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Related Concept Videos

Temperature Measurement Sites01:14

Temperature Measurement Sites

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...

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Related Experiment Video

Updated: May 17, 2026

Magnetic Resonance-Guided High Intensity Focused Ultrasound Generated Hyperthermia: A Feasible Treatment Method in a Murine Rhabdomyosarcoma Model
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Magnetic Resonance-Guided High Intensity Focused Ultrasound Generated Hyperthermia: A Feasible Treatment Method in a Murine Rhabdomyosarcoma Model

Published on: January 13, 2023

A Magnetic Resonance-Compatible Fiberoptic Temperature Sensor for Measuring Focused Ultrasound-Induced Heating

Sara L Johnson1, Henrik Odéen1, Harry Vine2

  • 1Radiology & Imaging Sciences, University of Utah, Salt Lake City, UT, USA.

Ultrasound in Medicine & Biology
|May 15, 2026
PubMed
Summary

A thin fiberoptic probe accurately measured temperature during magnetic resonance-guided focused ultrasound (MRgFUS) treatments, showing minimal artifacts. This validates its use for calibrating MR thermometry, improving accuracy in focused ultrasound applications.

Keywords:
Fiberoptic temperature probesFocused ultrasoundMR thermometryMRI temperature imagingTemperature measurement validation

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Published on: November 3, 2015

Area of Science:

  • Medical Imaging
  • Biomedical Engineering
  • Acoustics

Background:

  • Accurate temperature monitoring is crucial for magnetic resonance-guided focused ultrasound (MRgFUS) applications.
  • Existing methods for validating MR thermometry can be limited by artifacts, such as viscous heating artifacts (VHAs).

Purpose of the Study:

  • To evaluate a fiberoptic probe for its suitability in validating MR thermometry measurements for MRgFUS.
  • To compare the performance of different fiberoptic probes, including their susceptibility to VHAs.

Main Methods:

  • Three fiberoptic probes with varying coatings and tip diameters were tested in free-field and phantom environments.
  • MRgFUS heating was applied, and temperature measurements from fiberoptic probes were compared with MR thermometry data.
  • Bland-Altman analysis was used to assess agreement between measurement methods.

Main Results:

  • A 0.14 mm diameter glass fiberoptic probe with an ethylene tetrafluoroethylene coating demonstrated negligible VHAs.
  • This probe achieved a root mean squared error of <0.6°C and a limit of agreement of <1.2°C when compared to MR thermometry.
  • In contrast, a 1 mm diameter probe showed significantly larger errors and limits of agreement.

Conclusions:

  • The thin-diameter fiberoptic probe accurately monitored MRgFUS-induced heating without VHAs.
  • This probe facilitates calibration and accuracy studies in active acoustic fields, enhancing MR thermometry sequence calibration.