Term
| An image is produced with a 200 speed intensitying screen using 35 mAs. The image is repeated with a 400 speed intensifying screen and the same density is achieved. What mAs was used for the second image? |
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Definition
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Term
| Ionization chamber AECs usually consist of a ____ chamber configuration. |
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Definition
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Term
| As SID increases, detail increases. |
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Definition
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Term
| A "slow" speed intensifying screen will capture more detail but require more mAs than a "fast" speed intensifying screen. |
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Definition
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Term
| Which of the following has a primary relationship with contrast? |
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Definition
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Term
| When an AEC is used for a PA chest, which ionization chambers are utilized? |
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Definition
| the left and right outer cells |
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Term
Of the following technique choices, which would demonstrate the greatest detail?
a. 70 kVp, 200 mA .04 seconds, 48" SID, small focal spot, 6:1 grid
b. 80 kvp, 100 mA, .08 seconds, 66" SID, small focal spot, 12:1 grid
c. 76 kVp, 50 mA, .16 seconds, 72" SID, small focal spot, 8:1 grid
d. 90 kVp, 400 mA, .025 seconds, 40" SID, large focal spot, no grid |
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Definition
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Term
| Anatomically programmed radiography (APR) exposure settings |
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Definition
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Term
| Which of the following does not have a primary relationship with detail? |
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Definition
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Term
| An image is repeated to lengthen the scale of contrast but keep the density the same. kVp is increased and the mAs is cut in half. This is an example of: |
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Definition
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Term
| Minor changes in kVp have a significant impact on detail. |
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Definition
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Term
| Which of the following exposure settings will yield an image with the shortest scale of contrast? |
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Definition
| 500 mA, 46 ms, 75 kVp 12:1 grid |
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Term
| Which of the following factors has the greatest impact on detail? |
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Definition
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Term
| When an AEC is used for a lateral chest, which ionization chambers are utilized? |
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Definition
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Term
| U.S. public law requires that generators automatically terminate AEC exposures at ____ mAs above 50 kVp. |
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Definition
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Term
| The anode heel effect is especialy evident on smaller anatomical structures, and small beam field sizes. |
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Definition
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Term
| When AEC systems are used, the selection of ____ is eliminated. |
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Definition
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Term
| Contemporary AEC systems work on the principle of x-rays... |
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Definition
| causing ionization of gases. |
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Term
| Which of the following is the correct mAs if 400 ms and 200 mA are selected? |
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Definition
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Term
| Selecting either a large or small focal spot, primarlily affects detail. |
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Definition
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Term
A radiographic examination has been taken using the following exposure conditions:
400 mA, 70 ms, 80 kVp, 1.2 mm fs, 200 speed screen, 12: grid, 44" SID
To increase the contrast, the most appropriate choice would be to |
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Definition
| switch to a 16:1 grid and increase mAs. |
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Term
| If an image is repeated with a higher grid ratio than before, the mAs must be decreased to maintain the same density. |
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Definition
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Term
| Which of the following would produce the greatest density? |
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Definition
| 200 mA, .08 sec, 40"SID, 90 kVp, 6:1 grid, 400 speed screen |
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Term
| Early versions of AEC technology were referred to as |
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Definition
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Term
| A common (though often innacurate) term used for AEC is |
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Definition
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Term
| A radiographer has received a request for an examination that requires a 12:1 grid based upon patient thickness. The exposure technique chart suggests a non-grid technique of 6 mAs at 90 kVp. The required mAs with the grid will be |
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Definition
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Term
| If a longer scale of contrast is the goal, which of the following actions is appropriate? |
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Definition
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Term
| The new mAs law, also known as the density maintenance formula, is used to determine the intensity of the beam (typically in mR) at a given distance from the source. |
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Definition
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Term
| An exposure is made at 40" SID using 40 mAs. The image is later repeated at 66" SID. Both images demonstrate the same density. What new mAs was used for the second exposure? |
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Definition
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Term
| A particular radiograph was produced using 8 mAs and 84 kVp with an 8:1 ratio grid. The image is to be repeated using a 16:1 ratio grid. What should be the new mAs? |
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Definition
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Term
| An exposure was made using 200 mA, 0.05 second exposure and 75 kVp. Each of the following changes will function to double radiographic image density, EXCEPT: |
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Definition
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Term
| The backup time of most AECs is set at ____ of the anticipated manual exposure time. |
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Definition
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Term
| What is the magnification factor if the OID is 4 inches and the SOD is 36 inches? |
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Definition
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Term
| As OID increases, so does magnification. |
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Definition
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