Ch. 22 Digital radiographic quality control

Question 1

What does SMPTE stand for?

Answer 1

The Society of Motion Picture and Television Engineers

Question 2

SMPTE has done what?

Answer 2

described the format, dimensions, and contrast characteristics of a pattern used to make measurements of the resolution of display systems.

Question 3

What does the SMPTE pattern do?

Answer 3

most commonly it is the observation of 5% and 95% luminance patches. This helps to point out any gross deviations in luminance adjustments.

Question 4

Who recommends that the SMPTE pattern be used for QC purposes?

Answer 4

the American College of Radiology (ACR)

Question 5

What is NEMA?

Answer 5

National Electrical Manufacturers Association

Question 6

What is the DICOM standard?

Answer 6

A standard that ACR and NEMA founded to allow medical images to be transferred according to the DICOM standard to be displayed on any DICOM compatible display device with a consistant gray scale.

Question 7

What is GSDF?

Answer 7

Gray Scale Display Function (DICOM standard) it is now mandated for all digital display devices.

Question 8

What is DIN 2001 and who is behind it?

Answer 8

It was developed as an acceptance testing standard to address teh requirement for digital display devices. The German standards institution, Deutsches Institut fur Normung

Question 9

VESA?

Answer 9

the Flat Panel Display Measurement standard that was released by the Video Electronics Standard Association.

Question 10

Luminance meter should be able to measure luminance in the range of …

Answer 10

0.05 to 1000 cd/m^2 with better than 5% accuracy and a precision of at least 0.01

Question 11

What does the TG 18-QC test pattern test for?

Answer 11

Geometric distortion

Question 12

How does the TG 18-QC test pattern work?

Answer 12

By filling the entire screen with the test pattern, one can look for pincushion and barrel like distortions.