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Related Concept Videos

X-ray Imaging01:24

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German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with...
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The most common cardiovascular diagnostic test is an X-ray. It produces images of the heart, blood vessels, and adjacent structures.
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An X-ray, or radiograph, is a non-invasive method that uses ionizing radiation to take images of internal structures. It is mainly used in cardiac imaging to examine the heart, lungs, and major blood vessels, aiming to identify abnormalities in the heart's size, shape, and position, such as heart failure, congenital defects, and vascular...
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Related Experiment Video

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Contrast Enhanced Vessel Imaging using MicroCT
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Vessel imaging by interferometric phase-contrast X-ray technique.

Tohoru Takeda1, Atsushi Momose, Jin Wu

  • 1Institute of Clinical Medicine, University of Tsukuba, Tsukuba-shi, Ibaraki, Japan. ttakeda@md.tsukuba.ac.jp

Circulation
|April 10, 2002
PubMed
Summary
This summary is machine-generated.

Phase-contrast x-ray imaging clearly visualizes small vessels in soft tissues, offering superior detail compared to traditional methods. This technique uses physiological saline for enhanced imaging of vascular structures with low x-ray doses.

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Area of Science:

  • Medical Imaging
  • Biophysics
  • X-ray Optics

Background:

  • Phase-contrast x-ray imaging offers significantly higher sensitivity to low-atomic-number elements (H, C, N, O) compared to absorption-contrast methods.
  • Accurate imaging of vascular structures is crucial for understanding organ and tumor biology.
  • This study investigates selective angiography using phase contrast on physiological materials.

Purpose of the Study:

  • To evaluate the potential of phase-contrast x-ray imaging for selective angiography.
  • To compare the efficacy of phase-contrast imaging with absorption-contrast imaging for visualizing blood vessels.

Main Methods:

  • Phase-contrast x-ray imaging was conducted using a synchrotron x-ray source.
  • Differences in refractive index (ddelta) were measured for various physiological solutions and artificial blood.
  • Physiological saline was selected for vessel imaging due to its high contrast.

Main Results:

  • Phase-contrast x-ray imaging clearly depicted vessels larger than 0.03 mm in excised rat and rabbit liver.
  • Absorption-contrast x-ray imaging failed to reveal these small vessels.
  • Iodine microsphere contrast-enhanced absorption-contrast images only showed portal veins larger than 0.1 mm at a comparable x-ray dose.

Conclusions:

  • Phase-contrast x-ray imaging enables clear depiction of vessels using physiological saline.
  • The technique requires significantly lower x-ray doses for effective vascular imaging.