Abstract: A radiation image processing apparatus for executing image processing on an image obtained by emitting radiation to an object, executes, in order to improve a contrast of the image, processing of extracting a low-frequency component of an input signal of the image to generate a first signal of the image, processing of dividing the input signal of the image by the first signal of the image to generate a second signal of the image, processing of executing non-linear processing on the second signal of the image to generate a third signal of the image, and processing of outputting an output signal of the image obtained by multiplying the input signal of the image by the third signal of the image.

Abstract: Artifacts in a tomographic image of a subject including a cyclically moving object to be treated are reduced. A radiographic imaging device includes: a gantry that is equipped with two sets of radiation sources and detectors which are used in pairs, the gantry rotating the radiation sources and the detectors around a subject; and a reconstruction section that reconstructs a tomographic image of the subject based on multiple projection images generated from output of the detectors. The radiographic imaging device further includes: a phase calculation section; a divide section that divides, on a phase-by-phase basis, first projection image groups of multiple projection images acquired by the first set, and similarly second projection image groups acquired by the second set; and a condition setting section. The reconstruction section reconstructs a tomographic image by use of the first and second projection image groups that are placed in the same phase.

Abstract: An object of the present invention is to non-destructively obtain, in an X-ray imaging apparatus, a sectional image of a subject with spatial resolution higher than spatial resolution of an image detector. In the present invention, the image detector is two-dimensionally moved with respect to an incident X-ray for each half (180°) rotation of the subject, and a plurality of image groups (CT data sets) is obtained at different positions of the image detector. An image (sinogram) is synthesized from each image group thus obtained, which image is equal to an image obtained with a detector whose pixel size is smaller than the pixel size constituting the above described image detector. From this synthesized image, a sectional image with high spatial resolution is calculated by reconstruction calculation.

Abstract: A radiotherapy system acquires an image which is necessary for positioning of a patient for radiation treatment and enables grasping of a positional relationship of a target in a treatment radiation irradiated state, a radiation passing area and a critical organ. An X-ray imaging device is attached to the rotatable support device and configured to apply X-rays to the subject from plural directions while rotating around the subject to perform X-ray imaging. A target recognizing device recognizes a three-dimensional position of the target in the subject from X-ray images acquired by the X-ray imaging device; and CT image generating devices are configured to select, from the X-ray images acquired by the X-ray imaging device, the images in which the position of the target recognized by the recognizing device satisfies the treatment radiation irradiation condition for the motion tracking treatment to perform image reconstruction and generate a cone beam CT image.

Abstract: An object of the present invention is to non-destructively obtain, in an X-ray imaging apparatus, a sectional image of a subject with spatial resolution higher than spatial resolution of an image detector. In the present invention, the image detector is two-dimensionally moved with respect to an incident X-ray for each half (180°) rotation of the subject, and a plurality of image groups (CT data sets) is obtained at different positions of the image detector. An image (sinogram) is synthesized from each image group thus obtained, which image is equal to an image obtained with a detector whose pixel size is smaller than the pixel size constituting the above described image detector. From this synthesized image, a sectional image with high spatial resolution is calculated by reconstruction calculation.

Abstract: Irrespective of the layout, moving path, and moving range of the X-ray source and the detector, a highly precise image is acquired, in a similar manner as an X-ray CT scanner that is capable of acquiring a measured image using a rotation angle of 180 degrees or more. A measured image detected by the detector is converted into a rotationally measured image that is acquired by rotationally moving the X-ray source and the detector along concentric circular paths. Then, the rotationally measured image at every measurement angle is provided with a weight that gives intensity variation equivalent to that of the reconstructed image obtained from the rotationally measured images acquired by the measurement using the rotation angle range of 180 degrees, a reconstruction operation is performed, and a reconstructed image is obtained.

Abstract: Irrespective of the layout, moving path, and moving range of the X-ray source and the detector, a highly precise image is acquired, in a similar manner as an X-ray CT scanner that is capable of acquiring a measured image using a rotation angle of 180 degrees or more. A measured image detected by the detector is converted into a rotationally measured image that is acquired by rotationally moving the X-ray source and the detector along concentric circular paths. Then, the rotationally measured image at every measurement angle is provided with a weight that gives intensity variation equivalent to that of the reconstructed image obtained from the rotationally measured images acquired by the measurement using the rotation angle range of 180 degrees, a reconstruction operation is performed, and a reconstructed image is obtained.

