Patent ID: 9269137
Filing Date: 2016-02-23
CPC Classification: A61N,G06F,G06K,G06T,G16H

Claim Text:
1. A method of evaluating treatment parameters for a patient undergoing radiotherapy, wherein a portal imaging device is located under the patient such that a radiation beam passes through the patient to the portal imaging device, the method comprising: obtaining from a radiotherapy treatment plan a planning image of the patient prior to radiotherapy, the planning image including a target region of the patient; obtaining a portal image during radiotherapy treatment from the portal imaging device, the portal image corresponding to the target region of the patient; generating, by a processor, a difference image identifying one or more differences between the planning image and the portal image; accessing a database configured to store a plurality of prior portal dosimetry images identifying differences between prior planning images and prior portal images and one or more corresponding assessments of the prior portal dosimetry images; selecting, by the processor, one or more prior portal dosimetry images from the database based on at least one or more of a disease, a plan type, a treatment region, a treatment characteristic; comparing, by the processor, the difference image to the one or more prior portal dosimetry images from the database; performing a similarity measurement, by the processor, between the difference image and the one or more prior portal dosimetry images; selecting, by the processor, one prior portal dosimetry image based on the similarity measurement; providing, by the processor, an indication of either a true positive difference or a false positive difference based on the selected prior portal dosimetry image, wherein the indication includes a list, based on whether the indication is a true positive difference or a false positive difference, of possible causes for a difference between the planning image and the portal image; and determining, by the processor, whether radiation was delivered during radiotherapy as planned based on the difference image.