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- W2312066036 abstract "Sequential CT studies present an excellent opportunity to apply prior-image-based reconstruction (PIBR) methods that leverage high-fidelityprior imaging studies to improve image quality and/or reduce x-ray exposure in subsequent studies. One major obstacle inusing PIBR is that the initial and subsequent studies are often performed on different scanners (e.g. diagnostic CT followed by CBCTfor interventional guidance); this results in mismatch in attenuation values due to hardware and software differences. While improvedartifact correction techniques can potentially mitigate such differences, the correction is often incomplete. Here, we present analternate strategy where the PIBR itself is used to mitigate these differences. We define a new penalty for the previously introducedPIBR called Reconstruction of Difference (RoD). RoD differs from many other PIBRs in that it reconstructs only changes in theanatomy (vs. reconstructing the current anatomy). Direct regularization of the difference image in RoD provides an opportunity toselectively penalize spatial frequencies of the difference image (e.g. low frequency differences associated with attenuation offsets andshading artifacts) without interfering with the variations in unchanged background image. We leverage this flexibility and introduce anovel regularization strategy using a generalized Fourier penalty within the RoD framework and develop the modified reconstructionalgorithm. We evaluate the performance of the new approach in both simulation studies and in physical CBCT test-bench data. Wefind that generalized Fourier penalty can be highly effective in reducing low-frequency x-ray artifacts through selective suppression ofspatial frequencies in the reconstructed difference image." @default.
- W2312066036 created "2016-06-24" @default.
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- W2312066036 date "2016-03-23" @default.
- W2312066036 modified "2023-09-23" @default.
- W2312066036 title "A generalized Fourier penalty in prior-image-based reconstruction for cross-platform imaging" @default.
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- W2312066036 doi "https://doi.org/10.1117/12.2216151" @default.
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