Abstract: A radiotherapy system acquires an image which is necessary for positioning of a patient for radiation treatment and enables grasping of a positional relationship of a target in a treatment radiation irradiated state, a radiation passing area and a critical organ. An X-ray imaging device is attached to the rotatable support device and configured to apply X-rays to the subject from plural directions while rotating around the subject to perform X-ray imaging. A target recognizing device recognizes a three-dimensional position of the target in the subject from X-ray images acquired by the X-ray imaging device; and CT image generating devices are configured to select, from the X-ray images acquired by the X-ray imaging device, the images in which the position of the target recognized by the recognizing device satisfies the treatment radiation irradiation condition for the motion tracking treatment to perform image reconstruction and generate a cone beam CT image.

Abstract: Disclosed is an X-ray imaging apparatus in which a correction function used to correct scattered X-rays and a correction function used to correct beam hardening can be simply and precisely determined so that the correcting operations are performed in an appropriate sequence using the correction functions thus determined to enhance the precision in the correction and improve the image quality. The scattered X-rays and the beam hardening are corrected sequentially in this order, using the scattered X-ray correction function and the beam hardening correction function, both calculated using measured data for calculating the correction functions. The scattered X-ray correction function approximates as to each transmission distance, the data measured with changes in the transmission distance and with changes in the scattered X-ray amount, and associates the correction value thus obtained with transmittance data.

Abstract: Disclosed is an X-ray imaging apparatus in which a correction function used to correct scattered X-rays and a correction function used to correct beam hardening can be simply and precisely determined so that the correcting operations are performed in an appropriate sequence using the correction functions thus determined to enhance the precision in the correction and improve the image quality. The scattered X-rays and the beam hardening are corrected sequentially in this order, using the scattered X-ray correction function and the beam hardening correction function, both calculated using measured data for calculating the correction functions. The scattered X-ray correction function approximates as to each transmission distance, the data measured with changes in the transmission distance and with changes in the scattered X-ray amount, and associates the correction value thus obtained with transmittance data.

Abstract: An X-ray measuring instrument in which an object under examination is irradiated with X-rays, measurement data on the object is detected, a filter for adjusting the amount of transmitted X-rays is disposed between an X-ray source and the object, the relative position of the X-ray source to the object is varied, and the acquired measurement data is computed. The measurement data is subjected to logarithm transform to acquire projection data, and the amount of absorbed X-rays of the filter corresponding to the acquired projection data is determined. The thickness of the filter is computed by using a predetermined transform formula for the acquired amount of absorbed X-rays. A correction coefficient corresponding to the projection data acquired from the computed thickness of the filter is determined, and the projection data is multiplied by the determined correction coefficient. The projection data multiplied by the correction coefficient is restructure-computed to obtain a three-dimensional image.

Abstract: In an X-ray measuring instrument, X-rays are irradiated to an object, measurement data concerning the object is detected, a filter that regulates an exposure of X-rays to be transmitted is interposed between an X-ray source and the object, the position of the X-ray source relative to the object is changed, and the detected measurement data is computed. The measurement data is logarithmically converted in order to produce projection data. The X-ray absorption of the filter relevant to the produced projection data is obtained. The thickness of the filter is calculated by applying a predetermined conversion expression to the obtained X-ray absorption. A correction coefficient for the projection data is obtained based on the calculated thickness of the filter. The projection data is multiplied by the obtained correction coefficient. The projection data multiplied by the correction coefficient is computed for reconstruction in order to produce a three-dimensional image.

Abstract: An x-ray measuring apparatus comprises an x-ray source, an x-ray detector, a rotating device, and a processor. The x-ray source generates x-rays to be emitted to a subject. The x-ray detector detects measurement data regarding the subject. The rotating device changes a relative position of the x-ray source and the x-ray detector with respect to the subject. The x-ray detector is shifted by a distance shorter than half the length of the x-ray detector along a line parallel to the plane of rotation, in a tangential direction of the plane of rotation generated by the x-ray source. The processor obtains projection data by executing a logarithmic converting process for the measurement data, multiplies a value of the projection data by a weight, and obtains reconstructed data therefrom.

