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Related Concept Videos

Temperature Measurement Sites01:14

Temperature Measurement Sites

4.3K
A thermometer measures body temperature. The common sites for measuring body temperature are the oral cavity, axillary region, temporal artery, and skin surface, such as the forehead, abdomen, and axilla. True core body temperature is assessed in the rectum, tympanic membrane, pulmonary artery, esophagus, and urinary bladder.
Oral: When assessing oral temperature, the thermometer tip should be placed under the tongue in the posterior sublingual pocket. It offers accurate readings and can be...
4.3K
Equipments Used to Measure Body Temperature01:13

Equipments Used to Measure Body Temperature

2.1K
Body temperature can be assessed using various devices and measured in Celsius or Fahrenheit.
Glass-bulb Thermometer:
Glass-bulb thermometers are hollow glass tubes with a bulb tip containing liquid such as ethanol or mercury. Historically, glass bulb mercury thermometers were the standard device to measure body temperature. Today, mercury thermometers are prohibited in many countries due to the hazardous effects of mercury and the risk of exposure if the glass bulb breaks. In general,...
2.1K
Assessing Body Temperature - Rectal01:27

Assessing Body Temperature - Rectal

16.5K
Rectal temperature measurement is considered the most precise method for assessing core body temperature and typically registers higher than oral temperature. For adults, the rectal thermometer should be inserted 1 to 1.5 inches into the rectum to obtain the most accurate reading.
Follow these steps for rectal temperature assessment:
Step 1: Perform hand hygiene and don clean gloves to prevent cross-infection.
Step 2: Position the patient in a side-lying position to better visualize the rectal...
16.5K
Absorption of Radiation01:05

Absorption of Radiation

1.6K
The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:
1.6K
Assessing Body Temperature - Oral01:14

Assessing Body Temperature - Oral

2.1K
Here are the steps to accurately measure oral temperature using an electronic thermometer:
Step 1:
Start by practicing proper hand hygiene to prevent the spread of microorganisms.
Step 2:
Take the thermometer out of the charging unit, switch it on, and wait for the ready sign.
Step 3:
Gently slide the probe cover until a click is heard. This simple action prevents cross-contamination and ensures the correct placement of the probe cover.
Step 4:
Instruct the patient to open their mouth and place...
2.1K

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Related Experiment Video

Updated: May 5, 2026

An Intra-Tissue Radiometry Microprobe for Measuring Radiance In Situ in Living Tissue
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Stable Microwave Radiometry System for Long Term Monitoring of Deep Tissue Temperature.

Paul R Stauffer1, Dario B Rodriques, Sara Salahi

  • 1Radiation Oncology Dept., Duke University, Durham NC USA 27705.

Proceedings of Spie--The International Society for Optical Engineering
|November 19, 2013
PubMed
Summary
This summary is machine-generated.

A new miniature radiometric thermometry system can non-invasively measure deep tissue temperature up to 5cm. This technology accurately tracks temperature changes in organs like the kidney and brain, showing promise for clinical applications.

Keywords:
Radiometrybrown adipose tissue metabolismcore temperature monitoringnon-invasive thermometryvesicoureteral reflux detection

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Area of Science:

  • Biomedical Engineering
  • Medical Physics
  • Thermometry

Background:

  • Non-invasive monitoring of deep tissue temperature is crucial for numerous clinical applications.
  • Existing methods face limitations in accuracy and depth penetration for deep tissue measurements.

Purpose of the Study:

  • To design and evaluate a miniature radiometric thermometry system for non-invasive deep tissue temperature monitoring.
  • To assess the system's performance in measuring volume average temperature of tissue regions up to 5cm deep.

Main Methods:

  • Developed a miniature sensor with an EMI-shielded log spiral microstrip antenna and a high-sensitivity 1.35GHz total power radiometer.
  • Tested the system using simulated and experimental multilayer phantom models representing brown adipose tissue, kidney, and brain.
  • Utilized circulating tissue-mimicking liquids at controlled temperatures to characterize measurement accuracy under varying conditions.

Main Results:

  • The system demonstrated accurate tracking of temperature changes in deep tissue targets, including kidney and brain.
  • Achieved long-term accuracy and stability of ±0.4°C over 4.5 hours.
  • Characterized the sensor's sensitivity and specific absorption rate (SAR) patterns for precise temperature measurement.

Conclusions:

  • The developed non-invasive radiometric thermometry sensor is sensitive enough for clinical applications.
  • Potential uses include detecting vesicoureteral reflux, monitoring brown fat metabolism, and tracking brain core temperature during surgery.