11 Questions
What distinguishes third-generation CT scanners from second-generation scanners?
Fan beam and rotating detectors
Which characteristic is unique to fourth-generation CT scanners?
Rotating x-ray source inside a fixed detector array
What is a key feature of fifth-generation CT scanners?
Electron beam scanning with a stationary detector array
How do third-generation CT scanners acquire projection data for a single image?
Using fan beam rotation with no translation motion
Why are the reconstruction algorithms for second-generation CT scanners simpler compared to third-generation ones?
Third-generation scanners handle fan-beam projection data
What is a characteristic of first-generation CT systems?
Use a parallel-beam geometry
Why was the scanner in the first generation limited?
Only head scans could be performed
What advantage does the highly collimated beam provide in first-generation CT systems?
Excellent rejection of scattered radiation
What type of scan geometry do second-generation CT systems use?
Translate/rotate
Why does the second generation of CT systems have an advantage over the first generation?
Faster scan time per slice
What was one of the challenges faced by the first-generation CT systems?
Generated a lot of heat and required elaborate cooling systems
Learn about first-generation CT systems with parallel-beam geometry, where a single X-ray source and detector obtain multiple measurements of X-ray transmission. Understand how the source and detector translate simultaneously to obtain projection profiles in linear motion across the patient.
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