Abstract
Multi-slice helical CT-systems suffer from windmill artifacts: black/white patterns that spin off of features with high longitudinal gradients. The number of black/white pairs matches the number of slices (detector rows) in the multi-slice detector. The period of the spin is the same as the helical pitch. We investigate the cause of the pattern by following the traces of selected voxels through the multi-slice detector array as a function of view position. This forms an "extracted sinogram" which represents the data used to reconstruct that specific voxel. Now we can determine the cause of the artifact by correlating the windmill streak in the image with the extracted data. The investigation shows that inadequate sampling along the longitudinal direction causes the artifact.
Original language | English (US) |
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Pages (from-to) | 1918-1927 |
Number of pages | 10 |
Journal | Proceedings of SPIE - The International Society for Optical Engineering |
Volume | 5032 III |
DOIs | |
State | Published - Sep 15 2003 |
Externally published | Yes |
Event | Medical Imaging 2003: Image Processing - San Diego, CA, United States Duration: Feb 17 2003 → Feb 20 2003 |
Keywords
- Artifacts
- Helical CT
- Multi-slice CT
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Computer Science Applications
- Applied Mathematics
- Electrical and Electronic Engineering