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dc.contributor.authorEl-Sharkawy, A.-M. M.en_US
dc.contributor.authorSotiriadis, P. P.en_US
dc.contributor.authorBottomley, P. A.en_US
dc.contributor.authorAtalar, Erginen_US
dc.date.accessioned2016-02-08T10:17:23Z
dc.date.available2016-02-08T10:17:23Z
dc.date.issued2006en_US
dc.identifier.issn1549-8328
dc.identifier.urihttp://hdl.handle.net/11693/23677
dc.description.abstractTemperature detection using microwave radiometry has proven value for noninvasively measuring the absolute temperature of tissues inside the body. However, current clinical radiometers operate in the gigahertz range, which limits their depth of penetration. We have designed and built a noninvasive radiometer which operates at radio frequencies (64 MHz) with ∼100-kHz bandwidth, using an external RF loop coil as a thermal detector. The core of the radiometer is an accurate impedance measurement and automatic matching circuit of 0.05 Ω accuracy to compensate for any load variations. The radiometer permits temperature measurements with accuracy of ±0.1°K, over a tested physiological range of 28°C-40 °C in saline phantoms whose electric properties match those of tissue. Because 1.5 T magnetic resonance imaging (MRI) scanners also operate at 64 MHz, we demonstrate the feasibility of integrating our radiometer with an MRI scanner to monitor RF power deposition and temperature dosimetry, obtaining coarse, spatially resolved, absolute thermal maps in the physiological range. We conclude that RF radiometry offers promise as a direct, noninvasive method of monitoring tissue heating during MRI studies and thereby providing an independent means of verifying patient-safe operation. Other potential applications include titration of hyper- and hypo-therapies.en_US
dc.language.isoEnglishen_US
dc.source.titleIEEE Transactions on Circuits and Systems. Part 1: Regular Papersen_US
dc.relation.isversionofhttp://doi.org/10.1109/TCSI.2006.884423en_US
dc.subjectAutomatic matching and tuningen_US
dc.subjectMagnetic resonance imaging (MRI)en_US
dc.subjectMicrowave radiometryen_US
dc.subjectTemperature measurementen_US
dc.subjectThermographyen_US
dc.titleAbsolute temperature monitoring using RF radiometry in the MRI scanneren_US
dc.typeArticleen_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.citation.spage2396en_US
dc.citation.epage2404en_US
dc.citation.volumeNumber53en_US
dc.citation.issueNumber11en_US
dc.identifier.doi10.1109/TCSI.2006.884423en_US
dc.publisherInstitute of Electrical and Electronics Engineersen_US
dc.contributor.bilkentauthorAtalar, Ergin
dc.identifier.eissn1558-0806


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