Siemens Aktiengesellschaft

Siemens Healthcare Gmbh

Siemens Healthineers Ag

Stefan Böhm

Peter Durlak

Philipp Bernhardt

Boris Stowasser

Klaus Finkler

Sandra Martin

Tong Fang

Yunqiang Chen

Ti-chiun Chang

Andreas Berting

Dorin Comaniciu

Bernhard Geiger

Wei Zhang

Adrian Barbu

Volker Heer

Richard Obler

Martin Kolarjk

Richard Socher

Bogdan Georgescu

Martin Spahn

Marcus Pfister

Joachim Hornegger

Ying Zhu

Thomas Brunner

Johann Seissl

Michelle Xiaohong Yan

Stanislav Tashenov

Markus Lendl

Rudolf Leiblein

Oliver Baruth

Thomas Pohl

Markus Roβmeier

Christian Neumair

Sandra Knoth

Ralph Wössner

A vessel image, which maps a vessel structure, and a device image, which maps a device, are created. A processor, depending on the device image and the vessel image, creates an overlaying image. At least one filter algorithm is applied to the device image, creating a filtered device image. The overlaying image is created by overlaying of the vessel image with the filtered device image.

Imaging method with improved image quality

A method is provided for operating a medical X-ray device when carrying out an X-ray examination. In order to reduce the duration of the scan for the reliable determination of changes over time in a body region of an examination subject by an X-ray based subtraction method, the method includes recording a plurality of first X-ray images of a body region of an examination subject, wherein the recording of the plurality of first X-ray images ensues at a constant X-ray imaging frequency and a constant X-ray dose for each X-ray image recording. The method further includes generating a mask image, wherein the generation of the mask image includes an averaging of the plurality of first X-ray images; recording of at least one second X-ray image of the body region at a further time after the recording of the plurality of first X-ray images, wherein the recording of the at least one second X-ray image ensues at the same constant X-ray imaging frequency and the same constant X-ray dose for each X-ray image recording as for recording the first X-ray images; and generating a total image at least as a function of the mask image and of the at least one second X-ray image.

X-ray device and a method for operating an X-ray device when carrying out an X-ray examination

Embodiments provide a method for denoising time series images of a moved structure for a medical device. A movement detector detects the moved structure. The movement detector obtains a measurement of the similarity of two images that each represent the same section of the moved structure. The two images originate from two different time series images. A ratio between spatial and temporal denoising is defined for the section as a function of the measurement of the similarity.

Method for denoising time series images of a moved structure for medical devices

Operating a medical image recording device in the context of an image recording routine for a patient is provided. The image recording routine serves an image recording purpose. The image recording device is controlled based on operating parameters implemented by a controller of the image recording device. The operating parameters are identified completely automatically by an identification algorithm from input data describing at least the patient in the form of a patient model and/or the image recording purpose, and from a registration of the patient with a coordinates system of the image recording device. The operating parameters are used to control the image recording device. An examination region that is to be recorded for the patient and the image recording purpose are derived based on the registration.

Operating a medical image recording device

The disclosure relates to a method and an imaging device for generating a new roadmap image of a target object. For the method, a first subtraction image is generated from a first mask image and a contrast agent image of the target object. A parameter value of a parameter of the imaging device that affects the acquisition of images by the device is then changed. A third mask image of the target object is acquired automatically by the imaging device using the changed parameter value. From a second examination image subsequently acquired using the changed parameter value, a third subtraction image is generated by subtraction of the third mask image. The new roadmap image is generated using the first subtraction image and the third subtraction image.

Method and imaging device for generating a roadmap image

A method to optimally set a position of a form filter in an x-ray image recording apparatus is proposed. The x-ray image recording apparatus has an x-ray radiation source and an x-ray radiation detector. An x-ray image is firstly recorded in a first position of the form filter. A new position of the filter is then calculated and automatically set with the aid of the x-ray image. A new x-ray image is then recorded. With a minimal dose of a patient, the method enables low contrast images to be recorded for a minimal main dose of the patient, in particular in a sequence.

Method for obtaining image data with the aid of an x-ray image recording apparatus having a filter and an x-ray image recording apparatus

The invention relates to a method for determining a position for at least one semi-transparent diaphragm during a radiological observation of a body region of a patient by means of a radiological facility, in particular during an observation accompanying an interventional measure, comprising: producing at least one radiological image recording and/or a sequence of image recordings by means of the radiological facility; analyzing the image recording and/or the sequence of image recordings by means of automatic image processing by a computing facility for identifying less absorbent image regions which may be present; and automatically determining the position for the at least one semi-transparent diaphragm as a function of the image analysis result by means of the computing facility.

