Abstract: An imaging system includes a computer programmed to estimate noise in computed tomography (CT) imaging data, correlate the noise estimation with neighboring CT imaging data to generate a weighting estimation based on the correlation, de-noise the CT imaging data based on the noise estimation and on the weighting, and reconstruct an image using the de-noised CT imaging data.

Abstract: An imaging system includes a computer programmed to estimate noise in computed tomography (CT) imaging data, correlate the noise estimation with neighboring CT imaging data to generate a weighting estimation based on the correlation, de-noise the CT imaging data based on the noise estimation and on the weighting, and reconstruct an image using the de-noised CT imaging data.

Abstract: An imaging system includes a computer programmed to estimate noise in computed tomography (CT) imaging data, correlate the noise estimation with neighboring CT imaging data to generate a weighting estimation based on the correlation, de-noise the CT imaging data based on the noise estimation and on the weighting, and reconstruct an image using the de-noised CT imaging data.

Abstract: An imaging system includes a computer programmed to estimate noise in computed tomography (CT) imaging data, correlate the noise estimation with neighboring CT imaging data to generate a weighting estimation based on the correlation, de-noise the CT imaging data based on the noise estimation and on the weighting, and reconstruct an image using the de-noised CT imaging data.

Abstract: An X-ray CT apparatus is provided. The X-ray CT apparatus includes an estimation device configured to estimate a feature quantity that relates to one of image quality and a pixel value of an image obtained by performing an X-ray CT scan on a imaging target under a predetermined scan condition, wherein the feature quantity has a correlative relationship with a dose that is based on data obtained from X-ray imaging performed on the imaging target before a main scan, and a calculation device configured to calculate a dose for the imaging target for a case when an X-ray CT scan is performed under a desired setup scan condition, the dose calculated based on the estimated feature quantity and the correlative relationship between feature quantity and dose.

Abstract: An X-ray CT apparatus includes a first setting device configured to set on a scout image of a subject, a reconstruction range of a tilt image based on a desired tilt angle such that the tilt image includes a region of interest of the subject, a second setting device configured to set on the scout image a range as a scan range for a non-tilt scan, the range being placed on an inner side of a scan range necessary to reconstruct the tilt image with respect to all scan spaces in the reconstruction range, wherein the range includes the region of interest, a scan execution device configured to execute the non-tilt scan on the scan range, and a reconstruction device configured to reconstruct the tilt image including at least the region of interest with respect to the reconstruction range based on projection data acquired during the non-tilt scan.

Abstract: An X-ray CT apparatus includes a first setting device configured to set on a scout image of a subject, a reconstruction range of a tilt image based on a desired tilt angle such that the tilt image includes a region of interest of the subject, a second setting device configured to set on the scout image a range as a scan range for a non-tilt scan, the range being placed on an inner side of a scan range necessary to reconstruct the tilt image with respect to all scan spaces in the reconstruction range, wherein the range includes the region of interest, a scan execution device configured to execute the non-tilt scan on the scan range, and a reconstruction device configured to reconstruct the tilt image including at least the region of interest with respect to the reconstruction range based on projection data acquired during the non-tilt scan.

Abstract: A method for reducing imaging artifacts includes preprocessing a computed tomography (CT) projection data set to generate preprocessed CT projection data, filtering the preprocessed CT projection data using a mean-preserving filter (MPF) to reduce electronic noise, generating a sinogram using the filtered CT projection data, performing a minus logarithmic operation on the sinogram to generate a noise corrected image, and displaying the noise corrected image on a display. A imaging correcting module and a multi-modality imaging system are also described herein.

Abstract: An X-ray CT apparatus includes a first setting device configured to set on a scout image of a subject, a reconstruction range of a tilt image based on a desired tilt angle such that the tilt image includes a region of interest of the subject, a second setting device configured to set on the scout image a range as a scan range for a non-tilt scan, the range being placed on an inner side of a scan range necessary to reconstruct the tilt image with respect to all scan spaces in the reconstruction range, wherein the range includes the region of interest, a scan execution device configured to execute the non-tilt scan on the scan range, and a reconstruction device configured to reconstruct the tilt image including at least the region of interest with respect to the reconstruction range based on projection data acquired during the non-tilt scan.

Abstract: The present invention provides an X-ray attenuation correction method, image generating apparatus, X-ray CT apparatus, and image generating method for correcting for the attenuation of X-ray beam at the boundary where the X-ray absorption rate of a subject is changing. Boundary information comprised of the boundary position where the X-ray absorption rate is changing and the magnitude of change is extracted from the projection information of the subject, then the boundary information is used to multiply the amount of scattered X-ray by the amount corresponding to the magnitude of change at the boundary position, to correct for the attenuation of X-ray at the boundary position. The attenuation of X-ray at the boundary position may be corrected for along with the scattered X-ray correction of the projection information, allowing alleviating artifacts developed in a tomographic image.

