Title :
Effects of water-filled bolus on the precision of microwave radiometric measurements of temperatures in biological structures
Author :
Mizushina, S. ; Matsuda, M. ; Matsui, K. ; Hamamura, Y. ; Sugiura, T.
Author_Institution :
Res. Inst. of Electron., Shizuoka Univ., Hamamatsu, Japan
Abstract :
An assessment is made of the degradation that is caused by a water-filled bolus in the precision of tissue temperature measured noninvasively by a five-band microwave radiometry scheme. The precision is expressed in terms of the confidence interval of tissue temperature estimated from a set of five brightness temperatures measured with an experimental instrument operating at center frequencies of 1.2, 1.8, 2.5, 2.9, and 3.6 GHz, with a 0.4-GHz bandwidth. Results show that degradation due to a bolus having a thickness of about 1 cm is small when it is filled with deionized or distilled water. It is concluded that the use of water-filled bolus is permissible for microwave radiometric measurement. This is of a practical importance when the technique is used in combination with electromagnetic heating for hyperthermic treatment of cancer.<>
Keywords :
biomedical measurement; biothermics; radiation therapy; radiometry; temperature measurement; 0.4 GHz; 1.2 to 3.6 GHz; biological structures; brightness temperatures; cancer; electromagnetic heating; hyperthermic treatment; microwave radiometric measurements; temperature measurement; water-filled bolus; Bandwidth; Brightness temperature; Degradation; Electromagnetic heating; Frequency estimation; Frequency measurement; Instruments; Microwave measurements; Microwave radiometry; Temperature measurement;
Conference_Titel :
Microwave Symposium Digest, 1990., IEEE MTT-S International
Conference_Location :
Dallas, TX
DOI :
10.1109/MWSYM.1990.99638
