Computed Tomography Test CT Radiation Safety and Dosimetry

Question 1

Which unit is used to express the effective radiation dose received by a patient during a CT scan?

Accepted Answer

Millisievert (mSv)

Answer

Milligray (mGy)

Answer

Roentgen (R)

Answer

Rad

Question 2

What does the term CTDI stand for in CT radiation dosimetry?

Accepted Answer

Computed Tomography Dose Index

Answer

CT Diagnostic Imaging

Answer

Computed Tomography Density Index

Answer

CT Dose Interval

Question 3

Which principle of radiation protection states that doses should be kept as low as reasonably achievable?

Accepted Answer

ALARA

Answer

BERT

Answer

LNT

Answer

NCRP

Question 4

Increasing the mAs in CT by a factor of 4 will have what effect on image noise?

Accepted Answer

Reduce noise by 50%

Answer

Double the noise

Answer

Eliminate noise entirely

Answer

Quadruple the noise

Question 5

What is the primary purpose of using automatic exposure control (AEC) in CT?

Accepted Answer

Adapt tube current to patient size and anatomy

Answer

Increase scan speed

Answer

Improve spatial resolution

Answer

Reduce contrast agent volume

Question 6

Which CT parameter, when increased, directly increases patient radiation dose?

Accepted Answer

mAs

Answer

Pitch (above 1.0)

Answer

Detector row width

Answer

FOV