Microwave frequency modulation of x-ray beam for radio therapy t

Details Microwave frequency modulation of x-ray beam for radio therapy t Microwave frequency modulation of x-ray beam for radio therapy t

1990-04-27

1991-08-27

Westin, Edward P.

X-ray or gamma ray systems or devices

Beam control

600 2, 378 64, 378 65, 378113, 378138, G21K 100, G21K 500, A61N 502

Patent

active

050440063

ABSTRACT:
Radiation of specific material within a subject is accomplished by use of a beam of x-radiation modulated at a microwave frequency. The beam with its modulation is directed at the subject wherein the material interacts with the beam to extract a portion of the radiant energy carried by the beam. In the interaction, an electric field at the modulating frequency appears at the material. By selecting the modulated frequency equal to a resonant interactive microwave frequency of the material, a photon at the microwave frequency is absorbed by the material to alter its physical and chemical properties. By way of example, the material may be an oncogene or virus having a macromolecule and constituting a malignancy within a living subject. Absorption of the modulated radiation selectively destroys the malignancy. The klystron is disposed along the path of an electron beam in an x-ray source for modulating the electron beam and the resulting x-ray beam. An array of x-ray sources and detectors is arranged symmetrically about a site of the subject. Sequential activation of the x-ray sources along with a scanning of the microwave modulating frequency permits measurement of absorption of radiant energy at the various modulation frequencies. This information is used to select the appropriate modulation frequency.

REFERENCES:
patent: 4172979 (1979-10-01), Morrison
patent: 4307726 (1981-12-01), Paulson et al.
patent: 4515165 (1985-05-01), Carroll
patent: 4557272 (1985-12-01), Carr
patent: 4726046 (1988-02-01), Nunan
patent: 4815447 (1989-03-01), Mills
patent: 4815448 (1989-03-01), Mills

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