Ch. 5: Flat-Panel Artifacts

Question 1

What are common flat-panel detector artifacts?

Answer 1

Dead pixels, incorrect gain calibration, image lag, and offset correction errors.

Question 2

What causes dead pixels?

Answer 2

Damage from dust, scratches, static discharge, or corrosion.

Question 3

What happens as the detector ages?

Answer 3

The number of dead pixels increases.

Question 4

How do manufacturers correct dead pixels?

Answer 4

Software identifies and fills in data from neighboring pixels.

Question 5

What does gain calibration correct?

Answer 5

Flaws or inconsistencies in detector response and connection.

Question 6

What is gain calibration also called?

Answer 6

Flat fielding.

Question 7

Why is gain calibration important?

Answer 7

To eliminate artifacts and ensure uniform image density.