1. RECORDED DETAIL

2. Recorded detail refers to the sharpness or definition of the image.

3. Can you see the difference in detail
Can you see the difference in detail? The recorded detail or sharpness on the right side is much better

4. Geometric Motion Screen
3 Types of Unsharpness
Geometric
Motion
Screen

5. Geometric Unsharpness
To reduce geometric unsharpness:
increase SID
decrease OID
decrease focal spot size

6. 2 types of motion to consider voluntary involuntary
Motion Unsharpness
2 types of motion to consider
voluntary
involuntary

7. Control of Voluntary Motion
Explain procedure carefully to patient Suspend respiration If necessary, support body part with radiolucent sponge

8. Control of Involuntary Motion
Decrease Exposure Time

9. Decrease Exposure Time by:
Increase mA
Increase kVp
Increase speed of image receptor

10. Consider: Speed Film screen contact Radiographic noise/quantum mottle
Screen Unsharpness
Consider:
Speed
Film screen contact
Radiographic noise/quantum mottle

11. Film Screen Contact Results in a localized area of blurring
Use wire mesh screen test to rule out
If present, cassette should not be used

12. Increased screen speed = Increased screen unsharpness Increased unsharpness = Decreased recorded detail

13. Quantum Mottle
Also referred to as “radiographic “ noise because of its appearance similarity to electronic noise.

14. Reduce Quantum Mottle by Increasing Exposure time (This means you’ll need to lower either mA or kVp)

15. Digital Imaging Resolution Matrix size is the principle controlling factor Greater matrix size = greater detail

16. Other Factors Controlling Sharpness of Digital Images
Bandwidth
Scanning method
Filtering method