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Related Concept Videos

Radiological Investigation III: Pulmonary Angiogram and PET Scan01:13

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Radiological investigations are paramount in the diagnosis and management of various pulmonary diseases. Two essential investigations are the Pulmonary Angiogram and the Positron Emission Tomography (PET) Scan.
Pulmonary Angiogram
A Pulmonary Angiogram is an invasive procedure involving injecting a contrast medium through a catheter threaded into the pulmonary artery or the right side of the heart to visualize the pulmonary vasculature. Computed Tomography (CT) scans have mainly replaced this...
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Three-Dimensional Phase Resolved Functional Lung Magnetic Resonance Imaging
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Quantifying spatial and dynamic lung abnormalities with 3D PREFUL FLORET UTE imaging: A feasibility study.

Filip Klimeš1,2, Joseph W Plummer3,4, Matthew M Willmering3,5,6

  • 1Institute of Diagnostic and Interventional Radiology, Hannover Medical School, Hannover, Germany.

Magnetic Resonance in Medicine
|January 18, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a new method for pulmonary MRI, enhancing ventilation analysis with improved spatial resolution and strong correlation to existing techniques. The developed pipeline may help detect lung disease airflow abnormalities.

Keywords:
FLORETPREFULUTEhyperpolarized 129Xe MRIlung MRImotion compensationventilation imaging

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Area of Science:

  • Pulmonary MRI
  • Medical Imaging Techniques
  • Ventilation Quantification

Background:

  • Pulmonary MRI faces challenges including low proton density, rapid signal decay, and motion artifacts.
  • The fermat-looped orthogonally encoded trajectories (FLORET) sequence offers high sampling efficiency and motion robustness.
  • Phase-resolved functional lung (PREFUL) MRI is a contrast-free method for assessing lung ventilation during free breathing.

Purpose of the Study:

  • To develop a reconstruction pipeline for FLORET UTE MRI.
  • To enhance spatial resolution for 3D PREFUL ventilation analysis.
  • To evaluate the efficacy of FLORET UTE in contrast-free lung ventilation assessment.

Main Methods:

  • FLORET sequence acquired data continuously over 7±2 min in 36 participants (7 healthy, 29 with pulmonary conditions).
  • Motion-compensated low-rank reconstruction was used for respiratory imaging.
  • A 3D PREFUL algorithm quantified static and dynamic ventilation surrogates, with comparisons to 129Xe MRI.

Main Results:

  • Optimal image sharpness and ventilation dynamics were achieved using 24 respiratory bins.
  • A strong correlation was observed between 3D PREFUL FLORET UTE VDPs and 129Xe VDPs (r≥0.61, p<0.0001).
  • Dynamic ventilation parameters in diseased patients showed greater heterogeneity and better alignment with 129Xe VDPs.

Conclusions:

  • The developed FLORET UTE MRI reconstruction pipeline improves spatial resolution.
  • This method shows strong correlation with 129Xe MRI, enabling dynamic ventilation quantification.
  • The technique may reveal airflow abnormalities in lung disease.