Overview on Radiographic Contrast & Density Flashcards
What is the measure of degree of film darkening?
Radiographic Density
What is the degree of density difference between two areas on a radiograph
Radiographic Contrast
What is the difference between those x-rays absorbed and those transmitted to the IR (image receptor)
Differential absorption
The radiographic image must meet certain requirements to be of any medical value, and although the standards are considerably higher today than they were at some point earlier in time
Radiographic Balance
Balance is the relationship between?
Contrast, Density and Sharpness
A balanced radiograph can have either what scale of contrast and can be either?
a short or long scale of contrast and can be light or dark
Does the amount of effort it takes to produce a radiographic image important?
No, It is of no importance if suitable radiographic contrast cannot be achieved
What produces visibility of detail?
The variations in density and contrast
What are the 2 Elements that make up radiographic contrast?
Subject Contrast and Film Contrast
What is the amount of differential absorption that has taken place among the various body structures lying in the path of the x-ray beam
Subject Contrast
The more pronounced/noticeable these absorption differences are,
The greater the subject contrast will be.
As subject contrast is increased, what happens to the radiographic contrast?
Radiographic Contrast will increase
It denotes the inherent sensitivity a given emulsion has to variations in the intensity of remanant photons striking its surface
Film Contrast
Why Different Film Contrasts are Used?
Harmony must exist between film and subject contrast before a good radiographic result can be gained
What is the responsibility of film contrast?
It is to help produce this optimum condition for the viewer.
