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Related Concept Videos

Computed Tomography01:10

Computed Tomography

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.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
Imaging Studies III: Computed Tomography01:27

Imaging Studies III: Computed Tomography

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...
Electron Microscope Tomography and Single-particle Reconstruction01:07

Electron Microscope Tomography and Single-particle Reconstruction

Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...
Imaging Studies I: CT and MRI01:14

Imaging Studies I: CT and MRI

Introduction: MRI and CT scans are crucial advancements in medical imaging techniques, playing a vital role in diagnosing conditions related to the gastrointestinal (GI) system. Each scan serves distinct purposes, targets specific areas, and requires unique nursing duties.
Description of the Procedures
Computed Tomography (CT) scan:
Computed Tomography (CT) scans use X-ray technology to generate detailed images of bones, organs, and tissues. During the scan, the patient lies on a moving table...

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Related Experiment Video

Updated: Jun 4, 2026

Protocol for the Evaluation of MRI Artifacts Caused by Metal Implants to Assess the Suitability of Implants and the Vulnerability of Pulse Sequences
08:19

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Published on: May 17, 2018

Evaluation of two iterative techniques for reducing metal artifacts in computed tomography.

F Edward Boas1, Dominik Fleischmann

  • 1Department of Radiology, Stanford University Medical Center, 300 Pasteur Dr, Room H-1307, Stanford, CA 94305, USA. boas@stanford.edu

Radiology
|March 2, 2011
PubMed
Summary

The metal deletion technique (MDT) significantly reduces metal artifacts in CT scans, offering superior image quality compared to other methods. This technique reveals important clinical information often obscured by artifacts.

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Area of Science:

  • Medical Imaging
  • Radiology
  • Image Reconstruction

Background:

  • Metal artifacts are a common problem in computed tomography (CT) imaging.
  • Existing methods like filtered back projection (FBP) and linear interpolation (LI) have limitations in artifact reduction.

Purpose of the Study:

  • To evaluate the metal deletion technique (MDT) and selective algebraic reconstruction technique (SART) for reducing metal artifacts in CT.
  • To compare MDT and SART against FBP and LI.

Main Methods:

  • Simulated projection data from a phantom and retrospective clinical CT data with metal artifacts were used.
  • Scans were reconstructed using FBP, LI, SART, and MDT.
  • Quantitative evaluation of simulated data and qualitative evaluation by blinded radiologists of clinical data were performed.

Main Results:

  • MDT effectively reduced artifacts from photon starvation, beam hardening, and motion without introducing new streaks.
  • MDT demonstrated the lowest average error in simulated data and achieved the best image quality in 100% of clinical scans.
  • MDT revealed potentially important clinical information not visible with other methods.

Conclusions:

  • The metal deletion technique (MDT) provides superior image quality and significantly reduces metal streak artifacts compared to FBP, LI, and SART.
  • MDT is a valuable technique for improving CT image quality in the presence of metal implants.