Scanning irradiation device of charged particle beam

• US 8,222,613 B2
• Filed: 10/06/2009
• Issued: 07/17/2012
• Est. Priority Date: 10/15/2008
• Status: Active Grant

• Current Assignee: Shizuoka Prefecture Business Development Office, Division of Commerce and Industry, Department of Industry
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Tajiri, Shinya, Yamamoto, Yuichi, Pu, Yuehu, Yamashita, Haruo
• Primary Examiner(s): Berman, Jack
• Assistant Examiner(s): SAHU, MEENAKSHI S
• Application Number:
  US12/574,136
• Publication Number:
  US 20100090123A1
• Time in Patent Office: 1,015 Days
• Field of Search: 250/398, 250/495.1, 250/396.ML, 250/493.1, 250/492.1
• US Class Current: 250/398
• CPC Class Codes: A61N 2005/1087 Ions; Protons
• CPC Class Codes: A61N 5/1042 with spatial modulation of the radiation beam within the treatment head
• CPC Class Codes: A61N 5/1043 Scanning the radiation beam, e.g. spot scanning or raster scanning
• CPC Class Codes: A61N 5/1078 Fixed beam systems
• CPC Class Codes: A61N 5/1084 for delivering multiple intersecting beams at the same time, e.g. gamma knives
• CPC Class Codes: G21K 1/093 by magnetic means
• CPC Class Codes: G21K 5/00 Irradiation devices discharge tubes for irradiating H01J37/00

Abstract

An inexpensive scanning irradiation device of a particle beam is obtained without using a rotating gantry. A first scanning electromagnet and a second scanning electromagnet, whose deflection surfaces of the particle beam are the same, and which bend the particle beam having an incident beam axis angle of approximately 45 degrees relative to a horizontal direction in reverse directions to each other; an electromagnet rotation driving mechanism which integrates the first and the second scanning electromagnets and rotates these scanning electromagnets around the incident beam axis; and a treatment bed are provided. The particle beam deflected by the first and the second scanning electromagnets can be obtained at a range of −45 degrees to +45 degrees in deflection angle from an incident beam axis direction.

Claims

1. A scanning irradiation device of a charged particle beam, comprising:

a first scanning electromagnet and a second scanning electromagnet located at the lower stream of the first scanning electromagnet, whose deflection surfaces of a charged particle beam are the same, and whose excitations are controlled so as to bend, in reverse directions of each other, the charged particle beam having an incident beam axis angle of approximately 45 degrees relative to a horizontal direction;

an electromagnet rotation driving mechanism which integrates the first and the second scanning electromagnets and rotates these scanning electromagnets around the incident beam axis;

a scanning irradiation control device which performs control of the excitations of the first and the second scanning electromagnets and performs control of the rotation of the electromagnet rotation driving mechanism; and

a treatment bed which is moved to the lower stream of the second scanning electromagnet and is installed so that a body axis direction of a patient is in a direction orthogonal to a flat surface, the surface being in a direction perpendicular to a floor and including the incident beam axis,

the first and the second scanning electromagnets are configured such that a maximum deflection angle of the second scanning electromagnet is larger than a maximum deflection angle of the first scanning electromagnet, and the charged particle beam deflected by the first and the second scanning electromagnets can be obtained at a range of −

45 degrees to +45 degrees in deflection angle from the incident beam axis direction.

2. The scanning irradiation device of the charged particle beam according to claim 1, wherein the treatment bed can be rotated at a range of −

15 degrees to +15 degrees around an axis orthogonal to the flat surface, the surface being in the direction perpendicular to the floor and including the incident beam axis, and the first and the second scanning electromagnets are configured so that the charged particle beam deflected by the first and the second scanning electromagnets can be obtained at a range of −

30 degrees to +30 degrees in deflection angle from the incident beam axis direction.

3. The scanning irradiation device of the charged particle beam according to claim 1, wherein the scanning electromagnets are each composed of a fixed yoke frame having a rectangle shape and a pair of poles wound by coils which are arranged inside the fixed yoke frame and slid in the fixed yoke frame, the pair of poles being slid in the fixed yoke frame in response to the deflection angle of the charged particle beam.

