Ultrasound hyperthermia applicator with variable coherence by mu

Details Ultrasound hyperthermia applicator with variable coherence by mu Ultrasound hyperthermia applicator with variable coherence by mu

1982-09-15

1986-11-18

Cohen, Lee S.

Surgery

Truss

Pad

128 24A, 367138, A61F 700

Patent

active

046229728

ABSTRACT:
An ultrasound hyperthermia applicator comprises a plurality of transducers which can be operated in different grouping modes so that the applicator is effectively provided with a variable number of elements having variable effective diameters transmitting coherent beams. The individually coherent beams from these elements are individually focused for incoherent superposition in the target volume according to a spiral or multi-spiral focusing scheme. Such an applicator is capable of uniformly heating without scanning a limited part of human body with volume greater than the inherent focal size of the individual transmitter element.

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Marmor et al, "Treating Spontaneous Tumors . . . ", Int. J. Rad. Onc. Biol. Phys., vol. 4, pp. 967-973, 1978.
Rivin et al, "Ultrasonic Hyperthermia System . . . ", Med. Inst., vol. 14, No. 6, pp. 325-328, Nov., Dec. 1980.
Lele, "Induction of Deep, Local Hyperthermia . . . ", Radiat. Environ. Biophys., 17, 205-217, 1980.
Lele, "An Annular Focus Ultrasonic Lens . . . ", Ultrasound Med. & Biol., 7, 191-193, 1981.
Beard et al, "An Annular Focus Ultrasonic Lens . . . ", Ultrasound in Med. & Biol., vol. 8, No. 2, pp. 177-184, 1982.

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