Comparative study of 3-D computer models of RF ablation probes

2016 ◽  
Vol 51 (s1) ◽  
pp. S49-S56
Author(s):  
S. Wiak ◽  
A. Firych-Nowacka ◽  
Paolo Di Barba ◽  
Barbara Slusarek
Keyword(s):  
Comparative Study ◽  
Computer Models ◽  
Rf Ablation

scholarly journals Contribution of Direct Heating, Thermal Conduction and Perfusion During Radiofrequency and Microwave Ablation

2007 ◽  
Vol 1 (1) ◽  
pp. 47-52 ◽  
Author(s):  
Wolfgang Schramm ◽  
Deshan Yang ◽  
Bradford J Wood ◽  
Frank Rattay ◽  
Dieter Haemmerich
Keyword(s):  
Thermal Conduction ◽  
Tissue Perfusion ◽  
Computer Models ◽  
Tissue Temperature ◽  
Rf Ablation ◽  
Tissue Properties ◽  
Direct Heating ◽  
Lower Treatment ◽  
Close Proximity ◽  
Calculated Effect

Both radiofrequency (RF) and microwave (MW) ablation devices are clinically used for tumor ablation. Several studies report less dependence on vascular mediated cooling of MW compared to RF ablation. We created computer models of a cooled RF needle electrode, and a dipole MW antenna to determine differences in tissue heat transfer. We created Finite Element computer models of a RF electrode (Cooled needle, 17 gauge), and a MW antenna (Dipole, 13 gauge). We simulated RF ablation for 12 min with power controlled to keep maximum tissue temperature at 100 ºC, and MW ablation for 6 min with 75 W of power applied. For both models we considered change in electric and thermal tissue properties as well as perfusion depending on tissue temperature. We determined tissue temperature profile at the end of the ablation procedure and calculated effect of perfusion on both RF and MW ablation. Maximum tissue temperature was 100 ºC for RF ablation, and 177 ºC for MW ablation. Lesion shape was ellipsoid for RF, and tear-drop shaped for MW ablation. MW ablation is less affected by tissue perfusion mainly due to the shorter ablation time and higher tissue temperature, but not due to MW providing deeper heating than RF. Both MW and RF applicators only produce significant direct heating within mm of the applicator, with most of the ablation zone created by thermal conduction. Both RF and MW applicators only directly heat tissue in close proximity of the applicators. MW ablation allows for higher tissue temperatures than RF since MW propagation is not limited by tissue desiccation and charring. Higher temperatures coupled with lower treatment times result in reduced effects of perfusion on MW ablation.

Author response for "Laminar distribution of cortical projection neurons to the pulvinar: A comparative study in cats and mice"

2020 ◽  
Author(s):  
Bruno Oliveira Ferreira de Souza ◽  
Éve‐Marie Frigon ◽  
Robert Tremblay‐Laliberté ◽  
Christian Casanova ◽  
Denis Boire
Keyword(s):  
Comparative Study ◽  
Author Response ◽  
Projection Neurons ◽  
Cortical Projection ◽  
Laminar Distribution

Structural and functional properties of Escherichia coli-derived nucleoplasmin A comparative study of recombinant and natural proteins

2001 ◽  
Vol 268 (6) ◽  
pp. 1739-1748
Author(s):  
Aitor Hierro ◽  
Jesus M. Arizmendi ◽  
Javier De Las Rivas ◽  
M. Angeles Urbaneja ◽  
Adelina Prado ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Comparative Study ◽  
Functional Properties ◽  
Structural And Functional Properties

Comparative Study of PCR as a Direct Assay and ELISA and AGID as Indirect Assays for the Detection of Bovine Leukaemia Virus

2001 ◽  
Vol 48 (2) ◽  
pp. 97-106 ◽  
Author(s):  
D. Martin ◽  
A. Arjona ◽  
I. Soto ◽  
N. Barquero ◽  
M. Viana ◽  
...  
Keyword(s):  
Comparative Study ◽  
Bovine Leukaemia Virus ◽  
Leukaemia Virus ◽  
Direct Assay
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