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Questions and Answers
What is the main difference between the X-ray source and fan beam in a fourth-generation scanner?
What is the main difference between the X-ray source and fan beam in a fourth-generation scanner?
- The X-ray source rotates, while the fan beam is stationary.
- The X-ray source and fan beam both rotate. (correct)
- The fan beam is stationary, while the X-ray source moves up and down.
- The X-ray source is stationary, while the fan beam rotates.
What is the typical scan time for a fourth-generation scanner?
What is the typical scan time for a fourth-generation scanner?
- Around 2 seconds (correct)
- Around 30 seconds
- Around 1 minute
- Around 10 minutes
How many detectors are typically present in a fourth-generation scanner?
How many detectors are typically present in a fourth-generation scanner?
- 600 to 1200
- 4800 to 12000
- 600 to 4800 (correct)
- 1200 to 6000
What is the relationship between the number of detectors and the number of views in a fourth-generation scanner?
What is the relationship between the number of detectors and the number of views in a fourth-generation scanner?
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What is a common feature of both third- and fourth-generation systems?
What is a common feature of both third- and fourth-generation systems?
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Study Notes
Fourth-Generation CT Scanner
- X-ray source and fan beam rotate about the isocenter, while the detector array remains stationary.
- Detector array consists of 600 to 4800 independent detectors in a circle, surrounding the patient.
- Scan times are less than those of third-generation scanners, approximately 2 seconds.
- Number of views equals the number of detectors.
Detector Geometries
- Two geometries are used in fourth-generation systems:
- Rotating x-ray source inside a fixed detector array
- Rotating x-ray source outside a nutating detector array
Commercial Availability
- Both third- and fourth-generation systems are commercially available with advanced configurations.
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