4. A scanning irradiation device of a charged particle beam, comprising:

a first scanning electromagnet and a second scanning electromagnet located at the lower stream of the first scanning electromagnet, whose deflection surfaces of a charged particle beam are the same, and whose excitations are controlled so as to bend, in reverse directions of each other, the charged particle beam having a first incident beam axis angle of approximately 22.5 degrees relative to a horizontal direction;

a first electromagnet rotation driving mechanism which integrates the first and the second scanning electromagnets and rotates these scanning electromagnets around the first incident beam axis;

a third scanning electromagnet and a fourth scanning electromagnet located at the lower stream of the third scanning electromagnet, whose deflection surfaces of a charged particle beam are the same, and whose excitations are controlled so as to bend, in reverse directions to each other within a flat surface, the charged particle beam having a second incident beam axis angle of approximately 112.5 degrees relative to the horizontal direction, the surface being in a direction perpendicular to a floor and including the second incident beam axis;

a second electromagnet rotation driving mechanism which integrates the third and the fourth scanning electromagnets and rotates these scanning electromagnets around the second incident beam axis;

a scanning irradiation control device which performs control of the excitations of the first, the second, the third, and the fourth scanning electromagnets, and performs control of the rotations of the first and the second electromagnet rotation driving mechanisms; and

a treatment bed which is moved to the lower stream of the second and the fourth scanning electromagnets and is installed so that a body axis direction of a patient is in a direction orthogonal to a flat surface, the surface being in a direction perpendicular to the floor and including the incident beam axis, wherein

the first and the second scanning electromagnets are configured so that a maximum deflection angle of the second scanning electromagnet is larger than a maximum deflection angle of the first scanning electromagnet, and the charged particle beam deflected by the first and the second scanning electromagnets can be obtained at a range of −

22.5 degrees to +22.5 degrees in deflection angle from the first incident beam axis direction, and

the third and the fourth scanning electromagnets are configured so that a maximum deflection angle of the fourth scanning electromagnet is larger than a maximum deflection angle of the third scanning electromagnet, and the charged particle beam deflected by the third and the fourth scanning electromagnets can be obtained at a range of −

22.5 degrees to +22.5 degrees in deflection angle from the second incident beam axis direction.

5. The scanning irradiation device of the charged particle beam according to claim 4, wherein the treatment bed can be rotated at a range of −

15 degrees to +15 degrees around axes orthogonal to the flat surfaces, the surfaces being in the direction perpendicular to the floor and including the incident beam axes, the first and the second scanning electromagnets are configured so that the charged particle beam deflected by the first and the second scanning electromagnets can be obtained at a range of −

15 degrees to +15 degrees in deflection angle from the first incident beam axis direction, and the third and the fourth scanning electromagnets are configured so that the charged particle beam deflected by the third and the fourth scanning electromagnets can be obtained at a range of −

15 degrees to +15 degrees in deflection angle from the second incident beam axis direction.

6. The scanning irradiation device of the charged particle beam according to claim 4, wherein the scanning electromagnets are each composed of a fixed yoke frame having a rectangle shape and a pair of poles wound by coils which are arranged inside the fixed yoke frame and slid in the fixed yoke frame, the pair of poles being slid in the fixed yoke frame in response to the deflection angle of the charged particle beam.

7. A scanning irradiation device of a charged particle beam, comprising:

a first scanning electromagnet and a second scanning electromagnet located at the lower stream of the first scanning electromagnet, whose deflection surfaces of a charged particle beam are the same, and whose excitations are controlled so as to bend, in reverse directions of each other, the charged particle beam having an incident beam axis angle of approximately 90 degrees relative to a horizontal direction;

an electromagnet rotation driving mechanism which integrates the first and the second scanning electromagnets and rotates these scanning electromagnets around the incident beam axis;

a scanning irradiation control device which performs control of the excitations of the first and the second scanning electromagnets and performs control of the rotation of the electromagnet rotation driving mechanism; and

a sitting position treatment bed which is arranged in a direction perpendicular to a floor at the lower stream of the second scanning electromagnet, and in which a backrest can be inclined back and forth at a range of −

45 degrees to +45 degrees, wherein

the first and the second scanning electromagnets are configured so that a maximum deflection angle of the second scanning electromagnet is larger than a maximum deflection angle of the first scanning electromagnet, and the charged particle beam deflected by the first and the second scanning electromagnets can be obtained at a range of −

45 degrees to +45 degrees in deflection angle from the incident beam axis direction.

