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MRI-Guided Radiofrequency Thermal Ablation of Normal Lung Tissue: In Vivo Study in a Rabbit Model

Frank K. Wacker1,2, Sherif G. Nour1, Rosana Eisenberg3, Jeffrey L. Duerk1 and Jonathan S. Lewin4

1 Department of Radiology, Case Western Reserve University, University Hospitals of Cleveland, 11100 Euclid Ave., Cleveland, OH 44106.
2 Present address: Department of Radiology, Charité-Universitätsmedizin Berlin, Campus Benjamin Franklin, Hindenburgdamm 30, Berlin 12203, Germany. Address
3 Department of Pathology, Case Western Reserve University, University Hospitals of Cleveland, Cleveland, OH 44106.
4 Department of Radiology, Johns Hopkins School of Medicine, The Johns Hopkins Hospital, 601 N Caroline St., Rm. 4210, Baltimore, MD 21287.



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  		Fig. 1A. —Pneumothorax detected during radiofrequency ablation of rabbit lung. Axial fast low-angle shot (FLASH) MR image shows good delineation between collapsed lung (arrow) and pleural air (star).

 


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  		Fig. 1B. —Pneumothorax detected during radiofrequency ablation of rabbit lung. FLASH MR image acquired 1 min after A shows totally collapsed lung (arrow).

 


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  		Fig. 1C. —Pneumothorax detected during radiofrequency ablation of rabbit lung. FLASH MR image shows that after needle insertion (arrow), suction was applied leading to reinflation of lung.

 


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  		Fig. 1D. —Pneumothorax detected during radiofrequency ablation of rabbit lung. Axial CT scan confirms reinflation of lung 30 min after therapy.

 


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  		Fig. 2A. —Radiofrequency ablation of rabbit lung tissue. Axial true fast imaging with steady-state free precession (FISP) image of rabbit chest shows 1-mL syringe filled with water that is used to mark entry point.

 


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  		Fig. 2B. —Radiofrequency ablation of rabbit lung tissue. Axial (B) and coronal (C) oblique fast low-angle shot images acquired immediately after radiofrequency energy application (4 min) show hyperintense thermal lesion.

 


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  		Fig. 2C. —Radiofrequency ablation of rabbit lung tissue. Axial (B) and coronal (C) oblique fast low-angle shot images acquired immediately after radiofrequency energy application (4 min) show hyperintense thermal lesion.

 


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  		Fig. 2D. —Radiofrequency ablation of rabbit lung tissue. Axial STIR image shows hyperintense rim and hypointense center of lesion.

 


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  		Fig. 2E. —Radiofrequency ablation of rabbit lung tissue. Axial reverse FISP image has poor spatial resolution but good lesion contrast.

 


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  		Fig. 2F. —Radiofrequency ablation of rabbit lung tissue. Axial CT image acquired 20 min after radiofrequency energy application shows high-attenuating ovoid thermal lesion.

 


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  		Fig. 2G. —Radiofrequency ablation of rabbit lung tissue. Photograph of gross specimen shows that radiofrequency lesion is well visualized.

 

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