imaging

Real$-$time scanner

Doppler Revolution

A$.$ One

B$.$ Two

C$.$ Three

D$.$ Four

E$.$ Five

F$.$ Six

G$.$ Seven