EXAMPLE OF SPEED ERROR
Two pins in a test object are 100 mm apart. On the display of an ultrasound system, they appear 90 mm apart. How will these two pins appear on the display if they were 50 mm apart in the test object?
The two pins will appear 45 mm apart: the ultrasound system underestimates true distances by 10%, so 100 mm is displayed as 90 mm. Thus, 50 mm will be underreported by 10% and the pins will appear 45 mm apart on the display.