Patent Document ID: 9508145
Application ID: 14001695
Patent Status: 1

Claim One:
1. Data processing method for use in the field of radiation therapy and for determining a relative position between a position of a bony structure and a reference position at a monitoring time after an alignment, the relative position being referred to as monitoring bone position, wherein an anatomical structure of an associated patient includes the bony structure and a treatment body part to be treated by at least one treatment beam of an associated treatment device, the reference position having a defined relative position with respect to an actual arrangement of at least one position of the at least one treatment beam; the data processing method being constituted to be performed by a computer and comprising: providing cone beam computed tomography (CBCT) image data describing a three-dimensional CBCT image of the bony structure, the CBCT image representing the bony structure at a pre-alignment time before the alignment; providing x-ray image data describing at least one two-dimensional x-ray image of the anatomical structure, the at least one two-dimensional x-ray image representing the bony structure and the x-ray image data being generated at the monitoring time; providing imaging position data comprising at least one of CBCT position data and x-ray geometry data, CBCT position data describing the relative position between the CBCT image and the actual arrangement and x-ray geometry data describing a positional relationship between the actual arrangement and at least one imaging geometry, referred to as x-ray imaging geometry, given for generating the at least one x-ray image; and, determining the relative position between the bony structure and the reference position at the monitoring time on the basis of the CBCT image data, the x-ray image data and the imaging position data, wherein the determining the relative position between the position of the bony structure and the reference position comprises: determining at least one two-dimensional digitally reconstructed radiograph from the three-dimensional CBCT image which matches the at least one x-ray image, the matching at least one two-dimensional digitally reconstructed radiograph resulting from a simulation of at least one imaging geometry given for generating the at least two-dimensional digitally reconstructed radiograph, the imaging geometry being referred to as matching imaging geometry, wherein the matching is performed based on the bony structure shown in both the at least one two-dimensional digitally reconstructed radiograph and the at least one x-ray image; based on the matching, determining a relative position between the at least one matching imaging geometry and the at least one position described by the imaging position data, the relative position being referred to as matching position; and determining the monitoring bone position based on the imaging position data, the matching position and the position of the bony structure within the CBCT image described by the CBCT image data.