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X-ray scatter correction for multi-source interior computed tomography.
1Department of Biomedical Engineering and Mechanics, Virginia Polytechnic Institute and State University, Blacksburg, VA, 24061, USA.
Medical Physics
|January 20, 2017
Summary
Multi-source interior computed tomography (CT) imaging is challenged by cross-scattered X-rays, degrading image quality. New scatter correction methods, including beam-stopper-array (BSA) and source-trigger-sequence (STS), significantly improve image quality in multi-source interior CT.
Area of Science:
- Medical Imaging
- Computed Tomography (CT)
- X-ray Scattering Physics
Background:
- Multi-source interior computed tomography (CT) offers potential for ultra-fast, low-dose dynamic imaging.
- Simultaneous X-ray sources in multi-source CT can lead to forward and cross-scattered radiation, degrading image quality.
- Existing scatter correction methods may not fully address the complexities of multi-source interior CT architectures.
Purpose of the Study:
- To investigate the impact of X-ray scattering artifacts in a multi-source interior CT architecture.
- To evaluate the combined effects of forward and cross-scattering from multiple simultaneous X-ray sources.
- To develop and validate novel scatter correction techniques for multi-source interior CT.
Main Methods:
- Evaluated scatter artifacts using numerical simulations (Monte Carlo with CATphan® 600 phantom) and physical experiments (custom phantom).
- Compared scattering effects in single-source global CT, multi-source global CT, and multi-source interior CT modes.
- Developed and tested two scatter correction methods: a beam-stopper-array (BSA) for simultaneous forward and cross-scatter correction, and a source-trigger-sequence (STS) for cross-scatter correction.
Main Results:
- Cross-scattering significantly degraded image quality, reducing contrast-to-noise ratio (CNR) by up to 68.5% (simulation) and 50.7% (experiments) in multi-source interior CT.
- The BSA method effectively reduced both forward and cross-scattering, improving CNR and CT number accuracy.
- The STS method corrected cross-scattering, enabling image quality comparable to single-source interior CT; remaining forward scatter was addressed with FASKS, reducing CT number error to <37 HU.
Conclusions:
- Cross-scattering is a significant artifact in multi-source interior CT, alongside forward scattering, impacting image quality.
- The proposed BSA and STS scatter correction methods substantially enhance image quality in multi-source interior CT.
- These advancements enable improved diagnostic accuracy and image fidelity in advanced CT imaging applications.
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