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Phase Contrast and Differential Interference Contrast Microscopy01:26

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In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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Most bones contain compact and spongy osseous tissue, but their distribution and concentration vary based on the bone's overall function.
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A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
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Determining the optimal dose size and dosing frequency in pharmacotherapy is crucial for achieving therapeutic effectiveness while minimizing adverse effects. This article explores the methodologies employed in determining these parameters, focusing on their significance and interplay to tailor dosing regimens.Dose Size: Dose size refers to the amount of a drug administered in a single dose. It is determined based on the drug's pharmacodynamics and pharmacokinetics properties and...
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Dose-compatible grating-based phase-contrast mammography on mastectomy specimens using a compact synchrotron source.

Elena Eggl1,2, Susanne Grandl3, Anikό Sztrόkay-Gaul3

  • 1Chair of Biomedical Physics, Department of Physics, Technical University of Munich, James-Franck-Straße 1, 85748, Garching, Germany. elena.eggl@ph.tum.de.

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New synchrotron X-ray techniques improve breast cancer diagnosis accuracy. These methods offer enhanced imaging for inconclusive mammograms, potentially reducing unnecessary follow-up examinations and improving patient outcomes.

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Area of Science:

  • Medical Imaging
  • Biophysics
  • Radiology

Background:

  • Screening mammography has reduced breast cancer mortality but often yields inconclusive results, leading to further testing.
  • Phase-sensitive X-ray techniques show promise for improving diagnostic accuracy but face dose limitations.

Purpose of the Study:

  • To evaluate dose-compatible grating-based phase-contrast and dark-field imaging using monochromatic X-rays from a compact synchrotron source.
  • To compare the diagnostic content of these new imaging techniques with conventional mammography.

Main Methods:

  • Acquisition of absorption, phase-contrast, and dark-field X-ray images using monochromatic X-rays from a compact inverse Compton scattering synchrotron source.
  • Imaging of mastectomy specimens and a phantom to assess diagnostic performance and contrast-to-noise ratio.
  • Comparison with ex-vivo clinical mammography images at comparable or lower radiation doses.

Main Results:

  • Grating-based phase-contrast and dark-field imaging provided improved diagnostic content compared to conventional mammography.
  • Monochromatic X-ray imaging demonstrated a higher contrast-to-noise ratio for a phantom compared to clinical images.
  • The developed techniques were compatible with lower or equal radiation doses.

Conclusions:

  • Compact synchrotron sources coupled with phase-sensitive X-ray imaging offer enhanced diagnostic capabilities for inconclusive mammograms.
  • These advanced imaging methods show potential as a clinical second-level examination for breast cancer diagnosis.
  • Further development could lead to reduced false-positive rates and improved patient management.