Abstract
Microdialysis can be used in parallel to deep brain stimulation (DBS) to relate biochemical changes to the clinical outcome. The aim of the study was to use the finite element method to predict the tissue volume of influence (TVImax) and its cross-sectional radius (r TVImax) when using brain microdialysis, and visualize the TVImax in relation to patient anatomy. An equation based on Fick’s law was used to simulate the TVImax. Factorial design and regression analysis were used to investigate the impact of the diffusion coefficient, tortuosity and loss rate on the r TVImax. A calf brain tissue experiment was performed to further evaluate these parameters. The model was implemented with pre-(MRI) and post-(CT) operative patient images for simulation of the TVImax for four patients undergoing microdialysis in parallel to DBS. Using physiologically relevant parameter values, the r TVImax for analytes with a diffusion coefficient D = 7.5 × 10−6 cm2/s was estimated to 0.85 ± 0.25 mm. The simulations showed agreement with experimental data. Due to an implanted gold thread, the catheter positions were visible in the post-operative images. The TVImax was visualized for each catheter. The biochemical changes could thereby be related to their anatomical origin, facilitating interpretation of results.
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Acknowledgements
The authors would like to thank Johan Richter, MD, and the staff at Neurosurgical Department of Linköping University Hospital for skillful help during the surgical procedure. The authors would also like to thank Mattias Åström, PhD and Johannes Johansson, PhD at the Department of Biomedical Engineering, for help with the simulations, Pontus Lindblom, MSc at the Department of Clinical and Experimental Medicine, for assistance with microscope software, and associate professor Eva Enqvist, Department of Mathematics, Linköping University, for valuable aid with the statistical design and analysis. The study was supported by the Swedish Governmental Agency for Innovation Systems (Vinnova), Swedish Foundation for Strategic Research (SSF), Swedish Research Council (VR) (Group grant no. 311-2006-7661), Research Foundation of the County Council of Östergötland, Medical Research Council of Southeast Sweden and Linköping University’s Foundation for Parkinson’s Research.
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Diczfalusy, E., Zsigmond, P., Dizdar, N. et al. A model for simulation and patient-specific visualization of the tissue volume of influence during brain microdialysis. Med Biol Eng Comput 49, 1459–1469 (2011). https://doi.org/10.1007/s11517-011-0841-0
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DOI: https://doi.org/10.1007/s11517-011-0841-0