Method of calibration of a stereoscopic camera system for use with radio therapy treatment apparatus

A technology of a stereoscopic camera system and a treatment device, which is applied in the fields of radiodiagnostic equipment, radiation therapy, X-ray/γ-ray/particle irradiation therapy, etc.

Active Publication Date: 2016-04-06
VISION RT LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] Although traditional methods of calibrating stereo camera systems for use with radiation therapy treatment devices are highly accurate, further improvements in accuracy are desired

Method used

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  • Method of calibration of a stereoscopic camera system for use with radio therapy treatment apparatus
  • Method of calibration of a stereoscopic camera system for use with radio therapy treatment apparatus
  • Method of calibration of a stereoscopic camera system for use with radio therapy treatment apparatus

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Embodiment Construction

[0039] figure 1 is a schematic perspective view of the treatment system. The treatment system includes a set of stereo cameras 10 connected to a computer 12 by wiring (not shown). The computer 12 is also connected to a treatment device 14, such as a linear accelerator, that delivers radiation therapy. A mechanical bed 16 is used as part of the treatment device. The treatment device 14 and the mechanical bed 16 are configured such that under the control of the computer 12, the relative positions of the mechanical bed 16 and the treatment device 14 can be varied laterally, vertically, longitudinally and rotationally, as shown near the bed in the accompanying drawings indicated by the arrow. Additionally, the treatment device 14 is also capable of rotating about an axis, as indicated by the arrow in the center of the device in the figures.

[0040] Computer 12 is configured to process images acquired by stereo camera 10 to generate 3D wire mesh computer models of the surfaces...

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Abstract

A method of calibration of a stereoscopic camera system (10,12) for use with a radio therapy treatment apparatus (14) is provided. Initially a calibration phantom (18) is positioned on an adjustable table (20) on the surface of a mechanical couch (16) with the phantom's centre at an estimated location for the iso-centre of a radio therapy treatment apparatus (14). The calibration phantom (18) is then irradiated using the radio therapy treatment apparatus (14) and the relative location of the centre of the calibration phantom and the iso-centre of the radio therapy treatment is determined by analysing images of the irradiation of the calibration phantom (18). The calibration phantom (18) is then repositioned by the mechanical couch (16) applying an offset corresponding to the determined relative location of the centre of the calibration phantom and the iso-centre of the radio therapy treatment apparatus (14) to the calibration phantom (18). The stereoscopic camera system (10,12) then proceeds to obtain images of the relocated calibration phantom (18) to which the offset has been applied and processes the obtained images to set the co-ordinate system of the stereoscopic camera system (10,12) relative to the iso-centre of the radio therapy treatment apparatus (14).

Description

technical field [0001] The invention relates to a calibration method for a stereo camera system. In particular, embodiments of the invention relate to a calibration method for a stereo camera system for use with a radiotherapy treatment device. Background technique [0002] Radiation therapy involves projecting beams of radiation onto predetermined areas of a patient's body to destroy or eliminate tumors present therein. This treatment is usually given on a regular and repeated basis. In every medical intervention, the radiation source must be positioned relative to the patient so as to irradiate selected areas with the highest possible precision to avoid irradiating adjacent tissues to which the radiation beam would be harmful. [0003] A fundamental problem with radiation therapy is the need to position the patient in the same position when a diagnostic image is acquired and each time radiation is delivered to the patient's body thereafter. To achieve this goal, Vision ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61N5/10A61B6/00G06T7/00
CPCA61N5/1049A61N2005/1076A61B6/584G06T7/85A61N5/1075A61N2005/1059G06T7/0012G06T2207/30004
Inventor I·玫尔M·艾伦G·哈利N·史密斯R·贺维
Owner VISION RT LTD
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