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Conventional vs Helical CT Scanners

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Questions and Answers

What is the primary limitation of conventional CT scanning as described?

It requires the X-ray tube to remain stationary.

It has poor temporal resolution and long procedure times. (correct)

It uses advanced software for image reconstruction.

It scans multiple slices simultaneously.

How does helical CT improve upon the limitations of conventional CT?

By focusing exclusively on 2D image acquisition techniques.

By using a single rotation of the X-ray tube to scan all slices.

By allowing the X-ray tube and detector to rotate continuously while moving the patient. (correct)

By scanning larger volumes while the patient is stationary.

In a helical CT scan, what does the term 'duty cycle' refer to?

The overall duration of the scanning procedure.

The percentage of time the X-ray tube is inactive during a scan.

The length of time spent on patient preparation.

The ratio of active data acquisition time to total scanning time. (correct)

What advancement does helical CT offer in terms of imaging technique?

<p>It enables true 3D image acquisition in a single breath-hold.</p> Signup and view all the answers

What mechanical process is utilized in conventional CT scanners that contributes to longer scan times?

<p>Cables are spooled and released during rotation, requiring pause periods.</p> Signup and view all the answers

Study Notes

Conventional CT Scanners (3rd and 4th Generation)

Patient scanned one slice at a time.
X-ray tube and detectors rotate 360 degrees or less to scan one slice.
Table and patient stay stationary during the scan.
Requires multiple rotations (scanning-braking-reversal).
Data acquisition time is only 1-2 seconds out of 8-10 seconds per scan.
Low temporal resolution and lengthy procedure time.

Helical CT Scanners

Scans a volume of tissue by moving the patient continuously through the gantry while the X-ray tube and detectors rotate continuously.
X-ray beam traces a path around the patient.
X-ray tube and detectors rotate continuously, while the patient’s table moves through the rotating gantry.
Achieves a spiral or helical movement relative to the patient (approximately one revolution per second).
Continuous data acquisition throughout the scan.
High duty cycle (nearly 100%) due to continuous data acquisition.
Improves volume coverage speed.
Enables fast and continuous data acquisition of a complete volume.
Allows true 3D image acquisition within a single breath-hold.

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Description

Explore the differences between conventional and helical CT scanners in this quiz. Learn how each technology works, including their scanning methods and data acquisition techniques. Test your knowledge on the advantages and limitations of each type of scanner.