Abstract: A collimator control method for an X-ray CT apparatus includes changing an aperture of the collimator according to a position of a helical scan on the body axis of the subject in the progress of the helical scan.

Abstract: A radiation computed tomography apparatus that includes a radiation detector having a plurality of radiation detector elements arranged in a two-dimensional manner for detecting radiation passing through a subject, and a reconstructing device for arithmetically reconstructing tomographic image data for a tomographic image of the subject based on projection data for the subject from each of the plurality of radiation detector elements, the projection data obtained from values detected by the plurality of radiation detector elements, wherein the reconstructing device corrects the projection data for each of the radiation detector elements using a corrective value that is correlated with a path length of the radiation through the subject calculated from the projection data, and generates the tomographic image data based on the corrected projection data.

Abstract: A method for correcting scatter in multi-slice imaging wherein, a projection p and a scatter correction factor R(d, do) are stored in association with each other, a projection p is determined from data D0 collected by imaging a subject with an X-ray beam with a beam thickness d using a detector with a detector thickness do, the scatter correction factor R(d, do) associated with the projection p is determined, and the data D0 is multiplied by the scatter correction factor R(d, do) to obtain scatter-corrected data D1.

Abstract: A method for compensating scattering includes acquiring the projective length of non-subject entities and acquiring the projective length of an object of radiography wherein the object of radiography is radiographed with a beam thickness set to the same value as a detector thickness and the object of radiography is radiographed with the beam thickness set to a value larger than the detector thickness. An amount of scattering is calculated based on the difference between the object data from the first scan and the object data from the second scan and stored in association with the sum of projective lengths. A subject is radiographed to produce data and the projective length of the subject is calculated along with the projective length of the non-subject entities having affected the data. The amount of scattering associated with the sum of the projective length and the projective length is then determined.

Abstract: A method and apparatus for reducing the contrast of a tomographic image due to crosstalk and the occurrence of artifacts and improve the quality of the tomographic image. Detection data are subjected to fitting processing in such a manner that, of the data generated by an X-ray detected by X-ray detection elements disposed in array form in a plurality of X-ray detection modules disposed adjacent to one another, first detection data generated by the X-ray detected by X-ray detection elements adjacent to a boundary between the plurality of X-ray detection modules are adapted to waveform data based on second detection data generated by the X-ray detected by X-ray detection elements lying around the adjacent X-ray detection elements.

Abstract: Improvement of the picture quality of tomograms in an X-ray CT apparatus using a multi-row x-ray detector is to be realized. When conventional scanning (axial scanning) or cine-scanning is to be performed in consecutive different scanning positions in the z-axis direction, the width of the X-ray beam at scanning positions at both ends is kept at exactly or approximately D/2 relative to the multi-row x-ray detector. Alternatively, the interval between one scanning position and another is kept at not more than D. Unevenness of picture quality dependent on positions on the z-axis on a reconstructed plane can be improved.

Abstract: Embodiments of the present invention improve image quality by preventing artifacts from developing. From the projection data obtained by performing a scan for the imaging area of a subject, a tomographic image for a cross-sectional plane of the imaging area is reconstructed. Based on the tomographic image, the density distribution of the imaging area of the subject is then calculated. Thereafter, the scattered radiation beam data is calculated depending on the density distribution, and the projection data is corrected using the scattered radiation beam data. Finally the corrected image is reconstructed based on the corrected projection data.

Abstract: A method for reconstructing an image of an object includes scanning the object with a computed tomography (CT) system to obtain data, estimating a size of the object using the obtained data, using the estimated size of the object to perform scatter correction on the obtained data, and reconstructing an image using the scatter corrected data.

Abstract: A method for reconstructing an image of an object includes scanning the object with a computed tomography (CT) system to obtain data, estimating a size of the object using the obtained data, using the estimated size of the object to perform scatter correction on the obtained data, and reconstructing an image using the scatter corrected data.

Abstract: The present invention provides an X-ray attenuation correction method, image generating apparatus, X-ray CT apparatus, and image generating method for correcting for the attenuation of X-ray beam at the boundary where the X-ray absorption rate of a subject is changing. Boundary information comprised of the boundary position where the X-ray absorption rate is changing and the magnitude of change is extracted from the projection information of the subject, then the boundary information is used to multiply the amount of scattered X-ray by the amount corresponding to the magnitude of change at the boundary position, to correct for the attenuation of X-ray at the boundary position. The attenuation of X-ray at the boundary position may be corrected for along with the scattered X-ray correction of the projection information, allowing alleviating artifacts developed in a tomographic image.