ArticleIEEE transactions on radiation and plasma medical sciences2023
Joint Estimation of Metal Density and Attenuation Maps with Pencil Beam XFET.
Article in IEEE transactions on radiation and plasma medical sciences, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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3 citing papers in PubMed.
- Contrast-to-noise ratio comparison between X-ray fluorescence emission tomography and computed tomography.Journal of medical imaging (Bellingham, Wash.) · 2024Article
- A High-Sensitivity Benchtop X-Ray Fluorescence Emission Tomography (XFET) System With a Full-Ring of X-Ray Imaging-Spectrometers and a Compound-Eye Collimation Aperture.IEEE transactions on medical imaging · 2024Article
- Effect of detector placement on joint estimation in X-ray fluorescence emission tomography.IEEE transactions on radiation and plasma medical sciences · 2024Article
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4 authors.
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Abstract
X-ray fluorescence emission tomography (XFET) is an emerging imaging modality that images the spatial distribution of metal without requiring biochemical modification or radioactivity. This work investigates the joint estimation of metal and attenuation maps with a pencil-beam XFET system that allows for direct metal measurement in the absence of attenuation. Using singular value decomposition on a simplified imaging model, we show that reconstructing metal and attenuation voxels far from the detector is an ill-conditioned problem. Using simulated data, we develop and compare two image reconstruction methods for joint estimation. The first method alternates between updating the attenuation map with a separable paraboloidal surrogates algorithm and updating the metal map with a closed-form solution. The second method performs simultaneous joint estimation with conjugate gradients based on a linearized imaging model. The alternating approach outperforms the linearized approach for iron and gold numerical phantom reconstructions. Reconstructing an (8 cm)
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