Chapter 12 Flashcards
The factors that affect x-ray emission under the direct control of the radiographer are called the ____ factors.
a. quality
b. quantity
c. prime
d. principal
prime
The prime factors include all of the following EXCEPT
a. filtration.
b. mAs.
c. kVp.
d. distance.
filtration
Milliamperage-second (mAs) directly affects all of the following EXCEPT
a. beam quantity.
b. beam intensity.
c. beam quality.
d. x-ray output.
beam quality
The factors that directly affect x-ray quantity are
a. mA.
b. time (S).
c. filtration.
d. both a and b.
both a and b
Total x-ray beam quality is numerically represented by the
a. kEv.
b. SOD.
c. mAs.
d. HVL.
HVL
The factors that directly affect x-ray quality are
a. kVp and beam filtration.
b. mAs and distance.
c. filtration and mAs.
d. focal spot size and anode angle.
kVp and beam filtration
Using digital detector technology, the term used to express exposure to the detector is
a. mR/mAs
b. exposure index(EI)
c. QDE
d. IRE
exposure index (EI)
Select the TRUE statement regarding digital imaging, from the choices below.
a. Digital detectors will compensate for errors in mAs selection
b. Exposure index numbers are consistent between manufacturers
c. The brightness on a review monitor is not related to x-ray exposure
d. Digital technology has eliminated repeat images due to errors in exposure selection
The brightness on a review monitor is not related to x-ray exposure
As the mA doubles, the number of electrons flowing from cathode to anode
a. increases fourfold.
b. increases twofold.
c. decreases twofold.
d. increases by 50 percent.
increased twofold
The product of tube current and exposure time is equal to
a. kVp.
b. x-ray beam quality.
c. x-ray beam quantity.
d. the HVL.
x-ray beam quantity
The primary factor controlling x-ray beam quantity is determined by
a. mAs.
b. kVp.
c. distance.
d. filtration.
mAs
In order to increase image receptor (IR) exposure by 40 percent, the radiographer would
a. change the mAs from 15 to 21 mAs.
b. decrease the kVp by 40 percent.
c. increase the mAs by 20 percent.
d. decrease the distance by 40 percent.
change the mAs from 15 to 21 mAs
In order to increase image receptor (IR) exposure by 40 percent, the radiographer would
a. change the mAs from 15 to 21 mAs.
b. decrease the kVp by 40 percent.
c. increase the mAs by 20 percent.
d. decrease the distance by 40 percent.
change the mAs from 15 to 21 mAs
If the mAs of a radiograph is increased from 10 to 20, the result will be
a. an increase in the EI number from 125 to 250.
b. no change in the EI number.
c. an increase in the EI number from 125 to 135.
d. a decrease in patient exposure.
an increase in the EI number from 125 to 250
The relationship between mAs and exposure is
a. exponential.
b. directly proportional.
c. indirectly proportional.
d. a squared relationship.
directly proportional
Exposure indicators used in digital imaging have a direct or indirect relationship with exposure, depending upon the manufacturer. If the digital system you are using has an indirect relationship with exposure, your exposure reference value (S#) will
a. increase with increased exposure.
b. decrease with increased exposure.
c. be unaffected by changes in mAs.
d. will not change with an increase in kVp.
decrease with increased exposure
Increasing the kVp for an exposure will
a. create a decrease in the number of electrons traveling from cathode to anode.
b. decrease the speed of electrons going from cathode to anode.
c. create an increase in the number of electrons traveling from cathode to anode.
d. cause the electrons to travel faster from cathode to anode.
cause the electrons to travel faster from cathode to anode
Increasing the energy of an incident electron will result in the production of an x-ray photon with
a. greater energy.
b. less energy.
c. greater charge.
d. greater velocity.
greater energy
If kVp is doubled, the amount of x-ray photons created approximately increases
a. twofold.
b. threefold.
c. fourfold.
d. eightfold.
fourfold
Kilovoltage is the primary controlling factor of
a. x-ray beam quantity.
b. filtration thickness.
c. x-ray beam quality.
d. x-ray beam intensity.
x-ray beam quality
An increase in kVp by 15 percent will cause an approximate ____ in the exposure to the receptor.
a. 15 percent increase
b. tripling
c. doubling
d. quadrupling
doubling
Adjustments in mAs should be used to control IR
a. resolution.
b. contrast.
c. exposure.
d. window level.
exposure
X-ray beam penetrability is primarily controlled by
a. mAs.
b. focal spot size and dimension.
c. kVp.
d. filtration.
kVp
The relationship between the intensity of radiation and distance is the
a. reciprocity law.
b. inverse square law.
c. direct square law.
d. 15 percent rule.
inverse square law
