Abstract
Objective
Magnetic resonance imaging (MRI) of the lung remains challenging due to the low tissue density, susceptibility artefacts, unfavourable relaxation times and motion. Previously, we demonstrated in vivo that one-lung flooding (OLF) with saline is a viable and safe approach. This study investigates the feasibility of OLF in an MRI environment and evaluates the flooding process on MR images.
Methods
OLF of the left lung was performed on five animals using a porcine model. Before, during and after OLF, standard T2w and T1w spin-echo (SE) and gradient-echo (GRE) sequences were applied at 3 T.
Results
The procedure was successfully performed in all animals. On T1w MRI, the flooded lung appeared homogenous and isointense with muscle tissue. On T2w images, vascular structures were highly hypointense, while the bronchi were clearly demarcated with hypointense wall and hyperintense lumen. The anatomical demarcation of the flooded lung from the surrounding organs was superior on T2w images. No outflow effects were seen, and no respiration triggering was required.
Discussion
OLF can be safely performed in an MR scanner with highly detailed visualization of the pulmonary structures on T2w images. The method provides new approaches to MRI-based image-guided pulmonary interventions using the presented experimental model.
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Abbreviations
- CT:
-
Computed tomography
- ECG:
-
Electrocardiogram
- EPI:
-
Echo planar imaging
- FA:
-
Flip angle
- GRE:
-
Gradient echo
- HASTE:
-
Half-fourier acquisition single-shot turbo spin echo
- KCl:
-
Potassium chloride
- mAP:
-
Mean arterial pressure
- MRI:
-
Magnetic resonance imaging
- MRgFUS:
-
Magnetic resonance-guided focused ultrasound surgery
- OLF:
-
One-lung flooding
- PFC:
-
Perfluorocarbon
- PFH:
-
Perfluorohexane
- CO2 :
-
Carbon dioxide partial pressure
- pO2 :
-
Oxygen partial pressure
- PFC:
-
Perfluorocarbon liquids
- ROI:
-
Region of interest
- SAR:
-
Specific absorption rate
- SE:
-
Spin echo
- SO2 :
-
Oxygen saturation
- T:
-
Tesla
- TE:
-
Echo time
- TR:
-
Repetition time
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Authors and Affiliations
Contributions
FW, TGL and DG developed the study design and conception. Güllmar and Wolfram performed acquisition of MR data and statistics; HS, SB, and TGL performed care of animal and vital monitoring during OLF; JB, JRR and FW performed analysis and interpreting of data; JRR, JB, TGL and FW were drafting the manuscript.
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Conflict of interest
This research was supported by the Focused Ultrasound Surgery Foundation, Charlottesville, VA, USA (FUS325) and the SRH Waldklinikum Gera, Germany. The authors declare that they have no competing interests, neither financial nor non-financial.
Ethical standards
All national guidelines for care and use of animals were followed. Animal experiments were performed with permission from the Veterinary Department of the Thuringian State Authority for Food Protection and Fair Trading (TLLV Reg15-003/12) in compliance with the National Animal Protection Act.
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Wolfram, F., Güllmar, D., Böttcher, J. et al. Assessment of MR imaging during one-lung flooding in a large animal model. Magn Reson Mater Phy 32, 581–590 (2019). https://doi.org/10.1007/s10334-019-00759-x
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DOI: https://doi.org/10.1007/s10334-019-00759-x