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Related Concept Videos

Radiological Investigation I: X-ray and CT01:30

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Radiological investigations, including X-rays and computed tomography (CT) scans, are critical for diagnosing and evaluating various medical conditions. These imaging techniques provide valuable insights into the body's internal structures, aiding in the detection of abnormalities, assessment of disease progression, and development of treatment strategies. This article delves into two primary radiological investigations, chest X-rays and CT scans, outlining their purpose, procedures, and...
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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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Related Experiment Video

Updated: Aug 5, 2025

Multi-modal Pulmonary Imaging: Using Complementary Information from CT and Hyperpolarized 129Xe MRI to Evaluate Lung Structure-Function
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High resolution propagation-based lung imaging at clinically relevant X-ray dose levels.

Jonas Albers1,2, Willi L Wagner3,4, Mascha O Fiedler4,5

  • 1Department for Diagnostic and Interventional Radiology, University Medical Center Goettingen, Goettingen, Germany.

Scientific Reports
|March 24, 2023
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Summary

Propagation-based imaging (PBI) offers high-resolution lung imaging at lower radiation doses than traditional computed tomography (CT). This advanced technique improves the detection of lung diseases, potentially reducing the need for invasive biopsies.

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Area of Science:

  • Medical Imaging
  • Radiology
  • Biophysics

Background:

  • Clinical computed tomography (CT) is limited in diagnosing microscopic lung diseases due to spatial resolution constraints tied to X-ray dose.
  • Many pulmonary conditions affect small lung structures, necessitating invasive biopsies for accurate diagnosis.
  • Idiopathic pulmonary fibrosis (IPF) and small pulmonary nodules are examples of conditions challenging for current CT.

Purpose of the Study:

  • To present technical refinements in propagation-based imaging (PBI) for enhanced lung pathology characterization.
  • To evaluate PBI's performance against clinical CT in terms of spatial resolution, dose efficiency, and image quality.
  • To explore PBI's potential for detailed lung perfusion analysis using iodine k-edge subtraction.

Main Methods:

  • Utilized a human-scale chest phantom with ventilated porcine lungs to mimic artificial lung pathologies.
  • Employed a very large propagation distance (10.7 m) and a high-resolution photon counting detector.
  • Compared image quality and dose efficiency of PBI-CT with state-of-the-art clinical CT using thermoluminescence detectors.

Main Results:

  • High-resolution PBI-CT demonstrated significantly improved dose efficiency compared to clinical CT.
  • PBI achieved superior image quality at equivalent or lower X-ray dose levels than clinical CT.
  • Combined PBI with iodine k-edge subtraction yielded high-quality iodine concentration maps for detailed lung perfusion analysis.

Conclusions:

  • Propagation-based imaging (PBI) offers a valuable, non-invasive tool for high-resolution 3D diagnosis of lung diseases.
  • PBI's improved dose efficiency and image quality can aid in diagnosing conditions like interstitial lung disease and IPF.
  • This technique may reduce the need for invasive lung biopsies, particularly for high-risk patients.