Patent application number | Description | Published |
20080208022 | Laser Optical Feedback Tomography Sensor and Method - The invention relates to a modified Laser Optical Feedback Tomography sensor ( | 08-28-2008 |
20080230715 | Optical Imaging - An optical imaging apparatus ( | 09-25-2008 |
20080242960 | Spatially Resolved Oxymetry - In optical tomography, a calibration of the data may be necessary for image reconstruction. According to an exemplary embodiment of the present invention, the object of interest is used for calibration, wherein the image data is acquired during a highly oxygenated phase of the object of interest and wherein the calibration data is acquired during a low oxygenated phase of the object of interest. This may provide for an improved calibration, resulting in improved image quality. | 10-02-2008 |
20080267342 | Efficient Iterative Four-Dimensional Cardiac Cone-Beam Ct Reconstruction - The increasing cone angle of current high-end and future CT systems leads to a decrease in image quality if approximate cone-beam reconstruction methods are used. According to an exemplary embodiment of the present invention, an iterative four-dimensional cardiac CT reconstruction is provided, in which phase volumes are selected from the four-dimensional data set, each having the same spatial volume at different phase points. Corresponding voxels inside these phase volumes are then forward projected onto the same projection. After calculation of a different projection, these voxels are updated. This may provide for an efficient implementation of an iterative four-dimensional cardiac cone-beam CT reconstruction. | 10-30-2008 |
20080267480 | Iterative Image Reconstruction of a Moving Object From Projection Data - Iterative methods for reconstructing an image sequence of a moving object based on projection data usually require a high computationally effort. According to embodiments of the present invention there is provided such a method wherein a first image representing the object at a first phase is used as an initial image for iteratively reconstructing a second image at a second phase. A first gating function is assigned to the first phase, a second gating function is assigned to the second phase. When executing a first iteration for reconstructing the second image only projection data corresponding to a non-overlapping part of the two gating functions are used. For executing further iterations the amount of projection data corresponding to the overlapping part of the two gating functions may be gradually increased. Therefore, for all further but the last iteration the computationally effort is significantly reduced. However, this low computationally expense has no negative impact on the quality of the finally reconstructed second image because the method benefits from the fact that the first image was used as the initial image for iteratively reconstructing the second image. | 10-30-2008 |
20080269617 | Absorption and Scattering Map Reconstruction For Optical Fluorescence Tomography - Optical fluorescence tomography is a highly sensitive method to image contrast agents in the body. However, current reconstruction methods suffer from a high complexity or even instability. According to an exemplary embodiment of the present invention, a method for absorption/scattering map reconstruction for optical fluorescence tomography may be provided, which uses a spectral model. This may provide for a subsequent fluorescence reconstruction with improved image quality. | 10-30-2008 |
20080273655 | Imaging Method with Back Projection - The invention relates to an imaging method, especially a computerized tomography method, with which an object is penetrated by rays from different directions and measured values, which depend upon the intensity of the rays after penetrating the object, are acquired by a detector unit. From these measured values, an object image is reconstructed by means of back projection of measured-value-dependent back projection values. Therein, the object image is divided into overlapping, quasi-spherically symmetric image segments, each being defined by an image value and a quasi-spherically symmetric base function. Furthermore, during the back projection, the back projection values are added in proportions to the image values, wherein the proportion of a back projection value, which is added during the back projection to an image value, is dependent on a proportionality factor, which is equal to the average value of the line integrals of the base function belonging to the respective image value along those rays that have generated the measured value, on which the respective back projection value is dependent. | 11-06-2008 |
20090060121 | COMPUTED TOMOGRAPHY DATA ACQUISITION APPARATUS AND METHOD - A computed tomography scanner includes a first ( | 03-05-2009 |
20090069695 | DEVICE FOR IMAGING A TURBID MEDIUM - The present invention relates to a device for imaging a turbid medium ( | 03-12-2009 |
20090074133 | Reconstruction Method for Computer Tomograph and Computer Tomograph - It is an object of the invention to provide spiral computer tomography which has a high image quality. It relates to a reconstruction method for computer tomography of the heart, wherein the image is reconstructed from a data component of recordings of a partial detector path of a detector device and from a data component of recordings of a full detector path of the detector device, and to a computer tomograph having a beam source, a drive arrangement for driving the beam source in a spiral path around an object, a detector device for recording the radiation from the beam source which passes at least partially through the object, and a control device for reconstructing data components of a partial detector path and a full detector path. | 03-19-2009 |
