Abstract: An X-ray imaging apparatus comprising a rotary arm and an image assembly mounted on the rotary arm is provided. The image assembly comprises an X-ray detector and an X-ray source configured to emit X-rays incidental to the X-ray detector, wherein the X-ray source is coupled to the rotary arm by a movable support configured to modify the position of the X-ray source to set the distance between the X-ray source and an object to be imaged, and wherein movement of the X-ray source is dynamically controlled during tri-dimensional imaging.

Abstract: A method of calibrating a mechanical model of behavior and movement of an interventional radiology table by moving the table over at least one degree of freedom, acquiring at least one set of images corresponding to different positions of the table and C-arm, obtaining at least one set of images of a test object from different positions, using the images of the test object to determine parameters of the mechanical model of table behavior and movement, and combining these parameters with data given by table movement sensors so as to deduce the true relative positions of the table with respect to the medical imaging system.

Abstract: A treatment process of radiological images is provided. The process comprises obtaining at least one set of images. For each set, the process comprises: segmenting an at least one first image to obtain an at least one first segmented image and to detect a plurality of arteries of the region of interest and an at least one second image to obtain an at least one second segmented image and to detect and isolate the tool; defining in the at least one first segmented image a plurality of lines, wherein each line defines an artery; determining, from the second segmented image and the defined lines, an artery of interest corresponding to the artery in which a tool has been inserted; and applying a quantitative analysis algorithm of coronary lesions to the artery of interest to detect lesion of the artery of interest.

Abstract: A system and method for correcting the registration of a 3D image and a 2D image acquired with medical imaging systems is disclosed. The system and method determines acquisition geometry of the imaging system by calculating an initial projection matrix associated with the 2D image. The system performs a projection of the 3D image using the initial projection matrix resulting in a 2D projection of the 3D image. The system registers the 2D projection of the 3D image and the 2D image. A new projection matrix is determined based on the registration of the 2D image and the 2D projection of the 3D image. The 3D image is then registered with the 2D image using the new projection matrix. An associated medical imaging system is disclosed. Method embodiments use previously acquired 3D images or images acquired using imaging modalities different than the one used to acquire the 2D image.

Abstract: The disclosure generally relates to dual-energy imaging, and in particular, techniques to produce and process dual-energy images using a dual-energy imaging system. One embodiment provides a method for generating at least one image of a region of interest in a patient, the method comprising: obtaining at least two radiological images of the region of interest identified with at least one marker arranged on and/or around the patient, wherein a first image is acquired. with a first X-ray energy and a second image is acquired with a second X-ray energy; and determining a final radiological image of the region of interest by linearly combining the two radiological images to obtain an image without the markers.

Abstract: The embodiments of the invention pertain to a method, a computer program, and an imaging system used to monitor the dose of radiation accumulated in a body or a part of a body being or having been subject to radiation exposure during an acquisition of at least one radiological image, comprising: processing the at least one radiological image to determine a 3D model of the body or of the part of a body; applying a theoretical model for the interactions between matter and radiation to the 3D model; storing in memory the parameters characteristic of the emission of radiation produced during the acquisition of the at least one radiological image; and calculating a distribution of an accumulated radiation dose in the body or the part of a body which has been the subject of the acquisition of the at least one radiological image.

Abstract: A method to process images for interventional imaging, wherein a 3D image of an object is visualized with a medical imaging system, the medical imaging system comprising an X-ray source and a detector, is provided. The method comprises acquiring a plurality of 2D-projected images of the object along a plurality of orientations of the imaging chain, wherein a rectilinear instrument has been inserted into the object. The method also comprises determining a 3D reconstruction of the instrument such that a plurality of 2D projections of the 3D image of the instrument, along the respective orientations in the 2D-projected images of the object were acquired, are closest to the acquired 2D-projected images of the object. The method further comprises superimposing the 3D reconstruction of the instrument over the 3D image of the object so as to obtain a 3D image comprising the object and the instrument.

Abstract: A method for determining an orientation in space of a substantially cylindrical shaped elementary object using a radiography device comprising a source of X-rays and a detector disposed opposite the source is provided. The radiography device is arranged to record a projection image of the elementary object when the elementary object is located between the source and the detector. The method includes: determining a quantity A of X-rays absorbed by the elementary object on the projection image; and evaluating the sine of an angle ? as a function of the quantity A of absorbed X-rays, wherein the angle ? is between a longitudinal axis of the elementary object and a plane of the projection image.

Abstract: A system to track movement of an object travelling through an imaged subject is provided. The system includes an imaging system to acquire a fluoroscopic image and operable to create a three-dimensional model of a region of interest of the imaged subject. A controller includes computer-readable program instructions representative of the steps of calculating a probability that an acquired image data is of the object on a per pixel basis in the fluoroscopic image, calculating a value of a blending coefficient per pixel of the fluoroscopic image dependent on the probability, adjusting the fluoroscopic image including multiplying the value of the blending coefficient with one of a greyscale value, a contrast value, and an intensity value for each pixel of the fluoroscopic image. The adjusted fluoroscopic image is combined with the three-dimensional model to create an output image illustrative of the object in spatial relation to the three-dimensional model.

