Siemens Aktiengesellschaft

Siemens Healthcare Gmbh

Siemens Aktiengesellschaft-Muenchen

Thomas Brunner

Bernd Schreiber

Holger Kunze

Benno Heigl

Frank Deinzer

Michael Zellerhoff

Karl Wiesent

Alois Nöttling

Christoph Köhler

Michael Maschke

Klaus Klingenbeck-Regn

Michael Manhart

Joachim Hornegger

Bernhard Scholz

Stefan Böhm

Peter Durlak

Karl Barth

Matthias Mitschke

Ernst-Peter Rührnschopf

Lutz Blohm

Michael Pflaum

Florian Vogt

Norbert Karl Strobel

Michael Martens

Sebastian Graf

Jürgen Franke

David Wenzel Kaltenbacher

Christian Neumair

Michele Kiessling

First projection images are recorded. The first projection images map an examination object along different first projection directions. A corresponding respective second projection image is recorded for at least two first projection images. The first projection images each have a first focus point, and the second projection images each have a second focus point. Each of the second projection images together with a corresponding first projection image at least partially map a common part of the examination object about a stationary center point. The second projection images map the examination object along second projection directions that are mutually different and at least partially different, relative to the respectively corresponding first projection directions such that a straight line through the first focus point and the second focus point of the mutually corresponding first projection images and second projection images extends through the stationary center point. The 3D image dataset is reconstructed.

Providing a 3D image dataset of an examination object

A method and an apparatus for generating an output image from a volume data set that includes a plurality of voxels are provided. In the method, a rendered 2D image is generated from the volume data set by volume rendering. In order to generate an output image with adjusted brightness, which makes a manual readjustment of the brightness superfluous, an adjustment factor is determined based on a brightness value of pixels in the rendered 2D image. By multiplying a respective voxel brightness value of the voxels in the volume data set by the adjustment factor, a brightness-adjusted volume data set is generated. By volume rendering from the brightness-adjusted volume data set, the brightness-adjusted output image is generated.

Method and apparatus for generating an output image from a volume data set

A method for determining a three-dimensional image dataset by an X-ray device is disclosed herein. The method includes recording projection images of an examination object from a plurality of recording angles, and reconstructing the image dataset from the projection images, wherein, for at least one examined projection image, in each case an interference condition is evaluated the fulfillment of which is dependent upon at least parts of the image data of the (respective) examined projection image and/or upon at least one parameter of the radiation source during the recording of the (respective) examined projection image and indicates that the (respective) examined projection image is a projection image with interference during the recording of which arcing has occurred in the radiation source. The method also includes disregarding at least one projection image with interference, or giving the projection image a lower weighting than all the projection images with no interference, or replacing the projection image with a synthetic projection image.

Method for determining a three-dimensional image dataset by an X-ray device

A method for collecting three-dimensional data of an object from a series of projection images recorded by a biplane C-arm system is provided. A cardiac activity is recorded. The cardiac frequency and a start cardiac phase are determined for calculating parameters of the C-arm planes. The C-arm planes are set with the parameters and data is acquired in the start cardiac phase. The C-arm planes are uniformly rotated at a same speed in a forward motion over an angular area and record data at different angular areas at different cardiac phases. Data is acquired in the start cardiac phase after termination of the forward motion. The C-arm planes are uniformly rotated at a same speed in a backward motion over an angular area and records data at different angular areas at different cardiac phases. The captured data are reconstructed after termination of the backward motion upon completed acquisition.

Method for 3-D data collection with a biplane C-arm system with biplane acquisition multiplexing

To allow safe treatment of a patient, in particular a puncture or biopsy using a needle, a 2D sectional image of an implant plane and a further 2D sectional image of an orthogonal plane are generated from a 3D image data record of a region to be examined. The two planes are hereby oriented such that the needle is on the one hand located within the implant plane and on the other hand is oriented in a perpendicular manner in respect of the orthogonal plane. The parallel display of the 2D images allows the doctor to acquire the relative position of the needle in relation to the region to be examined in a simple and intuitive manner.

Method for displaying a medical implant in an image and a medical imaging system

The invention relates to a method for evaluating an image dataset obtained by a radiation-based image acquisition device. A scatter background dataset is determined as a function of the image data. The image dataset is corrected pixel by pixel by multiplying the image dataset with the inverse of a function dependent on the quotient of the scatter background data and the image data at a respective pixel. The function is a nonlinear, smooth function determined by a coefficient and having positive derivatives. The absolute value of the function is one for the value zero. The image acquisition parameter dependent coefficient is determined by an optimization process.

Method for evaluating an image dataset acquired by a radiation-based image acquisition device

In a method and system for dual rendering of images, a first volume image is reconstructed with a computer. A second volume image is reconstructed with the computer. The first reconstructed volume image is adjusted for a desired rendering. The second volume image is adjusted for desired rendering. A dual rendering of the first and second volume images is displayed where one of the volume images can be seen through the other volume image. Also, a simultaneous generation of different types of reconstructed data sets out of a single acquisition run for those data sets corresponding to the dual rendered images is provided for. The diagnostic questions is shown in FIG.

