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chapter 7,8,9,10

week 4

What is Distortion A variation in the size or shape of the image as compared with the subject it represents.
Can we eliminate distortion? No, not completely. Every image has some distortion, every object has some size and shape distortion.
What effects size distortion? 1. SID 2. OID
What is shape Distortion? Unequal Magnification of the actual shape of the structure being examined.
What are the prime factors of radiographic exposure? mA, exposure time, kVp, SID
The unit used to indicate the total quantity of X-rays in an exposure. mAs
What is the formula for determining mAs? mA x Time(seconds)= mAs
Name the factors that will result in increased radiographic density. Increased mA, Increased exposure time, and increased kVp
Define Radiographic Density. The overall blackness or darkness of the radiograph.
Density is primarily controlled by varying what? mAs
Define Radiographic Contrast. The difference in density between adjacent portions of the image
Contrast is primarily controlled by altering what? kilovoltage
What is the definition of radiographic fog? Generalized unwanted exposure on the image.
What is another name for size distortion? Magnification
If a radiographic image appears blurred, due to motion, which exposure factor should be used to correct the problem? Decrease in exposure time (seconds)
What is the effect of magnification on recorded detail? Magnification DECREASES recorded detail.
When there is a significant OID that can not be minimized by positioning, what can be done to improve image quality? Increase the SID
The distance between the subject, or part, and the IR is referred to as what? OID
Created by: Debra.Agee