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As part thickness decreases, the kilovoltage ____________.
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If 200 mA has been selected for a particular exposure, what exposure time would be required to produce 20 mAs?
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RADT 465 Image Acq
ARRT registry review of Image Acquisition and Evaluation
| Question | Answer |
|---|---|
| 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) |
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lrcannon
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