DR Quality Control

qualified medical physicist

to ensure proper functioning of digital display device, it is essential that a comprehensive QC program be implemented under the supervision of a ______?

the society of motion picture and television engineers (SMPTE)

Describe the format, dimension, and contrast characteristic of a pattern used to make measurements of the resolution of display systems

National Electrical Manufacturers Association (NEMA - DICOM)

they present their work as a document known as the gray scale display function (GSDF). Used for consistent grayscale appearance

GSDF

it is now mandated for all digital display devices

Video Electronics Standard Association (VESA)

they provide a set of instructions that can be used to help in the evaluation of system performance according to the compliance standard

FPDM

flat panel display measurement

DIN 2001 or Deutsches Institut fur Normung

it is developed as an acceptance testing standard to address the requirement for digital display devices

DIN 2001

It called for a joint performance evaluation of the imaging modality and the digital display device

American Association of Physicist in Medicine (AAPM TG 18)

used to perform qualitative and quantitative tests

photometer, illuminance meter, and colorimeter

what are the test tools

Photometer

the luminance response of monitors and luminance uniformity measurement

0.05 to 1000 cd/m2 , 5%, 0.01

photo meter should be able to measure luminance in the range of ___ to ____ with a better than ____ and a precision of at ___.

3%

Commission Internationale de I'Eclairage (CIE) standard photopic spectral response within the range of

Peter North

he is the first to use a near-range photometer during digital display device evaluation

Illuminance Meter

it evaluate monitor display reflection and to assess ambient light condition

Colorimeter

to measure CIE-specified color coordinates of a digital display device

Geometric DIstortion, reflection, luminance response, display resolution, and display noise

what are the digital display device quality control

Geometric Distortion

by filling the entire screen with the test pattern, one can look for pincushion and barrel-like distortion

TG 18-QC and TG 18-LPV/ LPH test patterns

Used in the Visual assessment of geometric distortion

Reflection

It appears as specular or diffuse

15 degree angle, 30-50 cm

to assess specular reflection, you must turn off the monitor and look for sources of illumination within a ------ of observation at an approx. distance of -----. Look for image of various light sources and any high-contrast pattern from the viewer's clothing or the surrounding

low contrast pattern, ambient lighting and total darkness

to evaluate diffuse reflection, one has to observe the threshold of visibility for ------ under -----and -------

Luminance Response

used to perform a qualitative evaluation of the luminance response of a digital display device

30 cm

luminance response patter should be evaluated from a distance of approx. -----?

171 cd/m2

maximum luminance value should be greater than ---?

magnifying glass

the CX pattern in the middle and in the corner can be evaluated with a ------ and compared

Display Noise

any high-frequency fluctuations or patterns that interfere with detection of the true signal

TG 18-QC

Routine QC test by the QC technologist using the ______ test patterns

specular reflection

reflection of light from a monochrome monitor

diffuse reflection

reflection with a color CRT

reading environment and digital display devices

What are the new requirements of DR?