Diagnostic Quality Flashcards
Diagnostic Quality Image Provides
1.
2.
3.
Density
Contrast
Same size and shape of object being exposed
Degree of gradation of “blackness” on a film
Density
What effects density/visual characteristics
- Developing conditions (underdeveloped or overdeveloped films)
- mA
- kVp
Difference in densities seen on a film
Shades of gray in a radiograph
Film Contrast
contrast image shows few shades of gray between black and white (short-scale)
High contrast
image shows many shades of gray between black and white (long-scale)
Low Contrast
what has no effect on contrast
- mA or kVp
mA!!
What controls density
kvP and ma
Geometric Characteristic
1
2
3
Sharpness
Magnification
Image Shape Distortion
reproducing distinct outlines of an object
Sharpness
equal enlargement of radiographic image
Magnification
variation in the true size and shape of the object being radiographed
Image shape distoration
Image unsharpness can be minimized by keeping film as __ as possible to object and by having the source-film distance as long as possible
Source-Film Distance – Long
Object-Film Distance – Short
close