Dose reconstruction during radiation therapy

摘要

A method for the reconstruction of a dose administered in an object to be irradiated includes providing a radiation therapy device. The radiation therapy device includes a therapeutic radiation source for emitting a therapeutic treatment beam, a portal detector opposing the therapeutic radiation source for recording measurement data of the treatment beam once the therapeutic radiation source has left the object to be irradiated, and a single or multi slice computed tomography scanner having a kV x-ray source and an opposing kV detector for producing a computed tomography of the object positioned in the radiation therapy device. The method also includes recording a computed tomography image of the object to be irradiated with the computed tomography scanner, and using the computed tomography image in order to reconstruct a dose administered to the object from measurement data of the portal detector.

主权项

1. A method for the reconstruction of a dose administered to an object to be irradiated, the method comprising:
recording a computed tomography image of the object to be irradiated with a single or multi slice computed tomography scanner, the single or multi slice computed tomography scanner comprising a kV x-ray source and an opposite kV detector for producing a computed tomography of the object positioned in a radiation therapy device; recording measurement data of a therapeutic treatment beam with a radiation therapy device, the radiation therapy device comprising a therapeutic radiation source for emitting the therapeutic treatment beam and a portal detector opposing the therapeutic radiation source for recording measurement data of the treatment beam once the treatment beam has left the object to be irradiated, the measurement data including portal images recorded during treatment; and reconstructing the dose administered to the object from the portal images recorded during treatment and the computed tomography image, wherein the reconstructing comprises:
converting the portal images to energy fluences; andbackprojecting the energy fluences using the computed tomography image as a model.