Method for operating an x-ray diagnostic apparatus for determining quality values

US7826651B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Stefan Böhm · Oberasbach, DE
• Peter Durlak · Erlangen, DE
• Volker Heer · Gundelsheim, DE
• Martin Kolarjk · Koblenzer Straße, DE

Key dates

• Filing date: Mar 10, 2009
• Grant date: Nov 2, 2010
• Expiry date: May 9, 2029

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S128/922
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

A method for checking an x-ray diagnostic apparatus is provided. Fluoroscopic series of x-ray images of a technical phantom are digitally acquired and stored. Difference between a dynamic image and a background image is calculated. A measuring field is predicted. Priori information about the shape of a clinically relevant object is determined. Hough transformation on a gray value image corresponding to the difference is applied. Contrast of the object from the Hough-transformed gray value image is determined. A square of the determined contrast is calculated. A noise variance is calculated by determining a sum of a noise variance of a homogenous image region and a variance of the background image. A contrast-to-noise ratio of the determined contrast and the calculated noise variance is determined. A square of the contrast-to-noise ratio is dynamically averaged. A Clinical Relevant Fluoroscopy Performance index for the x-ray diagnostic apparatus is determined.