ARRT registry review covering image production content area
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| 1. What does window level adjust? (pg 314) | show 🗑
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| 2. What refers to the various body tissue densities and thicknesses? (pg 314) | show 🗑
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| show | False
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| 4. According to what law does exposure rate decrease when SID is increased? (pg 315) | show 🗑
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| show | an increase in mAs
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| show | quality and quantity (energy/wavelength)
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| show | 15% rule
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| 8. What 3 factors determine scatter radiation production? (pg 318) | show 🗑
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| show | collimation
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| 10. What is a device that is used between the patient and IR that functions as absorption of scatter before it reaches the IR? (pg 321) | show 🗑
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| 11. When should grids be used? (pg 321) | show 🗑
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| show | increase mAs
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| show | False
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| 14. True or False: your tube and grid should be parallel to each other (pg 323) | show 🗑
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| 15. What type of grid error has occurred if there is a loss of exposure at the periphery of the IR? (pg 324) | show 🗑
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| show | off-center
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| 17. True or False: grid cutoff will not occur if you place your grid upside down (pg 324) | show 🗑
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| 18. What is the height of the lead strips compared with the distance between them? (pg 325) | show 🗑
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| show | 2.5 mm Al (glass envelope 0.5 mm, collimator 1.0 mm, added 1.0 mm)
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| 20. What is the purpose of filtration? (pg 328) | show 🗑
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| 21. True or False: filtration has no impact on contrast (pg 328) | show 🗑
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| 22. Destructive pathologic conditions include: (pg 331) | show 🗑
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| show | ascites, rheumatoid arthritis, paget's disease, pnuemonia, atelectasis, congestive heart failure, and edematous tissue
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| 24. When using the anode heel affect, which side does the thicker part of the pt go under? (pg 332) | show 🗑
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| show | bit
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| show | pixel
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| show | bit depth
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| 28. What is the graphic representation of pixel value distribution? (pg 334) | show 🗑
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| show | voxel
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| show | the shades of grey
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| show | visibility
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| 32. What is defined as how easily we are able to recognize those details? (pg 336) | show 🗑
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| show | under the table, above the IR and as photons emerge from the pt they enter the chamber and ionize the air within
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| show | under the IR and exit radiation from the pt interacts with and exits the IR and emits light and charges the photomultiplier tube
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| show | OID, SID, focal spot size, distortion, patient shape/position, and motion
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| 36. Contrast resolution is measured in (handout) | show 🗑
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| 37. What is an adjustment of pixel values to pre-set range of values to produce consistent brightness and grayscale called? (handout) | show 🗑
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| show | Dead pixel correction
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| show | Edge enhancement
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| 40. What is the removal of darkest to lightest pixel value from greyscale called? (handout) | show 🗑
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| show | smoothing
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| 42. What is defined as stored histogram values of selected exams? (handout) | show 🗑
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| show | masking
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| 44. What is defined as using grid lines from a special wire alignment grid to align multiple images into one? (handout) | show 🗑
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| show | dynamic range compression
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| 46. True or False: masking should not be used to collimate anatomy that should not haven been captured | show 🗑
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| 47. What is it called when you even out pixel values across an entire image for consistent brightness? (handout) | show 🗑
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| 48. As DQE increases, what happens to patient dose? (handout) | show 🗑
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| 49. What is the numeric value that represents the amount of exposure the IR receives? (handout) | show 🗑
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| show | fixed: specifies a particular Kv for adequate penetrating and requires a change in mAs based upon patient size and condition.
variable: mAs is fixed and Kv is increases as part thickness increases.
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