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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
Examples of late effects of ionizing radiation on humans include
Leukemia, local tissue damage, malignant disease
Which of the following projections or positions will best demonstrate subacromial or subcoracoid dislocation?
PA oblique scapular Y
Which of the following positions is used to
demonstrate vertical patellar fractures and the patellofemoral articulation?
That ossified portion of a long bone where cartilage has been replaced by bone is known as the
Which of the following is most likely to permit the greatest decrease in patient exposure?
Changing from an 8:1 grid technique to nongrid
To demonstrate the mandibular body in the PA position,the
CR is directed perpendicular to the IR
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
What is the intensity of scattered radiation
perpendicular to and 1 m from a patient compared with the useful beam at the
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
A radiograph made with a parallel grid demonstrates decreased density on its lateral edges. This is most likely due to
The type of x-ray tube designed to turn on and off rapidly, providing multiple short, precise
With which of the following does the trapezium articulate?
When an image intensifier's magnification mode is used,
- resolution increases
- patient dose increases
If a radiograph exhibits insufficient density, this might be attributed to
- inadequate kVp
- grid cutoff
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
Which of the following could be used to improve recorded detail?
- Slower screen/film combination
- Smaller focal-spot size
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