Canon Kabushiki Kaisha

Kabushiki Kaisha Toshiba

Hiroyuki Urushiya

Osamu Tsujii

Kazuhiro Matsumoto

Hiroyuki Shinbata

Yuichi Nishii

Yukihiko Shimizu

Osamu Yoshizaki

Masatoshi Okutomi

Ichiro Yamagishi

Hiroyuki Oumi

An X-ray moving image radiographing apparatus includes an X-ray detector configured to detect an X-ray transmitting through a subject to acquire a subject image, an image processing unit configured to process an X-ray radiographic image output from the X-ray detector, and a control unit configured to capture a mask image by selectively scanning X-ray focal positions of an X-ray source which has a plurality of X-ray focal points so that an X-ray incident angle varies with respect to a target point of the subject, and to capture a moving image after a predetermined work is performed on the subject by selectively scanning X-ray focal positions of the X-ray source similar to the scanning operation used to capture the mask image.

X-ray moving image radiographing apparatus

A system control unit causes a diagnosis monitor to display a plurality of sample images generated by changing one or more image processing parameters used in image processing of an X-ray image. When an operator designates a mixing ratio, at which the sample images are mixed, after the plurality of sample images are displayed on the diagnosis monitor, the system control unit sets one or more image processing parameters to be used when image processing of an X-ray image is performed based on the designated mixing ratio. An image processing unit performs image processing of an X-ray image input from an image input unit based on the set image processing parameter.

Image processing apparatus and image processing method

A radiation image processing apparatus which processes non-spiral projection data obtained by radiation imaging performed by rotating a radiation generator and a two-dimensional radiation detector relative to a subject reconstructs the non-spiral projection data into first volume data subjected to an averaging process in a direction of a rotation axis of the rotation and second volume data not subjected to the averaging process. The radiation image processing apparatus performs planar reconstruction calculation using the first volume data to generate a cross section image in a first plane perpendicular to the direction of the rotation axis and performs planar reconstruction calculation using the second volume data to generate a cross section image in a second plane parallel to the direction of the rotation axis. The resulting cross section images are displayed on a display apparatus.

Radiation image processing apparatus and method thereof

An X-ray image processing apparatus includes a site information determination unit configured to determine, based on discrete site information, continuous site information to be obtained by radiographing a moving image, an information acquisition unit configured to extract, from the discrete site information, image construction information, image processing method information, and X-ray exposure control method information, a computation unit configured to compute processing information about a site located between positions represented by the discrete site information using the information extracted by the information acquisition unit, an image processing unit configured to perform image processing based on the processing information which is computed by the computation unit, and an X-ray exposure control unit configured to perform X-ray exposure based on the processing information which is computed by the computation unit.

X-ray image processing apparatus and method

To perform as high-accuracy as possible a correction for a body movement for reducing an artifact occurring in a case of creating a tomographic image from an X-ray projected image, the coordinates of the respective corresponding points are acquired as between the projected images of which the projected angles overlap each other (e.g., 0&#xb0; and 360&#xb0; ), and a geometric transformation parameter is acquired through affine transformation or the like by using the set of the acquired coordinates. When an estimated amount of the acquired parameter is equal to or larger than a predetermined amount, the geometric transformation parameter for geometric correction is determined by using the acquired geometric transformation parameter, the geometric transformation (correction of body movement) is executed by using the determined geometric transformation parameter, and the tomographic image is created by using the corrected projected images.

Radiation imaging device for correcting body movement, image processing method, and computer program

Time-series data over the range of a projection angle is created from a sinogram. Then, time-series data made up of opposite data corresponding to the time-series data over the range of a projection angle is created. Based on the amount of the error between the two types of time-series data, the amount of position deviation of a revolution axis is calculated.

X-ray CT apparatus and image-taking method therefor

To provide an image processing device and method capable of achieving a high-speed reconstruction process to a cone-beam CT image, an area necessary for reconstruction in a projection image is determined from a slice position to be reconstructed, and a convolution process is executed by using the determined area. Moreover, the slice position to be reconstructed is divided into plural blocks, the areas of the projection image corresponding thereto are cut out, and the processing unit is set for each block as local data of each block, and the set unit is allocated with respect to each operation, whereby parallel processes are executed.

Image processing device and image processing method

An image processing apparatus and method can perform gradation conversion of an image in which flatness of a pixel-value histogram of an image after gradation conversion is excellent, while using a specific gradation conversion function. A gradation conversion function represented using variables for specifying a gradation conversion characteristic is used. The values of the variables are determined based on flatness of a pixel-value histogram of an image obtained by converting an object image with the gradation conversion function. The object image is subjected to gradation conversion with the gradation conversion function determined by the determined values of the variables.

Image processing apparatus and method for performing gradation conversion processing for an object image

To provide image processing device and method capable of achieving a high-speed reconstruction process to a cone beam CT image, an area necessary for reconstruction in a projection image is determined from a slice position to be reconstructed, a convolution process is executed by using the determined area. Moreover, the slice position to be reconstructed is divided into the plural blocks, the areas of the projection image corresponding thereto are cut out, and the processing unit is set for each block as local data of each block, and the set unit is allocated with respect to each operation, whereby parallel processes are executed.

Data of arbitrary penetration thickness can be easily obtained in carrying out a beam hardening calibration. A center tomographic image reconstructed parallel to a center line of a projection data of a water phantom and an X-ray tube is read from an image data server. The read center tomographic image is two-dimensionally modeled on a circle. A radius and a center coordinate of the circle on which the image is two-dimensionally modeled are used to re-arrange the X-ray tube, the sensor, and the modeled circle. Points of intersection A and B of the re-arranged circle and a path along which the X-rays reach the sensor from the X-ray tube are determined to obtain a penetration thickness of the water phantom based on the points of intersection A and B. Accordingly, in order to determine an attenuation property when the X-rays are penetrated through a subject, a larger quantity of data of an output value of a sensor with respect to the penetration thickness is gathered with ease.

Medical information processor, image photographing system, and absorption coefficient calibration method

To obtain a tomographic image suffering little from artifact and the determination of the quality of image. (1) Step 1: With the axis of abscissas as the fan angle or channel direction of an X-ray detector and the axis of ordinates as the projection angle direction of an X-ray sourceprojection data are arranged side by side to thereby prepare a sinogram. (2) Step 2: from the sinogram, the projection data of an opposite fan beam is prepared at each projection angle. (3) Step 3: the degree of consistency with the projection data of the opposite fan beam is obtained at each projection angle. (4) Step 4: The region of reference error of the degree of consistency is obtained, and a projection angle region is determined from this region of reference error. (5) Step 5: the projection data in the projection angle region obtained at the step 4 is reconstructed to thereby prepare a tomographic image.

X-ray CT image taking apparatus and X-ray CT image taking method

An image processing system which processes an image signal, and determines, extracts and corrects defective pixel signals from defective pixels in a sensor array including a plurality of pixels. A given pixel signal from a pixel in the array is determined to be defective if it has a signal level below a threshold value, as determined by an extraction unit which then extracts each defective pixel signal from the defective pixels in the array. A block-forming unit forms positional information for each defective pixel having a defective pixel signal extracted by the extraction unit, with positional information for a group of such extracted defective pixel signals being formed into a block. A storage units stores, in units of blocks, positional information for the defective pixel signals. A correction unit corrects the defective pixel signals by using the positional information, in units of blocks, stored in the storage unit.

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Saitama, Japan

Hiroyuki Urushiya