Journal article
Reduction of half-scan shading artifact based on full-scan correction
Academic radiology, Vol.13(1), pp.55-62
01/2006
DOI: 10.1016/j.acra.2005.08.007
PMID: 16399032
Abstract
Temporal studies (such as blood perfusion) commonly are used to measure function. Radiation dosage is a primary limiting factor for these scans. Half-scan reconstruction can decrease dosage and improve temporal resolution, but is not viable for quantitative studies because of shading artifact. We propose a method for identifying the artifact and minimizing its effect.
It is possible to measure the shading artifact by producing both a full-scan and a half-scan reconstruction from the same projection data. A correlation was shown between the subset of data used for reconstruction and per-pixel variation. Furthermore, this variation can be parameterized by only the center angle of the projection data. By performing a single full-scan acquisition, it is possible to generate many half-scan reconstructions and measure the artifact; then future half-scan acquisitions can be corrected.
The artifact is caused by the inhomogeneity in the object being scanned. Before correction, the root mean square error between the half-scan reconstruction and the full-scan is 41.0. After correction, the error is decreased to 10.7, or 26% of the original value.
We present a method that can measure and correct for object-dependent half-scan shading artifact. This can enable half-scan reconstruction for use in quantitative temporal studies.
Details
- Title: Subtitle
- Reduction of half-scan shading artifact based on full-scan correction
- Creators
- John Arbash Meinel - Department of Radiology, University of Iowa, College of Medicine, 200 Hawkins Drive, Iowa City, IA 52242,USAEric HoffmanAnne CloughGe Wang
- Resource Type
- Journal article
- Publication Details
- Academic radiology, Vol.13(1), pp.55-62
- Publisher
- United States
- DOI
- 10.1016/j.acra.2005.08.007
- PMID
- 16399032
- ISSN
- 1076-6332
- eISSN
- 1878-4046
- Grant note
- EB002667 / NIBIB NIH HHS HL064368 / NHLBI NIH HHS
- Language
- English
- Date published
- 01/2006
- Academic Unit
- Roy J. Carver Department of Biomedical Engineering; Radiology; Internal Medicine
- Record Identifier
- 9984051524302771
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