Patent application number | Description | Published |
20110064292 | SYSTEM AND METHOD FOR MULTI-IMAGE BASED VIRTUAL NON-CONTRAST IMAGE ENHANCEMENT FOR DUAL SOURCE CT - A method for enhancing a virtual non-contrast image, includes receiving a pair of dual scan CT images and calculating a virtual non-contrast image from the pair of CT images using known tissue attenuation coefficients. A conditional probability distribution is estimated for tissue at first and second points in each of the pair of CT images and the virtual non-contrast image as being the same type. A conditional probability distribution for tissue is estimated at the first and second points in each of the pair of CT images and the virtual non-contrast image as being of different types. An a posteriori probability of the tissue at the first and second points as being the same type is calculated from the conditional probability distributions, and an enhanced virtual non-contrast image is calculated using the a posteriori probability of the tissue at the first and second points as being the same type. | 03-17-2011 |
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 |
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 |
20120010479 | METHOD, COMPUTER READABLE MEDIUM AND DEVICE FOR DETERMINING THE TEMPERATURE DISTRIBUTION IN A TISSUE - Example embodiments of the present invention relate to a method for determining the temperature distribution in a tissue to be ablated and/or in a body tissue of a patient containing the tissue to be ablated. The method includes determining at least one item of information relating to a blood flow associated with at least one of in the tissue to be ablated and in the body tissue containing the tissue to be ablated, such that the item of information originates from a perfusion measurement of at least one of the tissue to be ablated and the body tissue containing the tissue to be ablated. The method includes determining the temperature distribution in the tissue to be ablated and/or in the body tissue containing the tissue to be ablated taking into account the at least one item of information relating to the blood flow. | 01-12-2012 |
20120093382 | METHOD FOR GENERATING A TOMOGRAPHIC TEMPERATURE MAP IN A PATIENT BY WAY OF A CT DEVICE, CONTROL AND COMPUTING UNIT AND CT SYSTEM - A method for generating a tomographic temperature map in a patient by use of a CT device, a computing unit and CT system with computing unit are disclosed. In at least one embodiment of the method, the local distribution of density and mean atomic number is determined on the basis of tomographic image data from different X-ray energy regions, and a local temperature distribution in the tissue of the patient is ascertained from previously experimentally determined or theoretically calculated relations between Z values, density and temperature. | 04-19-2012 |
20120236995 | Automated Imaging Contrast Agent Determination System - A system automatically adaptively determines contrast agent administration parameters for use in a CT scan imaging system. The system includes a repository, input processor, imaging processor and output processor. The repository includes predetermined information associating, a contrast agent type, contrast agent administration parameters, an imaging system X-ray tube voltage and at least one of, (a) a type of imaging procedure and (b) an anatomical region to be imaged. The input processor receives data identifying a type of imaging procedure or an anatomical region to be imaged. The imaging processor uses the information in automatically identifying contrast agent parameters and X-ray tube voltage in response to the received data. The output processor provides output data to a destination device indicating contrast agent parameters for use in administering contrast agent to a patient. | 09-20-2012 |
20120250967 | METHOD, IMAGE PROCESSING DEVICE AND COMPUTED TOMOGRAPHY SYSTEM FOR DETERMINING A PROPORTION OF NECROTIC TISSUE AS WELL AS COMPUTER PROGRAM PRODUCT WITH PROGRAM SECTIONS FOR DETERMINING A PROPORTION OF NECROTIC TISSUE - An image processing device and method are disclosed for determining a proportion of necrotic tissue in a defined tissue area of an object under examination based on a high-energy image dataset and a low-energy image dataset, each recorded by way of x-ray measurements with different x-ray energies after a contrast medium has been applied to the object under examination. In at least one embodiment of the method, a virtual contrast medium image is determined from the high-energy image dataset and the low-energy image dataset and a segmentation image dataset is created, by the area of tissue being segmented. The segmentation result is transferred into the virtual contrast medium image for segmenting the tissue area in the virtual contrast medium image. Finally an analysis of values of the pixels lying in the segmented area is undertaken for identifying pixels which are to be assigned to necrotic tissue. | 10-04-2012 |
20120269318 | METHOD AND COMPUTED TOMOGRAPHY DEVICE AND DATA STORAGE MEDIUM FOR PERFORMING A DYNAMIC CT EXAMINATION ON A PATIENT - In a computed tomography apparatus and operating method, a radiation source and radiation detector are rotated around a system axis, and a patient support plate and diaphragm elements of a diaphragm associated with the x-ray source are also movable in the direction of the system axis. Movement of the patient support plate and the diaphragm plates between respective end positions is coordinated during a dynamic computed tomography examination of a subject so as to reduce and homogenize the dose of x-ray radiation to which the subject is exposed during the examination. | 10-25-2012 |
20130066198 | Contrast Agent Perfusion Adaptive Imaging System - An imaging system selects a medical imaging protocol using a repository of information associating multiple ranges of contrast agent peak time with corresponding different imaging protocols. An imaging protocol comprises a method for acquiring images using an imaging system and using data identifying at least one of (a) an imaging rate within an imaging scan cycle and (b) an interval between imaging scans. A contrast agent peak time comprises a time a contrast agent concentration substantially reaches a peak value in an anatomical region of interest of a patient relative to a time of start of contrast agent injection. A contrast agent peak time detector detects a contrast agent peak time. An imaging processor adaptively selects an imaging protocol from the imaging protocols in response to a comparison of a detected contrast agent peak time with at least one of the plurality of ranges. | 03-14-2013 |
20130077845 | IDENTIFICATION OF POTENTIAL PERFUSION DEFECTS - A method is disclosed for identifying potential perfusion defects in a tissue region through which blood flows in an object under investigation, based on at least one high-energy image data set covering the tissue region and at least one low-energy image data set covering the tissue region. A virtual contrast medium image data set is established based on the high-energy image data set and the low-energy image data set. Furthermore, first candidate perfusion regions within the virtual contrast medium image data set, and second candidate perfusion defect regions within a further image data set based on the high-energy image data set and/or the low-energy image data are detected, the first candidate perfusion defect regions being compared with the second candidate perfusion defect regions and, based on the comparison, potential perfusion defects being identified. Further disclosed are a corresponding image analysis apparatus and a computed tomography system. | 03-28-2013 |
20130083989 | METHOD FOR PRODUCING A NOISE-REDUCED CT IMAGE DATA RECORD, COMPUTER SYSTEM, AND CT SYSTEM - A method is disclosed for producing a noise-reduced CT image data record by frequency band breakdown, a computer system for carrying out the method, and a CT system ( | 04-04-2013 |