Which of the following is considered a quality control daily test for a CT scanner?
Answer
o linearity of CT numbers
o low- and high-contrast resolution
o image slice thickness
o CT number accuracy
o spatial resolution - ANSWER o CT number accuracy
Which of the following is the common term for the artifact created by the presence of met-
als in the patient in CT imaging?
Answer
o ringing
o partial volume
o arcing
o biasing
o streaking - ANSWER streaking
What is the average CT number for the lung in Hounsfield units?
Answer
o -1000
o -500
o -100
o -50
o 0 - ANSWER o -500
1
, Where is the x-ray generator located in a CT scanner?
Answer
o under the patient imaging table
o inside the operator's console
o inside the gantry
o inside the electronics cabinet
o inside the computer workstation - ANSWER o inside the gantry
Which of the following operations would help in improving the CT image contrast after dis-
play?
Answer
o use of a smoothing filter
o use of an edge enhancement filter
o use of windowing
o use of a formatter
o use of a PHA - ANSWER o use of windowing
Which of the following is the device used to convert scintillation light into an electric signal
in a CT scanner?
Answer
o photomultiplier tube
o analog to digital converter
o Xenon chamber
o photodiode
o cathode - ANSWER o photodiode
2
Answer
o linearity of CT numbers
o low- and high-contrast resolution
o image slice thickness
o CT number accuracy
o spatial resolution - ANSWER o CT number accuracy
Which of the following is the common term for the artifact created by the presence of met-
als in the patient in CT imaging?
Answer
o ringing
o partial volume
o arcing
o biasing
o streaking - ANSWER streaking
What is the average CT number for the lung in Hounsfield units?
Answer
o -1000
o -500
o -100
o -50
o 0 - ANSWER o -500
1
, Where is the x-ray generator located in a CT scanner?
Answer
o under the patient imaging table
o inside the operator's console
o inside the gantry
o inside the electronics cabinet
o inside the computer workstation - ANSWER o inside the gantry
Which of the following operations would help in improving the CT image contrast after dis-
play?
Answer
o use of a smoothing filter
o use of an edge enhancement filter
o use of windowing
o use of a formatter
o use of a PHA - ANSWER o use of windowing
Which of the following is the device used to convert scintillation light into an electric signal
in a CT scanner?
Answer
o photomultiplier tube
o analog to digital converter
o Xenon chamber
o photodiode
o cathode - ANSWER o photodiode
2
