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Bühler L, Enderle MD, Kahn N, Polke M, Schneider MA, Heußel CP, Herth FJF, Linzenbold W. Establishment of a Tissue-Mimicking Surrogate for Pulmonary Lesions to Improve the Development of RFA Instruments and Algorithms. Biomedicines 2022; 10:biomedicines10051100. [PMID: 35625838 PMCID: PMC9138808 DOI: 10.3390/biomedicines10051100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Revised: 05/05/2022] [Accepted: 05/07/2022] [Indexed: 01/27/2023] Open
Abstract
(1) Development of radiofrequency ablation (RFA) systems for pulmonary lesions is restricted by availability of human tumor specimens and limited comparability of animal tissue. We aimed to develop a new surrogate tissue overcoming these drawbacks. (2) Reference values for electrical impedance in lung tumor tissue were collected during routine lung tumor RFA (n = 10). Subsequently, a tissue-mimicking surrogate with comparable electrical impedance and facilitating detection of the ablation margins was developed. (3) The mean electrical impedance for all patients was 103.5 ± 14.7 Ω. In the optimized surrogate tissue model consisting of 68% agar solution, 23% egg yolk, 9% thermochromic ink, and variable amounts of sodium chloride, the mean electrical impedance was adjustable from 74.3 ± 0.4 Ω to 183.2 ± 5.6 Ω and was a function (y = 368.4x + 175.2; R2 = 0.96; p < 0.001) of sodium chloride concentration (between 0 and 0.3%). The surrogate tissue achieved sufficient dimensional stability, and sample cuts revealed clear margins of color change for temperatures higher 60 °C. (4) The tissue-mimicking surrogate can be adapted to lung tumor with respect to its electrical properties. As the surrogate tissue allows for simple and cost-effective manufacturing, it is suitable for extensive laboratory testing of RFA systems for pulmonary ablation.
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Affiliation(s)
- Louisa Bühler
- Erbe Elektromedizin GmbH, 72072 Tübingen, Germany; (L.B.); (M.D.E.)
| | | | - Nicolas Kahn
- Department of Pneumology and Respiratory Care Medicine, Thoraxklinik at Heidelberg University Hospital, 69126 Heidelberg, Germany; (N.K.); (M.P.); (F.J.F.H.)
- Translational Lung Research Center Heidelberg (TLRC), Member of the German Center for Lung Research (DZL), University of Heidelberg, 69120 Heidelberg, Germany; (M.A.S.); (C.P.H.)
| | - Markus Polke
- Department of Pneumology and Respiratory Care Medicine, Thoraxklinik at Heidelberg University Hospital, 69126 Heidelberg, Germany; (N.K.); (M.P.); (F.J.F.H.)
- Translational Lung Research Center Heidelberg (TLRC), Member of the German Center for Lung Research (DZL), University of Heidelberg, 69120 Heidelberg, Germany; (M.A.S.); (C.P.H.)
| | - Marc A. Schneider
- Translational Lung Research Center Heidelberg (TLRC), Member of the German Center for Lung Research (DZL), University of Heidelberg, 69120 Heidelberg, Germany; (M.A.S.); (C.P.H.)
- Translational Research Unit, Thoraxklinik at Heidelberg University Hospital, 69126 Heidelberg, Germany
| | - Claus Peter Heußel
- Translational Lung Research Center Heidelberg (TLRC), Member of the German Center for Lung Research (DZL), University of Heidelberg, 69120 Heidelberg, Germany; (M.A.S.); (C.P.H.)
- Department of Diagnostic and Interventional Radiology, Heidelberg University Hospital, 69120 Heidelberg, Germany
- Department of Diagnostic and Interventional Radiology with Nuclear Medicine, Thoraxklinik at Heidelberg University Hospital, 69126 Heidelberg, Germany
| | - Felix J. F. Herth
- Department of Pneumology and Respiratory Care Medicine, Thoraxklinik at Heidelberg University Hospital, 69126 Heidelberg, Germany; (N.K.); (M.P.); (F.J.F.H.)
- Translational Lung Research Center Heidelberg (TLRC), Member of the German Center for Lung Research (DZL), University of Heidelberg, 69120 Heidelberg, Germany; (M.A.S.); (C.P.H.)
| | - Walter Linzenbold
- Erbe Elektromedizin GmbH, 72072 Tübingen, Germany; (L.B.); (M.D.E.)
- Correspondence: ; Tel.: +49-7071-755-2896
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