Abstract: A method for canceling the impact of the physical property variability on the image quality performance of a digital imaging system, obtained during quality control (QC) analysis using a serial numbered quality control (QC) target by applying physical property deviation controlled behavior model corrections to the raw image quality performance. The serial numbered QC-target used for the QC analysis comprises target-specific, measured physical property data encoded in- or outside of QC-target.

Abstract: A computer implemented method for defining a breast window within an image for a breast, said image containing a breast image having a breast boundary, the method comprising: identifying a center region of the breast image, where the center region is coincident with an edge of the image; defining the edge of the image as the first border of the breast window; searching from the center region along the edge of the image for the breast boundary, the breast boundary informing a second border of the breast window; searching from the center region along the edge of the image in an opposite direction for the breast boundary, the breast boundary informing a third border of the breast window; and repeatedly searching from the center region in a direction orthogonal to the edge of the image for a point on the breast boundary most distant from the edge of the image, the point on the breast boundary informing a fourth border of the breast window.

Abstract: The invention relates to a system and a corresponding method for optical coherence tomography having at least one interferometer for emitting light with which a specimen is irradiated, a specimen arm comprising a specimen objective by means of which light emitted by the interferometer is focussed in a focus lying within the specimen, a detector for collecting light which is reflected by the specimen, and a control unit for controlling the system such that during the collection alight, which is respectively reflected at different depths of the specimen, the imaging properties of the specimen objective are changed.

Abstract: A method and to a corresponding apparatus reads out X-ray information stored in a storage phosphor plate (1), the storage phosphor plate (1) being irradiated with stimulation light (3) and so being stimulated into emitting emission light which is collected by a detector (9) during several measuring times and being converted into corresponding emission light signals (S, R). In order to guarantee high reliability when examining sensitivity fluctuations, in particular with different types of detectors, provision is made such that reference measurements are taken by the detector (9) during several reference measuring times and several reference signals are thus produced, the individual reference measuring times falling respectively between the measuring times, and the reference signals being used for examining the sensitivity of the detector (9) to emission light.

Abstract: The invention relates to a system and to a corresponding method for optical coherence tomography having an interferometer (10) for emitting light with which a specimen (1) is irradiated, the interferometer (10) comprising a beam splitter (13) and at least one reflector (12) the optical distance (I) of which from the beam splitter (13) can be changed by an optical path (L), and a detector (30) with a first number of detector elements arranged in a first area for collecting light which is reflected by the specimen (1). In order to be able to record images of a specimen, in particular in real time, more simply and quickly, the system is operated in a first mode in which light reflected by the specimen (1) is only collected by a second number of detector elements of the detector (30) and converted into corresponding detector signals, the second number of detector elements being smaller than the first number of detector elements.

Abstract: In a method and a system for optical coherence tomography, light, with which a specimen (1) is irradiated, is emitted by an interferometer (10), which comprises a beam splitter (13) and a reflector (12). Light reflected by the specimen (1) is collected by a detector (11), and the reflector (12) is brought into a number of positions at different optical distances away from the beam splitter (13). To record images of a specimen (1) easily and quickly, with high quality, the light reflected by the specimen (1) is collected a number of times by the detector (11) and converted into corresponding detector images, while the reflector (12) in the respective position is in the rest position. An averaged detector image is obtained for each position. A tomogram is generated from the averaged detector images obtained for the different positions of the reflector (12).

Abstract: The invention relates to a system and to a corresponding method for optical coherence tomography having an interferometer (10) for emitting light with which a specimen (1) is irradiated, the interferometer (1) comprising a beam splitter (13) and at least one reflector (12) the optical distance (I) of which from the beam splitter (13) is changeable, a specimen objective by means of which light emitted by the interferometer (10) is focussed in a focus lying within the specimen (1), and a detector (30) for collecting light which is reflected by the specimen (1).

Abstract: A method of generating a multiscale contrast enhanced image is described wherein the shape of edge transitions is preserved. Detail images are subjected to a conversion, the conversion function of at least one scale being adjusted for each detail pixel value according to the ratio between the combination of the enhanced center differences and the combination of the unenhanced center differences. Several adaptive enhancement measures are described.

Abstract: A method of server site rendering 3D images on a server computer coupled to a client computer wherein the client computer instructs a server computer to load data for 3D rendering and sends a stream of rendering parameter sets to the server computer, each set of rendering parameters corresponding with an image to be rendered; next the render computer renders a stream of images corresponding to the stream of parameter sets and the stream of images is compressed with a video compression scheme and sent from the server computer to the client computer where the client computer decompresses the received compressed video stream and displays the result in a viewing port. The rendering and communication chain is subdivided in successive pipeline stages that work in parallel on successive rendered image information.

Abstract: A basic component of Computer-Aided Detection systems for digital mammography comprises generating candidate mass locations suitable for further analysis. A component is described that relies on filtering either the background image or the complementary foreground mammographic detail by a purely signal processing method on the one hand or a processing method based on a physical model on the other hand. The different steps of the signal processing approach consist of band-pass filtering the image by one or more band pass filters, multidimensional clustering, iso-contouring of the distance to centroid of the one or more filtered values, and finally candidate generation and segmentation by contour processing. The physics-based approach also filters the image to retrieve a fat-corrected image to model the background of the breast, and the resulting image is subjected to a blob detection filter to model the intensity bumps on the foreground component of the breast that are associated with mass candidates.

