Question

Regarding the testing of image quality: 

a. To check the spatial resolution of the system, a high kV method is used 

b. The grid for spatial resolution testing is positioned parallel to the matrix 

c. For contrast resolution, a low-contrast test object is used 

d. The test object for contrast resolution contains circular inserts of high atomic number 

e. The Leeds test object is used for contrast resolution testing

Answer 1

a. False. A low kV method is used to reduce scatter and maximize contrast. 

b. False. The grid is generally angled at 45° with respect to the matrix in order to avoid interference artefacts on the displayed image. 

c. True. 

d. True. Contrast resolution is tested with a low-contrast test object, such as a Leeds test object, comprising a flat disc 6 mm thick and 200–300 mm in diameter containing circular inserts of high-atomic-number material that produce varying levels of contrast. 

e. True.