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exposures

Mod 1 Ch6

QuestionAnswer
What are the 4 prime factors of exposure in radiology? Milliamperage(mA), Exposure time(sec), Kilovoltage(Kvp), Distance(SID)
What is the unit used to indicate the total QUANTITY of x-rays in an exposure? mAs
What can result in increased radiographic density? Increased mA, Increased exposure time, Increased kVp
If a image is overexposed, what changes in exposure factors should be used to correct the problem? decrease the mAs, usually with exposure time
The distance between the tube target and the IR is termed? SID
The relationship between SID and beam intensity is expressed in which law? Inverse square law
The inverse square law states? the intensity of the x-ray beam is inversely proportional to the square of the distance
What are the 4 primary aspects of radiographic quality? Density, Contrast, Distortion, Recorded detail
Define radiographic density? overall blackness or darkness.
Density is primarily controlled by varying? mAs
Define radiographic contrast? difference of density between adjacent portions of an image.
Contrast is primarily controlled by alternating? Kvp
when an image demonstrates considerable differences between the densities of adjacent areas on the film, it has? high contrast.
when an image shows very few densities with large differences between the adjacent areas on the film, it has? low contrast.
A low Kvp setting produces an image with? short scale contrast.
A high Kvp setting produces an image with? Long scale contrast.
Generalized unwanted exposure on the image is called? Fog
Fog affects radiographic quality by causing? decreased contrast
Define distortion? difference between the actual subject and its radiograqphic image.
Another name for size distortion is? Magnification
The distance between the subject or the part and the IR is referred to as? OID
The unsharp, "fuzzy" appearance of the margins (edges) of structures within the radiographic image is called? Pnumbra
A change from the small focal spot to the large focal spot will result in? Increased pnumbra, decreased recorded detail.
An increase in OID will result in? size distortion, magnification.
With a large OID, the reduction of excessive magnification is accomplished by? increasing SID
Motion of the patient, the tube, or the IR during the exposure will result in? Blurring
Define Quantum Mottle? when grainy or mottled (spots) image is created
how does the x-ray tech minimize shape distortion? angle the tube or angle the patient.
list 3 ways to increase recorded detail? decrease focal spot, decrease OID, increase SID.
Which quality factor is a key to visibility of detail? proper density
What is the effect of magnification on recorded detail? Distortion, magnification.
Created by: 100000560725058