Patent application number | Description | Published |
20100195889 | CT IMAGE RECORDING OF A MOVING EXAMINATION OBJECT - A method is disclosed for scanning a moving examination object using a CT-System, with which data is captured during a circular movement of a transmitter/receiver pair through 360 degrees about the examination object, the data being assigned to the respective angular position. The 360 degrees are divided into n subsegments of equal size, where n is greater than 2, an even number and not divisible by 4. In at least one embodiment, the data assigned to the odd number subsegments forms a first data record and the data assigned to the even number subsegments forms a second data record. Differential information is determined between the first data record and the second data record. Motion information relating to the movement of the examination object is determined using the differential information. | 08-05-2010 |
20100303326 | CT IMAGE RECONSTRUCTION OF A MOVING EXAMINATION OBJECT - A method is disclosed for reconstructing image data of a moving examination object from measured data, the measured data having been acquired during a rotating movement of a radiation source of a computed tomography system around the examination object. In at least one embodiment, first image data are determined from the measured data. Movement information is determined from the first image data by forming the difference between images. Time instants of little movement of the examination object are determined from the movement information, the determined time instants being dependent on the location or site within the examination object. Finally, second image data are reconstructed taking the determined time instants into account. These data can be output as result images. | 12-02-2010 |
20110075906 | SCANNING OF A CYCLICALLY MOVED EXAMINATION OBJECT USING A CONTRAST AGENT WITHIN THE SCOPE OF A PRELIMINARY EXAMINATION BY MEANS OF A CT SCANNER - A method is disclosed for scanning a cyclically moved examination object using a contrast agent within the scope of a preliminary examination by way of a CT scanner, in which measurement data is recorded at a sequence of recording times, and in which a first image is reconstructed at every recording time from the measurement data, from which a time profile of a concentration of the contrast agent is established. In at least one embodiment, the recording times for respectively recording a certain phase of the motion are synchronized with a motion signal from the examination object, wherein a second image with a small time offset with respect to the first image is reconstructed from the measurement data at each recording time, and wherein a motion curve representing a time profile of an intensity of the cyclical motion is established by comparing the first image and the second image at each recording time. As such, motion information can also be obtained from the mandatory preliminary examination with a minimally increased dose. A corresponding CT scanner and a computer program are also disclosed. | 03-31-2011 |
20110103542 | BEAM HARDENING CORRECTION FOR CT PERFUSION MEASUREMENTS - A method is disclosed for reconstructing image data of an examination subject from measured data, wherein a series of measured data sets has previously been acquired during a relative rotational movement between a radiation source of a computed tomography system and the examination subject and the measured data sets relate to the same section of the examination subject at succeeding instants in time. In at least one embodiment, first image data is reconstructed in each case from the measured data sets such that a series of first image data is available. A change variable indicating a change over time within the series of first image data is determined, and a distinction is made between different components of the examination subject in the first image data with the aid of the change variable. This distinction is used for beam hardening correction in an iterative algorithm for calculating enhanced image data. | 05-05-2011 |
20110129056 | COMPUTERIZED METHOD AND PROCESSOR FOR SELECTING ACQUISITION CONFIGURATIONS TO OBTAIN X-RAY COMPUTED TOMOGRAPHY DATA - In a method to assist in the selection of an acquisition configuration from a set of adjustable acquisition configurations for the acquisition of x-ray projections of the heart of a patient with a computed tomography apparatus to examine the heart of the patient, the which method is based on an examination type to be specified. At least two acquisition configurations for the specified examination type (which acquisition configurations can be adjusted at the computed tomography apparatus) are considered for which at least one probability density function is respectively kept ready that was determined for the respective acquisition configuration for a specific variable pertaining to a person and/or for the x-ray dose to be applied to the person. Using the at least two probability density functions, the acquisition configuration that is best suited for the examination of the heart of the patient according to the specified examination type is determined from the at least two adjustable acquisition configurations under consideration, based on at least one determined variable to be specified and pertaining to the current patient to be examined and/or based on a value pertaining to the applied x-ray dose. The invention also concerns a computed tomography apparatus operable according to such a method and a storage medium encoded with programming instructions for implementing such a method. | 06-02-2011 |
