TY - GEN
T1 - RF radiometery sensor sensitivity and detection profile
AU - El-Sharkawy, Abd El Monem M.
AU - Sotiriadis, Paul P.
AU - Bottomley, Paul A.
AU - Atalar, Ergin
PY - 2007/1/1
Y1 - 2007/1/1
N2 - 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 previously designed and built an advanced, near-field radiometer operating at VHF frequencies (64MHz) with a ∼100 KHz bandwidth. 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. In this work we analyze radiofrequency (RF) coil designs suitable for RF Radiometry. We investigate the coil profile sensitivity to look where temperature information is coming from and the depth of penetration associated with the receiver used. We also look into the virtues of using multi-turn coils versus single loop coils. We conclude that by using multi-turn coils the received noise signal is more sensitive to sample noise and temperature can be estimated more accurately especially with the use of smaller receivers.
AB - 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 previously designed and built an advanced, near-field radiometer operating at VHF frequencies (64MHz) with a ∼100 KHz bandwidth. 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. In this work we analyze radiofrequency (RF) coil designs suitable for RF Radiometry. We investigate the coil profile sensitivity to look where temperature information is coming from and the depth of penetration associated with the receiver used. We also look into the virtues of using multi-turn coils versus single loop coils. We conclude that by using multi-turn coils the received noise signal is more sensitive to sample noise and temperature can be estimated more accurately especially with the use of smaller receivers.
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U2 - 10.1109/LSSA.2007.4400913
DO - 10.1109/LSSA.2007.4400913
M3 - Conference contribution
AN - SCOPUS:50849103935
SN - 9781424418138
T3 - 2007 IEEE/NIH Life Science Systems and Applications Workshop, LISA
SP - 176
EP - 179
BT - 2007 IEEE/NIH Life Science Systems and Applications Workshop, LISA
PB - IEEE Computer Society
T2 - 2007 IEEE/NIH Life Science Systems and Applications Workshop, LISA
Y2 - 8 November 2007 through 9 November 2007
ER -