week 4
Help!
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| What is Distortion | A variation in the size or shape of the image as compared with the subject it represents.
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| Can we eliminate distortion? | No, not completely. Every image has some distortion, every object has some size and shape distortion.
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| What effects size distortion? | 1. SID
2. OID
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| What is shape Distortion? | Unequal Magnification of the actual shape of the structure being examined.
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| What are the prime factors of radiographic exposure? | mA, exposure time, kVp, SID
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| The unit used to indicate the total quantity of X-rays in an exposure. | mAs
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| What is the formula for determining mAs? | mA x Time(seconds)= mAs
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| Name the factors that will result in increased radiographic density. | Increased mA, Increased exposure time, and increased kVp
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| Define Radiographic Density. | The overall blackness or darkness of the radiograph.
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| Density is primarily controlled by varying what? | mAs
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| Define Radiographic Contrast. | The difference in density between adjacent portions of the image
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| Contrast is primarily controlled by altering what? | kilovoltage
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| What is the definition of radiographic fog? | Generalized unwanted exposure on the image.
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| What is another name for size distortion? | Magnification
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| If a radiographic image appears blurred, due to motion, which exposure factor should be used to correct the problem? | Decrease in exposure time (seconds)
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| What is the effect of magnification on recorded detail? | Magnification DECREASES recorded detail.
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| When there is a significant OID that can not be minimized by positioning, what can be done to improve image quality? | Increase the SID
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| The distance between the subject, or part, and the IR is referred to as what? | OID
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Created by:
Debra.Agee
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