Invasive microwave array with destructive and coherent phase

Details Invasive microwave array with destructive and coherent phase Invasive microwave array with destructive and coherent phase

1988-02-18

1989-08-29

Jaworski, Francis J.

Surgery

Truss

Pad

128399, 128804, A61N 502

Patent

active

048607525

ABSTRACT:
The hyperthermia treatment apparatus includes an invasive microwave array of applicators with destructive and coherent phase. The desired power phase shift is obtained either by (1) insertion of pre-calibrated phase shift modules or cables, (2) adjustment to the phase of an in-line electronic phase shifter, (3) adjustment of mechanically movable phase shifters such as ferrite or sliding length coaxial line stretchers. A computer provides the proper selection of radiated power for each applicator using a look up table of pre-treatment planning software calculations, and the adjustment of power levels to that determined by the pre-treatment plan. At least one applicator is centrally located with respect to applicators located peripherally. The power and phase shift applied to the central located applicator is computed and applied such as to partially cancel the in phase (coherent) power of the peripheral applicators to substantially reduce the temperature of the centrally located hot spot and provide substantially uniform temperature in the area formed by the applicators using a minimum number of applicators.

REFERENCES:
patent: 4397314 (1983-08-01), Vaguine
patent: 4448198 (1984-05-01), Turner
patent: 4638436 (1987-01-01), Badger et al.
Control of the SAR Pattern Within an Interstitial Microwave Array Through Variation of Antenna Driving Phase, B. Stuart Trembly et al., IEEE Transactions on Microwave Theory and Techniques, vol. MTI-34, #5, 5/86.
Cancer Therapy by Hyperthermia and Radiation, J. P. C. Le Bourgeois et al., Urban & Schwarzenberg, Baltimore-Munich, 1978.

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