Radiographic Density and Contrast Flashcards
It is the degree of overall blackening on a radiographic image.
Density
It is the factor affecting the radiographic density.
milli ampere per seconds (mAs)
What is mAs?
It determines how many photons are produced by the x-ray tube
It is the difference between adjacent densities on a radiographic image.
Contrast
It is the factor affecting the radiographic contrast.
Kilovoltage (kVp)
It is the difference between adjacent densities on a radiographic image.
Contrast
What is kVp?
kVp determines how well a photon can penetrate to tissues because a high energy photon would pass through most structure easily while a low energy photon will be attenuated by many structures.
It is the controlling factor of density.
mAs
If mAs is doubled, the density will ___
If mAs is halved, the density will be ___
If mAs is doubled, the density will doubled
If mAs is halved, the density will be halved
It is the degree to which structure are black or white varies.
Contrast
Two types of Contrast
Long Scale Contrast and Short Scale Contrast
What is long scale contrast?
It has many shades of gray
Produced by use of high kVp
The advantage is the visualization of more structural detail
What is short scale contrast?
It has small amount of gray
Produced by use of low kVp
The advantage is more ideal to examine bone structure
It is the controlling factor of contrast.
kVp
It is produced by the development of exposed silver halide crystals in the emulsion.
Density
