Levick, A P; Land, D*; Hand, J* (2011) Validation of microwave radiometry for measuring the internal temperature of human tissue. Meas. Sci. Technol., 22 (6). 065801

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Abstract

We have developed a phantom target with a known linear temperature gradient for validating microwave radiometry for measuring the internal temperature profiles within human tissue. The target comprises a volume of phantom tissue material, with dielectric properties similar to human tissue, contained between two copper plates of known temperatures. The antenna of a microwave radiometer is placed in contact with the outer surface of the phantom material. We have measured the sub-surface temperature of the phantom with microwave radiometry in a frequency band of 3.0-3.5 GHz. Our microwave temperature measurements have small random (type A) uncertainties of 0.05 °C and agree reasonably well with values calculated using various models of the antenna-target system. The measurements demonstrate that, for this material at this frequency, microwave radiometry measures sub-surface temperatures at an effective depth of 15 mm. The purpose of this particular target is to simulate the temperature gradient found within the surface layers of a baby's brain during hypothermia neuroprotection therapy, the outer surface of the phantom representing the skin surface and the inner surface the brain core.

Item Type:	Article
Subjects:	Engineering Measurements Engineering Measurements > Thermal
Identification number/DOI:	10.1088/0957-0233/22/6/065801
Last Modified:	02 Feb 2018 13:14
URI:	https://eprintspublications.npl.co.uk/id/eprint/5019