20090153850 | OPTICAL FLUORESCENCE TOMOGRAPHY CALIBRATION - The invention relates to a device for imaging an interior of a turbid medium and a medical image acquisition device comprising: a) a measurement volume ( | 06-18-2009 |
20090202036 | IMAGE RECONSTRUCTION WITH VOXEL DEPENDENT INTERPOLATION - A radiographic imaging apparatus includes a radiation detector ( | 08-13-2009 |
20090240135 | METHOD OF DETERMINING A SPATIAL DISTRIBUTION OF MAGNETIC PARTICLES - The invention relates to a method of determining a spatial distribution of magnetic particles in an examination zone, in which a magnetic field is generated that has a first sub-zone of lower magnetic field strength and a second sub-zone of higher magnetic field strength. The positions of the two sub-zones are changed, as a result of which the magnetization in the examination zone changes. Measured values that depend on the change in magnetization are acquired. A reference response function by means of which measured values can be determined mathematically from a spatial distribution of magnetic particles is then determined by means of at least extensive magnetic specimen distribution. Finally, the spatial distribution of magnetic particles is reconstructed from the measured values by means of the reference response function. | 09-24-2009 |
20090259130 | OPTICAL TOMOGRAPHY MEASUREMENT USING AN ADAPTED BRIM FOR THE RECEIVING VOLUME - The invention relates to a device for imaging an interior of a turbid medium comprising: a) a receiving volume for receiving at least a part of the turbid medium, with the receiving volume being bound by a boundary having an opening bound by a brim, b) a light source for irradiating the turbid medium, and c) a photodetector unit for detecting light emanating from the volume as a result of irradiating the turbid medium. The device is adapted such that the brim is arranged for optically coupling the light source to the turbid medium and the turbid medium to the photodetector unit. One embodiment of the invention relates to a device for imaging an interior of a female breast comprising a cup-like receptacle ( | 10-15-2009 |
20090281416 | ARRANGEMENT AND METHOD FOR DETERMINING THE SPATIAL DISTRIBUTION OF MAGNETIC PARTICLES - The invention relates to an arrangement and a method for determining the spatial distribution of magnetic particles in an examination area. Magnetic field means are used to generate a spatially inhomogeneous gradient magnetic field with at least one region with a low field strength, in which the magnetization of the particles is in a state of non- saturation, whereas they are in a state of saturation in the remaining region. By using change means to shift the area with a low field strength within the examination area, a change in the magnetization of the magnetic particles is brought about which can be detected from outside by detection means and contains information about the spatial distribution of the magnetic particles in the examination area. The magnetic field means or the change means or the detection means or a combination of these means are arranged at least partially on a medical instrument. | 11-12-2009 |
20090326382 | OPTICAL IMAGING SYSTEM AND METHOD - A device for determining a concentration-related quantity of a fluorescent contrast agent applied to an object ( | 12-31-2009 |
20100014084 | IMAGING OF A TURBID MEDIUM - An imaging system for imaging of a turbid medium comprises a radiation source to illuminate an object to be imaged. A detection system detects radiation from the object and includes a separation module which distinguishes radiation components having respective wavelength ranges. An analysis module forms a comparison of respective radiation components. An image dataset is reconstructed on the basis of the comparison of respective radiation components. The comparison e.g. involves (i) the ratio of the levels of the high-wavelength radiation component to the low-wavelength radiation component, or (ii) i the relative difference of the levels of high-wavelength radiation component to the detected radiation, or (iiii) the relative difference of the levels of the high-wavelength radiation component to the low-wavelength radiation component. Good contrast in the reconstructed image is achieved when the comparison is relatively more beneficial to one of the wavelength ranges to the other ones over the relevant range of concentration of contrast agent. Accordingly, in the comparison competition among wavelength ranges is such that the intensity (or photon count) of that one wavelength range dominates so that any contrast in that one wavelength range does not suffer from contrast inversion. | 01-21-2010 |
20100030084 | DIFFUSE OPTICAL TOMOGRAPHY WITH MARKERS CONTAINING FLUORESCENT MATERIAL - The invention relates to a system, a medical image acquisition system, and a method for imaging an interior of a turbid medium ( | 02-04-2010 |
20100040267 | METHOD FOR OPTICALLY IMAGING AN INTERIOR OF A TURBID MEDIUM, METHOD FOR RECONSTRUCTING AN IMAGE OF AN INTERIOR OF A TURBID MEDIUM, DEVICE FOR IMAGING AN INTERIOR OF A TURBID MEDIUM, MEDICAL IMAGE ACQUISITION DEVICE AND COMPUTER PROGRAM - The invention relates to a method of imaging an interior of a turbid medium, a device for imaging an interior of a turbid medium, and a medical image acquisition device. A turbid medium is accommodated in a receiving volume ( | 02-18-2010 |
20100104149 | IMAGING OF A TURBID MEDIUM - An imaging system for imaging a turbid medium comprises a radiation source to illuminate an object to be imaged. A detection system to detect radiation from the object to produce a plurality of detected radiation levels at respective positions relative to the object. A distinction is made between (i) a central radiation component having passed mainly through an inner region of the object and (ii) a boundary radiation component having passed mainly through a boundary region of the object. On the basis of a comparison of the central radiation component and the boundary radiation component the optical properties, notably optical scattering and optical absorption are derived. From the detected radiation from the object and the optical properties an image of the interior or the object is reconstructed. | 04-29-2010 |
