Question

Regarding spatial resolution in computed and digital imaging systems: 

a. It is affected in indirect digital systems by the spread of light photons within the scintillator 

b. It is unaffected in digital radiography by the size of the detector elements within the thin-film transistor 

c. In computed radiography, spatial resolution is unrelated to the thickness of the phosphor 

d. For both computed and digital radiography, pixel size affects spatial resolution 

e. The modulation transfer function (MTF) is an objective measure of spatial resolution

Answer 1

a. True. This may be minimized by arranging the caesium iodide into narrow parallel columns, reducing the degree of reflection that may occur. 

b. False. The larger the detector element, the more light or X-ray photons are detected by that element so that structures smaller than the detector size cannot be distinguished separately. 

c. False. Increasing the thickness of the phosphor will increase the scattering of the laser light during image plate read-out. 

d. True. 

e. True.