公开(公告)号：WO2018158380A1

公开(公告)日：2018-09-07

申请号：PCT/EP2018/055069

申请日：2018-03-01

Applicant: VARIAN MEDICAL SYSTEMS INTERNATIONAL AG

Inventor： ANSORGE, Reto ,  LEHMANN, Mathias ,  THIEME-MARTI, Stefan J.

IPC: A61N5/10

Abstract: Systems and methods for determining beam asymmetry in a radiation treatment system using electronic portal imaging devices (EPIDs) 112 without implementation of elaborate and complex EPID calibration procedures. The beam asymmetry is determined based on radiation scattered from different points in the radiation beam and measured with the same region of interest ROI of the EPID.

公开(公告)号：WO2020200839A1

公开(公告)日：2020-10-08

申请号：PCT/EP2020/057778

申请日：2020-03-20

Applicant: VARIAN MEDICAL SYSTEMS INTERNATIONAL AG

Inventor： ROSE, Steven ,  LEHMANN, Mathias ,  GRAF, Andres

IPC: A61N5/10 ,  A61B6/04 ,  A61B6/00

Abstract: An image acquisition apparatus includes: a positioner controller communicatively coupled to a positioner, wherein the positioner controller is configured to generate a control signal to cause the positioner to rectilinearly translate a patient support 14 relative to an imager 80, and/or to rectilinearly translate the imager relative to the patient support; an imaging controller configured to operate the imager to generate a first plurality of two-dimensional images for a patient 28 while the patient is supported by the patient support, and while the positioner rectilinearly translates the patient support and/or the imager; and an image processing unit configured to obtain the first plurality of two-dimensional images and arrange the two-dimensional images relative to each other to obtain a first composite image.

公开(公告)号：WO2021198084A1

公开(公告)日：2021-10-07

申请号：PCT/EP2021/057965

申请日：2021-03-26

Applicant: VARIAN MEDICAL SYSTEMS INTERNATIONAL AG

Inventor： LEHMANN, Mathias ,  ANSORGE, Reto ,  WASER, Manuel ,  MORF, Daniel

IPC: A61B6/00 ,  A61N5/10 ,  G01N23/046 ,  H04N5/341 ,  A61B6/03 ,  A61B6/032 ,  A61B6/40 ,  A61B6/4085 ,  A61B6/42 ,  A61B6/4233 ,  A61B6/4266 ,  A61B6/4283 ,  A61B6/5205 ,  A61B6/583 ,  A61N2005/1061 ,  A61N5/1049 ,  A61N5/1077 ,  G01N2223/401 ,  G06T11/005 ,  G06T11/006 ,  G06T2211/424

Abstract: A cone-beam computed tomography (CBCT) method uses a continuous beam and an area detector to carry out fast acquisition of projection data. The acquired projection data are then reconstructed to generate tomographic images. In acquisition of the projection data, a radiation source (102) continuously irradiates a subject (112) with a cone beam (116) of radiation from a plurality of angles and an area detector (104) continuously reads out data. A CBCT system including a source operable to produce a cone beam of radiation and an area detector movable in synchrony with the source to rapidly acquire projection data for CBCT construction is also disclosed.