Abstract: At least one of two enhancement methods for changing contrast and/or density are applied to an image. According to a first enhancement method the window width/level settings of the image are modified and according to a second enhancement method density and contrast of the image are modified by modifying a multi-scale representation of the image whereby modification is derived from at least two gradient functions determined at different scales, a gradient function at a specific scale specifying the dependency of contrast amplification at said scale as a function of density. The amount of modification obtained by applying either of said first and second enhancement methods is determined by the amount of movement of at least one indicium.

Abstract: A method and a corresponding apparatus for determining a position in an image, in particular a medical image enables a reliable determination of positions of interest in images of a variety of structures by displaying a volume rendering of image data acquired from an object, in particular a patient, pointing at a structure of interest displayed in the volume rendering of the image data, generating a viewing ray profile comprising information characterizing a ray running through said structure of interest, selecting a contextual profile from various contextual profiles, each of said contextual profiles comprising a representative ray profile representing a viewing ray profile of a structure, in particular an anatomical structure, and comprising profile information, and determining a position within said structure of interest based on said profile information of said selected contextual profile in the case that the representative ray profile of said selected contextual profile is matching with at least a part o

Abstract: Method of eliminating the effect of afterglow on a radiation image read out of a photostimulable phosphor screen. For each pixel the amount of afterglow generated by previously scanned pixels in the same line of pixels is determined and subtracted from the digital signal representation of that pixel.

Abstract: At least one approximation image is created of the image at one or multiple scales. Translation difference images are created by pixel-wise subtracting the values of an approximation image at scale s and the values of a translated version of the approximation image. A non-linear modification is applied to the values of the translation difference image (s) and at least one enhanced center difference image at a specific scale is computed by combining the modified translation difference images at that scale or a smaller scale with weights Wi,j. An enhanced image is computed by applying a reconstruction algorithm to the enhanced center difference images. The non-linear modification of the values of the translation difference images is steered by the values of an orientation map which comprises for each pixel a local direction of interest.

Abstract: A region of interest in the image is determined and for each pixel in each location (x,y) in that region of interest a value hint(x,y) is computed representing the amount of dense tissue below said pixel as h int ? ( x , y ) = 2 ? fat ? ( E ) - ? int ? ( E ) ? ( Log ? ( p ? ( x , y ) ) - Log ? ( p fat ) ) wherein p(x,y) represents the pixel value of a pixel at location (x,y) in said digital mammographic image, pfat is a reference fat pixel value, ?fat,?int are the linear attenuation coefficients of fat tissue and dense tissue and E is the mono-energetic energy value of the x-ray source at image recording, whereby E and pfat are derived from said digital mammographic image representation.

Abstract: A digital image signal is decomposed into a multi-scale representation comprising detail images and approximation images. Translation difference images are computed by subtracting an approximation image at scale s and a translated version of that approximation image. The values of the translation difference images are non-linearly modified. An amplification image is computed at least one scale as the ratio of a first image being computed by combining the modified translation difference images at the same or smaller scale and a second image created by combining unenhanced translation difference images at the same or smaller scale. Next, an enhanced multi-scale detail representation is computed by modifying at least one scale the detail image according to the amplification image at that scale. An enhanced image representation is computed by applying a reconstruction algorithm to the enhanced multi-scale detail representation.

Abstract: The invention relates to an apparatus (10) and a corresponding process for identifying an object (20) with an article dependently upon a piece of barcode information detected from a barcode (30) with which the object (20) is identified. Here a number of article numbers are stored in a memory (60) which are assigned, on the one hand, to a number of articles and on the other hand to a number of different article number types. According to the invention, the piece of barcode information detected is compared with article numbers stored in the memory (60) dependently upon a specified sequence of article number types. In the case of the piece of barcode information detected corresponding with one of the stored article numbers, the object (20) is identified with the article assigned to this article number.

Abstract: The invention relates to a system and to a corresponding method for optical coherence tomography having a light source (15) for producing light (14), a first interferometer (10), a second interferometer (20) and an optical fiber (17) by means of which light emitted by the first interferometer (10) is conveyed to the second interferometer (20). For simpler and more efficient injection of the light emitted by the first interferometer (10) into the optical fiber (17) provision is made such that light is injected into the first interferometer (10) which has a first number of transversal modes, and the optical fiber (17) has at least one multi-mode fiber into which the light passing out of the first interferometer (10) is injected such that in the optical fiber (17) a second number of transversal modes is stimulated which is conveyed to the second interferometer (20), the second number of transversal modes being substantially greater than the first number of transversal modes.

Abstract: The invention relates to a system and to a corresponding method for optical coherence tomography having an interferometer (10) and a detector system (30, 31) which comprises a detector (30) for collecting the light reflected by a specimen (1) to be examined and has a sensitivity to the light reflected by the specimen (1). In order to reduce the times required for the most reliable possible recording of interference signals provision is made such that the sensitivity of the detector system (30, 31) to the light reflected by the specimen (1) and impinging on the detector (30) is modulated with a modulation frequency.

Abstract: The invention relates to a system for generating evaluation data with a data base for storing original data, a memory for storing an evaluation program for the evaluation of original data stored in the data base and a control. In order to achieve rapid and reliable provision of evaluation data, an evaluation order for evaluating original data is generated upon the occurrence of a pre-specified event. It is checked by the control whether an evaluation order has been generated. In the event of an evaluation order being present, the evaluation program stored in the memory is started dependently upon the evaluation order, the evaluation program accessing original data stored in the data base dependently upon the evaluation order and the evaluation data being generated from this.