English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

In dual-energy computed tomography (DECT), low- and high- kVp data arecollected often over a full-angular range (FAR) of $360^\circ$. While thereexists strong interest in DECT with low- and high-kVp data acquired overlimited-angular ranges (LARs), there remains little investigation of imagereconstruction in DECT with LAR data. Objective: We investigate imagereconstruction with minimized LAR artifacts from low- and high-kVp data overLARs of $\le 180^\circ$ by using a directional-total-variation (DTV) algorithm.Methods: Image reconstruction from LAR data is formulated as a convexoptimization problem in which data-$\ell_2$ is minimized with constraints onimage's DTVs along orthogonal axes. We then achieve image reconstruction byapplying the DTV algorithm to solve the optimization problem. We conductnumerical studies from data generated over arcs of LARs, ranging from$14^\circ$ to $180^\circ$, and perform visual inspection and quantitativeanalysis of images reconstructed. Results: Monochromatic images of interestobtained with the DTV algorithm from LAR data show substantially reducedartifacts that are observed often in images obtained with existing algorithms.The improved image quality also leads to accurate estimation of physicalquantities of interest, such as effective atomic number and iodine-contrastconcentration. Conclusion: Our study reveals that from LAR data of low- andhigh-kVp, monochromatic images can be obtained that are visually, and physicalquantities can be estimated that are quantitatively, comparable to thoseobtained in FAR DECT. Significance: As LAR DECT is of high practicalapplication interest, the results acquired in the work may engender insightsinto the design of DECT with LAR scanning configurations of practicalapplication significance.

Dual-energy CT imaging with limited-angular-range data