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Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
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DefinitionComputed Tomography (CT) of the genitourinary (GU) tract is a non-invasive imaging modality that utilizes X-rays and computer processing to generate detailed cross-sectional images of the urinary system, encompassing the kidneys, ureters, bladder, and adjacent structures such as the adrenal glands.PurposeCT scans of the GU tract serve several diagnostic and therapeutic purposes, including:Diagnosis of Urinary Tract Diseases: Detects kidney stones, tumors, cysts, and congenital...
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Missing wedge computed tomography by iterative algorithm DIRECTT.

Andreas Kupsch1, Axel Lange1, Manfred P Hentschel1

  • 1BAM Federal Institute for Materials Research and Testing, Berlin, Germany.

Journal of Microscopy
|September 15, 2015
PubMed
Summary
This summary is machine-generated.

A new algorithm, DIRECTT (Direct Iterative Reconstruction of Computed Tomography Trajectories), effectively reduces directional artefacts common in missing wedge computed tomography. This method enhances image quality in electron, X-ray, and neutron tomography applications.

Keywords:
Computed tomographyelectron tomographyimage morphologyiterative reconstructionmissing wedgereconstruction algorithm

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Area of Science:

  • * Image reconstruction and artifact reduction in computed tomography.
  • * Development and application of advanced tomographic algorithms.

Background:

  • * Missing wedge artifacts manifest as directional elongations in reconstructed tomographic data.
  • * These artifacts are particularly problematic in electron tomography and specialized X-ray/neutron tomography with limited angular data.
  • * Standard computed tomography (CT) methods do not typically encounter these specific directional artifacts.

Purpose of the Study:

  • * To present and evaluate a strategy for mitigating directional reconstruction artifacts in missing wedge computed tomography.
  • * To assess the efficacy of the DIRECTT algorithm in reducing these specific artifacts.
  • * To compare DIRECTT performance against traditional reconstruction techniques.

Main Methods:

  • * Investigation of the DIRECTT (Direct Iterative Reconstruction of Computed Tomography Trajectories) algorithm.
  • * Utilized isotropic substructures of metal foam and circular disc models to probe anisotropic artifact nature.
  • * Employed Fourier transforms for direct visualization of the missing wedge and length-weighted kernel density estimation for evaluating disc model reconstructions.

Main Results:

  • * The DIRECTT algorithm demonstrated significant reduction of directional artifacts compared to filtered backprojection and algebraic methods.
  • * Reconstruction quality was assessed across various signal-to-noise ratios using local and integral evaluation parameters.
  • * Fourier transforms effectively visualized the missing wedge, aiding in artifact assessment.

Conclusions:

  • * The DIRECTT algorithm offers a robust solution for mitigating directional artifacts in missing wedge computed tomography.
  • * This method improves image fidelity in tomographic applications with restricted angular sampling.
  • * The study provides a quantitative framework for evaluating reconstruction quality in the presence of such artifacts.