Concerning the digital radio graphic image: a. Signal digitization ex

1.	Concerning the digital radio graphic image: a. Signal digitization expresses the image as continuous grey-scale values b. The function of the analogue-to-digital converter (ADC) is to digitize the input while maintaining resolution of the information c. A binary system is used for signal digitization d. Eight bits is typically sufficient for most images e. Data compression for storage may lead to loss of data
Answer» a. False. They are expressed as discrete grey-scale values. It is the analogue input that is continuous. b. True. c. True. d. False. Eight bits may be sufficient for images with high noise (e.g. radionuclide imaging), but for imaging requiring greater resolution, 12 bits or more are required. e. True. Greater compression can lead to loss of data (using ‘irreversible algorithms’).

Concerning the digital radio graphic image: a. Signal digitization expresses the image as continuous grey-scale values b. The function of the analogue-to-digital converter (ADC) is to digitize the input while maintaining resolution of the information c. A binary system is used for signal digitization d. Eight bits is typically sufficient for most images e. Data compression for storage may lead to loss of data

Answer»

a. False. They are expressed as discrete grey-scale values. It is the analogue input that is continuous.

b. True.

c. True.

d. False. Eight bits may be sufficient for images with high noise (e.g. radionuclide imaging), but for imaging requiring greater resolution, 12 bits or more are required.

e. True. Greater compression can lead to loss of data (using ‘irreversible algorithms’).

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