Deck 20: Quality Control for Computed Tomography Scanners

Question 1

Often a quality control program can result in reduced down time.

Answer 1

True

Question 2

All of the following are possible causes of failure for the standard deviation of the computed tomography number except:

A)electronic noise from amplifiers
B)decreased dose
C)electronic noise from the analog-to-digital converters
D)miscalibration of the algorithm

Answer 2

miscalibration of the algorithm

Question 3

The following quality control tests should be done annually except:

A)computed tomography number versus patient size
B)hard copy output
C)computed tomography number versus slice width
D)standard deviation of computed tomography number in water

Answer 3

standard deviation of computed tomography number in water

Question 4

Quality control tests that are effective must be objective, quantitative, and easy and can be done very quickly.

Question 5

Quality control test results do not have to be interpreted as soon as the tests are completed.

Question 6

In quality control, steps are taken to correct problems.

Question 7

Record keeping is not an important consideration in a quality control program.

Question 8

The tolerance limit for a computed tomography number calibration quality control test is:

A)±3 computed tomography numbers
B)±5 computed tomography numbers
C)±8 computed tomography numbers
D)no tolerance limit has been established

Question 9

Quality control tests can be performed by all of the following except:

A)technologists
B)medical physicists
C)quality control technicians
D)department aides

Question 10

Which tests the performance of a computed tomography scanner on a number of parameters and compares the performance with a standard?

A)quality administration
B)quality assurance
C)quality control
D)quality maintenance

Question 11

Computed tomography scanner manufacturers do not offer any information regarding quality control testing.

Question 12

The average CT number of water QC test should be done:

A)daily
B)weekly
C)monthly
D)annually

Question 13

All quality control tests should be conducted on a monthly basis.

Question 14

Quality control tests, test results, and interpretation of test results should be:

A)recorded in a quality control logbook
B)recorded on pieces of paper
C)recorded on the bulletin board beside the computed tomography scanner
D)recorded in the positioning notebook of the technologist

Question 15

Water phantoms are not used for quality control tests.

Question 16

Regulatory agencies do not require any standard of quality.

Question 17

The following are all basic tenets of a quality control program for computed tomography scanners except:

A)tests should be performed on a regular period basis
B)prompt interpretation of the results
C)faithful record keeping
D)phantoms for quality control measurements must be stored in a controlled environment

Question 18

Quality control tests must be performed on a routine basis.

Question 19

A measurement of a computed tomography scanner's performance to ensure the scanner is operating at an acceptable level describes:

A)quality administration
B)quality assurance
C)quality control
D)quality maintenance

Question 20

A possible cause of failure for the high-contrast resolution quality control test is that of an enlarged focal spot in the x-ray tube.

Question 21

The following quality control tests should be done biannually except:

A)high-contrast resolution
B)low-contrast resolution
C)light field accuracy
D)flatness of computed tomography number