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University
Computed Tomography: Axial vs Helical scan
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- 1. Multiple Choice
Both axial and spiral scan involves tube rotation around the patient.
True
False
- 2. Multiple Choice
The patient moves in the z-axis in ___ scan.
Localizer
Axial
Spiral
- 3. Multiple Choice
The axial scan is also known as ___.
step-and-shoot
volumetric
spiral
- 4. Multiple Choice
In an axial scan, the ____ remains stationary at desired location while the ___ rotates within the gantry.
x-ray tube, couch
couch, collimator
couch, x-ray tube
collimator, x-ray tube
- 5. Multiple Choice
___ is a slight pause in scanning between data acquisition.
Slice misregistration
Interscan delay
Volumetric scanning
Anatomy omissions
- 6. Multiple Choice
Helical scan advantages includes
eliminates interscan delay
shorter acquisition time
highest image quality
improved 3D and Multiplanar Reformation (MPR)
not all points in a slice will have 360º worth of information
- 7. Fill in the Blank
___ is a parameter that is commonly used to describe the CT table movement.
- 8. Multiple Choice
Sequential Scanning Steps
a) Gantry decelerated from constant operating speed to full stop
b) Data acquired during constant speed rotation
c) Table & patient indexed to next scanning position
d) Gantry must accelerate from full stop to constant operating speed required for data acquisition
b,a,c,d
d,b,a,c
c,a,b,d
d,a,c,b
- 9. Multiple Choice
Technological developments of helical CT
Slip-ring gantry designs
Very high power x-ray tubes
Interpolation algorithms to handle projection data
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