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Exam 11: The Prime Factors

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Question 21

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The relationship between mAs and exposure is

A) exponential.
B) directly proportional.
C) indirectly proportional.
D) a squared relationship.

E) A) and D)
F) B) and C)

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Question 22

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An acceptable radiograph was taken using 20 mAs at 70 kVp at a distance of 40 inches.A second radiograph is requested at 72 inches.What mAs should be used to produce this radiograph with a 72-inch distance?

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Question 23

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A radiograph is taken at 400 mA, 55 ms, 95 kVp.A second image could be taken to improve contrast at

If 1 ampere equals a flow of 6.3 * 10¹⁸ electrons per second, how many electrons flow from cathode to anode in 1 milliampere?

If 1 coulomb is equal to 6.3 *10¹⁸ electron charges, how many electrons flow from cathode to anode in 1 second?

As the mA doubles, the number of electrons flowing from cathode to anode

The reaction of a photographic film to light is equal to the product of the intensity of the light and the duration of the light exposure.This concept is known as

If kVp is doubled, the amount of x-ray photons created approximately increases

Given an exposure time of 0.15 second and a milliamperage of 100, calculate the mAs.

The product of tube current and exposure time is equal to

Increasing the kVp for an exposure will

Given 40 mA and an exposure time of 0.20 second, calculate the mAs.

An acceptable radiograph was taken using 12 mAs at 80 kVp at a distance of 72 inches.To reduce the image density by 50%, the new distance should be what?

A radiographer takes an initial radiograph using the technical factors of 50 mA at 0.46 sec.There is involuntary motion on the radiograph, but the radiographer wants to maintain radiographic film density.If the exposure time is reduced to 0.115 sec, what is the new mA?

The factors that affect x-ray emission under the direct control of the radiographer are called the ____ factors.

The density maintenance formula is a

An x-ray exposure of 100 mR is recorded at a distance of 40 inches.To reduce the exposure to 25 mR, to what will the distance need to be changed?

Given 25 mAs and a milliamperage of 100, calculate the exposure time.

Kilovoltage is the primary controlling factor of

The length of the exposure time (S) for a radiograph, is used to primarily control