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Radiological Investigation II: MRI and Ventilation Perfusion Scan01:30

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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...
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A clinically-recommended MR whole lung imaging protocol using free-breathing 3D isotropic zero echo time sequence.

Qiuxi Lin1, Cheng Cheng1,2, Yingying Bao1

  • 1Department of Radiology, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510120, China.

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|July 29, 2024
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Summary

Free-breathing 3D isotropic zero echo time (ZTE) whole-lung MRI is feasible for chest imaging. Axial or sagittal ZTE acquisition protocols offer better image quality and are recommended for clinical practice.

Keywords:
LungMagnetic resonance imagingShort T2 imagingZero TEZero echo time imaging

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Area of Science:

  • Radiology
  • Medical Imaging
  • Pulmonary Imaging

Background:

  • Magnetic Resonance Imaging (MRI) offers a radiation-free alternative for lung imaging.
  • Zero Echo Time (ZTE) techniques enable imaging of lung parenchyma, which is challenging with conventional MRI.

Purpose of the Study:

  • To evaluate the feasibility and image quality of free-breathing 3D isotropic ZTE whole-lung MRI.
  • To identify optimal acquisition parameters for a clinically applicable MR lung imaging protocol.

Main Methods:

  • Thirty healthy volunteers underwent free-breathing 3D isotropic ZTE pulmonary scans with varying acquisition planes and number of excitations (NEX).
  • Radiologists assessed image quality, intrapulmonary structure visibility, and signal-to-noise ratio (SNR).
  • Preliminary comparison with CT was performed in three patients with interstitial lung disease.

Main Results:

  • Good to excellent overall image quality was achieved in healthy subjects.
  • Pulmonary arteries and bronchi were visualized up to the 7th and 5th generation, respectively.
  • Axial and sagittal acquisitions demonstrated superior image quality and visibility of pulmonary arteries and lung fissures compared to coronal acquisition.

Conclusions:

  • Free-breathing pulmonary ZTE MRI is a feasible alternative for chest imaging.
  • Axial or sagittal ZTE acquisition protocols are recommended for clinical implementation due to superior image quality.