1. Quality of the radiographic image
Contrast
Image geometry
Characteristics of the x-ray beam
Image sharpness and resolution

2. Perception of the radiographic image
Partial images-we all see the same partial images but we don’t necessarily perceive the same object
Contrast
Context

3. Effect of partial image

4. The effect of contrast

5. The effect of context

6. Image geometry Positioning of the film, object and x-ray beam
Focal spot size and principle of line focus
Focal spot-object distance (FSOD), object-
to film-distance (OFD)

7. Ideal image geometry requirements

8. Focal spot size, heat distribution and image sharpness
Focal spot 1mm
Heat needs to be distributed over as large
as possible area
Principle of line focus

12. Focal spot-to film-distance(FSFD)

13. FSFD Increasing the distance between the focal
spot and the object results in an image
with increased sharpness and less
magnification of the object

14. Object-to film- distance (OFD)

15. Decreasing the distance between the
object and the film increases the
sharpness and result in less magnification
of the object

16. Image shape distortion

17. Cont’d

18. Bisecting angle technique-shape distortion

21. Cont’d