12 Questions
What is the main purpose of interpolation algorithms in helical CT scans?
To reconstruct axial images from the spiral volume data set
What is the definition of pitch in helical CT scans?
The ratio of table displacement per 360° rotation to section thickness
What happens when the pitch is less than 1 in a helical CT scan?
The coils of the helix overlap
What is the main advantage of a helical CT scanner compared to a conventional CT scanner?
All of the above
What happens when the pitch is greater than 1 in a helical CT scan?
There is a gap between the x-ray beam edge of the consecutive loops
What is the relationship between pitch and table travel per rotation in helical CT scans?
Pitch = table travel / beam width
What is the mathematical process that allows reconstruction of an image at any z-axis position?
Interpolation
What is the primary challenge faced by conventional reconstruction algorithms when dealing with helical CT data?
The X-ray source travels in a helical trajectory around the patient.
What is the purpose of the interpolation algorithm in helical CT scanning?
To convert the helical data set into a series of planar image data sets.
Why is data interpolation necessary during helical CT image reconstruction?
The image plane does not contain enough data for direct reconstruction.
What is the result of the interpolation process in helical CT scanning?
A series of planar image data sets in the reconstruction plane of interest.
What is the difference between interpolation and extrapolation?
Interpolation estimates values between known data points, while extrapolation estimates values beyond the range of known data points.
Learn about the mathematical process of interpolation and reconstruction of images in helical CT scans. Understand the difference between interpolation and extrapolation and how image data are continuously received during helical CT scans.
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