They are much quicker now..thank God.
And smaller.
When I was building CAT Scans, they were huge beasts and the ‘computer’ (PDP-11, IIRC) took up a whole rack. Nowadays the cellphone in your hand has more computing power than it did.
The power supply took up another rack full of equipment all by itself...............
Also, the ‘hard drive’ was like the size of a microwave oven and the disk was the size of a 12 inch LP Record.
Once a scan was made you had to wait for a while for the computer to ‘develop’ a picture.............