RTBC - Primary exposure factors
UPDATED ACTUAL Exam Questions and
CORRECT Answers
mA in the x-ray tube is the unit of measure describing - CORRECT ANSWER - Tube
current
Which of the following describes the x-ray tube current - CORRECT ANSWER - Quantity
of electron flow
Which of the following statements describes the relationship between mA and beam intensity -
CORRECT ANSWER - Beam intensity is directly proportional to the mA
How is the x-ray beam changed when mA is increased by a factor of 2 - CORRECT
ANSWER - Beam quantity increases by a factor of two
Which of the following with double the quantity of photons in the x-ray beam? select two -
CORRECT ANSWER - - double the exposure time, but do not change the mA
- double the mA but do not change the exposure time
Which of the following statements describes the relationship between mA and receptor exposure
- CORRECT ANSWER - Receptor exposure is directly proportional to the mA
Which of the following statements describes the relationship between mA and patient dose -
CORRECT ANSWER - Patient dose is directly proportional to the mA
Increasing mA result, in which of the following - CORRECT ANSWER - Increased beam
quantity
, To reduce the patient those by half what must be done to the mA if all other factors are held
constant - CORRECT ANSWER - Reduce mA by half
An x-ray is taken using 200mA at 0.50 seconds and results in 0.10 mGy of patient exposure.
Assuming that all other factors remain constant, which mA settings would result in a patient
exposure of 0.20 mGy? - CORRECT ANSWER - 400mA
Exposure time is the amount of time that - CORRECT ANSWER - Electrons are flowing
through the x-ray tube
What is the unit of measure for exposure time? - CORRECT ANSWER - Seconds
what is the unit of measure for a tube current? - CORRECT ANSWER - mA
What property of the x-ray beam is influenced by changes to the mAs - CORRECT
ANSWER - Intensity
An exposure is made using 100mA and 0.05 seconds. How old beam intensity change of the
exposure is repeated using 200mA and 0.025s? - CORRECT ANSWER - Beam intensity
remains the same
Exposures made using 100mA and 0.05s. How will the patient does change of the exposure is
repeated using 200mA and 0.025s? - CORRECT ANSWER - Patient does remains the
same
Which of the following is an important benefit of using a short exposure time - CORRECT
ANSWER - Decreases motion blur
Which of the following exposure settings will produce a radiograph with the least amount of
motion blur? - CORRECT ANSWER - 420mA and 0.001s
UPDATED ACTUAL Exam Questions and
CORRECT Answers
mA in the x-ray tube is the unit of measure describing - CORRECT ANSWER - Tube
current
Which of the following describes the x-ray tube current - CORRECT ANSWER - Quantity
of electron flow
Which of the following statements describes the relationship between mA and beam intensity -
CORRECT ANSWER - Beam intensity is directly proportional to the mA
How is the x-ray beam changed when mA is increased by a factor of 2 - CORRECT
ANSWER - Beam quantity increases by a factor of two
Which of the following with double the quantity of photons in the x-ray beam? select two -
CORRECT ANSWER - - double the exposure time, but do not change the mA
- double the mA but do not change the exposure time
Which of the following statements describes the relationship between mA and receptor exposure
- CORRECT ANSWER - Receptor exposure is directly proportional to the mA
Which of the following statements describes the relationship between mA and patient dose -
CORRECT ANSWER - Patient dose is directly proportional to the mA
Increasing mA result, in which of the following - CORRECT ANSWER - Increased beam
quantity
, To reduce the patient those by half what must be done to the mA if all other factors are held
constant - CORRECT ANSWER - Reduce mA by half
An x-ray is taken using 200mA at 0.50 seconds and results in 0.10 mGy of patient exposure.
Assuming that all other factors remain constant, which mA settings would result in a patient
exposure of 0.20 mGy? - CORRECT ANSWER - 400mA
Exposure time is the amount of time that - CORRECT ANSWER - Electrons are flowing
through the x-ray tube
What is the unit of measure for exposure time? - CORRECT ANSWER - Seconds
what is the unit of measure for a tube current? - CORRECT ANSWER - mA
What property of the x-ray beam is influenced by changes to the mAs - CORRECT
ANSWER - Intensity
An exposure is made using 100mA and 0.05 seconds. How old beam intensity change of the
exposure is repeated using 200mA and 0.025s? - CORRECT ANSWER - Beam intensity
remains the same
Exposures made using 100mA and 0.05s. How will the patient does change of the exposure is
repeated using 200mA and 0.025s? - CORRECT ANSWER - Patient does remains the
same
Which of the following is an important benefit of using a short exposure time - CORRECT
ANSWER - Decreases motion blur
Which of the following exposure settings will produce a radiograph with the least amount of
motion blur? - CORRECT ANSWER - 420mA and 0.001s
