Patent ID: 8965092
Filing Date: 2015-02-24
Classification: A61B,G06K

Abstract:
1. A control unit to control a high-energy tomosynthesis scan in a contrast agent-assisted dual-energy tomosynthesis of an examination subject, said control unit comprising: an acquisition unit configured to acquire image data from at least one low-energy tomosynthesis scan of an examination subject; an evaluation unit supplied with said image data and configured to automatically evaluate said image data to identify a grayscale value for each volume segment of the examination subject represented in said image data; a determination unit configured to determine at least one projection angle at which the low-energy tomosynthesis scan was implemented and the high-energy tomosynthesis scan is to be implemented; a calculation unit configured to calculate, for each projection angle determined by the determination unit, a target grayscale value based on all grayscale values for all volume segments represented by said image data that fall within a radiation region of the respective projection angle; said calculation unit being configured to access a memory in which an association table is stored, said association table comprising at least one operating parameter, selected from the group consisting of a tube current-time product value, and a high voltage value, respectively associated with different stored grayscale values, to identify one of said stored grayscale values that corresponds to the target grayscale value, and to select said at least one operating parameter from the association table that is respectively associated with said one of said stored grayscale values as a selected at least one operating parameter that will produce said target grayscale value in said high-enemy tomosynthesis scan for each projection angle determined by said determination unit; and said calculation unit being configured to operate said acquisition unit to implement said high-energy tomosynthesis scan using said selected at least one operating parameter for each projection angle determined by said determination unit selected from said table.