Multi-frequency microwave radiometry has been considered for the measurement of sub-surface temperature distributions of human tissues, envisaged applications being mainly related to the non-invasive temperature monitoring in hyperthermia treatment of cancer. The sensor consists of a broadband microwave receiver, which generates a signal proportional to input radiation power, then a calibration processor averages the receiver output and computes an estimate of the input power in each frequency band. We have developed a new radiometer system of the radiation balance type to counteract the reflectivity errors which may affect the multi-frequency radiometric data to an intolerable amount. In this paper we discuss the reflectivity error of our system on the basis of a model of both incoming radiation and receiver. A formula, which propagates this error to temperature retrieval uncertainty, is also given.

A NEW MULTIFREQUENCY MICROWAVE RADIOMETER FOR MEDICAL OPERATION

TOGNOLATTI, PIERO;
1992

Abstract

Multi-frequency microwave radiometry has been considered for the measurement of sub-surface temperature distributions of human tissues, envisaged applications being mainly related to the non-invasive temperature monitoring in hyperthermia treatment of cancer. The sensor consists of a broadband microwave receiver, which generates a signal proportional to input radiation power, then a calibration processor averages the receiver output and computes an estimate of the input power in each frequency band. We have developed a new radiometer system of the radiation balance type to counteract the reflectivity errors which may affect the multi-frequency radiometric data to an intolerable amount. In this paper we discuss the reflectivity error of our system on the basis of a model of both incoming radiation and receiver. A formula, which propagates this error to temperature retrieval uncertainty, is also given.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11697/11325
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? 1
social impact