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Method of calibrating a positioning system in a radiation therapy system

一种放射治疗、定位系统的技术，应用在放射疗法、治疗、X射线/γ射线/粒子照射疗法等方向，能够解决定位系统制造昂贵、制造成本增加等问题，达到减少工作量和所需的空间的效果

Active Publication Date: 2008-05-21
ELEKTA AB
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such positioning systems would be very expensive to manufacture due to improved structural tolerances often resulting in increased manufacturing costs, especially when manufacturing systems that include cooperating moving parts

Method used

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  • Method of calibrating a positioning system in a radiation therapy system
  • Method of calibrating a positioning system in a radiation therapy system
  • Method of calibrating a positioning system in a radiation therapy system

Examples

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Embodiment Construction

[0042] Referring to FIGS. 1-6 , a radiation therapy system to which the present invention is applicable includes a radiation unit 10 and a patient positioning unit 20 . In the radiation unit 10, a radiation source, a radiation source holder, a collimator body, and an external shielding member are equipped. The collimator body includes a number of collimator channels directed at a common focal point in a manner known in the art.

[0043] The collimator body also acts as a radiation shield to prevent rays from reaching the patient except through the collimator channel. An example of a collimator arrangement suitable for use in the radiotherapy system of the present invention can be found in WO2004 / 06269 A1, the entirety of which document is hereby incorporated by reference. However, the invention is also applicable to radiation therapy systems employing other means of collimating radiation to a fixed focus, such as that disclosed in US Patent No. 4,780,898.

[0044] Patient po...

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PUM

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Abstract

Calibration of a radiation therapy system comprising a radiation unit (10) with a fixed focus point, a fixation unit (50) for fixing a treatment volume in a patient, and a positioning system (20). The positioning system (20) comprises a fixed framework (22), a movable carriage (24) for carrying and moving the entire patient, motor (s), a control system for controlling the motor (s), and at least one engagement point (30, 32) for releasably mounting the fixation unit (50) in fixed engagement with the positioning system (20). A fixation unit coordinate system defined in relation to the fixation unit (50) is provided. Linearity errors for the motional axes of the carriage (24) and the angular offset between the motional axes and the coordinate system is determined, whereby the relationships between the axes of the coordinate system and the motional axes of the positioning system (20) are determined. The positioning system is then mounted in fixed relationship with the radiation therapy unit (10) and the focus point in relation to the positioning system (20) is determined, whereby the relationship between the focus point and the coordinate system is also determined.

Description

technical field [0001] The present invention relates to the field of radiotherapy. In particular, the invention relates to a method of calibrating a positioning system in a radiotherapy system comprising a radiotherapy unit with a fixed ray focus. Background technique [0002] In recent years, great progress has been made in the development of surgical techniques. For example, for patients requiring brain surgery, non-invasive surgical procedures can be performed that involve only minimal trauma to the patient. [0003] A non-invasive surgical system based on the Leksell Gamma Knife  Sold under the name , the system provides this type of surgery using gamma rays. The radiation is emitted from a plurality of stationary radiation sources and focused towards a defined target or treatment area by means of a collimator, ie a channel or conduit, to obtain a beam of restricted cross-section. Each radiation source delivers a dose of gamma rays that is not sufficient to damage t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61N5/10
CPCA61N5/1049A61N5/1084
Inventor P·卡尔松L·海丁
Owner ELEKTA AB
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