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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 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...
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...

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Related Experiment Video

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Dual-phase Cone-beam Computed Tomography to See, Reach, and Treat Hepatocellular Carcinoma during Drug-eluting Beads Transarterial Chemo-embolization
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Dual-phase Cone-beam Computed Tomography to See, Reach, and Treat Hepatocellular Carcinoma during Drug-eluting Beads Transarterial Chemo-embolization

Published on: December 2, 2013

Technological approaches to in-room CBCT imaging.

M F Steinke1, E Bezak

  • 1Department of Physics and Astronomy, University of Heidelberg, Germany. m.steinke@stud.uni-heidelberg.de

Australasian Physical & Engineering Sciences in Medicine
|October 25, 2008
PubMed
Summary

Cone-Beam Computed Tomography (CBCT) offers 3D imaging for radiation therapy guidance, but increases secondary cancer risk due to additional imaging dose. This paper compares CBCT performance, dose, and image quality for IGRT and ART.

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Clinical Imaging of Microwave Mammography
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Clinical Imaging of Microwave Mammography

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Clinical Imaging of Microwave Mammography
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Clinical Imaging of Microwave Mammography

Published on: November 14, 2025

Area of Science:

  • Medical Physics
  • Radiotherapy Technology
  • Diagnostic Imaging

Background:

  • Cone-Beam Computed Tomography (CBCT) is increasingly utilized in Image-Guided Radiation Therapy (IGRT).
  • Advances in Flat-Panel Imager (FPI) technology enable linac-mounted 3D CBCT.
  • Daily/weekly CBCT imaging allows for treatment adaptation based on tumor motion.

Purpose of the Study:

  • To compare performance characteristics of kV-CBCT and MV-CBCT systems.
  • To evaluate additional imaging dose and image quality of different CBCT solutions.
  • To outline CBCT applications in IGRT and Adaptive Radiotherapy (ART).

Main Methods:

  • Comparative analysis of kV-CBCT and MV-CBCT systems from Elekta, Siemens, and Varian.
  • Assessment of additional imaging dose associated with CBCT acquisition.
  • Evaluation of image quality metrics for different CBCT platforms.
  • Review of CBCT applications in IGRT and ART, including comparisons with helical MV-CT and in-room CT.

Main Results:

  • CBCT imaging provides 3D data for precise radiation delivery.
  • Increased imaging frequency raises concerns about additional radiation dose and secondary cancer risk.
  • Performance varies across different CBCT manufacturers (Elekta, Siemens, Varian).

Conclusions:

  • CBCT is a valuable tool for IGRT and ART, enabling treatment adjustments.
  • Careful consideration of imaging dose is crucial to mitigate risks.
  • Further research and technological advancements are needed to optimize CBCT for clinical use.