Calculating a four dimensional DSA dataset with variable spatial resolution

US10255695B2 · kind B2 · utility

Assignee

• Siemens Healthcare Limited · DE

Inventors

• Markus Kowarschik · Koblenzer Straße, DE
• Sonja Gehrisch · Nürnberg, DE
• Kevin Royalty · Fitchburg, US
• Sebastian Schafer · Blomberg, DE
• Christopher Rohkohl · Hattingen, DE

Key dates

• Filing date: Dec 26, 2017
• Grant date: Apr 9, 2019
• Expiry date: Dec 26, 2037

Classification

• Technology area (CPC G): Physics
• CPC primary: G06T2211/404
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

A method calculates a four-dimensional DSA dataset from x-ray datasets. Each of the x-ray datasets contains a two-dimensional x-ray projection of an examination volume in relation to a direction of projection and a recording time. A first three-dimensional DSA dataset of a first reconstruction volume is determined based on the x-ray datasets. The first reconstruction volume is a part of the examination volume. A second three-dimensional DSA dataset of a second reconstruction volume is determined based on the x-ray datasets. The second reconstruction volume is a part of the first reconstruction volume. The second three-dimensional DSA dataset is segmented. The x-ray datasets are normalized based on the first three-dimensional DSA dataset. A four-dimensional DSA dataset is calculated by back projection of the normalized x-ray datasets onto the segmented second three-dimensional DSA dataset. The four-dimensional DSA dataset contains a number of third three-dimensional DSA datasets and associated time information.