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Non-invasive measurement of brain temperature with microwave radiometry: demonstration in a head phantom and clinical case.

Publication ,  Journal Article
Stauffer, PR; Snow, BW; Rodrigues, DB; Salahi, S; Oliveira, TR; Reudink, D; Maccarini, PF
Published in: The neuroradiology journal
February 2014

This study characterizes the sensitivity and accuracy of a non-invasive microwave radiometric thermometer intended for monitoring body core temperature directly in brain to assist rapid recovery from hypothermia such as occurs during surgical procedures. To study this approach, a human head model was constructed with separate brain and scalp regions consisting of tissue equivalent liquids circulating at independent temperatures on either side of intact skull. This test setup provided differential surface/deep tissue temperatures for quantifying sensitivity to change in brain temperature independent of scalp and surrounding environment. A single band radiometer was calibrated and tested in a multilayer model of the human head with differential scalp and brain temperature. Following calibration of a 500MHz bandwidth microwave radiometer in the head model, feasibility of clinical monitoring was assessed in a pediatric patient during a 2-hour surgery. The results of phantom testing showed that calculated radiometric equivalent brain temperature agreed within 0.4°C of measured temperature when the brain phantom was lowered 10°C and returned to original temperature (37°C), while scalp was maintained constant over a 4.6-hour experiment. The intended clinical use of this system was demonstrated by monitoring brain temperature during surgery of a pediatric patient. Over the 2-hour surgery, the radiometrically measured brain temperature tracked within 1-2°C of rectal and nasopharynx temperatures, except during rapid cooldown and heatup periods when brain temperature deviated 2-4°C from slower responding core temperature surrogates. In summary, the radiometer demonstrated long term stability, accuracy and sensitivity sufficient for clinical monitoring of deep brain temperature during surgery.

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Published In

The neuroradiology journal

DOI

EISSN

2385-1996

ISSN

1971-4009

Publication Date

February 2014

Volume

27

Issue

1

Start / End Page

3 / 12

Related Subject Headings

  • Telemetry
  • Radiometry
  • Radiography
  • Phantoms, Imaging
  • Nuclear Medicine & Medical Imaging
  • Models, Anatomic
  • Microwaves
  • Humans
  • Hot Temperature
  • Brain
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Stauffer, P. R., Snow, B. W., Rodrigues, D. B., Salahi, S., Oliveira, T. R., Reudink, D., & Maccarini, P. F. (2014). Non-invasive measurement of brain temperature with microwave radiometry: demonstration in a head phantom and clinical case. The Neuroradiology Journal, 27(1), 3–12. https://doi.org/10.15274/nrj-2014-10001
Stauffer, Paul R., Brent W. Snow, Dario B. Rodrigues, Sara Salahi, Tiago R. Oliveira, Doug Reudink, and Paolo F. Maccarini. “Non-invasive measurement of brain temperature with microwave radiometry: demonstration in a head phantom and clinical case.The Neuroradiology Journal 27, no. 1 (February 2014): 3–12. https://doi.org/10.15274/nrj-2014-10001.
Stauffer PR, Snow BW, Rodrigues DB, Salahi S, Oliveira TR, Reudink D, et al. Non-invasive measurement of brain temperature with microwave radiometry: demonstration in a head phantom and clinical case. The neuroradiology journal. 2014 Feb;27(1):3–12.
Stauffer, Paul R., et al. “Non-invasive measurement of brain temperature with microwave radiometry: demonstration in a head phantom and clinical case.The Neuroradiology Journal, vol. 27, no. 1, Feb. 2014, pp. 3–12. Epmc, doi:10.15274/nrj-2014-10001.
Stauffer PR, Snow BW, Rodrigues DB, Salahi S, Oliveira TR, Reudink D, Maccarini PF. Non-invasive measurement of brain temperature with microwave radiometry: demonstration in a head phantom and clinical case. The neuroradiology journal. 2014 Feb;27(1):3–12.
Journal cover image

Published In

The neuroradiology journal

DOI

EISSN

2385-1996

ISSN

1971-4009

Publication Date

February 2014

Volume

27

Issue

1

Start / End Page

3 / 12

Related Subject Headings

  • Telemetry
  • Radiometry
  • Radiography
  • Phantoms, Imaging
  • Nuclear Medicine & Medical Imaging
  • Models, Anatomic
  • Microwaves
  • Humans
  • Hot Temperature
  • Brain