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29 Cards in this Set
- Front
- Back
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Density and time have what relationship?
a. Directly proportional b. Inversely proportional c. no relationship |
a. Directly proportional
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The exposure factor that should be used to control density is:
a. kVp b. SID c. mAs d. mA |
c. mAs
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mAs controls or influences which of the following:
1 density 2 contrast 3 recorded detail 4 distortion a. 1 and 4 b. 2 only c. 3 and 4 d. 1 only |
d. 1 only
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To reduce the chance of motion on a rdiograph, the radiographer shoud choose the lowest:
a. mA b. time c. mAs d. kVp |
b. time
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The factor that determines the total quantity of x-rays produced in a beam is the:
a. mA b. time c. mAs d. kVp |
c. mAs
(time + mA = mAs) |
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The length of the x-ray exposure is determined by the:
a. mA b. time c. mAs d. all of these |
b. time
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Time controls or influences which of the following?
1 density 2. contrast 3 recorded detail 4 distortion a. 1 and 4 b. 2 only c. 3 and 4 d. 1 only |
d. 1 only
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Density and mAs have what relationship?
a. directly proportional b. inversely proportional c. no relationship |
a. directly proportional
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mA stands for ___
which means ___ |
milliamperage
quantity of electrons |
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Increase in mA = ___ in quantity of x-rays = ____ in density
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Increase in quantity
Increase in density |
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Decrease in mA= ___ in quantity of x-rays = ___ in density
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Decrease in quantity
Decrease in Density |
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Time increased = ___ Density
Time decreased= ___ density |
Increased density
Decreased density |
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Convert 1/20 to a decimal.
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0.05
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Convert 2/6 to a decimal.
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0.33
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Convert 400ms to seconds
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.400sec
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Convert 10ms to seconds
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0.010sec
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If the mAs is decreased by 50%, the density will be decreased by:
a. 30% b. 50% c. 100% d. 200% |
b. 50%
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Which 2 sets of mA and time are an example of the reciprocity law?
1. 200mA 1/20sec 2. 400mA .03sec 3. 500mA .02sec 4. 600mA 50msec a. 1 and 3 b. 2 and 4 c. 1 and 4 d. 2 and 3 |
a. 1 and 3
200mA 1/20sec(.05sec) = 10 500mA .02sec = 10 |
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What is the formula for mAs?
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mA x time
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What is the Reciprocity Law?
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it is a variety of different mA and time settings, but they all produce the same mAs & therefore the same density.
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mA controls or influences which of the following?
1 density 2 contrast 3 recorded detail 4 distortion a. 1 & 4 b. 2 c. 3 & 4 d. 1 |
d. 1 only
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Which set of factors would produce a radiograph with the greatest density?
a. 400mA .10sec b. 200mA .30sec c. 500mA .01sec d. 600mA .025sec |
b. 200mA .30sec
=60mAs ^mAs=^density |
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Which set of factors would produce a radiograph with the least density?
a. 200mA 1/30sec b. 400mA 1/40sec c. 300mA 1/20sec d. 100mA 2/3sec |
a. 200mA 1/30sec (.033sec) = 6.6mAs
it was the least mAs = Least Density |
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Which set of factors would produce a radiograph with the greatest density?
a. 50mA 18msec b. 500mA 3msec c. 300mA 25msec d. 200mA 40msec |
d. 200mA 40msec (.040sec) = 8mAs
Greatest mAs = Greatest Density |
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Which one of these factors is the amount of current in the x-ray tube at the time of the exposure?
a. mA b. time c. mAs d. none |
a. mA
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changing from 200mA at .05sec to 200mA at .10sec will increase:
a. density b. contrast c. recorded detail d. distortion |
a. density
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Which one of these milliseconds I the same as 1/40sec?
a. 4 b. 12 c. 25 d. 40 |
c. 25 (0.025sec)
1/40=0.025sec |
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Which one of these techniques would be the best to control motion on a radiograph?
a. 100mA .05sec b. 200mA 1/40sec c. 500mA 10msec d. 50mA .10sec |
c. 500mA 10msec (.01sec)
lower time = less distortion |
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Which one of these would produce the best recorded detail on the radiograph?
a. 50mA 200msec b. 500mA .02sec c. 400mA 1/40sec d. 1000mA 10msec |
a. 50mA 200msec (0.2sec)
Greater time = Greater Recorded Detail |
