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44 Cards in this Set

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