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Reduction of half-scan shading artifact based on full-scan correction
John Arbash Meinel1, Eric Hoffman, Anne Clough
1Department of Radiology, University of Iowa, College of Medicine, 200 Hawkins Drive, Iowa City, IA 52242,USA.
Academic Radiology
|January 10, 2006
Summary
This study introduces a novel method to identify and minimize shading artifact in half-scan reconstruction, enabling quantitative temporal studies with reduced radiation dosage.
Area of Science:
- Medical Imaging
- Quantitative Analysis
- Image Reconstruction
Background:
- Temporal studies, crucial for assessing function (e.g., blood perfusion), are limited by radiation dosage.
- Half-scan reconstruction offers reduced dosage and improved temporal resolution but introduces shading artifacts, hindering quantitative accuracy.
Purpose of the Study:
- To develop and validate a method for identifying and correcting object-dependent shading artifacts in half-scan CT reconstructions.
- To enable the use of half-scan reconstruction for quantitative temporal imaging applications.
Main Methods:
- Measuring shading artifact by comparing full-scan and half-scan reconstructions from identical projection data.
- Correlating per-pixel variation in reconstructions with the subset of projection data used, parameterized by center angle.
- Generating multiple half-scan reconstructions from a single full-scan acquisition to characterize and correct the artifact.
Main Results:
- The shading artifact is directly linked to object inhomogeneity.
- Before correction, the root mean square error between half-scan and full-scan reconstructions was 41.0.
- Post-correction, the root mean square error was reduced to 10.7, representing a 74% decrease.
Conclusions:
- A novel method effectively measures and corrects object-dependent half-scan shading artifact.
- This advancement facilitates the application of half-scan reconstruction in quantitative temporal studies, balancing dose reduction with accuracy.