The following table or figure may be downloaded to PowerPoint for personal use in teaching and presentations. This feature is available to all subscribers to the journal.
You MUST read and follow the guidelines at Request to Reproduce AJR Content if you are distributing or using AJR content beyond academic use (limited distribution, non-revenue producing, or educational purposes).
(Downloading may take up to 30 seconds.
If the slide opens in your browser, select File -> Save As to save it.)
Click on image to view larger version.
Fig. 1B —On graphs of effects of hyperbarism on radiofrequency thermal
ablation procedures performed on explanted bovine liver specimens at power
setting of 20 W, raw curves depict single point measured. Graphs show results
of procedures performed at five different pressures (n = 7). Within
pressure and temperature ranges used, enthalpy of vaporization and thermal and
electrical conductivity of tissue fluids are not expected to undergo
variations capable of influencing framework being established
[22]. Graph shows effects of
test pressures on boiling points of distilled water (
)
[22] and liver tissue fluid
(
). Tissue–fluid boiling point is reflected in graph by maximum
tissue temperatures recorded by thermocouple just before impedance-related
interruption of radiofrequency energy delivery. Small differences between
boiling points of water and of tissue fluids are due to presence of salts and
other biologic elements in tissue fluids and to temperature gradient between
tissue and electrode tip that houses thermocouple. Agreement between
experimental data and ideal water boiling points underlines importance of
tissue water content on radiofrequency thermal ablation outcome. Same results
were observed at power settings of 30, 40, and 50 W. SE = standard error
