Question

Concerning a digital radiography system: 

a. An early step in image acquisition is conversion of data from an analogue to digital format 

b. The size of the image detector is not important, as the final image may be manipulated electronically 

c. Detector sensitivity must be high 

d. Pixel size influences image resolution 

e. Noise is less significant than with film-screen radiography

Answer 1

a. True. The image from the detector is converted by the analogue-to-digital converter (ADC) into a digital format before being transferred to the computer system. 

b. False. Unlike film-screen radiography where the size of the film can be changed depending on the examination, the detector in digital radiography must be large enough to cover the range of examinations that will be performed on the same system. 

c. True. This is to ensure that minimal doses are required. 

d. True. 

e. False. Noise occurs in all imaging systems and contributes to the final image quality.