RADR 2309: Module 6 Exam Focus – Key
Concepts from Chapters 20 & 23
Quality control monitoring of a digital display device is principally the responsibility of which team
member? - correct answer ✔✔Medical physicist
With regard to a digital display device, what is the difference between luminescence and IL
luminescence? - correct answer ✔✔Luminescence is light emitted; IL luminescence is incident light
Which of the following image distortions is not associated with a digital display device? - correct answer
✔✔Pincushion
Maximum nonuniformity for an individual digital display device should be less than what value? - correct
answer ✔✔30%
Digital image spatial resolution is determined by - correct answer ✔✔pixel size
Digital display device noise principally affects what image characteristic? - correct answer ✔✔Contrast
resolution
What is the purpose of the Gray Scale Display Function (GSDF)? - correct answer ✔✔Maintain perceived
brightness on any digital display device
Which standard procedure should be applied by the quality control (QC) technologist regularly to each
digital display device? - correct answer ✔✔AAPM TG 18
What instrument is used to perform quality control luminescence measurements of digital display
devices? - correct answer ✔✔Photometer
What instrument should be used to ensure proper ambient light level in a reading room? - correct
answer ✔✔Illuminescence meter
, what is a SMPTE pattern - correct answer ✔✔An electronic test pattern developed by the Society of
Motion Picture and Television Engineers for the evaluation of monitor performance quality.
what is pincushion distortion - correct answer ✔✔An artifact associated with faulty electronics of an
image-intensifier tube
what procedure visualizes pincushion distortion - correct answer ✔✔fluoro
Which TG 18 test pattern is used to evaluate digital display resolution - correct answer ✔✔TG18-CX test
pattern
how does the TG18-CX test pattern appear - correct answer ✔✔Squares and dots in central and
peripheral regions.
Which AAPM TG 18 test pattern is used to evaluate digital display noise - correct answer ✔✔TG18-AFC
how does TG18-AFC pattern appear - correct answer ✔✔A pattern of low-contrast squares
When should a medical physicist perform digital display device quality control? - correct answer
✔✔Initially as an acceptance test.
Annually
post any major repair or modification.
What is threshold of visibility? - correct answer ✔✔The lowest illuminance that can be perceived.
What is digital display device noise? - correct answer ✔✔Electronic fluctuations that interfere with the
displayed image
What is the purpose of the GSFD = Grayscale Display Function? - correct answer ✔✔To allow medical
images to be displayed on any DICOM-compatible digital display device with a consistent gray scale
appearance.
Concepts from Chapters 20 & 23
Quality control monitoring of a digital display device is principally the responsibility of which team
member? - correct answer ✔✔Medical physicist
With regard to a digital display device, what is the difference between luminescence and IL
luminescence? - correct answer ✔✔Luminescence is light emitted; IL luminescence is incident light
Which of the following image distortions is not associated with a digital display device? - correct answer
✔✔Pincushion
Maximum nonuniformity for an individual digital display device should be less than what value? - correct
answer ✔✔30%
Digital image spatial resolution is determined by - correct answer ✔✔pixel size
Digital display device noise principally affects what image characteristic? - correct answer ✔✔Contrast
resolution
What is the purpose of the Gray Scale Display Function (GSDF)? - correct answer ✔✔Maintain perceived
brightness on any digital display device
Which standard procedure should be applied by the quality control (QC) technologist regularly to each
digital display device? - correct answer ✔✔AAPM TG 18
What instrument is used to perform quality control luminescence measurements of digital display
devices? - correct answer ✔✔Photometer
What instrument should be used to ensure proper ambient light level in a reading room? - correct
answer ✔✔Illuminescence meter
, what is a SMPTE pattern - correct answer ✔✔An electronic test pattern developed by the Society of
Motion Picture and Television Engineers for the evaluation of monitor performance quality.
what is pincushion distortion - correct answer ✔✔An artifact associated with faulty electronics of an
image-intensifier tube
what procedure visualizes pincushion distortion - correct answer ✔✔fluoro
Which TG 18 test pattern is used to evaluate digital display resolution - correct answer ✔✔TG18-CX test
pattern
how does the TG18-CX test pattern appear - correct answer ✔✔Squares and dots in central and
peripheral regions.
Which AAPM TG 18 test pattern is used to evaluate digital display noise - correct answer ✔✔TG18-AFC
how does TG18-AFC pattern appear - correct answer ✔✔A pattern of low-contrast squares
When should a medical physicist perform digital display device quality control? - correct answer
✔✔Initially as an acceptance test.
Annually
post any major repair or modification.
What is threshold of visibility? - correct answer ✔✔The lowest illuminance that can be perceived.
What is digital display device noise? - correct answer ✔✔Electronic fluctuations that interfere with the
displayed image
What is the purpose of the GSFD = Grayscale Display Function? - correct answer ✔✔To allow medical
images to be displayed on any DICOM-compatible digital display device with a consistent gray scale
appearance.
