Geometry + Radiographic Quality

Question 1

A larger _______ _______ _______ causes geometric unsharpness (penumbra)

Answer 1

Focal spot size

Question 2

A smaller focal spot size creates a ________ image

Answer 2

Sharper

Question 3

What are the three types of geometric distortion that effect the quality of a radiographic image

Answer 3

1. Magnification
2. Elongation
3. Foreshortening

Question 4

Type of geometric distortion where your image is larger when your subject is closer to your image receptor

Answer 4

Magnification

Question 5

Type of geometric distortion when the beam is not perpendicular to the receptor

Answer 5

Elongation

Question 6

When the beam is perpendicular to the receptor, they create 90 degree angles when they meet. If the beam or the receptor is angled they are no longer perpendicular. This creates what geometric distortion

Answer 6

Elongation

Question 7

The geometric distortion that occurs when the subject is not parallel to the receptor/ film

Answer 7

Foreshortening