Question

Which statement is TRUE: amplified electrical signal obtained from detectors must be digitized, digital CT images are numerical representations of cross-sectional anatomy, digital signals may be formed by sampling analog signals at discrete time intervals?

1) amplified electrical signal obtained from detectors must be digitized
2) digital CT images are numerical representations of cross-sectional anatomy
3) digital signals may be formed by sampling analog signals at discrete time intervals

Answer 1

The TRUE statement is that digital signals may be formed by sampling analog signals at discrete time intervals.

Step-by-step explanation:

The statement that is TRUE is: digital signals may be formed by sampling analog signals at discrete time intervals.

In electronic devices, digital signals are used with diodes and transistors, and they switch between two fixed voltage values. These signals are formed by sampling analog signals at discrete time intervals, converting continuous analog signals into discrete digital signals.

For example, in computed tomography (CT) scanners, detectors register x-rays passing through the patient's body, and the relative absorption of x-rays is processed using complex computer algorithms to produce a highly-detailed digital image.