RECORDED DETAIL

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

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

Geometric Motion Screen 3 Types of Unsharpness Geometric Motion Screen

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

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

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

Control of Involuntary Motion Decrease Exposure Time

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

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

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

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

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

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

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

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