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24 Cards in this Set
- Front
- Back
To ensure proper operation of the digital image display monitor, all of the following are important in order to develop a quality control (QC) program,except: |
Disassembly and cleaning of the internal monitor control devices by the QC technologis |
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Europium-activated barium fluorohalide is associated with |
PSP storage plates |
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The ability of an x-ray unit to produce constant radiation output, at a given mA, using various combinations of mAs and time is called |
linearity |
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Radiographs from a particular single-phase, full-wave-rectified x-ray unit were overexposed, using known correct exposures. A spinning-top test was performed at 200 mA, 0.05 s, and 70 kVp, and 8 dots were visualized on the finished film. Which of the following is indicated? |
The 0.05-s time station is inaccurate |
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In digital imaging, artifacts arise from a number of sources, including which of the following |
1.) Imaging hardware 2.) Image processing software 3.) Operator error artifacts |
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Congruence of the x-ray beam with the light field is tested using |
radiopaque objects |
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To compensate for variations in gain across a digital receptor, which of the following maintenance steps should be taken? |
Conduct a calibration correction for image nonuniformity |
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Radiographs from a particular three-phase, full-wave-rectified x-ray unit, made using known correct exposures, were underexposed. A synchronous spinning top test was performed using 200 mA, 1/12 second, and 70 kVp, and a 20° arc is observed on the test film. Which of the following is most likely the problem? |
The 1/12-second time station is inaccurate. |
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A device used to measure the luminance response and uniformity of monitors used in digital imaging is called a |
Photometer |
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All of the following are steps that should be used to accomplish quality control (QC) in digital radiography, except: |
Monitoring patient size to evaluate variations in equipment performance |
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The collimator light and actual irradiated area must be accurate to within what percentage of the SID? |
2% |
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Environmental background radiation can contribute to a |
Ghost artifact |
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A three-phase timer can be tested for accuracy using a synchronous spinning top. The resulting image looks like a |
solid arc, with the angle (in degrees) representative of the exposure time |
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Too much edge enhancement of the image in digital systems can cause an unwanted artifact called the: |
Halo effect artifact |
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Which of the following is (are) tested as part of a QC program? |
1.) Beam alignment 2.) Reproducibility 3.) Linearity |
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An exposed image plate will retain its original image quality for about |
8 hours |
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The x-ray beam and collimator light field must coincide to within |
2% of the SID |
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All of the following are daily quality control (QC) steps to ensure optimal diagnostic images on a digital display monitor, |
1.) Turn on the monitor and allow it to warm up 2.) Evaluate luminance, reflection, noise and glare 3.) Make sure that the monitor is dust-free on the viewing surface |
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All of the following are daily quality control (QC) steps to ensure optimal diagnostic images on a digital display monitor, except: |
Evaluate the QC patterns at the periphery and verify that all letters and numbers appear |
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To determine how quickly an x-ray tube will disperse its accumulated heat, the radiographer uses a(n |
anode cooling curve |
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Which of the following is (are) correct regarding care of protective leaded apparel? |
1.) Lead aprons should be fluoroscoped yearly to check for cracks. 2.) Lead gloves should be fluoroscoped yearly to check for cracks. 3.) Lead aprons should be hung on appropriate racks when not in use. |
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A quality-control (QC) program includes checks on which of the following radiographic equipment conditions? |
1.) Reproducibility 2.) Linearity 3.) Positive beam limitation/automatic collimation |
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device used to test the accuracy of the x-ray timer is the |
spinning top |
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A test pattern, such as the TG 18-CT test pattern, is used to qualitatively evaluate |
The luminance response of a digital display monitor |