Term
As the milliamperage-seconds are increased:
Select one:
a. X-ray quantity will increase proportionately
b. X-ray quality will increase proportionately
c. X-ray quantity will be greatly reduced
d. The optical density will decrease inversely |
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Definition
| a. X-ray quantity will increase proportionately |
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Term
All other factors remaining the same, if a 14 × 17-inch field is collimated to a 4-inch square field, the radiographic image will demonstrate
Select one:
a. less density.
b. less detail.
c. more density.
d. more detail. |
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Definition
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Term
The intensity of the x-ray beam is 60mR at 72". What is the intensity at 52"?
Select one:
a. 115mR
b. 31mR
c. 83mR
d. 43mR |
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Definition
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Term
The intensity of the x-ray beam at 40" is 30mR. What SID is needed to have the intensity of the beam to be 10mR?
Select one:
a. 69"
b. 13"
c. 120"
d. 23" |
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Definition
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Term
The amount of material needed to reduce an x-ray beam to one half its original intensity can be defined as:
Select one:
a. mAs = Distance formula
b. Half-life
c. The 50% rule
d. Half-value layer |
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Definition
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Term
An increase in the kilovoltage applied to the x-ray tube increases the
1. x-ray wavelength.
2. exposure rate.
3. patient absorption.
Select one:
a. 1 only
b. 2 only
c. 2 and 3 only
d. 1, 2, and 3 |
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Definition
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Term
An abdomen x-ray is taken at 500mA, .25 seconds, 70 kVp, and 40". What new mAs is needed at 48"?
Select one:
a. 240mAs
b. 180mAs
c. 87mAs
d. 150mAs |
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Definition
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Term
An increase in kVp would _____ the _____ of the emission spectrum.
Select one:
a. increase, position alone
b. increase, amplitude alone
c. increase, amplitude and position
d. not affect, amplitude and position |
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Definition
| c. increase, amplitude and position |
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Term
If technical factors of 70 kVp and 100 mAs were selected and if the time-setting was 250 milliseconds, the milliamperes must have been selected at:
Select one:
a. 400
b. 200
c. 1000
d. 800 |
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Definition
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Term
How is SID related to exposure rate and radiographic density?
Select one:
a. As SID increases, exposure rate increases and radiographic density increases.
b. As SID increases, exposure rate increases and radiographic density decreases.
c. As SID increases, exposure rate decreases and radiographic density decreases.
d. As SID increases, exposure rate decreases and radiographic density increases. |
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Definition
| c. As SID increases, exposure rate decreases and radiographic density decreases. |
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Term
A radiograph of the lumbar spine requires an exposure of 70 kVp and 320 mAs. If the radiographer selects the 500 mA station, what exposure time should be used?
Select one:
a. .72 second
b. .86 second
c. .55 second
d. .64 second |
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Definition
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Term
The factors that directly affect x-ray quantity are
Select one:
a. mAs.
b. distance.
c. filtration.
d. all of the above |
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Definition
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Term
As kVp increases, there is an increased production of:
Select one:
a. Long wavelengths
b. Short wavelengths
c. Electrons
d. Low-energy waves |
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Definition
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Term
The relationship between exposure and SID is
Select one:
a. directly proportional to the square of the distance.
b. inversely proportional.
c. directly proportional.
d. inversely proportional to the square of the distance. |
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Definition
| d. inversely proportional to the square of the distance. |
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Term
Decreasing the kVp will increase _____.
Select one:
a. patient dose
b. Compton scatter
c. optical density
d. image noise |
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Definition
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Term
An increase in mAs would _____ the _____ of the emission spectrum.
Select one:
a. increase, position alone
b. increase, amplitude alone
c. increase, amplitude and position
d. not affect, amplitude and position |
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Definition
| b. increase, amplitude alone |
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Term
What new exposure factors should be used to create a longer scale of contrast without altering the radiographic density if the original radiograph is produced using exposure factors of 300 mA, 1/10 second, and 60 kVp?
Select one:
a. 400 mA, 1/10 second, and 66 kVp
b. 300 mA, 1/20 second, and 70 kVp
c. 100 mA, 1/10 second, and 66 kVp
d. 600 mA, 1/20 second, and 70 kVp |
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Definition
| b. 300 mA, 1/20 second, and 70 kVp |
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Term
Kilovoltage is the primary controller of
Select one:
a. film density.
b. foreshortening.
c. elongation.
d. contrast. |
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Definition
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Term
An AP radiograph of a hip exhibiting optimal density was obtained using the exposure factors of 74 kVp, 100 mA at .40 seconds. It is necessary to repeat the radiograph to eliminate patient motion while maintaining density. Which of the following sets of exposure factors should be used?
