Method for localization and identification of structures in projection images

US11284846B2 · kind B2 · utility

Assignees

• The John Hopkins University · US
• Siemens Aktiengesellschaft · DE

Inventors

• Rainer Graumann · Annaberg-Buchholz, DE
• Gerhard Kleinszig · Forchheim, DE
• Yoshito Otake · Tochigi, JP
• Jeffrey H. Siewerdsen · Baltimore, US

Key dates

• Filing date: Oct 31, 2011
• Grant date: Mar 29, 2022
• Expiry date: Sep 14, 2034

Classification

• Technology area (CPC G): Physics
• CPC primary: G06T2207/30012
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A method for localization and identification of a structure in a projection image with a system having a known system geometry, includes acquiring a preoperative computer-tomography or CT image of a structure, preprocessing the CT-image to a volume image, acquiring an intraoperative two dimensional or 2D X-ray image, preprocessing the 2D X-ray image to a fix image, estimating an approximate pose of the structure, calculating a digitally reconstructed radiograph or DRR using the volume image, the estimated pose and the system geometry, and calculating a correlation between the generated DRR and the fix image, with a correlation value representing matching between the generated DRR and the fix image. The method significantly decreases the number of wrong-level surgeries and is independent of the surgeon's ability to localize and/or identify a target level in a body.