Patent application number | Description | Published |
20080205587 | X-RAY CT DEVICE AND METHOD OF CONTROLLING THE SAME - An X-ray CT device generates an X-ray beam in the shape of a cone along the body axis of a subject from an X-ray tube to the subject and detects the X-rays that pass the subject by a two-dimensional detection system during a linear track scan. In addition, the X-ray CT device detects X-rays from a relative rotation movement of the X-ray tube and the subject during the linear track scan under the same condition. A reconstruction device reconstructs an image by back projection of the data of the subject based on the X-rays detected in the two scans. | 08-28-2008 |
20080212735 | X-RAY CT DEVICE - An X-ray CT device according to the present invention produces an X-ray beam of a cone shape in the direction of the body axis of a subject from an X-ray source, performs a helical scanning operation in accordance with the relative movement and relative rotational motion of the X-ray source and the subject, processes data that is collected by a data collecting unit, and reconstructs an image by back-projecting the processed data at a reconstruction processing unit. When the moving speed of the bed is defined, a system controlling unit determines the optimal collection condition for a two-dimensional array-type X-ray detector. | 09-04-2008 |
20080226022 | X-RAY CT SYSTEM, OBJECT-OUTLINE ESTIMATING METHOD, AND IMAGE RECONSTRUCTING METHOD - X-ray transmission data of a specific direction is extracted from X-ray transmission data obtained by rotating an X-ray tube irradiating an X-ray around an object. The outline of the object is calculated based on the X-ray transmission data of the specific direction. Then, based on this outline, the X-ray transmission data is corrected, and an image of the inside of the object is reconstructed from the corrected X-ray transmission data. | 09-18-2008 |
20080298539 | X-RAY CT APPARATUS AND METHOD OF CONTROLLING THE SAME - In an X-ray CT apparatus, the X-ray tube generates an X-ray beam during a line-orbit scan, and the collimator plate shields a part of the X-ray beam other than the part that contributes to image reconstruction. The part of the X-ray beam which contributes to the image reconstruction is applied to a subject along the body axis of the subject. The two-dimensional detector system detects the X rays in the same conditions during a circular-orbit scan, while the X-ray tube and the subject are rotating relative to each other. The reconstruction device performs back projection, thereby reconstructing an image. | 12-04-2008 |
20090016485 | X-RAY COMPUTED TOMOGRAPHY APPARATUS, RECONSTRUCTION PROCESSING APPARATUS, AND IMAGE PROCESSING APPARATUS - An X-ray computed tomography apparatus scans a subject to be examined with cone beam X-rays, and generates reference volume data on the basis of projection data. This apparatus extracts a cone beam artifact component contained in the reference volume data on the basis of the typical shape and direction of the cone beam artifact component. This apparatus generates resultant volume data with the reduced cone beam artifact by subtracting the cone beam artifact component from the reference volume data. | 01-15-2009 |
20090028288 | X-RAY COMPUTED TOMOGRAPHY APPARATUS - An X-ray computed tomography apparatus includes a gantry, a reconstruction processing unit which generates first volume data on the basis of a projection data set which covers an angle range of 180°±a fan angle and also generates second volume data on the basis of a projection data set which covers an angle range of 360°, a correction data generating unit which generates correction data for reducing a cone beam artifact on the basis of a difference between the first volume data and the second volume data, and a correction unit which corrects the first volume data on the basis of the correction data. | 01-29-2009 |
20090110139 | X-RAY COMPUTED TOMOGRAPHY APPARATUS - A control unit performs helical scanning an subject while moving a top along a direction substantially parallel to a body axis. An acquisition unit acquires projection data via an X-ray detector. A projection data extraction unit extracts a projection data set necessary for the reconstruction of image data associated with a predetermined slice position from the projection data. A weighting unit assigns a smaller weight to first projection data of the extracted projection data than a weight assigned to second projection data, the first projection data being acquired outside a predetermined period including a predetermined acquisition time of the projection data at the predetermined slice position, the second projection data being acquired within the predetermined period. A reconstruction processing unit reconstructs image data on the basis of the first projection data and the second projection data to which the weights are assigned. | 04-30-2009 |
20100150421 | X-RAY COMPUTED TOMOGRAPHY APPARATUS, MEDICAL IMAGE PROCESSING APPARATUS, X-RAY COMPUTED TOMOGRAPHY METHOD, AND MEDICAL IMAGE PROCESSING METHOD - An X-ray computed tomography apparatus includes, an X-ray source which irradiates an object with X-rays spreading in a slice direction, an X-ray detector including a plurality of X-ray detection elements which are juxtaposed in the slice direction and detect X-rays transmitted through the object, a reconstruction unit which includes a back-projection unit which obtains back-projection data relating to each of a plurality of pixels defined in an imaging area by performing back projection of data acquired by the X-ray detector and an interpolation unit which interpolates the data, and performs reconstruction processing for an image, and a setting unit which sets central positions of a plurality of pixels in the imaging area in the reconstruction processing to positions offset from positions corresponding to centers of the X-ray detection elements in the slice direction. | 06-17-2010 |
