Varian Medical Systems, Inc.

Varian Associates, Inc.

Varian Medical Systems Technologies, Inc.

Raymond Denzil McIntyre

Stanley Mansfield

Marcel R Marc

Steven W Prince

Timothy E Guertin

George A Zdasiuk

Richard Henry Stark

Hassan Mostafavi

Ross Bernald Hannibal

Stanley Woodrow Johnsen

Edward J Seppi

Michelangelo Delfino

Gard Edson Meddaugh

Karl L Brown

Jay D Wood

A radiation system includes a first ring, a radiation source capable of providing radiation suitable for treating a patient, the radiation source secured to the first ring, a second ring located behind the first ring, and an imager secured to the second ring. A radiation system includes a first device having a radiation source capable of generating a radiation beam suitable for treating a patient, and a second device having imaging capability, wherein the first device is oriented at an angle that is less than 180&#xb0; relative to the second device. A radiation system includes a structure having a first opening, a radiation source rotatably coupled to the structure, an imaging device rotatable relative to the structure, and a processor for controlling a rotation of the radiation source and a rotation of the imaging device, wherein the radiation source is rotatable relative to the imaging device.

Medical systems with patient supports

Radiation systems

An x-ray apparatus includes a source configured to generate electrons, a target configured to produce x-rays upon impingement of electrons, and a detector configured to detect electrons penetrating the target or reflected from the incident face of the target, indicative of damage to the target.

Detection of damage to X-ray targets in electron accelerators for radiotherapy

A radiation system includes a radiation source having an accelerator, the radiation source having a magnetic field associated therewith that is resulted from an operation of the accelerator, and a magnetic field source configured to provide a compensating magnetic field to at least partially counteract against the magnetic field that is resulted from the operation of the accelerator. A radiation system includes a radiation device having a radiation source, a patient support, and a protective guard located between the radiation source and the patient support, wherein the protective guard is moveably coupled to the radiation device or the patient support. A radiation system includes a particle generator for generating a particle, an accelerator for accelerating the particle, and a magnetic source for changing a trajectory of the particle, wherein the magnetic source comprises a permanent magnet.

System and methods for treating patients using radiation

An apparatus for use with an accelerator includes a circulator having a first port, a second port, a third port, and a fourth port, wherein the first port is configured to couple to a power generator, and the third port is configured to couple to an accelerator, a first phase shifter coupled to the second port, and a second phase shifter coupled to the fourth port. A method of regulating power to and from an accelerator includes providing power using a power generator, varying a magnitude of the power before the power is delivered to the accelerator, receiving a reflected power from the accelerator, and varying the phase of the reflected power from the accelerator. A method of regulating reflected power from an accelerator includes receiving a reflected power from an accelerator, varying the phase of the reflected power, and varying a magnitude of the reflected power.

Variable radiofrequency power source for an accelerator guide

An apparatus and method for irradiating target objects, especially medical stents for in vivo implantation. A linear accelerator provides a high energy electron beam that impinges upon and is received by an x-ray conversion target. The x-ray conversion target is activated by either a static or dynamically moveable electron beam to generate and emit an x-ray flux so as to efficiently intercept the target object. The x-ray flux is directed to the target object for a desired time period and is of sufficiently high energy to efficiently impart radioactive properties to the target object. Alternatively, the target object is positioned within the path of the x-ray flux or is translated within the path during irradiation. Mechanical transport assemblies such as a carousel, rotational and/or linear translator and/or movement tube system also may be provided.

Method and apparatus for producing radioactive materials for medical treatment using x-rays produced by an electron accelerator

A beam of charged particles is scattered by a thin foil and the flux at two angles .theta..sub.1 and .theta..sub.2, is sampled to yield an exponential function of the respective energy difference, E(.theta..sub.2)-E(.theta..sub.1). For .theta..sub.1 =0.degree., a signal representative of the energy stability of the beam is obtained and compared with a reference to form an error signal for application to the accelerator for stabilizing the beam energy and/or providing an energy interlock.

In-line electron beam energy monitor and control

A system for scanning a beam of charged-particles across a target is described which compensates for energy dispersion in the beam. A time-varying magnet with circular pole pieces is used to sweep the beam left to right. Two wedge-shaped magnet dipoles, one on each side of the center line are used to bend the beam parallel to the center line and compensate for beam energy dispersion.

In-line beam scanning system

In an x-ray treatment machine a charged particle accelerator or cobalt source is provided for producing a field of high energy x-ray radiation for application to a body, for treatment thereof. The radiation machine includes collimators and field shaping structures for shaping the field of x-ray radiation applied to the body. The high energy x-ray radiation intercepted by the field shaping and collimating structures produces high energy secondary electrons by a number of different atomic processes. These energetic secondaries contaminate the shaped radiation field applied to the body being treated. The contaminating high energy electrons, if not eliminated, substantially increase the dosage of radiation delivered to the surface of the body. However, electron deflecting means, such as magnet structures, are provided for interposing in the electron contaminated field of x-ray radiation, so as to provide an electron deflecting flux for deflecting the contaminating electrons and reducing the dose due to these electrons by spreading them out more uniformly over the treated surface. In addition, an electron absorbing screen is interposed in the secondary electron contaminated radiation field for further absorbing the unwanted high energy secondary electrons.

X-ray treatment machine having means for reducing secondary electron

In a high energy X-ray therapy machine, an accelerator accelerates a beam of electrons to energies of several MEV. The electron beam is directed, generally via a beam deflector, onto an X-ray target to produce X-rays for treating a patient. The accelerator and beam deflector are often carried within a rotatable gantry structure, movable for radiating the patient through a series of angular positions or ports. A plurality of ionization chamber radiation detectors are disposed in the radiation field surrounding the beam path of the accelerated electron beam. Ionization current signals are compared from a plurality of the detectors to derive an error signal determinative of a deviation of the beam from an intended beam path. The error signal is utilized to energize beam steering coils for steering the beam along the predetermined beam path. A sample and hold circuit is provided for sampling and holding the error signal to allow interruption of the beam for extended periods of time as may be encountered in the prescribed therapy treatment, while maintaining the proper beam steering conditions.

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Los Altos Hills, CA, United States of America

Raymond Denzil McIntyre