The effects of curved tissue layers on the power deposition patterns of therapeutic ultrasound beams

1994 ◽  
Vol 21 (1) ◽  
pp. 25-34 ◽  
Author(s):  
Xiaobing Fan ◽  
Kullervo Hynynen
Keyword(s):  
Therapeutic Ultrasound ◽  
Power Deposition ◽  
Deposition Patterns

Microwave Induced Temperature Rises in Rabbit Eyes in Cataract Research

1975 ◽  
Vol 97 (1) ◽  
pp. 123-128 ◽  
Author(s):  
A. F. Emery ◽  
P. Kramar ◽  
A. W. Guy ◽  
J. C. Lin
Keyword(s):  
Microwave Power ◽  
Temperature Fields ◽  
Threshold Temperature ◽  
Transient Temperature ◽  
Temperature Level ◽  
Power Deposition ◽  
Deposition Patterns ◽  
Temperature Distributions ◽  
Near Zone ◽  
Good Agreement

Microwave power deposition patterns and temperature distributions were measured for rabbit eyes exposed to localized near zone 2450 MHz radiation and good agreement was obtained between the measured and predicted transient temperature fields. The lenses were biomicroscopically examined to determine the minimum exposure times necessary to produce posterior lens opacity (cataracts) and these times are correlated with the temperature calculations to suggest that a threshold temperature level exists.

scholarly journals Clinical Feasibility of a High-Resolution Thermal Monitoring Sheet for Superficial Hyperthermia in Breast Cancer Patients

Cancers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 3644
Author(s):  
Akke Bakker ◽  
Remko Zweije ◽  
Henny Petra Kok ◽  
Merel Willemijn Kolff ◽  
H. J. G. Desiree van den Bongard ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Heat Transfer ◽  
Temperature Distribution ◽  
High Resolution ◽  
Skin Surface ◽  
Thermal Monitoring ◽  
Power Deposition ◽  
Deposition Patterns ◽  
Surface Temperatures ◽  
Superficial Hyperthermia

Background: Accurate monitoring of skin surface temperatures is necessary to ensure treatment quality during superficial hyperthermia. A high-resolution thermal monitoring sheet (TMS) was developed to monitor the skin surface temperature distribution. The influence of the TMS on applicator performance was investigated, feasibility and ability to reliably monitor the temperature distribution were evaluated in a clinical study. Methods: Phantom experiments were performed to determine the influence of the TMS on power deposition patterns, applicator efficiency, and heat transfer of the water bolus for 434 and 915 MHz applicators. Clinical feasibility was evaluated in 10 women with locoregional recurrent breast cancer. Skin surface temperatures during consecutive treatments were monitored alternatingly with either standard Amsterdam UMC thermometry or TMS. Treatments were compared using (generalized) linear mixed models. Results: The TMS did not significantly affect power deposition patterns and applicator efficiency (1–2%), the reduced heat transfer of the water boluses (51–56%) could be compensated by adjusting the water bolus flow. Skin surface temperatures were monitored reliably, and no alteration of thermal toxicity was observed compared to standard Amsterdam UMC thermometry. Conclusion: Clinical application of the TMS is feasible. Power deposition patterns and applicator efficiency were not affected. Surface temperatures were monitored reliably.

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