Fast conductivity imaging in magnetic resonance electrical impedance tomography (MREIT) for RF ablation monitoring
| العنوان: | Fast conductivity imaging in magnetic resonance electrical impedance tomography (MREIT) for RF ablation monitoring |
|---|---|
| المؤلفون: | Munish Chauhan, Hyung Joong Kim, Woo Chul Jeong, Hun Wi, Eung Je Woo, Tong In Oh, Oh In Kwon |
| المصدر: | International Journal of Hyperthermia. 30:447-455 |
| بيانات النشر: | Informa UK Limited, 2014. |
| سنة النشر: | 2014 |
| مصطلحات موضوعية: | Cancer Research, Materials science, Radio Waves, Physiology, Radiofrequency ablation, Phase (waves), Pulse sequence, Conductivity, Magnetic Resonance Imaging, law.invention, Magnetic field, Cross-Sectional Studies, Nuclear magnetic resonance, Electromagnetic coil, law, Physiology (medical), Electrode, Electric Impedance, Rf ablation |
| الوصف: | This study shows the potential of magnetic resonance electrical impedance tomography (MREIT) as a non-invasive RF ablation monitoring technique.We prepared bovine muscle tissue with a pair of needle electrodes for RF ablation, a temperature sensor, and two pairs of surface electrodes for conductivity image reconstructions. We used the injected current non-linear encoding with multi-echo gradient recalled echo (ICNE-MGRE) pulse sequence in a series of MREIT scans for conductivity imaging. We acquired magnetic flux density data induced by externally injected currents, while suppressing other phase artefacts. We used an 8-channel RF head coil and 8 echoes to improve the signal-to-noise ratio (SNR) in measured magnetic flux density data. Using the measured data, we reconstructed a time series of 180 conductivity images at every 10.24 s during and after RF ablation.Tissue conductivity values in the lesion increased with temperature during RF ablation. After reaching 60 °C, a steep increase in tissue conductivity values occurred with relatively little temperature increase. After RF ablation, tissue conductivity values in the lesion decreased with temperature, but to values different from those before ablation due to permanent structural changes of tissue by RF ablation.We could monitor temperature and also structural changes in tissue during RF ablation by producing spatio-temporal maps of tissue conductivity values using a fast MREIT conductivity imaging method. We expect that the new monitoring method could be used to estimate lesions during RF ablation and improve the efficacy of the treatment. |
| تدمد: | 1464-5157 0265-6736 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cb94a8601aaf25ac7111d8842cb1ffe2 https://doi.org/10.3109/02656736.2014.966337 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....cb94a8601aaf25ac7111d8842cb1ffe2 |
| قاعدة البيانات: | OpenAIRE |
PDF full text from Publisher | تدمد: | 14645157 02656736 |
|---|