Mod 1 Ch6
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| What are the 4 prime factors of exposure in radiology? | Milliamperage(mA), Exposure time(sec), Kilovoltage(Kvp), Distance(SID)
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| What is the unit used to indicate the total QUANTITY of x-rays in an exposure? | mAs
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| What can result in increased radiographic density? | Increased mA, Increased exposure time, Increased kVp
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| If a image is overexposed, what changes in exposure factors should be used to correct the problem? | decrease the mAs, usually with exposure time
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| The distance between the tube target and the IR is termed? | SID
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| The relationship between SID and beam intensity is expressed in which law? | Inverse square law
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| The inverse square law states? | the intensity of the x-ray beam is inversely proportional to the square of the distance
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| What are the 4 primary aspects of radiographic quality? | Density, Contrast, Distortion, Recorded detail
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| Define radiographic density? | overall blackness or darkness.
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| Density is primarily controlled by varying? | mAs
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| Define radiographic contrast? | difference of density between adjacent portions of an image.
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| Contrast is primarily controlled by alternating? | Kvp
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| when an image demonstrates considerable differences between the densities of adjacent areas on the film, it has? | high contrast.
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| when an image shows very few densities with large differences between the adjacent areas on the film, it has? | low contrast.
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| A low Kvp setting produces an image with? | short scale contrast.
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| A high Kvp setting produces an image with? | Long scale contrast.
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| Generalized unwanted exposure on the image is called? | Fog
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| Fog affects radiographic quality by causing? | decreased contrast
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| Define distortion? | difference between the actual subject and its radiograqphic image.
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| Another name for size distortion is? | Magnification
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| The distance between the subject or the part and the IR is referred to as? | OID
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| The unsharp, "fuzzy" appearance of the margins (edges) of structures within the radiographic image is called? | Pnumbra
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| A change from the small focal spot to the large focal spot will result in? | Increased pnumbra, decreased recorded detail.
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| An increase in OID will result in? | size distortion, magnification.
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| With a large OID, the reduction of excessive magnification is accomplished by? | increasing SID
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| Motion of the patient, the tube, or the IR during the exposure will result in? | Blurring
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| Define Quantum Mottle? | when grainy or mottled (spots) image is created
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| how does the x-ray tech minimize shape distortion? | angle the tube or angle the patient.
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| list 3 ways to increase recorded detail? | decrease focal spot, decrease OID, increase SID.
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| Which quality factor is a key to visibility of detail? | proper density
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| What is the effect of magnification on recorded detail? | Distortion, magnification.
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