التفاصيل البيبلوغرافية
العنوان:
Real-time conductivity imaging of temperature and tissue property changes during radiofrequency ablation: An ex vivo model using weighted frequency difference
المؤلفون:
Tong In Oh , Vincent W. T. Lam , Alistair McEwan , Hyung Joong Kim , Hun Wi , Eung Je Woo
المصدر:
Bioelectromagnetics . 36:277-286
بيانات النشر:
Wiley, 2015.
سنة النشر:
2015
مصطلحات موضوعية:
Materials science , Physiology , Radiofrequency ablation , medicine.medical_treatment , Biophysics , General Medicine , Conductivity , Ablation , law.invention , Nuclear magnetic resonance , Electrical resistivity and conductivity , law , medicine , Radiology, Nuclear Medicine and imaging , sense organs , Radio frequency , Bioelectromagnetics , Electrical impedance tomography , Ablation zone
الوصف:
We demonstrated the feasibility of time difference and weighted frequency difference conductivity imaging for real-time monitoring of temperature distribution and ablation region estimation during radiofrequency (RF) ablation. The electrical conductivity spectrum of biological tissue reflects mobility of ions in intra- and extra-cellular fluids and changes in cellular morphology induced by heating. The time series conductivity spectra were measured in an ex vivo bovine liver by a high-speed electrical impedance tomography (EIT) system. The EIT system was protected by filters to suppress RF energy and allow interleaved real-time imaging. We recorded time and weighted frequency-difference conductivity images and direct temperature variations at the ablation region and control region during 8 min ablation and for the following 66 min of cooling. Conductivity variation in regions of interest was compared with temperature recordings. Contours of conductivity change were visualized and compared to estimate the ablation area. EIT images confirmed increase of conductivity at all frequencies and loss of frequency conductivity change associated with loss of cellular structure. Time difference conductivity images showed changes due to both heating during ablation and heat dissipation following ablation together with tissue property changes. Weighted frequency-difference images presented persistent changes following heating due to the morphological change in the ablation zone. Bioelectromagnetics. 36:277–286, 2015. © 2015 Wiley Periodicals, Inc.
تدمد:
0197-8462
URL الوصول:
https://explore.openaire.eu/search/publication?articleId=doi_________::656d29f682569e6bc9c69e2b0f016f83 https://doi.org/10.1002/bem.21904
حقوق:
CLOSED
رقم الأكسشن:
edsair.doi...........656d29f682569e6bc9c69e2b0f016f83
قاعدة البيانات:
OpenAIRE
