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ch2728

ContrDens

QuestionAnswer
The density of the image easiest prime factor to evaluate, result of black metallic silver deposits, and the degree of overall blackening
The optical density visible to the human eye is 0.25- 2.50 OD
controlling factors should be used as the principle method for adjusting radiographic density.
The controlling factors of density mA, time, milliamperes, or mAs
As mAs decreases exposure decreases
The minimum change necessary to cause a visible shift in density 30% of mAs.
A single phase 2-pulse generator produces the least amount of radiographic density
high frequency generator produces the greatest amount of radiographic density
The 15% rule is used as a guide to the same density when kVp changes.
Both mA and time are the factors that influence the number of photons reaching the radiographic film. `
KVp is the factor the influences the average energy of the photons reaching the film.
The 15% rule changes both density and contrast
The relationship between exposure and SID SID is inversely proportional to the square of the distance.
The density maintenance formula mathematically resembles the Inverse square law.
The detail of a radiographic image is visible because of sufficient contrast and density.
Contrast is the difference between two adjacent densities
A radiograph with few shades of gray is said to exhibit high contrast
. A radiograph with low contrast provides the MOST information
The controlling factor of contrast is kVp
A radiograph that demonstrates considerable differences between densities is called short scale, increased contrast, and high contrast.
A radiograph that demonstrates minimal differences between densities is called long scale, low contrast, and decreased contrast.
A radiograph that demonstrates considerable differences between densities is called increased contrast.
A radiograph that demonstrates minimal differences between densities is called low contrast.
Image receptor contrast is expressed as the slope of the D log E curve
Contrast decreases with excessive density, inadequate densities, and a wider range of densities.
As the slope of the D log E curve increases the contrast increases
As kVp increases , a wider range of photoenergies is produced
Contrast increases with a decrease in kVp, field size, and part thickness. (Note: As scatter increases, contrast decreases
. High contrast is directly related to the number of photoelectric interactions, high kVp, and the amount of Compton scatter
A single-phase 2-pulse generator type results in the greatest decrease in contrast
Increasing the amount of irradiated tissue does not not increase contrast.
The concept of contrast as it is displayed on a soft-copy monitor for digital images is described as as dynamic range.
Created by: rose99
 

 



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