Palodex Group Oy

Ge Healthcare Finland Oy

Other

Instrumentarium Corporation

Palodex Grou Oy

Martti Kalke

Samuli Siltanen

Esa Suuronen

Matti Lassas

Joonas Erik Sandholm

Jari Taskinen

Esa Kalevi Eronen

Markus Kristian Rintamäki

Jari Kaipio

Maaria Rantala

Kaapo Paulanto

Ville Kolehmainen

Henri Setälä

Markus Rintamäki

Petri Jouhikainen

Juuso Siren

Tuomas Tölli

Simopekka Vänskä

Henri SETÄLÄ

Ville Petteri Kolehmainen

The application relates to an X-ray imaging unit () for X-ray imaging. The unit comprise a processor part (), a gantry part (), an X-ray source part () for emitting X-rays, and an X-ray imaging detector part () for receiving the X-rays from the source part. The gantry part comprises the source and detector parts. The processor part is configured to control the source and detector parts in order to obtain () an image data. The processor part is further configured to determine () at least one reference structure () of a patient () from the image data and determine () a position of a head () of the patient on a grounds of the at least one reference structure.

X-ray imaging unit for X-ray imaging

A system and method of x-ray imaging includes obtaining a plurality of x-ray projection images of a patient. At least one object in the plurality of x-ray projection images is identified. A priori information of the identified at least one object is obtained. A three dimensional volume is reconstructed from the plurality of x-ray projection images. The a priori information is used to refine the acquisition of x-ray projection images or presentation of the three dimensional volume.

System and method of artifact correction in 3D imaging

X-ray imaging systems and methods for exposure control in three-dimensional X-ray imaging include acquiring at least one image with an X-ray emitter and an X-ray receiver. At least one physical characteristic of the object to be imaged is determined from the at least one image. At least one exposure parameter value based is determined based upon the at least one physical characteristic of the object to be imaged. The X-ray emitter and X-ray receiver acquire a plurality of projection images about the object to be imaged using at least one exposure parameter value. A three-dimensional X-ray image is reconstructed from the plurality of projection images.

Systems and methods of automated dose control in x-ray imaging

A medical imaging assembly includes a first imaging plate and a second imaging plate for acquiring a first and a second medical image. A container is configured to receive and hold the first imaging plate and the second imaging plate in a predetermined overlapping orientation. An image reader receives the first and second medical images and produces first and second digital medical images. A processor creates a composite image of the first and second digital images. A method of acquiring a medical image includes identifying an overlapped region of a lower image and an upper image. An alignment transformation is identified by matching the overlapped regions of the upper and lower images. The upper and lower images are aligned based upon the alignment transformation. A composite medical image is created from the upper image and the lower image.

Systems, assemblies, computer readable media and methods for medical imaging

A method for reconstructing a medical image of an object in a reconstruction process, where image data is achieved by a medical imaging system by collecting a real measured projection image data of said object, in which method an antipriori component is deter-mined for modelling artifacts caused by the imaging system and/or reconstruction method. The antipriori component is used for attenuating said artifacts from the medical image of said object to be reconstructed in said reconstruction process.

Method and system for reconstructing a medical image of an object

The invention relates to a method, system and computer program product for reconstructing a model of an object of projection data advantageously gathered by X-ray imaging. It is characteristic for the invention, that after a point of at least one object of interest from at least two projection images is marked as a seed point, where said point locates inside the object of interest in the corresponding projection image, the model of the object of projection data is reconstructed by adding plurality of elementary object elements around the marked seed point in each direction until a criteria, such as likelihood criteria, is fulfilled in said direction, where priori information relating to the object of interest is connected with said elementary object element.

Method and system for reconstructing a model of an object

The invention relates to a method and system for determining a sharp panoramic image constructed from a group of projection images, especially the invention relates to defining a structure of the panoramic X-ray image of an area of a dentition and of jaws. The structure of a panoramic image to be generated from a group of projection images is determined by at least two crucial parameters, namely parameters of the central surface S of the sharp layer and thickness t(s) of the sharp layer, using penalty function F(S,t), which is at least a penalty function F(S,t) of low-frequency changes in the computed panoramic image corresponding to the choices S and t(S). After computing F(S,t) the best center surface and thickness function (in other words the sharpest layer of the panoramic image) is obtained by minimizing said penalty function F(S,t) over parameter space.

Method and system for determining a sharp panoramic image constructed from a group of projection images

A tomographic reconstruction method or device for calculation of a 3-dimensional image data or 2-dimensional slice from a limited amount of 2-dimensional or 1-dimensional projection images using iterations to calculate 3D image elements, comprising transformation of measured data to transform domain.

Method for limited angle tomography

This invention relates to a medical X-ray device arrangement for producing three-dimensional information of an object in a medical X-ray imaging, the medical X-ray device arrangement comprising an X-ray source for X-radiating the object from at least two different directions and a detector for detecting the X-radiation to form projection data of the object. The medical X-ray device () arrangement comprises means () for utilizing said projection data in a regularized reconstruction method based on solving the non-linear evolution equation&#x2202;&#x3c6;()=&#x2212;()*(((&#x3c6;()))&#x2212;)+&#x3b1;&#x3c6;()to produce three-dimensional information of the object, x representing the coordinates inside the object under imaging, t representing time, &#x3c6; representing a level set function indicating the boundary of the object, h representing a positive-valued function, m representing projection data, the operator A representing the X-radiation attenuation model, A* representing the backprojection operator of A, &#x3b1; representing a positive number, P representing high pass filtering, and f representing a cut-off function returning zero for non-positive arguments and positive values for positive arguments.

Method and arrangement for three-dimensional medical X-ray imaging

A medical X-ray device arrangement for producing three-dimensional information of an object in a medical X-ray imaging, the medical X-ray device arrangement comprising an X-ray source for X-radiating the object from at least two different directions and a detector for detecting the X-radiation to form projection data of the object. The medical X-ray device arrangement comprises means for modelling X-ray attenuation coefficient of said object using a multiresolution representation, eliminating part of the coefficients in said multiresolution representation to form reduced multiresolution representation, and utilizing said projection data in a regularized reconstruction method based on minimizing the penalty()=&#x2225;&#x2225;2/2+&#x3b1;&#x2225;()over the coefficients in the said reduced multiresolution representation to produce three-dimensional information of the object.

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Tuusula, Finland

Martti Kalke