Select one:
a. 74 kVp 500 mA .01 seconds
b. 74 kVp 400 mA .1 seconds
c. 74 kVp 300 mA .2 seconds
d. 74 kVp 200 mA .2 seconds |
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Definition
| b. 74 kVp 400 mA .1 seconds |
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Term
How can you improve image contrast with a heavy patient without increasing patient dose?
Select one:
a. Lower kVp and raise mAs.
b. Use tight collimation.
c. Raise kVp and lower mAs.
d. Do both A and B. |
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Definition
| b. Use tight collimation. |
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Term
An optimal radiograph of the elbow was turned in to the Radiologist. The technologist used 8mAs at 56kVp. The Radiologist suggested that the technologist be considerate of the patient’s exposure. What new technical factors could be used?
Select one:
a. 6 mAs and 70 kVp
b. 8 mAs and 66 kVp
c. 4 mAs and 66 kVp
d. 8 mAs and 60 kVp |
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Definition
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Term
A particular mAs, regardless of the combination of mA and time, will reproduce the same radiographic density. This is a statement of the
Select one:
a. inverse square law.
b. reciprocity law.
c. law of conservation of energy.
d. line focus principle. |
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Definition
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Term
Factor(s) that can be used to regulate radiographic density is (are)
1. milliamperage.
2. exposure time.
3. kilovoltage.
Select one:
a. 1 only
b. 2 only
c. 1 and 2 only
d. 1, 2, and 3 |
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Definition
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Term
A pediatric follow-up chest examination is ordered. Two days ago, another technologist radiographed the child supine at 40 SID. The following exposure factors were used:
SID-40 mAs-2 kVp-65
You choose to use a 72 SID and an erect position to obtain a diagnostic study. Your new mAs would be:
Select one:
a. 7
b. 3
c. 8
d. 12 |
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Definition
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Term
A Half-value Layer test is performed to determine the X-ray beams:
Select one:
a. mAs reproducibility characteristics
b. penetrability characteristics
c. resolution characteristics
d. rectification characteristics |
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Definition
| penetrability characteristics |
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Term
A 15% increase in kVp is equivalent to _____.
Select one:
a. increasing the mAs 15%
b. doubling the mAs
c. increasing the mAs 1 1/2 times
d. tripling the mAs |
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Definition
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Term
SID and density are governed by what law or rule?
Select one:
a. 15% rule
b. Inverse square law
d. Reciprocity law |
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Definition
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Term
X-ray intensity is measured in
Select one:
a. coulombs.
b. curies.
c. ohms.
d. roentgens. |
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Definition
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Term
Milliamperage-second directly affects each of the following except
Select one:
a. quantity.
b. quality. Correct
Correct
c. intensity.
d. x-ray output. |
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Definition
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Term
Which of the following affect(s) both the quantity and the quality of the primary beam?
1. Half-value layer (HVL)
2. kVp
3. mA
Select one:
a. 1 only
b. 2 only
c. 1 and 2 only
d. 1, 2, and 3 |
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Definition
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Term
Given an original technique of 10 mAs and 70 kVp, which of the following will produce a radiograph with double the density?
Select one:
a. 15 mAs, 82 kvp
b. 20 mAs, 70 kVp
c. 30 mAs, 92 kVp
d. 20 mAs, 80 kVp |
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Definition
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Term
A satisfactory radiograph of a pelvis is taken at 200 mA, ½ sec. and 70 kVp. If the distance is changed from 40 to 60 , what would be the nearest converted exposure time, in order to produce a film equal to the original density?
Select one:
a. 2/5 sec.
b. ¼ sec.
c. 1/8 sec.
d. 1 sec. |
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Definition
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Term
How are mAs and radiographic density related in the process of image formation?
Select one:
a. mAs and radiographic density are related to image unsharpness.
b. mAs and radiographic density are unrelated.
c. mAs and radiographic density are inversely proportional.
d. mAs and radiographic density are directly proportional. |
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Definition
| d. mAs and radiographic density are directly proportional. |
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Term
The inverse square law applies to:
Select one:
a. all techniques that use intensifying screens
b. all techniques that use nonscreen film
c. the size of the effective focal spot
d. all techniques that involve a change in distance |
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Definition
| d. all techniques that involve a change in distance |
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Term
All of the following affect the exposure rate of the primary beam except
Select one:
a. field size.
b. distance.
c. kVp.
d. mA. |
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Definition
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