Chapter 2
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| show | ADC (analog-to-digital converter)
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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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| show | Left
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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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| At what level is the exposure indicator reading taken on the VOI? | show 🗑
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| show | Before the radiation exposure
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| All of the following are true about histogram analysis errors except | show 🗑
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| All of the following are true about windowing except | show 🗑
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| An exposure recognition field algorithm is applied to the image data to | show 🗑
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| Saturation indicates | show 🗑
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| If the image histogram is wider than the LUT’s histogram, all of the following are true except the algorithm would (choose the false statement) | show 🗑
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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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| show | 1 and 3 only
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| 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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| Exposure indicators 1. are used to create the histogram. 2. denote the quantity of photons that strike the IR. 3. are used to determine dose to the patient. 4. vary from one manufacturer to another. | show 🗑
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| show | 2 and 3 only
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| Technical considerations when imaging obese patients include all of the following except: 3. mAs should be doubled for every 2 cm of added tissue. 4. kV should be increased by 2 for every 2 cm of added tissue. | show 🗑
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| show | equivalent; stored
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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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| show | Paget's Disease
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| show | 1 and 2 only
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| Total saturation is seen when _____ the ideal IR exposure is reached. | show 🗑
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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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| show | mAs
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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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| show | +35% mAs
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| show | +35%-50% mAs
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| show | –15-20% kVp
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| What is the technical adjustment required with the patient condition of osteoporosis? | show 🗑
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| show |
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