Deck 18: Quality Control for Computed Tomography Scanners

Question 1

Record keeping is not an important consideration in a QC program.

Answer 1

False

Question 2

Often a QC program can result in reduced downtime.

Answer 2

True

Question 3

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

A) Quality administration
B) Quality assurance
C) Quality control (QC)
D) Quality maintenance

Answer 3

Quality control (QC)

Question 4

All QC tests should be conducted on a monthly basis.

Question 5

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

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

Question 6

The following QC tests should be done annually except:

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

Question 7

Water phantoms are not used for QC tests.

Question 8

The tolerance limit for a CT number calibration QC test is:

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

Question 9

CT scanner manufacturers do not offer any information regarding QC testing.

Question 10

QC tests, test results, and interpretation of test results should be:

A) recorded in a QC logbook.
B) recorded on pieces of paper.
C) recorded on the bulletin board beside the CT scanner.
D) recorded in the positioning notebook of the technologist.

Question 11

Quantitative CT (QCT) phantoms are used to assess the CT dose output.

Question 12

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

Question 13

The first step in any QC is error correction.

Question 14

The following QC tests should be done biannually except:

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

Question 15

What term describes performance standards as a level under favorable circumstances at which a facility should work if feasible?

A) Achievable
B) Tolerable
C) Acceptable
D) Possible

Question 16

The following are all basic tenets of a QC program for CT 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 QC measurements must be stored in a controlled environment.

Question 17

QC tests must be performed on a routine basis.

Question 18

Regulatory agencies do not require any standard of quality.

Question 19

QC tests can be performed by all of the following except:

A) technologists.
B) medical physicists.
C) QC technicians.
D) department aides.

Question 20

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

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

Question 21

A higher level of noise in an image can cause possible failure in a low-contrast resolution QC test.

Question 22

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

Question 23

Techniques chosen for QC measures should match frequently used clinical techniques.

Question 24

It is unnecessary to perform QC tests after a major component has been replaced on a CT scanner.

Question 25

All QC tests must be performed by a medical physicist to ensure tolerable results.