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44 Cards in this Set
- Front
- Back
What are the parameters that govern Image Quality?
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Recorded Detail
Optical Density Contrast Image Geometry |
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Which image quality parameter is determined by the amount of black metallic Ag in the emulsion. In digital radiography is the brightness level of the individual pixels?
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Optical Density
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Which image quality parameter is the difference between adjacent densities?
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Contrast
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Which image quality parameter is the accuracy of shape and size?
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Image geometry
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Which image quality parameter is illustrated here?
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Recorded detail
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What happens to the recorded detail when the Focal Spot Size increases?
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Recorded detail Decreases
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What happens to the recorded detail when the SFD (source film distance) increases?
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Recorded detail increases
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What happens to the recorded detail when the OFD (object film distance) increases?
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Recorded detail decreases
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What happens to the recorded detail when the Receptor Speed increases?
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Recorded detail Decreases
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What happens to the recorded detail when the Screen Speed increases?
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Recorded detail decreases
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What happens to the recorded detail when the motion increases?
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Recorded detail decreases
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Which image has the larger focal spot?
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On right
Larger Focal Spot size Decreases image detail |
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Which image is taken further away?
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On Right
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Which image uses a faster screen speed?
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Image on right
increased screen speed = decreased detail |
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Which image has the higher film/screen speed?
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on right
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What x-ray property is the degree of overall blackening of a film or brightness level of a pixel?
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Optical Density
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What does increasing the kVp do to the optical density?
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Increases density
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What does increasing the SID do to the optical density?
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Decreases Density
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What does increasing the Field Size do to the optical density?
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Increases Density
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What does increasing the Receptor Speed do to the optical density?
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Increases the density
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What does increasing the Screen Speed do to the optical density?
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Increases Density
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What does increasing the Object Thickness do to the optical density?
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Decreases density
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What does increasing the Film processing time/temp do to the optical density?
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Increases density
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Which image has a higher milliamperage?
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On right
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Which image has a higher exposure time?
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on right
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Which image has a higher Kilovoltage?
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on right
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What property is the difference between adjacent densities?
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Contrast
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What happens to the image quality when the Source Film Distance is increased?
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Recorded Detail Increases
Optical Density Decreases |
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What happens to an image when the Screen Speed is Increased?
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Recorded Detail Decreases
Optical Density Increases |
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What happens to the image quality when kVp is increased?
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Optical Density Increases
Contrast Decreases |
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What happens to the image quality when Field Size Increases?
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Optical Density Increases
Contrast Decreases |
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What happens to the image quality when Receptor Speed Increases?
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Optical Density Increases
Contrast Increases |
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What happens to the image quality when Receptor Speed Increases?
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Optical Density Increases
Contrast Increases |
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What happens to the image quality when Receptor Speed Increases?
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Optical Density Increases
Contrast Increases |
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What happens to the image quality when the Object Thickness Increases?
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Optical Density Decreases
Contrast Decreases |
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What happens to the image quality when the film processing time or temperature is Increased?
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Optical Density Increases
Contrast Increases |
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What happens to the image quality when Fogging Increases?
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Optical Density Increases
Contrast Decreases |
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What kind of inputs would decrease both Optical Density and Contrast?
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Increased Object Thickness
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What kind of inputs would increase both optical density & contrast?
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Increasing Film processing time/temp & Receptor Speed
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What inputs would increase optical density, but decrease contrast?
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Increased
kVp Field Size Fogging |
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Increasing what input would Increase recorded detail, but decrease optical density?
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Source Film Distance
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What has a larger radiation field size, Rectangular or Round Collimators?
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Rectangular, so less contrast & more optical density
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Aside from the slob rule, what is another way for object localization?
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Take an occlusal radiograph or Cone Beam CT
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What is Distortion attributed to?
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Misrepresentation of the size and shape of the object being examined due to:
SOF OFD Improper central ray/film alignment |