A total power radiometer (TPR) and measurement test bed for non-contact biomedical sensing applications

Bonds, Quenton; Weller, Thomas M.; Roeder, B; Herzig, P.

doi:10.1109/wamicon.2009.5207244

Cited by 7 publications

(13 citation statements)

References 3 publications

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“…In [13], the results of a preliminary investigation into using a total power radiometer (TPR) for close-proximity sensing are presented. The TPR antenna is a printed dipole designed to compensate for near-field effects such as antenna-body impedance mismatch, resonance shifts and bandwidth degradation.…”

Section: Close-proximity Radiometrymentioning

confidence: 99%

“…The product of with the physical temperature yields the specimen brightness temperature. As described in [13] the input impedance of the antenna (50 ) is usually well matched to the human body ( ) at radio frequencies. Thus, when the antenna is placed in direct body contact, electromagnetic (EM) waves are coupled through the antenna-body boundary with negligible interference.…”

Section: Stage 3 -Correction At the Air-tui Interfacementioning

confidence: 99%

“…The HCM consists of a solid skin-muscle tissue phantom and liquid blood-fatty tissue phantom. This model provides a more precise representation of the EM characteristics of human tissue than phantoms implemented using simple saline solutions [8], [13]. The first notable distinction is that saline is a liquid and thus cannot accurately represent layered volumes of skin, fat, and muscle.…”

Section: The Human Core Model (Hcm)mentioning

confidence: 99%

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Towards Core Body Temperature Measurement via Close Proximity Radiometric Sensing

et al. 2012

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Presented is a noncontact model and radiometric sensor developed to facilitate core body temperature extraction. The system has been designed as a close-proximity sensor to detect thermal emissions radiated from deep inside the human body. The radiometer uses a cavity-backed slot antenna (CBSA) designed to account for performance degradation which occurs in the near field of the human body. Tissue-simulating materials with electrical properties similar to the human body have been identified, and layered configurations of these phantoms are used to mimic the electromagnetic characteristics of a human stomach volume: hence, defines the core model. Positioned approximately 7 mm from the core model, the sensor tracks the change in brightness temperature as the subsurface physical temperature is varied. A mathematical noncontact model (NCM) is subsequently used to correlate the observed brightness temperature to the subsurface temperature, accounting for artifacts induced by the sensor's remote positioning from the specimen. The accuracy of the NCM is validated through an analysis of the measurement data extracted from the test bed before and after applying the model. The results illustrate that the measurement is highly sensitive to the antenna impedance match and atmospheric temperature. The measurement is less sensitive to the physical temperature of the instrument and emissivity of the specimen. The results of this study demonstrate that radiometric sensors are capable of close proximity, subsurface extraction of biological data given that certain parameters are closely monitored. Index Terms-Closeproximity health monitoring, near-field biomedical sensing, noncontact biomedical sensing, noninvasive biomedical monitoring. 1530-437X/$26.00 John Gerig, photograph and biography not available at the time of publication. Thomas M. Weller (S'92-M'95-SM'98) received the B.S., M.S., and Ph.D. degrees in electrical engineering in 1988, 1991, and 1995, respectively, from the University of Michigan, Ann Arbor.

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Section: Close-proximity Radiometrymentioning

confidence: 99%

Section: Stage 3 -Correction At the Air-tui Interfacementioning

confidence: 99%

Section: The Human Core Model (Hcm)mentioning

confidence: 99%

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Towards Core Body Temperature Measurement via Close Proximity Radiometric Sensing

et al. 2012

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“…As shown in Fig. 1, these effects degrade antenna characteristics causing input impedance variations, resonance shifts, and bandwidth degradation, resulting in significant signal loss [2]. …”

Section: A Antenna-body Effectsmentioning

confidence: 99%

“…Near field antenna effects: Resonance shifts (±50 MHz) and bandwidth degradation (±100 MHz) as a function of antenna offset distance[2].…”

mentioning

confidence: 99%

A tunable Cavity Backed Slot Antenna (CBSA) for close proximity biomedical sensing applications

Bonds

Weller

Roeder³

et al. 2009

2009 IEEE International Conference on Microwaves, Communications, Antennas and Electronics Systems

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Presented is a Cavity Backed Slot Antenna (CBSA) designed for integration into a biomedical radiometric sensor. The sensor is intended for close proximity health monitoring applications. An internal probe feed adds a novel approach to biomedical antenna design by isolating antenna feed currents from the body and providing frequency tuning of ~50MHz/mm as a function of probe length. Measurements and simulations performed with the CBSA in close proximity to a skin tissue phantom confirm that the antenna is a good candidate for the intended applications.

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Monostatic radiometry system for temperature measurement during RF hyperthermia treatment

Byambaakhuu

Nyamsuren

Park

et al. 2017

Microw. Opt. Technol. Lett.

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In this article, we propose a monostatic radiometry system for measuring the internal temperature of human tissue, while simultaneously performing radio frequency (RF) hyperthermia treatment. To demonstrate the adequacy of the proposed scheme, we present the results of experiments conducted on pork samples, which have a biological structure and electrical characteristics that are quite similar to those of the human body. We propose to use S‐band total power radiometry. The radiometry frequency was set at 3.85 GHz, with an operating bandwidth of 220 MHz, system gain of 66.95 dB, total system noise figure of 1.75 dB, and a sensitivity of 0.27 K. In order to prevent damage to the radiometry system, an RF switch and a low‐pass filter were added at the front‐end of the monostatic radiometry system to obtain sufficient isolation from the heating system. Using the skin, fat, and muscle tissue models, we performed both experiments and numerical simulations for a biological tissue model using a single dual‐band rectangular waveguide antenna operated at 5.725 GHz for microwave heating. In addition, we tested the proposed monostatic radiometry system in real‐time using pork samples, with an experimental setup capable of simultaneous microwave heating and radiometric temperature measurement. The system performance was verified by comparing the experimental radiometric results with the actual measured temperatures and simulation results.

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A total power radiometer (TPR) and measurement test bed for non-contact biomedical sensing applications

Cited by 7 publications

References 3 publications

Towards Core Body Temperature Measurement via Close Proximity Radiometric Sensing

Towards Core Body Temperature Measurement via Close Proximity Radiometric Sensing

A tunable Cavity Backed Slot Antenna (CBSA) for close proximity biomedical sensing applications

Monostatic radiometry system for temperature measurement during RF hyperthermia treatment

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