Abstract: A method of calibrating a mechanical model of behaviour and movement of an interventional radiology table by moving the table over at least one degree of freedom, acquiring at least one set of images corresponding to different positions of the table and C-arm, obtaining at least one set of images of a test object from different positions, using the images of the test object to determine parameters of the mechanical model of table behaviour and movement, and combining these parameters with data given by table movement sensors so as to deduce the true relative positions of the table with respect to the medical imaging system.

Abstract: An image processing method for interventional imaging in which a region of interest of a patient is viewed. The method comprises acquiring a succession of images of a region of interest of the patient. The method also comprises detecting and tracking, on the successive images, at least one surgical instrument introduced inside the region of interest of the patient, in order to isolate said instrument therein; and comparing two successive images on which the surgical instrument has been isolated in order to identify at least one common shape therein. The method further comprises estimating the displacement of said common shape between both of these successive images; and re-alignment processing of the different successive images depending on the thereby determined estimations of displacements, these displacement estimations being considered as corresponding to the displacement caused by the physiological movement of the patient with the exception of any other movement.

Abstract: A method and device for real time navigation of a surgical tool handled by an operator in a region of interest of a body itself subject to at least one physiological movement.

Abstract: A method for determining acquisition geometry of an imaging system from a set of calibration matrices for an arbitrary position of the system, a projection matrix makes a point in a 2D image correspond to a point of an object in a space. This matrix is produced for any unspecified position of the system from knowledge of a limited number of pre-computed calibration matrices. For instance, a projection matrix may be computed by interpolating coefficients of calibration matrices and/or applying a transformation with a rigid model defined comprehensively or locally to a particular calibration matrix.

Abstract: A method for the correction of registration of radiography images comprises means to determine a residual rigid transformation in comparing the pre-operation 3D image with a fluoroscopic image. This residual transformation is determined according to a registration based on the content of the image. Once the residual transformation is computed, it is combined with a geometrical registration. The use of the geometrical registration in this combination enables the making of a real-time registration comprising the motion of the C-arm without any additional registration. And the use of the registration based on the content of the image enables the precision of said geometrical registration to be refined.

Abstract: A system to generate an image dependent on tracking movement of an object travelling through an imaged subject is provided. The system comprises a tracking system operable to detect a position or an orientation of the object travelling through the imaged subject, and an imaging system operable to create a three-dimensional model of a selected anatomical structure of the imaged subject. A controller is operable to store a plurality of computer-readable program instructions for execution by a processor, the plurality of program instructions representative of the steps of: calculating at least one two-dimensional view of a volume of interest extracted from the three-dimensional model, the volume of interest dependent relative to the tracked position of the object, and generating an output image illustrative of the at least one two-dimensional view of the volume of interest.

Abstract: A system to track movement of an object travelling through an imaged subject is provided. The system includes an imaging system to acquire a fluoroscopic image and operable to create a three-dimensional model of a region of interest of the imaged subject. A controller includes computer-readable program instructions representative of the steps of calculating a probability that an acquired image data is of the object on a per pixel basis in the fluoroscopic image, calculating a value of a blending coefficient per pixel of the fluoroscopic image dependent on the probability, adjusting the fluoroscopic image including multiplying the value of the blending coefficient with one of a greyscale value, a contrast value, and an intensity value for each pixel of the fluoroscopic image. The adjusted fluoroscopic image is combined with the three-dimensional model to create an output image illustrative of the object in spatial relation to the three-dimensional model.

Abstract: A method and apparatus for determining the three-dimensional movement of a patient positioned on a table between an X-ray source and an image receiver of an X-ray imaging apparatus. The apparatus has an X-ray source positioned opposite an image receiver, the X-ray source and the image receiver being driven in rotation about an axis. The method and apparatus has the following operation: at least three radio-opaque markers are placed on the patient's body; at least one first radiographic image of the patient is taken for a first determined fixed position of the imaging apparatus; at least one second radiographic image of the patient is taken for a second determined fixed position of the imaging apparatus; and a matrix of the three-dimensional movement of the patient with respect to the X-ray source of the imaging apparatus is determined on the basis of the two-dimensional movements of the markers in the radiographic images, the X-ray source constituting a fixed reference frame.

Abstract: A method and apparatus for determining acquisition geometry of an imaging system from a set of calibration matrices for an arbitrary position of the system, a projection matrix makes a point in a 2D image correspond to a point of an object in a space. This matrix is produced for any unspecified position of the system from knowledge of a limited number of pre-computed calibration matrices. For instance, a projection matrix may be computed by interpolating coefficients of calibration matrices and/or applying a transformation with a rigid model defined comprehensively or locally to a particular calibration matrix.