期刊
IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING
卷 48, 期 2, 页码 261-267出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/10.909647
关键词
ablation; directional; in vivo; myocardium; swine; thermal conductivity; thermal diffusivity
资金
- NHLBI NIH HHS [HL56143] Funding Source: Medline
This paper presents an experimental technique to measure the directional thermal conductivity and thermal diffusivity of materials, A heated thermistor heats the sample and a sensing thermistor placed about 2.5 mm away measures the temperature rise due the heating pulse at the heated thermistor, An empirical relation between the power delivered by the first thermistor and the temperature rise recorded by the sensing thermistor is used to measure the thermal conductivity of the material along the line joining the thermistors. Diffusivity of the material is determined from the delay between the power pulse in the heated thermistor and the temperature pulse at the sensing thermistor. Signal processing was done to eliminate errors in the measurement due to change of base line temperature, Uncertainty of the measurement technique was found to be 5% when tested in media of known thermal properties. The thermal conductivity and thermal diffusivity of swine left ventricle in normal and ablated conditions were measured using this technique. The thermal conductivity of the tissue dropped significantly from 0.61 to 0.50 W . m(-1) . K-1 after ablation while the diffusivity dropped from 2.1 x 10(-7) to 1.7 x 10(-7) m(2) . s(-1).
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