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What are the 4 prime factors of exposure in radiology?
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What is the unit used to indicate the total QUANTITY of x-rays in an exposure?
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exposures
Mod 1 Ch6
| Question | Answer |
|---|---|
| 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. |
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