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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...
Imaging Studies for Cardiovascular System V: CT01:28

Imaging Studies for Cardiovascular System V: CT

Cardiac computed tomography (CT) scanning is an advanced cardiac imaging technique that utilizes CT technology, with or without intravenous (IV) contrast, to produce accurate cross-sectional virtual slices of specific areas of the heart, coronary circulation, and major blood vessels such as the aorta, pulmonary veins, and arteries. The computer processes these slices to generate three-dimensional images. Multidetector CT (MDCT) is a rapid form of CT scanning that captures multiple slices...
Radiological Investigation I: X-ray and CT01:30

Radiological Investigation I: X-ray and CT

Radiological investigations, including X-rays and computed tomography (CT) scans, are critical for diagnosing and evaluating various medical conditions. These imaging techniques provide valuable insights into the body's internal structures, aiding in the detection of abnormalities, assessment of disease progression, and development of treatment strategies. This article delves into two primary radiological investigations, chest X-rays and CT scans, outlining their purpose, procedures, and the...

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Updated: May 15, 2026

Image Rendering Techniques in Postmortem Computed Tomography: Evaluation of Biological Health and Profile in Stranded Cetaceans
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Image Rendering Techniques in Postmortem Computed Tomography: Evaluation of Biological Health and Profile in Stranded Cetaceans

Published on: September 27, 2020

Iterative reconstruction techniques for computed tomography Part 1: technical principles.

Martin J Willemink1, Pim A de Jong, Tim Leiner

  • 1Department of Radiology, Utrecht University Medical Center, PO Box 85500, E01.132, 3508 GA, Utrecht, The Netherlands. m.willemink@umcutrecht.nl

European Radiology
|January 15, 2013
PubMed
Summary
This summary is machine-generated.

Iterative reconstruction (IR) for computed tomography (CT) reduces image noise and artifacts, potentially lowering radiation dose while maintaining image quality. However, IR may increase computation time and cause blotchy images.

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Area of Science:

  • Medical Imaging
  • Radiology
  • Computed Tomography

Background:

  • Iterative reconstruction (IR) is an advanced image processing technique for computed tomography (CT).
  • Traditional filtered back-projection (FBP) methods have limitations in noise and artifact reduction.

Purpose of the Study:

  • To explain the technical principles and differences of commercially available IR algorithms for CT.
  • To present IR in non-mathematical terms for radiologists and clinicians.

Main Methods:

  • Distilled technical details of proprietary IR techniques from scientific literature and manufacturer white papers.
  • Verified technical details with manufacturers.
  • Conducted a literature search (January 2006-January 2012) for clinical results of IR in CT.

Main Results:

  • IR iteratively reduces noise and artifacts in CT images.
  • Reported radiation dose reductions ranged from 23% to 76% compared to FBP.
  • Image quality, including noise and artifacts, was preserved with IR.

Conclusions:

  • IR technology for CT can reduce radiation dose while preserving image quality.
  • Disadvantages include potential blotchy image appearance and longer computational time.
  • Further research is needed on clinical differences between IR algorithms for low-dose CT.