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RADT 465 Image Acq

ARRT registry review of Image Acquisition and Evaluation

QuestionAnswer
As part thickness decreases, the kilovoltage ____________. Decreases. (Lange Q&A pg. 236)
If 200 mA has been selected for a particular exposure, what exposure time would be required to produce 20 mAs? 10 secs. (Lange Q&A pg. 216)
If insufficient backup time has been selected for AEC, the image would be _________. Underexposed (Lange Q&A pg. 235)
What happens to the part being imaged when the FOV is decreased? It is less magnified. (Lange Q&A pg. 242)
Name 2 ways to decrease motion, which improves recorded detail. Short exposure time, careful patient instruction, adequate immobilization. (Lange Q&A pg. 273)
How should boxes of film be stored? Vertical, or upright, to avoid pressure marks. (Lange Q&A pg. 236)
What does a histogram represent? A graphic representation of pixel value distribution. (Lange Q&A pg. 247)
The term used to describe the IR's impact on recorded detail in CR/DR is _____________. Spatial resolution. (Radiography Prep Book pg. 299)
What does PACS stand for? Picture archiving and communication systems (Radiography Prep Book pg. 354)
If a chest x-ray is taken with an mA of 100 and the radiologist wanted it repeated with an mA of 200, what would happen to the density of the image? It would be increased. (Radiographic Exposure Principles & Practice pg. 182)
It an image was taken with 85 kVp and it is repeated with a kVp of 75, what would happen to distortion? There would be no change. (Radiographic Exposure Principles & Practice pg. 182)
An image was taken with a focal spot size of .3-mm and for the next image it was taken with a focal spot size of .5-mm. What effect does this have on recorded detail? It would be decreased. (Radiographic Exposure Principles & Practice pg. 182)
A foot x-ray was taken on an 8x10 collimation field size and on the next image was taken on a n 11x14 collimation field size. What effect does this have on contrast? It would be decreased. (Radiographic Exposure Principles & Practice pg. 182)
What effect does OID have on contrast if it is decreased? Contrast would be decreased. (Radiographic Exposure Principles & Practice pg. 183)
What effect does developer temperature have on density if the temperature is decreased? Contrast would be decreased. (Radiographic Exposure Principles & Practice pg. 183)
What effect does grid ratio have on recorded detail is the grid ratio is increased? Recorded detail would have no change. (Radiographic Exposure Principles & Practice pg. 182)
What effect does filtration have on distortion if filtration is decreased? Distortion would have no change. (Radiographic Exposure Principles & Practice pg. 183)
What 5 factors, if increased, would have an effect on density? mA, time, mAs, kVp, and collimation field size.(Radiographic Exposure Principles & Practice pg. 182)
What two factor have an effect on distortion? SID and OID. (Radiographic Exposure Principles & Practice pg. 182)
What is the definition of a variable kV technique chart? The mAs is fixed and the kV is increased as part thickness increases. (Radiography Prep book pg. 351)
What are some examples of involuntary motion? Perstaltic activity, muscle spasms, and heart action. (Radiography Prep book pg. 309)
What is the best way to minimize involuntary motion? By using the shortest possible exposure time. (Radiography Prep Book pg. 309)
Why do we use phosphors with high atomic numbers? Because they react to x-ray photons more efficiently and possess greater speed. (Radiography Prep Book pg. 312)
The more fluorescent light each phosphor emits, the _________ its Conversion Efficiency (CE) and speed. Greater. (Radiography Prep Book pg. 312)
What is the inverse square equation? Intensity (1) divided by Intensity (2) equals the squared distance (2) divided by the squared distance (1). (Radiography Prep Book pg. 319)
What is the density maintenance formula? mAs (1) divided by mAs (2) equals the squared distance (1) divided by the squared distance (2). (Radiography Prep Book pg. 319)
What is an example of a stationary grid? A grid cassette. (Radiography Prep Book pg. 323)
What does filtration do? Reduces patient skin dose and increases overall average energy of the x-ray beam. (Radiography Prep Book pg. 330)
What is a compensating filter used for? It is used for anatomic parts having very different thickness/absorption properties. It is also used to "balance" tissue densities and improves visualization of all tissues. (Radiography Prep Book pg. 330)
When is the Anode Heel Effect most emphasized? At short SIDs, with large size image receptors, and with small anode angle x-ray tubes. (Radiography Prep Book pg. 336)
Created by: lrcannon