Explain the fundamental difference between third- and fourth-generation CT systems. Explain why ring artifacts are more common in CT systems with a third-generation design. Why is an ADC a necessary...

Explain the fundamental difference between third- and fourth-generation CT systems. Explain why ring artifacts are more common in CT systems with a third-generation design. Why is an ADC a necessary part of the DAS? Why is it important for all CT staff to set landmarks in the same way?