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Chapter 2

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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Question
Answer
The light collected and converted to an electrical signal by the photomultiplier tube (PMT) during CR image sampling is then sent to the _____ to be digitized.   show
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show Right  
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What is the location on a histogram graph of background values?   show
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show Center  
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What is the location on a histogram graph of contrast/metal?   show
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What is the location on a histogram graph of fat?   show
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What is the location on a histogram graph of soft tissue?   show
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show Motion  
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All of the following are guidelines for producing optimal image histograms except   show
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show Measure of dose to the patient  
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show halfway between S1 and S2  
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When is the examination or body part selected when using the DR system?   show
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show fog values outside the exposure field, but included in the VOI, do not cause widening of the histogram.  
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show window level adjustments change the contrast of the image.  
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show 1, 2, 3  
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show Overexposure of the IR  
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show Widen the histogram  
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Appropriate scatter radiation control methods include which of the following?   show
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Histogram analysis errors for all digital systems include all of the following except   show
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show phantom image  
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Which of the following statements are true? 1. the movement of an image histogram, left to right, will adjust image brightness. 3. changing the shape of the histogram will affect image contrast.   show
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n a cassette-less DR imaging system, 1. the correct examination is chosen before the exposure. 2. thin film transistors collect the electrical charge created in the LUT. 3. thin film transistors contain detector elements.   show
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If a projection does not differentiate the densest and thickest structures in the VOI, adjusting the _____ is necessitated.   show
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show 2 and 4 only  
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The anode heel affect 2. is a variation in photon intensity across the exposure field. 3. occurs because the heel of the anode absorbs photons.   show
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show 3 and 4 only  
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The amount of light produced in each pixel in the matrix is _____ to the amount of energy that was _____ in that area of the IP during the acquisition process.   show
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Best practice guidelines for the use of automatic exposure control include all of the following except   show
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Underexposed projections that require repeating are identified by which of the following: 1. quantum noise is present. 2. the VOI demonstrates a loss of contrast resolution. 3. The EI number indicated less than optimal exposure and no histogram   show
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Additive disease processes that would require at least a 35% increase in mAs include all of the following except   show
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show 1 and 2 only  
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show eight to 10 times  
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show 1, 2, 3, and 4  
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show Dense Bones  
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Which of the following patient conditions demonstrates low subject contrast?   show
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Which of the following patient conditions demonstrates low subject contrast?   show
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Which of the following patient conditions demonstrates low subject contrast?   show
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Which technical factor listed below is the primary controlling factor for exposure?   show
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show kVp  
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What percentage of kVp adjustment doubles the exposure?   show
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An AP abdomen projection was obtained using 85 kVp at 10 mAs. The resulting image demonstrated excessively low contrast, although the brightness was acceptable. What new technique could be used to obtain the projection with equal exposure but higher cont   show
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show -8% kVp  
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show +5-7 kVp or +50%-60% mAs  
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show +5 kVp or +25%-30%  
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show +50-75% mAs  
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What is the technical adjustment required with the patient condition of pleural effusion?   show
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What is the technical adjustment required with the postmortem image of the head, thorax, and abdomen?   show
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What is the technical adjustment required with soft tissue demonstration of foreign object?   show
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What is the technical adjustment required with the patient condition of osteoporosis?   show
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A PA chest projection was obtained using a grid with a recommended 40-inch focal range with a 72-inch SID. Where would the grid cutoff be demonstrated on the projection?   show
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