Abstract: The present invention provides an x-ray measuring apparatus for diagnosis having high spatial resolution and high sensitivity, which includes: an x-ray source for emitting x-rays from an x-ray focal spot; an x-ray detector in which a plurality of sensing elements each having a sensitive part and a blind part surrounding the sensitive part are arranged two-dimensionally; data processing means for collecting output signals of the sensing elements and performing data processing; and an anti-scatter grid disposed between the x-ray focal spot and the x-ray detector with predetermined distance from the position of the x-ray focal spot and in which an x-ray transmitting member and an x-ray shielding member are alternately arranged in a first direction.

Abstract: An x-ray measuring apparatus comprises an x-ray source, an x-ray detector, a rotating device, and a processor. The x-ray source generates x-rays to be emitted to a subject. The x-ray detector detects measurement data regarding the subject. The rotating device changes a relative position of the x-ray source and the x-ray detector with respect to the subject. The processor executes an arithmetic operation for the measurement data. The x-ray detector is shifted by a distance shorter than half the length of the x-ray detector along a line parallel to the plane of rotation, in a tangential direction of the plane of rotation generated by the x-ray source 201.

Abstract: The present invention provides an x-ray measuring apparatus for diagnosis having high spatial resolution and high sensitivity, which includes: an x-ray source for emitting x-rays from an x-ray focal spot; an x-ray detector in which a plurality of sensing elements each having a sensitive part and a blind part surrounding the sensitive part are arranged two-dimensionally; data processing means for collecting output signals of the sensing elements and performing data processing; and an anti-scatter grid disposed between the x-ray focal spot and the x-ray detector with predetermined distance from the position of the x-ray focal spot and in which an x-ray transmitting member and an x-ray shielding member are alternately arranged in a first direction.

Abstract: An X-ray based measuring device of the invention includes: X-ray imaging means (102, 103, 311) which have their detection areas divided into a plurality of detector units (102a to 102d, 201′), detect X-rays transmitted through an inspection object (106), and pick up X-ray images in interested areas (310, 902, 902′) of the inspection object; conversion means (211, 212) for converting analog image signals read from the detector units into digital image data under specified conversion conditions for each of the detector units; and re-conversion means (214, 222) for converting the digital image data obtained for each of the detector units under re-conversion conditions corresponding to the specified conversion conditions, wherein analog image signals are A/D converted into digital image data under optimum conversion conditions for each detector unit, and X-ray images in interested areas of the inspection object are sequentially picked up.

Abstract: Between an X-ray generating system and an X-ray image detecting system arranged opposite to the X-ray generating system, an examination object supporting system is arranged and contains a straight movement table provided on a rotary table supported by a rotary table supporting member, and an examination object supporting member for supporting the examination object under either a standing position or a sitting position on the straight movement table. While the examination object is rotated by the rotary table, the examination object is continuously moved (reciprocating movement) by the straight movement table along a direction parallel to the rotation plane, and X-ray images of the examination object are acquired along a plurality of directions during both the rotating operation and the moving operation. As a result, both an X-ray tomographic image and a three-dimensional image (stereoscopic image) of a wider area than a viewing field of an X-ray I.I. can be acquired.

Abstract: The method for generating an X-ray image of the present invention by correcting a measured fluorographic image or radiographic image and removing the veiling glare component and scattered X-ray component has (1) a step of generating a veiling glare component image and a scattered X-ray component image corresponding to the fluorographic image or radiographic image from the measured fluorographic image or radiographic image independently and (2) a step of obtaining the difference between the measured fluorographic image or radiographic image and the veiling glare component image and scattered X-ray component image and executes a correction of removing the veiling glare component and scattered X-ray component from the measured fluorographic image or radiographic image.

Abstract: An X-ray apparatus acquires an X-ray image of an object by radiating X-rays to the object and includes an X-ray radiator for radiating X-rays to an object. An imager acquires an X-ray image of the object and radiation dose controller controls the radiation dose so as to acquire an X-ray image having a predetermined X-ray relative noise level on the basis of an image level of a predetermined area in the X-ray image.