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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...
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 1, 2026

Reliability of Artificial Intelligence-Based Cone Beam Computed Tomography Integration with Digital Dental Images
05:49

Reliability of Artificial Intelligence-Based Cone Beam Computed Tomography Integration with Digital Dental Images

Published on: February 23, 2024

Crescent artifacts in cone-beam CT.

William Giles1, James Bowsher, Hao Li

  • 1Medical Physics Graduate Program, Duke University, Durham, North Carolina 27710, USA. william.giles@duke.edu

Medical Physics
|June 2, 2011
PubMed
Summary
This summary is machine-generated.

Small geometric deviations in cone-beam CT imaging cause crescent artifacts. Angle-dependent blank projections effectively mitigate these artifacts in radiation therapy, improving image quality.

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Area of Science:

  • Medical Physics
  • Radiological Imaging
  • Radiation Oncology

Background:

  • Cone-beam CT (CBCT) is crucial for image-guided radiation therapy (IGRT) target localization.
  • Crescent artifacts are common in CBCT images, potentially affecting treatment accuracy.
  • Understanding artifact origins is vital for improving CBCT image quality.

Purpose of the Study:

  • Investigate the causes of dark and light crescent artifacts in CBCT.
  • Develop and evaluate a technique to mitigate these artifacts.

Main Methods:

  • Simulated geometric deviations (bowtie filter sag, x-ray tube sag, rotation) to identify artifact causes.
  • Acquired angle-dependent blank projections for artifact correction.
  • Evaluated correction effectiveness using varying numbers of blank projections in phantom and patient studies.

Main Results:

  • Simulated deviations of 0.5-5 mm or 0.1 degrees reproduced crescent artifacts.
  • Root-mean-square error significantly reduced from 8.91 x 10(-4) to 5.25 x 10(-7) with 380 blank projections.
  • Phantom and patient studies demonstrated substantial mitigation of crescent artifacts using the proposed method.

Conclusions:

  • Minor geometric inaccuracies, particularly with bowtie filter gradients, cause significant crescent artifacts.
  • Incorporating angle-dependent blank projections effectively reduces these artifacts in CBCT imaging.