Computed tomography system and method for tracking a bolus

US9047702B2 · kind B2 · utility

Assignee

• KONINIKLIJKE PHILIPS N.V. · NL

Inventors

• Holger Schmitt · Berlin, DE
• Michael Grass · Hanstedt, DE

Key dates

• Filing date: Jan 4, 2012
• Grant date: Jun 2, 2015
• Expiry date: May 19, 2032

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61B6/504
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

The present invention relates to a computed tomography system (10) and a corresponding method which enable tracking of a contrast material bolus and which involve a reduced radiation dose. The proposed computed tomography system (10) comprises an acquisition unit including an X-ray source (18) and an X-ray detector (30) for acquiring projection data sets (42, 44, 46), a reconstruction unit (41) for reconstructing a planning image (48) from a first projection data set (42), an identification unit (52) for identifying a region of interest (40) in the planning image (48), a selection unit (54) for selecting a projection angle (60) through the region of interest (40), a calculator (62) for calculating a target projection value (64) for a projection of said region of interest (40) with the selected projection angle (60), a control unit (32) for controlling said acquisition unit to acquire a second, reduced projection data set (44) including projection data from projections of said region of interest (40) with the selected projection angle (60), and a comparator (68) for comparing projection values of the second projection data set (44) with the target projection value (64), wherein the …