摘要:
A method and system for acquiring information on lesions in dynamic 3D medical images of a body region and/or organ, having the steps: applying a registration technique to align a plurality of volumetric image data of the body region and/or organ, yielding multi-phase registered volumetric image data of the body region and/or organ; applying a hierarchical segmentation on the multi-phase registered volumetric image data of the body region and/or organ, the segmentation yielding a plurality of clusters of n-dimensional voxel vectors of the multi-phase aligned volumetric image; determining from the plurality of clusters a cluster or set of clusters delineating the body and/or organ; identifying the connected region(s) of voxel vectors belonging to the body region and/or organ; refining/filling the connected region(s) corresponding to the body region and/or organ; reapplying the segmentation step to the refined/filled connected region(s) corresponding to the body region and/or organ, to obtain a more accurate segmentation; and acquiring information on the presence of lesions in cluster of set of clusters of said plurality of clusters.
摘要:
A gray value model is generated encoding photometric knowledge at landmark positions. This step exploits intensity correlation in neighborhoods sampled around landmark positions. A geometric model is generated encoding geometric knowledge between landmarks. This step exploits spatial correlation between landmarks of segmented anatomic entities.
摘要:
In a method for radiographic scoring of a radiographic image at least one region of interest is determined. Each of the determined regions of interest is displayed in close proximity to a number of reference stages each having an associated score. For each region of interest a reference stage image best matching the displayed region of interest is selected and the score number associated with the selected reference stage image is associated with the region of interest. Score numbers retained for each of the regions of interest are combined to form the score number of the radiographic image.
摘要:
A first and a second image are expressed in a common coordinate system by applying a geometric transformation to the second image so as to map a structure in the second image onto a corresponding structure in the first image in a common coordinate system. Starting from initial values, the parameters of the geometric transformation are updated taking into account the result of an evaluation of a cost function. Measurements are performed in the common coordinate system.
摘要:
An assembly for recording a radiation image of an elongate body comprises a plurality of cassettes each conveying a recording member and each having a length that is smaller than the length of the elongate body. Supporting devices are arranged for holding the plurality of cassettes in a staggered arrangement so that the length of the staggered arrangement is at least equal to the length of the elongate body. This assembly is exposed to the radiation image of an elongate body. By use of partial images which are read from each of the recording members, the entire image of the elongate body is reconstructed.
摘要:
Method of determining (a) symmetry line(s) in a radiation image. A method of determining (a) symmetry line(s) in horizontal (vertical) direction in an image that is represented by a matrix of digital pixel values by (i) calculating a symmetry point for each column (row) of the image, and (ii) interconnecting calculated symmetry points.
摘要:
A noise reducing method and associated apparatus for use in a medical radiographic imaging system wherein an image represented by an array of pixels is processed and the processed image is recorded on a recording medium or visualized on a display monitor. The processing comprises the steps ofa) decomposing an original image into a sequence of detail images or into an array of coefficients representing detail strength at multiple resolution levels and a residual image,b) pixelwise attenuating the detail images or the coefficient arrays according to the locally estimated amount of relevant signal present and in accordance with an estimated noise level,c) reconstructing a processed image by accumulating detail obtained from the attenuated detail images or from the attenuated detail coefficients, and further adding the residual image.
摘要:
A method of detecting the orientation of a radiographic image represented by a digital signal representation wherein mathematical moments of the digital signal representation are calculated relative to different reference entities and wherein a decision on the orientation of the radiographic image, for example the position of the thorax edge in a mammographic image, is obtained on the basis of an extreme value (minimum, maximum) of the calculated moments.
摘要:
A method of detecting the orientation of a radiographic image represented by a digital signal representation wherein mathematical moments of the digital signal representation are calculated relative to different reference entities and wherein a decision on the orientation of the radiographic image, for example the position of the thorax edge in a mammographic image, is obtained on the basis of an extreme value (minimum, maximum) of the calculated moments.
摘要:
A Markov Random Field (MRF)-based technique is described for performing clustering of images characterized by poor or limited data. The proposed method is a statistical classification model that labels the image pixels based on the description of their statistical and contextual information. Apart from evaluating the pixel statistics that originate from the definition of the K-means clustering scheme, the model expands the analysis by the description of the spatial dependence between pixels and their labels (context), hence leading to the reduction of the inhomogeneity of the segmentation output with respect to the result of pure K-means clustering.