20110075905 | X-RAY COMPUTED TOMOGRAPHY APPARATUS AND IMAGE PROCESSING METHOD - According to one embodiment, an X-ray computed tomography apparatus includes an X-ray generating unit and an area detector. The reconstruction processing unit reconstructs first and second volume data including an overlap region. The extraction unit extracts first and second slice images from the first and the second volume data respectively. The calculation unit calculates the difference value between a sum of pixel values in the first slice images and the sum of pixel values in the second slice images. The determination unit determines whether the difference value falls within a predetermined range. The combining unit combines the first and second volume data and sets a pixel value in the overlap region to a pixel value of the first volume data, a pixel value of the second volume data, or a value derived from pixel values of the first and second volume data. | 03-31-2011 |
20110075907 | X-RAY COMPUTED TOMOGRAPHY APPARATUS AND IMAGE PROCESSING APPARATUS - According to one embodiment, An X-ray CT apparatus includes acquisition unit, intermediate image generating unit, weighting factor calculating unit, and resultant image generating unit. The intermediate image generating unit generates a first image based on a first projection data set and a second image based on a second projection data set. The first projection data set falls within a first view angle range of projection data acquired by the acquisition unit. The second projection data set falls within a second view angle range of the projection data. The second view angle range is narrower than the first view angle range. The weighting factor calculating unit calculates a weighting factor corresponding to a pixel value difference between the first image and the second image. The resultant image generating unit generates a resultant image associated with weighted addition of the first image and the second image based on the weighting factor. | 03-31-2011 |
20110280459 | X-RAY COMPUTED TOMOGRAPHY APPARATUS - According to one embodiment, an X-ray computed tomography apparatus includes an X-ray tube, an X-ray detector, and a rotating unit. The first reconstruction processing reconstructs a clinical image based on projection data detected by the X-ray detector. The second reconstruction processing reconstructs a noise image based on noise data. The clinical image is combined with the noise image. | 11-17-2011 |
20120288178 | MEDICAL IMAGE PROCESSING APPARATUS, A MEDICAL IMAGING APPARATUS, AND A METHOD OF PROCESSING MEDICAL IMAGES - A medical image processing apparatus includes a difference calculator, a removal part, a first statistical processing part, and an estimation part. The difference calculator receives a plurality of medical image data with different imaging positions and obtains the difference between the plurality of medical image data, thereby generating difference image data that represents the difference. The removal part removes the region corresponding to a structure from the difference image data. The first statistical processing part obtains the first standard deviation of pixel values of each pixel of the difference image data with the region corresponding to the structure removed. The estimation part estimates the second standard deviation of the medical image data based on the first standard deviation. The medical image processing apparatus can estimate noise level of medical image data. | 11-15-2012 |
20120321036 | X-RAY CT SCANNER AND IMAGE PROCESSING APPARATUS - According to one embodiment, an X-ray CT scanner includes a gantry unit, a reconstruction unit, an extraction unit, and an output unit. The gantry unit includes an X-ray source and an X-ray detector and is configured to rotate the source and the detector. The reconstruction unit generates reconstruction image data by using data acquired by the detector. The extraction unit extracts, when using a predetermined phantom as the object, pixel values of pixels existing on a locus surrounding a tomographic image of the phantom contained in reconstruction image data generated by the reconstruction unit based on data acquired by the detector. The output unit outputs an extraction result obtained by the extraction unit or information obtained based on the extraction result. | 12-20-2012 |
20130129037 | X-RAY CT APPARATUS AND IMAGE PROCESSING APPARATUS - According to one embodiment, an X-ray CT apparatus includes an generation unit, detection unit, processing unit, and reconstruction unit. The generation unit irradiates an object with X-rays. The detection unit includes detection elements corresponding to a plurality of channels, which output detection signals upon detecting X-rays. The processing unit smoothes projection data constituted by numerical values corresponding to signals output from the elements so as to more strongly smooth a portion exhibiting a larger amount of change in the numerical value. The reconstruction unit reconstructs an image by using a plurality of projection data smoothed by the image processing unit. | 05-23-2013 |
20130195240 | X-RAY CT SYSTEM - In the X-ray CT system according to an embodiment, a control means displaces and images imaging regions in the subject by controlling a top board driver and an imaging means such that the X-rays are projected onto the subject every time a top board is moved by a predetermined transfer amount. An acquiring means acquires projection data of the respective imaging regions. A reconstruction means, based on the projection data, reconstructs tomographic images for each predetermined size of a reconstruction region. In the scan control mode, the control means outputs the transfer amount corresponding to this mode to the top board driver. In the reconstruction control mode, the control means outputs the size of the reconstruction region corresponding to this mode to the reconstruction means. | 08-01-2013 |
