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Related Concept Videos

Respiratory Volumes01:15

Respiratory Volumes

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Respiratory volumes are crucial metrics, meticulously measured to quantify the air exchanged in and out of the lungs during various phases of the breathing cycle. These precise measurements are vital for assessing lung function, diagnosing respiratory conditions, and monitoring overall respiratory health. Each parameter provides specific insights into the mechanics of breathing and the functional capacity of the lungs.
Tidal Volume (TV) Tidal volume (TV) is the air inhaled or exhaled in a...
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Radiological Investigation II: MRI and Ventilation Perfusion Scan01:30

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Breathing, otherwise known as pulmonary ventilation, is the process of air movement into and out of the lungs. The main mechanisms propelling pulmonary ventilation are atmospheric pressure (Patm), intra-pulmonary (Ppul ) or intra-alveolar pressure (Palv) within the alveoli, and intrapleural pressure (Pip) within the pleural cavity.
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Updated: May 13, 2025

Measurement of the Pressure-volume Curve in Mouse Lungs
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Effects of Intra-patient Lung Volume Variability on CT-Based Emphysema Quantification: A Virtual Imaging Study.

Amar Kavuri1, W Paul Segars1, Xiaoming Xu2

  • 1Center for Virtual Imaging Trials, Carl E. Ravin Advanced Imaging Laboratories, Department of Radiology, Duke University, Durham, North Carolina (A.K., W.P.S., H.P.M., E.S., E.A.).

Academic Radiology
|May 10, 2025
PubMed
Summary
This summary is machine-generated.

Lung volume variability significantly impacts emphysema quantification consistency on CT scans. A virtual imaging trial found physiological total lung volume (TLV) correction effectively reduces these volume-dependent errors in emphysema assessment.

Keywords:
CT imagingEmphysemaImaging biomarkerRespirationXCAT phantoms

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Area of Science:

  • Pulmonary Imaging and Diagnostics
  • Computational Modeling in Medicine
  • Radiomics and Quantitative Imaging

Background:

  • Computed tomography (CT) scans are crucial for diagnosing and quantifying emphysema.
  • Variability in patient lung volume during CT acquisition affects measurement consistency.
  • Ethical constraints and radiation risks limit studies requiring repeated patient imaging at different lung volumes.

Purpose of the Study:

  • To isolate and quantify the impact of lung volume variability on CT-based emphysema measurements.
  • To evaluate the effectiveness of different total lung volume (TLV) correction methods in mitigating these variabilities.
  • To utilize a virtual imaging trial approach to overcome limitations of human subject studies.

Main Methods:

  • Creation of 20 emphysema human models at varying inspiration levels (70%-100% full inspiration).
  • Generation of simulated CT images using a scanner-specific simulator (DukeSim).
  • Computation of emphysema biomarkers (LAA-950, Perc15) and global lung density; analysis using linear mixed-effects models with physiological and statistical TLV correction.

Main Results:

  • Inspiration level significantly affected LAA-950 and Perc15 measurements (p<0.001).
  • LAA-950 underestimated emphysema by 1.44±0.32% per liter deviation from full inspiration.
  • Perc15 underestimated severity by 1.16±0.02% per 1% lower lung volume; TLV correction methods reduced these deviations.

Conclusions:

  • Virtual imaging trials effectively isolate lung volume variability's impact on emphysema quantification.
  • Physiological model-based TLV correction is superior to statistical models for mitigating volume-dependent variability.
  • This study demonstrates a novel investigation method not feasible with human subjects or simple phantoms.