Questions and Answers
What characterizes First-generation CT systems?
Single X-ray source (pencil beam or parallel-beam geometry)
What happens during the scan process in First-generation CT systems?
The source translates in a linear motion across the patient
What is an advantage of First-generation CT systems?
Flexibility in the choice of scan parameters
What is a limitation of First-generation CT systems?
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What is generated during the operation of First-generation CT systems?
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What type of scans can be performed using First-generation CT systems?
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Study Notes
First-Generation CT Systems
- Characterized by single X-ray source with parallel-beam geometry
- Uses a single highly collimated X-ray pencil beam and detector directed across the patient isocenter
- Multiple measurements of X-ray transmission obtained by translating X-ray source and detector simultaneously in a scan plane
- Beam translated in a linear motion across the patient to obtain a projection profile
- Process repeated for a given number of angular rotations (approximately 1 degree) until source and detector rotated by 180 degrees
- Advantages:
- Simplicity
- Good view-to-view detector matching
- Flexibility in choosing scan parameters (resolution and contrast)
- Highly collimated beam provides excellent rejection of scattered radiation
- Limitations:
- Only head scans can be performed
- Generates a lot of heat, requiring elaborate cooling system
- Scan time is very slow (about 1 minute per slice, averaging 25-30 minutes per scan)
