Method for assisted beam selection in radiation therapy planning
First Claim
1. A method for selecting beam orientations in radiation therapy enabling the delivery of improved dose distributions to a planning target volume, while delivering a minimum dose to adjacent organs at risk, said method comprising the steps of:
- a) calculating the boundary angles that the interfaces between said planning target volume and said adjacent organs at risk subtend with respect to different axes of the coordinate system used for describing the patient'"'"'s anatomy,b) transforming said boundary angles to a plurality of gantry and table angles, andc) selecting one or more pairs of said gantry and table angles from said plurality of gantry and table angles.
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Abstract
A method to assist in the selection of optimum beam orientations for radiation therapy when a planning treatment volume (PTV) is adjacent to one or more organs-at-risk (OARs). A mathematical analysis of the boundaries between the PTV and OARs allows the definition of a continuum of pairs of gantry and table angles whose beam orientations have planes that are essentially parallel to those boundaries, and can, therefore, separate the PTV from the OARs when a multi-leaf collimator is used in the therapy. The Radiation Oncologist can then select one or more pairs of gantry and table angles from the continuum as input to a beam optimization step. The selected angles can deliver highly uniform dose to the PTV, while minimizing the radiation dose to the OARs.
112 Citations
14 Claims
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1. A method for selecting beam orientations in radiation therapy enabling the delivery of improved dose distributions to a planning target volume, while delivering a minimum dose to adjacent organs at risk, said method comprising the steps of:
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a) calculating the boundary angles that the interfaces between said planning target volume and said adjacent organs at risk subtend with respect to different axes of the coordinate system used for describing the patient'"'"'s anatomy, b) transforming said boundary angles to a plurality of gantry and table angles, and c) selecting one or more pairs of said gantry and table angles from said plurality of gantry and table angles. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for the assisted selection of beam orientations in radiation therapy enabling the delivery of improved dose distributions to a planning target volume, while delivering a minimum dose to adjacent organs at risk, said apparatus comprising:
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a) means for calculating the boundary angles that the interfaces between said planning target volume and said adjacent organs at risk subtend with respect to different axes of the coordinate system used for describing the patient'"'"'s anatomy, b) means for transforming said boundary angles to a plurality of gantry and table angles. c) means for selecting one or more pairs of said gantry and table angles from said plurality of gantry and table angles. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification