Term
| All of the following are methods that can help to increase detail except: |
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Definition
| using a faster speed screen |
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Term
| Which of the following group of exposure settings would result in the greatest detail? (Hint: remember to look for the group of factors that would increase detail when compared to the rest). |
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Definition
| 100 speed screen, small focal spot, 72" SID |
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Term
| When working with a patient who has parkinsons disease and can't hold completely still, what course of action would you take to obtain the greatest detail? |
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Definition
| Use the shortest exposure time possible |
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Term
| In regards to voluntary motion, what is the best way to prevent it? |
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Definition
| Clear and effective communication with the patient prior to making the exposure. |
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Term
| Choose the set of exposure factors resulting in the greatest detail: |
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Definition
| 1" OID, 100 speed screens, 72" |
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Term
| Which would be most likely to result in decreased detail? |
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Definition
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Term
| Resolution (detail) is improved when: |
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Definition
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Term
| Choose the best answer to complete this sentence: Penumbra decreases as: |
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Definition
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Term
| Distortion is a misrepresentation of: |
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Definition
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Term
| For the majority of exams, proper alignment is achieved when the central ray is _______ to the part and _______ to the image receptor. |
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Definition
| perpendicular, perpendicular |
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Term
| Find the magnification factor if the SID is 40" and the SOD is 25" |
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Definition
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Term
| If the projected image size measures 3" and the magnification factor is 1.1, what is the actual object size? |
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Definition
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Term
| If an object measures 4" in diameter on the image, and is 2" from the image receptor (OID), what is the actual size of the object if the SID is 40"? (Hint: your first step is to find the SOD using what you've been given. You can find the SOD by subtracting the OID from the SID. You will also need to use both triangle formulas to solve this one.) |
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Definition
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Term
| Objects further from the image receptor are magnified |
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Definition
|
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Term
| Calculate the magnification factor if the SID is 72" and the OID is 2" (Hint: read this one carefully...you are given the SID and the OID, but you must find the SOD to find the magnification factor!) |
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Definition
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Term
Choose the following word combinations that makes the most sense for this statement:
If a patient/part is _________, then _______ will be somewhat reduced compared to a __________ patient/part. |
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Definition
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Term
| Improper tube angle/part relationship is most relevant to: |
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Definition
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Term
| Which of the following exams is an example of intentional distortion? |
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Definition
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Term
| If the CR is not centered on the anatomy appropriately, which of the following could result? |
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Definition
| The anatomy could be distorted (shape distortion) |
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Term
| Distance has a relationship with detail. |
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Definition
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Term
| Selecting the largest focal spot will give you the greatest detail. |
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Definition
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Term
You have a technique consisting of the following settings:
15 mAs, 70 kVp, 60" SID, 8:1 grid, 200 speed screen, 1.2mm (large) focal spot
Which of the following changes to this technique would have an affect on detail? |
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Definition
| Changing from a larger to a smaller focal spot size (from 1.2mm to .6mm) |
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Term
| Which of the following terms most accurately describes the result of not correctly aligning the x-ray beam angle with anatomic part? |
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Definition
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Term
| Slow speed intensifying screens, also known as "extremity" screens, result in less detail than "fast" screens. |
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Definition
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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
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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