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Related Concept Videos

Radiological Investigation II: MRI and Ventilation Perfusion Scan01:30

Radiological Investigation II: MRI and Ventilation Perfusion Scan

Description
Magnetic Resonance Imaging (MRI) and Ventilation Perfusion Scans are two radiological investigations that offer detailed diagnostic images of the body, particularly lung structures.
MRI
MRI uses magnetic fields and radiofrequency signals to distinguish between normal and abnormal tissues. This technology provides a more detailed diagnostic image than CT scans, enabling it to characterize pulmonary nodules, stage bronchogenic carcinoma, and evaluate inflammatory activity in...
Computed Tomography01:10

Computed Tomography

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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Related Experiment Video

Updated: Jun 25, 2026

Monitoring Lung Function with Electrical Impedance Tomography in the Intensive Care Unit
05:56

Monitoring Lung Function with Electrical Impedance Tomography in the Intensive Care Unit

Published on: September 6, 2024

Detecting regional overdistention during mechanical ventilation using 4-dimensional computed tomography.

Yong Song1, David Trevascus2,3, Melissa Preissner2,3

  • 1Menzies Institute for Medical Research, College of Health and Medicine, University of Tasmania, Hobart, TAS, Australia.

Scientific Reports
|June 23, 2026
PubMed
Summary
This summary is machine-generated.

Four-dimensional CT imaging revealed regional lung overdistention during mechanical ventilation (MV), especially with low tidal volume and zero positive end-expiratory pressure. This highlights the limitations of global analysis in preventing ventilator-induced lung injury (VILI).

Keywords:
Lung imagingMechanical ventilationOverdistentionVentilator-induced lung injuryX-ray velocimetry

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3D Cine Magnetic Resonance Imaging of Respiratory Motion in Mechanically Ventilated Mice and Rats
08:22

3D Cine Magnetic Resonance Imaging of Respiratory Motion in Mechanically Ventilated Mice and Rats

Published on: September 19, 2025

Area of Science:

  • Pulmonary Medicine
  • Medical Imaging
  • Critical Care

Background:

  • Mechanical ventilation (MV) is essential for respiratory support but can cause ventilator-induced lung injury (VILI).
  • Global pressure-volume (PV) loop analysis is limited in detecting regional lung heterogeneity, a key factor in VILI.
  • Pre-existing lung injury can exacerbate VILI, making regional assessment crucial.

Purpose of the Study:

  • To evaluate regional lung mechanics, specifically overdistention and cyclic collapse, using advanced imaging techniques.
  • To compare regional lung mechanics with global assessments under different MV protocols.
  • To demonstrate the utility of four-dimensional computed tomography (4DCT) in identifying subtle regional mechanical stress.

Main Methods:

  • Utilized four-dimensional computed tomography (4DCT) and propagation-based phase-contrast X-ray imaging in a mouse model.
  • Subjected mice to four distinct MV protocols with varied peak inspiratory pressure and positive end-expiratory pressure.
  • Performed regional pressure-volume (PV) loop analysis to assess lung mechanics.

Main Results:

  • Regional PV loop analysis detected significant overdistention in low tidal volume settings, not evident in global PV loops.
  • The low tidal volume and zero PEEP (LVZP) group showed markedly higher regional overdistention indices compared to global measurements.
  • No significant differences were found in global versus regional lung collapse metrics.

Conclusions:

  • 4DCT is valuable for detecting subtle regional mechanical stress and heterogeneity during mechanical ventilation.
  • Global assessments are insufficient for identifying overdistention, particularly in specific ventilation strategies like LVZP.
  • Integrating regional lung mechanics metrics into MV strategies can enhance lung protection and reduce VILI risk.