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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...
Positron Emission Tomography01:29

Positron Emission Tomography

Positron emission tomography (PET) is a medical imaging technique involving radiopharmaceuticals — substances that emit short-lived radiation. Although the first PET scanner was introduced in 1961, it took 15 more years before radiopharmaceuticals were combined with the technique and revolutionized its potential.
One of the main requirements of a PET scan is a positron-emitting radioisotope, which is produced in a cyclotron and then attached to a substance used by the part of the body being...

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Tracking the Mammary Architectural Features and Detecting Breast Cancer with Magnetic Resonance Diffusion Tensor Imaging
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Experimentally determined spectral optimization for dedicated breast computed tomography.

Nicolas D Prionas1, Shih-Ying Huang, John M Boone

  • 1Department of Radiology University of California Davis Medical Center, 4860 Y Street, Suite 3100 Sacramento, California 95817, USA.

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

Optimizing dedicated breast computed tomography (bCT) with 60 kVp and 0.2 mm copper filtration maximizes contrast for iodine-enhanced lesions and microcalcifications. This technique also improves soft-tissue contrast for better breast cancer detection.

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Area of Science:

  • Medical Imaging
  • Radiology
  • Biomedical Engineering

Background:

  • Dedicated breast computed tomography (bCT) offers advanced imaging capabilities for breast cancer detection.
  • Optimizing imaging parameters is crucial for maximizing diagnostic accuracy in bCT.

Purpose of the Study:

  • To determine optimal x-ray tube potential and filtration for maximizing soft-tissue, microcalcification, and iodine contrast in bCT.
  • To assess the accuracy of phantom materials as breast tissue surrogates in bCT.

Main Methods:

  • Cadaveric breast specimens with inserted phantoms (iodine, calcium hydroxyapatite, polyethylene, water) were scanned using a prototype bCT scanner.
  • Six x-ray tube potentials (50-100 kVp) and three filters (0.2 mm Cu, 1.5 mm Al, 0.2 mm Sn) were evaluated.
  • Intensity, noise, and dose-normalized contrast-to-noise ratio (CNRD) were measured; regression models analyzed technique factor effects.

Main Results:

  • Maximum iodine contrast enhancement and microcalcification contrast were achieved at 60 kVp with 0.2 mm Cu filtration.
  • 60 kVp also maximized soft-tissue contrast.
  • The 0.2 mm Cu filter yielded significantly higher CNRD for iodine contrast compared to other filters.

Conclusions:

  • Contrast-enhanced bCT can be optimized at 60 kVp with 0.2 mm Cu filtration for enhanced lesion visibility.
  • Lower tube potentials (60 kVp) benefit soft-tissue and microcalcification contrast.
  • Phantom material accuracy for dosimetry and quality assurance was evaluated, providing guidance for bCT protocols.