DocumentCode :
1287357
Title :
Air cooling for an interstitial microwave hyperthermia antenna: theory and experiment
Author :
Eppert, Volker ; Trembly, B. Stuart ; Richter, Horst J.
Author_Institution :
Gesamthochschule Kassel-Univ., Germany
Volume :
38
Issue :
5
fYear :
1991
fDate :
5/1/1991 12:00:00 AM
Firstpage :
450
Lastpage :
460
Abstract :
Microwave antennas are inserted through brachytherapy catheters implanted in a tumor to deliver interstitial hyperthermia cancer therapy. Theoretical calculations show that a cooling rate on the order of 0.1 W/cm length of catheter will significantly improve the radial uniformity of the temperature distribution of single antennas or arrays. Experiments and theoretical calculations show that air passing through the annulus between the antenna and the catheter at 10 L/min or less will produce such a cooling rate in a 2.2-mm OD catheter that has both ends accessible. To maintain uniformity of cooling rate along the catheter, it is better to control the cooling rate by preheating the air entering the catheter to 30-40 degrees C than it is to control the flow rate of room-temperature air. Ohmic heating of the antenna feedline does not confound the air cooling action significantly.
Keywords :
biomedical equipment; biothermics; cooling; microwave antennas; radiation therapy; 2.2 mm; 30 to 40 degC; air cooling; air preheating; annulus; antenna feedline; brachytherapy catheters; flow rate; hyperthermia cancer therapy; interstitial microwave hyperthermia; ohmic heating; room-temperature air; temperature distribution radial uniformity; Antenna theory; Brachytherapy; Catheters; Cooling; Electromagnetic heating; Hyperthermia; Microwave antennas; Microwave theory and techniques; Neoplasms; Temperature control; Electric Conductivity; Hyperthermia, Induced; Microwaves; Models, Theoretical; Temperature;
fLanguage :
English
Journal_Title :
Biomedical Engineering, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9294
Type :
jour
DOI :
10.1109/10.81564
Filename :
81564
Link To Document :
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