20130208853 | X-RAY DIAGNOSTIC SYSTEM AND X-RAY DIAGNOSTIC METHOD - An X-ray diagnostic system according to an embodiment includes: an X-ray tube for radiating an X-ray to the subject on the basis of a tube current for taking a scanogram of a subject; an X-ray detector for detecting the X-ray radiated by the X-ray tube and transmitted through the subject; a data collector for collecting X-ray dose distribution data, which shows the dose distribution of the X-ray; an image processor for creating the scanogram from the X-ray dose distribution data; a genuine data generator for generating genuine data showing the dose distribution of the X-ray, from the scanogram; a threshold value setting section for setting a threshold value for the genuine data; and a tube current adjustor for adjusting a tube current for taking a tomographic image of the subject in accordance with a comparison between the X-ray dose in the genuine data and the threshold value. | 08-15-2013 |
20130251094 | MULTISLICE CT APPARATUS AND METHOD FOR DATA PREPROCESSING - A multislice CT apparatus includes a setting unit, a correcting unit, a filtering unit and a reconstructing unit. The setting unit sets a weighting coefficient in such a way that data on a middle column is weighted high while data on columns on both sides of the middle column is weighted low on a middle channel in a multislice detector, and that a weight given to data on a middle column falls while a weight given to data on both side columns rises as shifting from the middle channel to an end channel. The correcting unit corrects the weighting coefficient in such a way that a weight rises as shifting from a central column to an end column. The filtering unit filters data on the basis of the corrected weighting coefficient in a column direction. The reconstructing unit reconstructs an image on the basis of the filtered data. | 09-26-2013 |
20130251102 | IMAGE DIAGNOSIS APPARATUS AND METHOD - According to the present embodiment, an image diagnosis apparatus includes a first image taking device that takes an image of a patient placed on a couchtop by using an X-ray emission; a second image taking device that takes images in positions by moving an image taking position of the patient by a predetermined distance at a time, along the body-axis direction; a position estimating unit; and a correction processing unit. The position estimating unit estimates a couchtop position for each of the image taking positions of the second image taking device, based on information about warping of the couchtop of the first image taking device. The correction processing unit uses information about the couchtop positions estimated by the position estimating unit, for performing a position correcting process on the images obtained by the image taking devices. | 09-26-2013 |
20130308744 | X-RAY COMPUTED TOMOGRAPHY APPARATUS, MEDICAL IMAGE PROCESSING APPARATUS, X-RAY COMPUTED TOMOGRAPHY METHOD, AND MEDICAL IMAGE PROCESSING METHOD - An X-ray computed tomography apparatus includes, an X-ray source which irradiates an object with X-rays spreading in a slice direction, an X-ray detector including a plurality of X-ray detection elements which are juxtaposed in the slice direction and detect X-rays transmitted through the object, a reconstruction unit which includes a back-projection unit which obtains back-projection data relating to each of a plurality of pixels defined in an imaging area by performing back projection of data acquired by the X-ray detector and an interpolation unit which interpolates the data, and performs reconstruction processing for an image, and a setting unit which sets central positions of a plurality of pixels in the imaging area in the reconstruction processing to positions offset from positions corresponding to centers of the X-ray detection elements in the slice direction. | 11-21-2013 |
20140029717 | X-RAY COMPUTED TOMOGRAPHY APPARATUS AND RECONSTRUCTION PROCESSING METHOD - According to one embodiment, an X-ray computed tomography apparatus includes an X-ray generation unit, an X-ray detection unit, a unit to reconstruct volume data for a reconstruction region having an operator-designated diameter based on projection data, a unit to generate interpolation data based on measurement data to complete projection data for end portions of the reconstruction region wherein the projection data required for reconstructing the volume data of a middle portion of the reconstruction region is acquired as the measurement data, and a unit to decide a width of the end portions based on the set radiation range along the top's longitudinal direction, reconstruction region's diameter, and object's imaging target portion. | 01-30-2014 |
20140169521 | X-RAY CT SYSTEM - X-ray CT system is provided that reduces waiting time for shuttle scanning, comprising: top-plate moving unit; rotary moving unit; data acquisition system; and control unit. Top-plate moving unit displaces top plate to reciprocate in a direction from a starting point to an ending point and in the direction from the ending point to the starting point. Rotary moving unit drives X-ray radiator radiating X-rays to revolve around the subject. Data acquisition system detects X-rays passed through the subject and to gather projection data. Controller controls at least top-plate moving unit so that, during a scanning with X-rays, while projection data are gathered with reciprocating movement of top plate between the starting point and the ending point and with X-ray radiator being driven to make revolving movement, the duration required for reciprocation of the top plate movement being an integral multiple of revolution period of the revolving movement of X-ray radiator. | 06-19-2014 |
20140177934 | IMAGE DIAGNOSIS DEVICE AND CONTROL METHOD THEREOF - An image diagnosis device comprising: a positioning image collection unit configured to collect a positioning image for an object; a weight distribution estimation unit configured to estimate a weight distribution of the object from the collected positioning image; a top board sagging amount estimation unit configured to estimate an amount of sagging of a top board on which the object is placed, from the estimated weight distribution; and an alignment adjustment unit configured to perform alignment for each captured image of the object, based on the estimated amount of sagging of the top board. | 06-26-2014 |