Method for determining a position for at least one semi-transparent diaphragm and associated facility

A method for enhancing stent visibility in digital medical images includes providing a time series of 2-dimensional (2D) images of a stent in a vessel, estimating motion of the stent in a subset of images of the time series of images, estimating motion of clutter in the subset of images, where clutter comprises anatomical structures other than the stent, estimating a clutter layer in the subset of images from the estimated clutter motion, estimating a stent layer in the subset of images from the clutter layer and the estimated clutter motion, and minimizing a functional of the estimated stent motion, the estimated stent layer, the estimated clutter motion, and the estimated clutter layer to in calculate a refined stent layer image, where the refined stent layer image has enhanced visibility of the stent.

System and method for multi-image based stent visibility enhancement

A virtual map of vessels of interest in medical procedures, such as coronary angioplasty is created so that doses of contrasting agent given to a patient may be reduced. A position of a coronary guidewire is determined and locations of vessel boundaries are found. When the contrast agent has dissipated, virtual maps of the vessels are created as new images. The locations of the determined vessel boundaries are imported to a mapping system and an image obtained without using a contrast agent is modified based on the imported locations of vessel boundaries. This creates a virtual map of the vessels.

Methods and apparatus for virtual coronary mapping

A method for temporally filtering medical images during a fluoroscopy guided intervention procedure includes providing a mask image, a fluoroscopy intervention image acquired at a current time during a medical intervention procedure, forming a subtraction image by subtracting the mask image from the intervention image, calculating a motion image of a moving structure in the subtraction image, forming a residual image by subtracting the motion image from the subtraction image, temporally filtering the residual image with a filtered image from a previous time, and adding the motion image to the temporally filtered residual image.

System and method for decomposed temporal filtering for X-ray guided intervention application

The invention relates to a method for noise suppression in medical images comprising steps of measuring the gradient field strength of an image pixel and selecting a suitable filter mask for noise suppression as a function of the gradient field strength, with the value of the gradient field strength being compared with a predetermined threshold value. The method is repeated when an additional image pixel is selected. A decision is made per read-in image pixel as to which type of filter mask is used for filtering. A selection can be made between filter masks of different sizes or isotropic or anisotropic or directional filter masks. The decision is based on the measured gradient field strength of the respective pixel. The use of different filter masks allows the signal-to-noise ratio to be improved, without distorting structures like edges for instance and without generating artificial structures in homogenous noise regions.

Method and device for noise suppression in medical images

Modern image processing systems for the postprocessing of X-ray images require a large number of input parameters and take a great deal of time. So that calculations do not need to be made sequentially for different sets of input parameters, parallel processors are used, in which the same image processing program is executed in each case, but with different input parameters in each case. A large number of processed X-ray images is thus obtained, which in particular can also be displayed simultaneously. From the multiple processed x-ray images, a repeated postprocessing of a processed x-ray image can take place by mixing.

Method for providing variously processed image data and X-ray image system

The invention relates to a method for presentation of medical images by a reproduction facility of a diagnostic device with suppression of the noise with the following steps: one-off calibration of the signal-dependent noise; separation of the signal and noise components in the image; adaptation of the two components according to set parameters; and composition of the signals.

Procedures for the presentation of medical images

A method and system for vessel segmentation in fluoroscopic images is disclosed. Hierarchical learning-based detection is used to perform the vessel segmentation. A boundary classifier is trained and used to detect boundary pixels of a vessel in a fluoroscopic image. A cross-segment classifier is trained and used to detect cross-segments connecting the boundary pixels. A quadrilateral classifier is trained and used to detect quadrilaterals connecting the cross segments. Dynamic programming is then used to combine the quadrilaterals to generate a tubular structure representing the vessel.

Method and system for vessel segmentation in fluoroscopic images

A method for setting a control variable of a filter for noise reduction in medical images is provided. Image data of the medical images is classified into at least one noise region and at least one structure region. A variance measurement is performed either for all the image pixels or a subset of them to determine the edge thicknesses. A histogram is generated from the edge thicknesses. The maximum of the histogram is determined and a Gaussian curve is fitted to the histogram. A threshold value for noise and structure is determined as a function of the standard deviation of the Gaussian curve. The noise and structure are measured in the regions. The standard noise and structure deviations are determined and compared. The control variable is setup as a function of the comparison of noise and structure. The invention can be used for reduction of temporal noise in bandpass images.

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Oberasbach, Germany

Stefan Böhm