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At least 415 records · Page 23Linked to original sources
PubMed1992

Non-invasive thermometry with multi-frequency microwave radiometry.

The present status of the development of a non-invasive thermometer based on microwave radiometry at our laboratory is reported. We have developed a model fitting technique combined with a Monte Carlo technique to retrieve temperature-depth profiles from multi (4-6)-frequency-band microwave radiometric data along with confidence intervals (2-sigma) of tissue temperatures as a function of depth. In order to make the radiometric technique compatible with the heating, brightness temperatures are measured through a 1 cm thick water bolus. Results of phantom experiments are presented to demonstrate the above capabilities of the method. Numerical simulation studies have shown that 2-sigma intervals would be 1.0 K or less over a 0-4 cm range and 1.4 K at 5 cm from the surface with using a six-band, 1-5 GHz radiometer having brightness temperature resolution of 0.03 K (3 s integration time). The six-band instrument is currently being assembled at our laboratory.

Body Temperature↗
PubMed1991

Infrared thermometry of newborn infants.

An infrared thermometer, the FirstTemp, was tested among newborn infants by comparing tympanic membrane temperature measurements in three operating modes, "Cal-tympanic," "Cal-surface," and "Cor-tympanic," with nearly simultaneous tympanic membrane, rectal, and axillary temperature measurements using other standard methods. The FirstTemp underestimated other measurements of body temperature in the "Cal-tympanic" mode and overestimated them in the "Cor-tympanic" mode. In the "Cal-surface" mode, the First-Temp readings were significantly lower than tympanic membrane temperatures measured with a thermistor probe and electronic thermometer (mean difference 0.2 degrees C) but not significantly different from rectal or axillary temperatures. According to these results, the FirstTemp can be used reliably in the "Cal-surface" mode but not in the "Cal-tympanic" or "Cor-tympanic" mode. Its speed and ease of operation offer significant advantages over traditional clinical methods of temperature measurement.

Axilla↗
PubMed1989

[Thermometry as a method of evaluating the status of the peripheral sympathetic nervous system in patients with hemorrhagic fever with nephrotic syndrome].

The inference on irritation of sympathetic nervous system and predominant location of the the process in the thoracic and iliac parts of the sympathetic chain is drawn from investigation of skin temperature at various sites of the body and catecholamines excretion in 30 patients with hemorrhagic fever and renal syndrome. Norepinephrine, excretion enhancement and changes in the picture of skin temperatures were the underlying evidence.

Hemorrhagic Fever with Renal Syndrome↗