20110243419 | Multisegment Picture Reconstruction For Cardio CT Pictures - A method for reconstructing picture data of a cyclically-moving object from measurement data is disclosed, with the measurement data being detected beforehand for a relative rotational movement between a radiation source of a computed tomography system and the object under examination during a plurality of movement cycles of the object under examination. In at least one embodiment, a first picture and a second picture are determined from the measurement data, with measurement data of different movement cycles being combined for reconstruction of the second picture into a measurement dataset to be used as the basis for the picture reconstruction. Difference information is computed by comparing the first picture with the second picture. Using the difference information, a result picture is computed from the first picture and the second picture. | 10-06-2011 |
20110317901 | Temporal Resolution In Cardio CT - A method is disclosed for the reconstruction of picture data of a moving object under examination from measurement, with the measurement data having been recorded beforehand for a relative rotational movement between a radiation source of a computed tomography system and the object under examination. In at least one embodiment, first picture data is computed from a complete measurement dataset of the measurement data for a picture reconstruction, and second picture data is computed from an incomplete measurement dataset for a computed tomography picture reconstruction. The first picture data and the second picture data are combined into third picture data, with the combination being computed using location-dependent movement information of the object under examination. | 12-29-2011 |
20120082291 | Method And CTDevice For Computer Tomographic Spiral Scanning Of A Patient - An embodiment of the invention relates to a method and to a CT device for computer tomographic spiral scanning of a patient in the region of a moving organ, in particular a beating heart, wherein a pitch is adjusted which is less than the maximum pitch, with which 180° image data can still be reconstructed. In at least one embodiment, during the scan the evaluated detector data with respect to its z width and position on the at least one irradiated detector are restricted as a function of the projection angle in such a way that an effective virtual detector with smaller z width and with a z speed profile, which differs from the z speed profile of the real detector, is produced respectively, and the moving organ is reconstructed on the basis of the detector data of the at least one virtual detector. | 04-05-2012 |
20120101376 | Apparatus For Specifying The Quantity Of A Contrast Medium In The Context Of Medical Imaging - The apparatus of at least one embodiment includes an input unit, a storage unit, an output unit, and an interface to the imaging device, via which configuration parameters of the imaging device can be read out or transferred. A calculating unit either reads out the configuration parameters from the imaging device or sends the configuration parameters to the imaging device if they have been entered at the input unit by an operator, the configuration parameters being required for the purpose of specifying the quantity of a contrast medium. The calculating unit is so designed as to calculate, on the basis of the parameters that have been entered and/or read out and calculation formulas which are stored in the storage unit, the quantity of a contrast medium that is required for these parameters, and to display the quantity via the output unit. | 04-26-2012 |
20140247917 | X-RAY CT SCANNING AND DUAL-SOURCE CT SYSTEM - A method is disclosed for x-ray CT scanning with a dual-source system, in which two radiation bundles are each delimited by diaphragms such that these radiation bundles are free of mutual points of intersection at least in the examination object. An embodiment of the invention also relates to a dual source CT system, including a controller configured to control radiation-delimiting diaphragms, which delimit and align the radiation bundles such that these run free of mutual points of intersection at least in the examination object. | 09-04-2014 |
20150043708 | METHOD FOR RECORDING PROJECTIONS DURING A SPIRAL SCAN, METHOD FOR IMAGING AND MULTI-SLICE COMPUTED TOMOGRAPHY DEVICE - In an embodiment, a method includes at least moving a patient table through a measurement region of the computed tomography device, the movement of the patient having at least one phase of variable speed during the projection recording, time-solved determination or recording of the patient table position, time-resolved recording of projections of at least one part of an examination object moving with the table, the number of the slices contributing to the recording being varied during the at least one phase of variable speed of the patient table as a function of the table speed in such a way that the quotient formed from the current table speed divided by the number of the slices contributing to the recording is constant so that the pitch factor is kept constant during the projection recording, and time-resolved determination or recording of the number or slices contributing to the projection recording. | 02-12-2015 |
20150063534 | IMAGE-BASED MOTION COMPENSATION OF IMAGE DATA - A method, a computer program, a computer program product and a computed tomography system are disclosed. The image data is a spatially three-dimensional reconstruction. At least one value for an image metric of the image data is determined. A motion field for motion compensation of the image data is then determined on the basis of image data as a function of the image metric. Essentially, partial image data is determined, wherein the partial image data corresponds in each case to the spatially three-dimensional reconstruction from scan data of an angular sub-range. The motion field of the image data is determined at the control points via an optimization method as a function of the image metric, so that, thereafter, the partial image data is transformed in accordance with the motion of the motion field. New image data is then produced by merging the partial image data. | 03-05-2015 |