8. The scanning irradiation device of the charged particle beam according to claim 7, wherein the scanning electromagnets are each composed of a fixed yoke frame having a rectangle shape and a pair of poles wound by coils which are arranged inside the fixed yoke frame and slid in the fixed yoke frame, the pair of poles being slid in the fixed yoke frame in response to the deflection angle of the charged particle beam.

9. A scanning irradiation device of a charged particle beam, comprising:

a first scanning electromagnet and a second scanning electromagnet located at the lower stream of the first scanning electromagnet, whose deflection surfaces of a charged particle beam are the same, and whose excitations are controlled so as to bend, in reverse directions to each other, the charged particle beam having an incident beam axis angle of approximately 0 degrees relative to a horizontal direction;

an electromagnet rotation driving mechanism which integrates the first and the second scanning electromagnets and rotates these scanning electromagnets around the incident beam axis;

a scanning irradiation control device which performs control of the excitations of the first and the second scanning electromagnets and performs control of the rotation of the electromagnet rotation driving mechanism; and

a sitting position treatment bed which is faced to the charged particle beam and arranged in a direction perpendicular to a floor at the lower stream of the second scanning electromagnet, and in which a backrest can be inclined back and forth at a range of −

45 degrees to +45 degrees, wherein

the first and the second scanning electromagnets are configured so that a maximum deflection angle of the second scanning electromagnet is larger than a maximum deflection angle of the first scanning electromagnet, and the charged particle beam deflected by the first and the second scanning electromagnets can be obtained at a range of −

45 degrees to +45 degrees in deflection angle from the incident beam axis direction.

10. The scanning irradiation device of the charged particle beam according to claim 9, wherein the scanning electromagnets are each composed of a fixed yoke frame having a rectangle shape and a pair of poles wound by coils which are arranged inside the fixed yoke frame and slid in the fixed yoke frame, the pair of poles being slid in the fixed yoke frame in response to the deflection angle of the charged particle beam.

11. A scanning irradiation device of a charged particle beam, comprising:

a first scanning electromagnet and a second scanning electromagnet located at the lower stream of the first scanning electromagnet, whose deflection surfaces of a charged particle beam are the same, and whose excitations are controlled so as to bend, in reverse directions to each other, the charged particle beam having an incident beam axis angle of approximately 90 degrees relative to a horizontal direction;

a scanning irradiation control device which performs control of the excitations of the first and the second scanning electromagnets; and

a sitting position treatment bed which is arranged in a direction perpendicular to a floor at the lower stream of the second scanning electromagnet, and in which a backrest can be inclined back and forth at a range of −

45 degrees to +45 degrees and can be rotated at a range of −

90 degrees to +90 degrees around a rotation axis in the direction perpendicular to the floor, wherein

the first and the second scanning electromagnets are configured so that a maximum deflection angle of the second scanning electromagnet is larger than a maximum deflection angle of the first scanning electromagnet, and the charged particle beam deflected by the first and the second scanning electromagnets can be obtained at a range of −

45 degrees to +45 degrees in deflection angle from the incident beam axis direction.

12. The scanning irradiation device of the charged particle beam according to claim 11, wherein the scanning electromagnets are each composed of a fixed yoke frame having a rectangle shape and a pair of poles wound by coils which are arranged inside the fixed yoke frame and slid in the fixed yoke frame, the pair of poles being slid in the fixed yoke frame in response to the deflection angle of the charged particle beam.