Lecture 12: Central Section Theorem Flashcards
1
Q
When is there enough information in a projection to construct an image in real space?
A
When k-space is filled.
2
Q
How is k-space filled by an x-ray CT scanner?
A
Projections are taken at a sufficient number of angles through the object to fill k-space after being Fourier transformed.
3
Q
Define crude back projection
A
The generation of a crude image of an object by summing the result of spreading each projection back across the image space.
4
Q
Define filtered back projection
A
Back projection where an alternate projection, Pā, is used rather than P. This projection is filtered where the components are amplified in proportion to their spatial frequency.
5
Q
Describe the shape of the filter used in filtered back projection
A
