A new RF radiometer for absolute noninvasive temperature sensing in biomedical applications

Abd El Monem M. El-Sharkawy, Paul P. Sotiriadis, Paul A. Bottomley, Ergin Atalar

Research output: Contribution to journalConference articlepeer-review

Abstract

Temperature sensing using microwave radiometry has proven value for non-invasively measuring the absolute temperature of tissues inside the human body. However, current clinical radiometers operate in GHz or infrared frequency ranges; this limits their depth of penetration since the human body is not "transparent" at these frequencies. To address this problem, we have designed and built an advanced, near-field radiometer operating at VHF frequencies (64MHz) with a -100 KHz bandwidth. In the core of the radiometer lie an embedded impedance analyzer and an automatic antenna matching network; they compensate in-real time for any load variation that may occur due to near-field antenna coupling and movements of the human body. The radiometer has performed accurate temperature measurements to within ±0.1°C, over a tested physiological range of 28-40°C in saline phantoms whose electric properties match those of human tissue. The current method has the potential of being integrated on Magnetic Resonance Imaging (MRI) modalities.

Original languageEnglish (US)
Article number4252638
Pages (from-to)329-332
Number of pages4
JournalProceedings - IEEE International Symposium on Circuits and Systems
DOIs
StatePublished - 2007
Event2007 IEEE International Symposium on Circuits and Systems, ISCAS 2007 - New Orleans, LA, United States
Duration: May 27 2007May 30 2007

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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