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image prod

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Term
Definition
show used by the anode cooling chart to tell the time needed for the anode to cool completely in order to continue making exposures  
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HU formula   show
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show single phase: 1 three phase 6 pulse: 1.35 3 phase 12/14 pulse: 1.41 high frequency: 1.41  
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total pixels in a matrix formula   show
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pixel size formula   show
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show contrast resolution  
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show 2n^2  
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show Full-size input phosphor diameter / Selected input phosphor diameter  
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What circumstances are most likely to lead to an increase in grid cutoff when using a parallel grid Inc in the exposure time Improper positioning of the grid Large SID Use of sm digital display devices Use of large-area image receptors   show
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show 4.0 %  
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show tissue density, tissue thickness, xray beam quality, atomic number  
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show 3cm, 2% variance  
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A radiograph is made using 40 milliampere seconds (mAs) at a 40-inch SID. If the image must be repeated at a 72-inch SID, what mAs value is necessary to maintain the same exposure Incorrect answer: 120 mAs Correct Answer: 130 mAs 12 mAs   show
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show  
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From the following, select the factor(s) that mAs affect in digital imaging Correct answer: patient dose Incorrect answer: contrast Selected Answer - Incorrect Incorrect answer: spatial resolution Selected Answer - Incorrect Correct   show
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show  
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show  
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The feature of the image intensifier that automatically adjusts kVp and mAs during fluoroscopy is the: automatic gain control. , Not Selected photocathode. , Not Selected electron-focusing lens. , Not Selected Incorrect answer: aut   show
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show  
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hen using automatic exposure control (AEC), the radiologic technologist can still select or change which factors Correct answer: Optical Density Correct answer: kVp Correct answer: Backup time Incorrect answer: mA Missed Option   show
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The measure of the imaging system’s ability to display the contrast of anatomic objects varying in size is the: Incorrect answer: spatial frequency. Correct Answer: modulation transfer function. modulation transfer function. , Not Select   show
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If the source to image distance is 150 cm, how much variance between the light field and the x-ray beam is acceptable Higher; larger , Not Selected Incorrect answer: Lower; smaller Correct Answer: Higher; smaller Higher; smaller ,   show
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show  
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voltage ripple   show
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show affects the energy and intensity of the X-ray beam. Lower voltage values during the cycle produce lower energy X-rays, some of which may be absorbed by the patient or have little diagnostic value  
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Single-phase:   show
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show Three-phase generators (6-pulse and 12-pulse) have lower ripple (around 13% and 4%, respectively) due to their smoother waveform  
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show These generators use inverters to produce a nearly constant DC waveform, minimizing ripple to less than 1%  
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show 100% ripple  
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show 14%  
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three phase twelve pulse   show
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high frequency   show
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show 5%  
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exposure indicator   show
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show How often the analog signal is digitized  
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show 6:1  
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