X-ray system error tracking and calibration

US11419571B2 · kind B2 · utility

Assignee

• KONINIKLIJKE PHILIPS N.V. · NL

Inventors

• Christian Haase · Hamburg, DE
• Michael Grass · Hanstedt, DE
• Dirk Schäfer · Hamburg, DE

Key dates

• Filing date: Apr 5, 2019
• Grant date: Aug 23, 2022
• Expiry date: Jun 21, 2039

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61B6/4464
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

Mechanical image acquisition systems (such as medical C-arms) frequently accumulate geometrical errors which must be calibrated out using a calibration phantom. A more frequent regime of system calibration implies a less frequent use of the C-arm for clinical applications. The present application proposes to identify common biases between the acquired projection frame sequences from the same mechanical image acquisition system in first and second acquisitions, and to compare this to expected calibration data of the mechanical image acquisition system to generate frame deviation measures. If a resemblance between the first and second sequences of frame deviation measures is obtained, one or more calibration actions are performed (such as alerting the user that calibration should be provided, and/or automatically correcting for the geometry deviation).