Simultaneous generation of different data sets from a single acquisition run and dual rendering of images

In the acquisition of an image series with an x-ray image acquisition that has an x-ray C-arm rotatable around a center point, movement of the patient table is updated so that table is brought into a specific position calculated relative to the angle position of the x-ray C-arm. This position of the patient table is determined as follows. An envelope is established and a point is established that is the center point of a region of interest. In each position of the patient table that matches the position of the x-ray C-arm, the flat panel detector is perpendicular to a line emanating from the point and simultaneously contacts (is tangent to) the envelope. The region of interest is thereby optimally imaged in the image series so that a good 3D reconstruction can be obtained.

Method and system for acquiring projection for 3D reconstruction of an off-center ROI

The invention relates to a method for generating a 3D reconstruction of an especially large body that cannot be captured by a single projection by capturing at least two projections, which together capture the body, at each of the positions taken up by a C-arm X-ray unit. Data from the two projections is projected onto a virtual detector and the data from the virtual detector is then used for the filtered back projection procedure. It is assumed here that the real source remains motionless and that only the detector moves. A virtual detector D'/D&#x2032; is only used in order to carry out large scale filtering in the event that real sources Qand Qfor the two projections do not coincide. A return is then made to two independent projections. These two independent projections are used separately in the filtered back projection procedure to generate the 3D reconstruction.

Method for generating a 3D reconstruction of a body

The invention relates to an angiographic x-ray diagnostic device for rotation angiography with an x-ray emitter which can be moved on a circular path about a patient located on a patient support table, with an image detector unit which can moved on the circular path facing the x-ray emitter, with a digital image system for recording a plurality of projection images by means of rotation angiography, with a device for image processing, by means of which the projection images are reconstructed into a 3D volume image, and with a device for correcting physical effects and/or inadequacies in the recording system such as truncation correction, scatter correction, ring artifact correction, correction of the beam hardening and/or of the low frequency drop for the soft tissue display of projection images and the 3D volume images resulting therefrom.

Angiographic x-ray diagnostic device for rotation angiography

The invention relates to a method and an apparatus for reconstructing a three-dimensional image volume from two-dimensional projection images of a subject which have been taken from different projection directions by rotating the recording system around the subject, wherein the grayscale values of the voxels of the image volume are calculated by back projection of the projection images. The invention is characterized in that prior to back projection at least one projection image is modified in such a way that it corresponds to a projection image taken with a virtual detector whose axes are aligned parallel to the rotational axis of the recording system.

Method and apparatus for reconstructing a three-dimensional image volume from two-dimensional projection images

The invention relates to a method, which assists the doctor in orientation in 2D fluoroscopy images. The invention relates to a method for contour visualization of regions of interest in fluoroscopy images by: firstly generating a 3D raw data set comprising at least one region of interest in which the contour of the at least one region of interest is visible, secondly generating a segmented 3D data set from the 3D raw data set in which the contour in at least one region of interest is clearly delimited, thirdly generating a 2D fluoroscopy image which contains the at least one region of interest, fourthly generating a 2D projection from the segmented 3D data set which is congruent with the 2D fluoroscopy image, fifthly determining the optionally approximated contour of the at least one region of interest in the 2D projection, and finally overlaying the contour with the 2D fluoroscopy image.

Method for contour visualization of regions of interest in 2D fluoroscopy images

When recording an image sequence, it is possible to deviate from passing through a perfect curve path. There is described how an alternative curve path can be determined. An envelope is determined, a point is determined, which is the center point of the region of interest and then the detector is moved such that it is at right angles in each instance to a line which emanates from the point and simultaneously touches the envelope tangentially. As a result, the region of interest is mapped as optimally as possible in the image sequence so that as good a 3D reconstruction as possible can be obtained.

Method for generating an image sequence for a 3D reconstruction

In a method for reconstructing a 3D CT image from a number of 2D projection images each 2D projection image is divided at an arbitrarily selectable position by a substantially vertical image line and the projection image is automatically electronically analyzed to detect whether clipping occurs on the left side or on the right side, or on both sides, of the image line. For each side of the image line at which clipping is detected, a horizontal coordinate at which the clipping ends is identified. The grayscale values at the side of the horizontal coordinate opposite to the side at which the image line is located are extrapolated so that the clipping is removed. The corrected 2D projection images are then used to reconstruct a 3D image, in which capping artifacts, that would otherwise be present, or avoided or substantially minimized due to the corrections made in the 2D projections.

Method for correcting image artifacts due to detector overexposure in computed tomography

In a method for reconstructing a three-dimensional subject a number of projections of a three-dimensional subject is acquired by an acquisition arrangement. Each projection is a dataset of spatially contiguous data values. The projections are provided to a computer. A first part of the data values of the projections is replaced by new data values, and a second part of the data values of the projections remains unchanged. Thus changed projections are generated, using which a reconstruction of an image of the subject is determined by the computer.

Growing community of inventors

Nürnberg, Germany

Thomas Brunner