Charged particle cancer therapy beam path control method and apparatus

• US 8,957,396 B2
• Filed: 05/21/2009
• Issued: 02/17/2015
• Est. Priority Date: 05/22/2008
• Status: Expired due to Fees

• Current Assignee: Vladimir Yegorovich Balakin
• Original Assignee: Vladimir Yegorovich Balakin
• Inventors: Balakin, Vladimir Yegorovich
• Primary Examiner(s): SMYTH, ANDREW P
• Application Number:
  US12/994,132
• Publication Number:
  US 20110182410A1
• Time in Patent Office: 2,098 Days
• Field of Search: None
• US Class Current: 250/492.3
• CPC Class Codes: A61N 2005/1087 Ions; Protons
• CPC Class Codes: G21K 1/087 by electrical means
• CPC Class Codes: G21K 1/093 by magnetic means
• CPC Class Codes: G21K 1/14 using charge exchange devices, e.g. for neutralising or changing the sign of the electrical charges of beams producing or accelerating neutral particle beams H05H3/00
• CPC Class Codes: H05H 13/04 Synchrotrons
• CPC Class Codes: H05H 7/04 Magnet systems , e.g. undulators, wigglers free-electron laser H01S3/0903; Energisation thereof
• CPC Class Codes: H05H 7/08 Arrangements for injecting particles into orbits
• CPC Class Codes: H05H 7/10 Arrangements for ejecting particles from orbits

Abstract

The invention comprises a charged particle beam path coupling an injector, synchrotron accelerator, beam transport system, targeting system, and/or patient interface method and apparatus. Preferably, the injector comprises: a negative ion beam source, a two phase ion source vacuum system, an ion beam focusing lens, and/or a tandem accelerator. Preferably, the synchrotron comprises turning magnets, edge focusing magnets, magnetic field concentration magnets, winding and correction coils, flat magnetic field incident surfaces, and/or extraction elements. Preferably, the synchrotron, beam transport system, targeting system, and patient interface combine to allow multi-axis/multi-field irradiation, where multi-axis control comprises control of horizontal and vertical beam position, beam energy, and/or beam intensity and multi-field control comprises control of patient rotation and distribution of delivered energy in and about the tumor in a time controlled, targeted, accurate, precise, dosage controlled, and/or efficient manner.

Claims

1. A method for radiation therapy of a tumor of a patient with charged particles from a charged particle cancer therapy system, comprising sequential steps of:

generating hydrogen anions in an injector;

converting the hydrogen anions into protons using an injection foil;

injecting the protons into a synchrotron;

accelerated the protons in said synchrotron yielding accelerated charged particles;

inducing oscillation of the acceleration charged particles yielding oscillating charged particles;

extracting the oscillating charged particles from said synchrotron using an extraction foil yielding reduced energy charged particles; and

transporting the reduced energy charged particles to the tumor, wherein a charged particle beam path initiates in said injector, wherein said charged particle beam path circumferentially surrounds the protons in said synchrotron,

wherein said charged particles beam path circumferentially surrounds at least a portion of all of;

(1) the hydrogen anions;

(2) the accelerated charged particles;

(3) the oscillating charged particles; and

(4) the reduced energy charged particles, and

wherein the reduced energy charged particles traverse a reduced energy path inside of a mean radius of curvature path of the accelerated charged particles, said reduced energy path passing through an angle of at least ninety degrees circumferentially about a center of said synchrotron.

2. The method of claim 1, further comprising the step of:

passing the charged particles through an input foil in said injector;

maintaining a first vacuum in said charged particle beam path on a first side of said injection foil; and

maintaining a second vacuum within said charged particle beam path on a second side of said input foil, wherein a first pressure of said first vacuum does not equal a second pressure of said second vacuum.

3. The method of claim 1, further comprising the steps of:

producing negative ions in a negative ion beam with a negative ion source in said injector;

focusing the negative ions using first electric field lines in an ion beam focusing lens; and

converting the negative ions into the charged particles with a converting foil.

4. The method of claim 1, further comprising the steps of:

generating an ion beam in an ion beam generation source of said injector;

creating a magnetic field barrier between a high temperature plasma zone within said ion beam generation source and a low temperature plasma region using a magnetic material centrally positioned within said ion beam generation source, wherein said charged particle beam path initiates with negative ions formed in said low temperature plasma region; and

extracting the negative ions from said low temperature plasma region forming a negative ion beam comprising the hydrogen anions,

wherein said charged particle beam path circumferentially surrounds said negative ion beam.