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The interaction between x-ray photons and matter shown in Figure 3–1 is associated with
Total energy transfer from photon to electron
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Examples of late effects of ionizing radiation on humans include
Leukemia, local tissue damage, malignant disease
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Which of the following projections or positions will best demonstrate subacromial or subcoracoid dislocation?
PA oblique scapular Y
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Which of the following positions is used to
demonstrate vertical patellar fractures and the patellofemoral articulation?
Tangential patella
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That ossified portion of a long bone where cartilage has been replaced by bone is known as the
Metaphysic
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Which of the following is most likely to permit the greatest decrease in patient exposure?
Changing from an 8:1 grid technique to nongrid
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To demonstrate the mandibular body in the PA position,the
CR is directed perpendicular to the IR
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Any images obtained using dual x-ray absorptiometry (DXA) bone densitometry
are used to evaluate accuracy of the region of interest (ROI)
-
Types of secondary radiation barriers include
- The control booth
- Lead aprons
- The x-ray tube housing
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What is the intensity of scattered radiation
perpendicular to and 1 m from a patient compared with the useful beam at the
patient's surface?
0.1%
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The total number of x-ray photons produced at the target is contingent on the
- tube current
- target material
- square of the kilovoltage
-
The esophagus commences at about the level of
C6
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A radiograph made with a parallel grid demonstrates decreased density on its lateral edges. This is most likely due to
decreased SID
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The type of x-ray tube designed to turn on and off rapidly, providing multiple short, precise
exposures, is
grid-controlled
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With which of the following does the trapezium articulate?
First metacarpal
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When an image intensifier's magnification mode is used,
- resolution increases
- patient dose increases
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If a radiograph exhibits insufficient density, this might be attributed to
- inadequate kVp
- grid cutoff
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The effect described as differential absorption is
- Responsible for radiographic contrast
- A result of attenuating characteristics of tissue
- Minimized by the use of a high peak kilovoltage
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Which of the following could be used to improve recorded detail?
- Slower screen/film combination
- Smaller focal-spot size
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In radiography of a large abdomen, which of the following is (are) effective way(s) to minimize the amount of scattered radiation reaching the image receptor (IR)?
Use of close collimation
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