Quality Control Exam Questions with 100%
Verified Answers
A monitor’s ability to accurately display different shades or levels of brightness
from a test pattern is known as ______________ __________ - ✔️✔️luminance
response
Luminance response is essentially identical to a ___________ ________ -
✔️✔️contrast test
DICOM GSDF stands for what? - ✔️✔️Grayscale standard display function.
GSDF is based on human perception, with increments of brightness called
_________. - ✔️✔️JNDs (just noticeable differences)
AAPM recommends that luminance response should be within what % of the
GSDF standard? - ✔️✔️10%
Luminance ratio - ✔️✔️Maximum luminance divided by minimum luminance.
(Lmax/Lmin)
Neither an LCD or a CRT are capable of producing ___________________ while
they are energized. - ✔️✔️True black level.
*this can be seen in a completely dark room.
Luminance uniformity is defined as what? - ✔️✔️Consistency of a single brightness
level displayed across the screen.
, AAPM recommends that luminance uniformity not deviate more than what %
from the average? - ✔️✔️30%.
*different from luminance response, which is 10%
Luminance uniformity is checked on how many spots across the screen? - ✔️✔️5
What are the two types of reflectance? - ✔️✔️Diffuse and specular
What is diffuse reflectance? - ✔️✔️Ratio of the brightness of the general ambient
light in the room that is being reflected off the surface of the display screen to the
output brightness of the monitor itself.
Specular reflectance refers to what? - ✔️✔️Reflection of a specific, localized light
source behind the viewer of the display monitor, and is ratio of the reflected
brightness to the brightness of that light source.
In a reading room, ambient lighting should be dimmed to what level? -
✔️✔️Dimmed to a point where both diffuse and specular reflectance are below any
noticeable level.
What generally has much higher reflectance? CRT or LCD - ✔️✔️CRTs.
Who published guidelines for maximum illuminance in reading room? - ✔️✔️Task
group 18 of the AAPM
Verified Answers
A monitor’s ability to accurately display different shades or levels of brightness
from a test pattern is known as ______________ __________ - ✔️✔️luminance
response
Luminance response is essentially identical to a ___________ ________ -
✔️✔️contrast test
DICOM GSDF stands for what? - ✔️✔️Grayscale standard display function.
GSDF is based on human perception, with increments of brightness called
_________. - ✔️✔️JNDs (just noticeable differences)
AAPM recommends that luminance response should be within what % of the
GSDF standard? - ✔️✔️10%
Luminance ratio - ✔️✔️Maximum luminance divided by minimum luminance.
(Lmax/Lmin)
Neither an LCD or a CRT are capable of producing ___________________ while
they are energized. - ✔️✔️True black level.
*this can be seen in a completely dark room.
Luminance uniformity is defined as what? - ✔️✔️Consistency of a single brightness
level displayed across the screen.
, AAPM recommends that luminance uniformity not deviate more than what %
from the average? - ✔️✔️30%.
*different from luminance response, which is 10%
Luminance uniformity is checked on how many spots across the screen? - ✔️✔️5
What are the two types of reflectance? - ✔️✔️Diffuse and specular
What is diffuse reflectance? - ✔️✔️Ratio of the brightness of the general ambient
light in the room that is being reflected off the surface of the display screen to the
output brightness of the monitor itself.
Specular reflectance refers to what? - ✔️✔️Reflection of a specific, localized light
source behind the viewer of the display monitor, and is ratio of the reflected
brightness to the brightness of that light source.
In a reading room, ambient lighting should be dimmed to what level? -
✔️✔️Dimmed to a point where both diffuse and specular reflectance are below any
noticeable level.
What generally has much higher reflectance? CRT or LCD - ✔️✔️CRTs.
Who published guidelines for maximum illuminance in reading room? - ✔️✔️Task
group 18 of the AAPM
