Device And Method For Positioning A Target Volume In A Radiation Therapy Apparatus

• US 20110137159A1
• Filed: 12/06/2010
• Published: 06/09/2011
• Est. Priority Date: 12/12/2005
• Status: Active Grant

• Current Assignee: Ion Beam Applications s.a.
• Original Assignee: Ion Beam Applications s.a.
• Inventors: Labarbe, Rudi, Jongen, Yves
• Granted Patent: US 8,351,573 B2
• Time in Patent Office: Days
• US Class Current: 600/427
• CPC Class Codes: A61B 6/0421 with immobilising means
• CPC Class Codes: A61N 2005/1087 Ions; Protons
• CPC Class Codes: A61N 5/1049 for verifying the position of the patient with respect to the radiation beam
• CPC Class Codes: A61N 5/1065 Beam adjustment
• CPC Class Codes: A61N 5/1069 Target adjustment, e.g. moving the patient support

Abstract

A device is provided for positioning a target volume, such as a phantom or a patient, in a radiation therapy apparatus. The apparatus directs a radiation beam towards the target. The apparatus can include a target support whereon the target is immobilized, a two dimensional radiation detector fixed with fixations means in a known geometric relationship to the target support, the radiation detector being capable of detecting the position of intersection of the radiation beam with the detector, and correcting means for correcting the relative position of the beam and the target support, based on the detected intersection position.

Claims

1-13. -13. (canceled)

14. A radiation therapy apparatus configured to align a radiation beam with a target receiving therapy, the radiation therapy apparatus comprising:

a target support configured to immobilize the target;

a fixation device connected to the target support;

a radiation detector connected to the fixation device, the radiation detector configured to detect an intersection position of the radiation beam with the radiation detector; and

a correcting device configured to correct a relative position of the radiation beam and the target support, based on the detected intersection position of the radiation detector.

15. The apparatus of claim 14 wherein the radiation detector has a longitudinal axis and the fixation device holds the longitudinal axis of radiation detector parallel to the target support.

16. A radiation therapy apparatus configured to align a radiation beam with a target receiving therapy, the radiation therapy apparatus comprising:

a target support configured to immobilize the target;

a fixation device connected to the target support;

a radiation detector connected to the fixation device, the radiation detector having a planar detection surface which is configured to detect an intersection position of the radiation beam along X, Y axes of the planar detection surface of the radiation detector; and

a correcting device configured to correct a relative position of the radiation beam and the target support, based on the detected intersection position on the X, Y axes of the planar detection surface of the radiation detector.

17. The apparatus of claim 16 wherein the planar surface of the radiation detector has a longitudinal axis and the fixation device holds the longitudinal axis of radiation detector parallel to the target support.

18. The apparatus of claim 17 wherein the fixation device is configured to hold the planar detection surface perpendicular to the radiation beam.

19. A radiation therapy apparatus configured to align a radiation beam with a target receiving therapy, the radiation therapy apparatus comprising:

a target support configured to immobilize the target;

a radiation detector comprising a radiation detector plane which intersects the radiation beam on the radiation detector plane, the radiation detector configured to detect an intersection position of the radiation beam on the radiation detector plane;

a fixation device configured to hold the radiation detector in proximity to the target support and hold the radiation detector plane perpendicular to the radiation beam; and

a correcting device configured to correct a relative position of the radiation beam and the target support, based on the detected intersection position on the radiation detector plane.

20. The apparatus of claim 19 wherein the radiation detector plane has a longitudinal axis and the fixation device holds the longitudinal axis of the radiation detector plane parallel to the target support.

21. A radiation therapy apparatus configured to align a radiation beam with a target receiving therapy, the radiation therapy apparatus comprising:

a target support configured to immobilize the target;

a radiation detector comprising a radiation detector plane, the radiation detector plane comprising an X axis corresponding to a first dimension, and a Y axis corresponding to a second dimension, wherein the radiation detector is configured to detect an intersection position of the radiation beam along the X axis and along the Y axis of the radiation detector plane; and

a correcting device configured to correct a relative position of the radiation beam and the target support, based on the detected intersection position of the two-dimensional radiation detector plane.

22. The apparatus of claim 21 wherein the planar surface of the radiation detector has a longitudinal axis and the fixation device holds the longitudinal axis of radiation detector parallel to the target support.

23. The apparatus of claim 22 wherein the fixation device is configured to hold the planar detection surface perpendicular to the radiation beam.

24. A method for positioning a target receiving therapy relative to a radiation beam, the method comprising:

directing a radiation beam towards the radiation detector having a planar detection surface and which radiation detector is fixed to a target support configured to immobilize the target receiving therapy;

determining an intended intersection point of a radiation beam on the radiation detector plane of the radiation detector, wherein the intended intersection point is defined by a two-dimensional coordinate system of the radiation detector;

determining an actual intersection point of the radiation beam with the radiation detector plane of the radiation detector, wherein the actual intersection point is defined by the two-dimensional coordinate system of the radiation detector; and

applying a correction to a relative position between the radiation beam and the radiation detector plane of the radiation detector so the actual intersection point coincides with the intended intersection point.

25. The method of claim 24 wherein the method further comprises moving the radiation beam so that the beam hits the planar radiation detector at the intended intersection point.