Chapter 4 Flashcards
Latent image
Unseen image
On detector
Manifest image
Seen image
On the monitor
Image brightness or density
Visibility of image
Contrast
Visibility of image
Spatial resolution
Sharpness of the image
Distortion
Sharpness of the image
What is Density or brightness
The overall amount of blackness on a radiograph
Controlled by mAs
Direct relationship
Relationship for density
All direct for
mA
Time
mAs
Brightness relationship
mA is inverse
What is brightness
The amount of luminance of a display monitor, each pixel will display a different level of brightness
Increased brightness =
Decreased density and decrease in mAs
Decreased brightness =
Increase in density and increase in mAs
What is the relationship with brightness and density
Inverse
Brightness and mAs have what kind of effect
Indirect
What is mAs
The quantity of photons created
Telling is how hot to burn mA
About of time it burns s
Direct relationship
Controlling factor for brightness and density
Must have minimum of 30% increase or decrease to change radiograph
Contrast is
White grey or black pixels
High contrast =
Black white few shades of grey
Low contrast =
Many shades of grey
The human body is not
Homogeneous
