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Transcript
6
Practical Issues and Artifacts
Aliasing - Insufficient angular sampling
– reducing the number of projections is desirable for the purpose of
reducing scanning time
reducing noise
reducing motion artifact
reducing patient dose
Figure 9. FBP images of the Shepp-Logan phantom from various numbers of views.
Aliasing - Insufficient radial sampling
– occurs when there is a sharp intensity change caused by, for example, bones.
Figure 10. FBP images demonstrating aliasing artifacts.
Incomplete/Missing data
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