20100238441 | DEVICE FOR IMAGING THE INTERIOR OF AN OPTICALLY TURBID MEDIUM AND RECEPTACLE UNIT FOR SUCH A DEVICE | 09-23-2010 |
20100249606 | METHOD AND DEVICE FOR RECONSTRUCTING A FLUORESCENCE IMAGE OF THE INTERIOR OF A TURBID MEDIUM - A method for reconstructing a fluorescence image of the interior of a turbid medium is provided. Initial Green's functions for the light propagation in the turbid medium for irradiation light are calculated from the diffusion equation based on an initial assumption for the optical properties of the turbid medium. Optical properties are reconstructed as a function of the position in the interior of the turbid medium based on the results of an attenuation measurement. Updated Green's functions for the light propagation in the turbid medium for irradiation light are calculated from the diffusion equation based on the reconstructed optical properties of the turbid medium. Updated Green's functions for the light propagation in the turbid medium for fluorescence light are calculated from the diffusion equation based on the reconstructed optical properties of the turbid medium and based on an assumed contrast agent distribution. The spatial distribution of a fluorescent contrast agent is reconstructed based on the results of the fluorescence measurement. Updated Green's functions for the light propagation in the turbid medium for fluorescence light are calculated from the diffusion equation based on the reconstructed optical properties of the turbid medium and based on the reconstructed spatial distribution of the contrast agent. An updated spatial distribution of the fluorescent contrast agent is reconstructed based on the results of the fluorescence measurement. | 09-30-2010 |
20100272331 | METHOD FOR ASSESSING MEASUREMENT QUALITY AND DEVICE FOR IMAGING THE INTERIOR OF MEDIA - A method for assessing measurement quality in acquisition of an image of the interior of a medium ( | 10-28-2010 |
20110026851 | METHOD FOR RECONSTRUCTING A FLUORESCENT IMAGE OF THE INTERIOR OF A TURBID MEDIUM AND DEVICE FOR IMAGING THE INTERIOR OF A TURBID MEDIUM - A method for reconstructing a fluorescence image of the interior of a turbid medium is provided. The method comprises the step: accommodating a turbid medium ( | 02-03-2011 |
20120148136 | APPARATUS AND METHOD FOR PROCESSING PROJECTION DATA - The invention relates to a projection values processing apparatus ( | 06-14-2012 |
20120184841 | RETROSPECTIVE CALCULATION OF RADIATION DOSE AND IMPROVED THERAPY PLANNING - A combined magnetic resonance (MR) and radiation therapy system ( | 07-19-2012 |
20130265044 | MAGNETIC RESONANCE EXAMINATION SYSTEM WITH PREFERRED SETTINGS BASED ON DATA MINING - Provided herein is a system and method for performing a magnetic resonance imaging scan using a MR scanner. The method can comprise receiving via a user interface a MR imaging protocol categorizable into a MR scan type of a predefined set of MR scan types. Further, the method can comprise querying a database by providing to the database scan information permitting the database to identify the MR scan type of the MR imaging protocol. The method can further comprise receiving from the database statistical information on the MR scan type which can include statistics on modifications of individual scan parameters of the MR scan type, and providing the statistical information to the user interface. Modifications of the MR imaging protocol can be received from the user interface, resulting in a modified MR imaging protocol, according to which the MR imaging scan can be performed. | 10-10-2013 |
20140055135 | MOTION TRACKING BASED ON FAST IMAGE ACQUISITION - A magnetic resonance imaging (MRI) system including a memory for storing machine executable instructions and a processor for controlling the magnetic resonance imaging system. The MRI system for performing a plurality of MRI scans for acquiring magnetic resonance data from a target volume of a patient in accordance with respective predefined scan geometries. The execution of the machine executable instructions causes the processor to control the MRI system to at least: perform a first calibration scan; perform a second calibration scan; generate geometry transformation data; determine a deviation of the target volume caused by a movement of the patient; update each of the predefined scan geometries and the second scan geometry as a function of the geometry transformation data; and perform at least one MRI scan of the plurality of MRI scans to acquire image data in accordance with the respective updated predefined scan geometry. | 02-27-2014 |
20140348407 | METHOD OF IMAGE RECONSTRUCTION FOR A FILTERED BACK PROJECTION IN LIMITED ANGLE TOMOGRAPHY - The present invention is directed to a limited angle tomography in combination with a filtered back projection using a special filter operator X. The filter operator X used within the present invention makes it possible to perform region of interest reconstructions although delivering high quality reconstruction images as generated by high effort SART methods. The used filter operator is purely and solely mathematically determined and defined by the spatial geometry which is used for the limited angle tomography. Without having the need to perform several iterations, the present invention directly calculates a solution, i.e. reconstructed image, equivalent to known iteratively construction methods. Although, incomplete projection data p may only be used, the present invention provides for a high image quality. | 11-27-2014 |