Siemens Aktiengesellschaft

Esther-Sabrina Platzer

Frank Deinzer

Matthias Wacker

The invention relates to a method and a device for determination of an optimum direction of projection or position for recording a number of two-dimensional projection images of an object of interest, with the two-dimensional projection images being recorded by rotation or translation of an imaging system around the object. Inventively the process is as follows: a) estimating a position of the object at a point in time; b) determining at least one optimum imaging view from which the optimum direction of projection and/or position is produced, for the position estimated under a) with the aid of previously determined measurement. Preferably the measurement is expressed as a function of a transformation which is described by a spatial object-imaging system relationship.

Method and device for determining an optimum direction of projection for recording projection images

A three-dimensional volume data record contains a vascular tree. A two-dimensional projection image is an image of an actual fill state, to which the vascular tree is filled with a contrast agent at an acquisition time. The volume data record and the projection image are registered in relation to one another by means of the set of imaging parameters. A computation facility determines an expected target fill state, which describes which parts of the vascular tree should be filled with contrast agent at acquisition time in the three-dimensional volume data record. The computation facility determines the set of imaging parameters based on the target fill state and the projection image.

Registration method with three-dimensional representation of a vascular tree as a function of blood flow

The invention relates to a method for determining a probability distribution with local three-dimensional resolution for a substance in a vascular system. An acquisition time is assigned to a group of x-ray images showing a presence distribution with local 2D resolution for a substance in the vascular system at the acquisition time. A first preliminary presence probability distribution is determined using the x-ray images assigned to the acquisition time and a volume data set of the vascular system. A second preliminary presence probability distribution is determined using the presence probability distribution for the preceding acquisition time and a migration probability distribution with the substance migrating from first vascular locations to second vascular locations. A high individual probability to vascular locations is assigned if both preliminary presence probability distributions have a high probability value for the respective vascular location. Otherwise a lower and greater than zero individual probability is assigned.

Method for determining a temporal profile of a probability distribution with local three-dimensional resolution for the presence of a substance in a vascular system

A computer receives a volume data set describing a vascular system with local three-dimensional resolution and a temporal sequence of groups of x-ray images. An acquisition time is assigned to each group of x-ray images comprising at least one x-ray image. Each x-ray image shows an actual presence distribution with local two-dimensional resolution for a substance in the vascular system, as defined at the respective acquisition time. The computer uses an initial presence distribution with local three-dimensional resolution for the substance, as defined for a start time, to determine further presence distributions with local three-dimensional resolution for the substance automatically for determination times by iterative resolution of fluid dynamics movement equations, which are per se location-independent. It automatically corrects the further presence distributions, if their respective determination time corresponds to one of the acquisition times, based on the temporally corresponding group of x-ray images.

Method for determining presence distributions with local three-dimensional resolution for a substance in a vascular system and corresponding facilities

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Jena, Germany

Esther-Sabrina Platzer