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First Generation CT Systems: Parallel-Beam Geometry

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First Generation CT Systems: Parallel-Beam Geometry

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Questions and Answers

What distinguishes third-generation CT scanners from second-generation scanners?

Translation motion and single detector

Multiple detectors and stationary detectors

Pencil beam and single detector

Fan beam and rotating detectors (correct)

Which characteristic is unique to fourth-generation CT scanners?

Rotating x-ray source inside a fixed detector array (correct)

Translation motion and single detector

Fan beam and rotating detectors

Electron beam scanning

What is a key feature of fifth-generation CT scanners?

Curved detector array with several hundred detectors

Fan beam and rotating detectors

Translation motion with multiple detectors

Electron beam scanning with a stationary detector array (correct)

How do third-generation CT scanners acquire projection data for a single image?

Using fan beam rotation with no translation motion Signup and view all the answers

Why are the reconstruction algorithms for second-generation CT scanners simpler compared to third-generation ones?

Third-generation scanners handle fan-beam projection data Signup and view all the answers

What is a characteristic of first-generation CT systems?

Use a parallel-beam geometry Signup and view all the answers

Why was the scanner in the first generation limited?

Only head scans could be performed Signup and view all the answers

What advantage does the highly collimated beam provide in first-generation CT systems?

Excellent rejection of scattered radiation Signup and view all the answers

What type of scan geometry do second-generation CT systems use?

Translate/rotate Signup and view all the answers

Why does the second generation of CT systems have an advantage over the first generation?

Faster scan time per slice Signup and view all the answers

What was one of the challenges faced by the first-generation CT systems?

Generated a lot of heat and required elaborate cooling systems Signup and view all the answers