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Computed Tomography01:10

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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...
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Clinical Imaging of Microwave Mammography
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Spectrum optimization for computed radiography mammography systems.

Michael Figl1, Peter Homolka1, Friedrich Semturs2

  • 1Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Vienna, Austria.

Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)
|August 7, 2016
PubMed
Summary
This summary is machine-generated.

Optimizing anode/filter combinations and tube voltage in computed radiography (CR) mammography systems enhances image quality and reduces patient dose. This study demonstrates significant improvements in the figure-of-merit (FOM) for breast cancer screening.

Keywords:
Computed radiographyMammographyTechnical quality assurance

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Area of Science:

  • Medical Imaging
  • Radiology
  • Biomedical Engineering

Background:

  • Computed radiography (CR) systems are widely used in breast cancer screening programs.
  • Achieving optimal image quality and dose levels with CR mammography remains a challenge.
  • Powder plate CR systems require careful selection of X-ray spectra for effective screening.

Purpose of the Study:

  • To optimize anode/filter (A/F) combinations and tube voltages for mammographic CR systems.
  • To improve the figure-of-merit (FOM), balancing image quality and glandular dose.
  • To enhance technical quality assurance in breast screening protocols using CR.

Main Methods:

  • Investigated various anode/filter combinations across clinical tube voltage ranges.
  • Measured the figure-of-merit (FOM) defined as squared signal-difference-to-noise ratio divided by glandular dose.
  • Performed measurements using Siemens and GE mammography systems with different CR readers.

Main Results:

  • Optimal Mo/Rh spectrum identified between 27-29kVp for 50mm PMMA.
  • Superior FOM achieved with specific A/F and kVp settings for different phantom thicknesses.
  • Demonstrated FOM increases ranging from 10% to over 100% through optimization.

Conclusions:

  • Optimized A/F and tube voltage selection can reduce dose or improve image quality in CR mammography.
  • Tube voltage is crucial for systems with limited A/F choices.
  • This work demonstrates effective optimization of automatic exposure control (AEC) parameters for mammographic CR systems.