A data acquisition device, which has an X-ray detector including a plurality of channel widths at which channels at its central portion are fine and channels at its peripheral portions are coarse or rough, and a plurality of data acquisition ranges including a data acquisition range wide in a channel direction and a data acquisition range narrow in the channel direction, and which is capable of performing switching among the data acquisition ranges for each data acquisition, is used to perform data acquisition on the channels fine at the central portion in the data acquisition range narrow in the channel direction, whereby an X-ray CT apparatus is provided which is capable of performing high-resolution imaging and brings about more satisfactory image quality.

X-ray ct apparatus

An object rotating type cone beam radiation CT radiographing device in which a high speed and high sensitivity are obtained with low costs is provided. Thus, a radiation CT device of high performance for vehicle-mounted use and group medical examination can be provided at low costs. In the object rotating type cone beam radiation CT radiographing device, a rotational angle of an object is detected, a signal storage period of a batch-exposure type radiation image sensor panel is controlled on the basis of the rotational angle signal, and a signal storage period of a signal storage type reference signal generator is controlled. There is provided a radiation CT radiographing device in which the object can be photographed at arbitrary resolution during the photographing, a fluctuation of a radiation source during the photographing can be detected without using a special detector and corrected in accordance with its detection amount.

Radiation CT radiographing device, radiation CT radiographing system, and radiation CT radiographing method using the same

An X-ray inspection device includes an X-ray detecting unit, a determining unit, and an output unit. The X-ray detecting unit is configured and arranged to detect a level of X-rays passing through an article. The determining unit is configured to determine a state of the article based on a detection level of the X-rays detected by the X-ray detecting unit using a plurality of thresholds including a first threshold and a second threshold for a single determination criterion. The output unit is configured and arranged to output a result of determination made by the determining unit.

X-ray inspection device

A method and system for performing fluoroscopic imaging of a subject has high temporal and spatial resolution in a center portion of the captured dynamic images. The system provides for reduced X-ray dose to the patient associated with that part of the X-ray beam associated with a peripheral portion of the captured images although temporal, and in some embodiments spatial, resolution is reduced in the peripheral portion of the image. The system uses a rotating collimator to produce an X-ray beam having narrow wing portions associated with the peripheral portions of the image, and a broader central region associated with the high resolution center portion of the images.

Method and system for dynamic low dose X-ray imaging

A calibrated real-time, high energy X-ray imaging system is disclosed which incorporates a direct radiation conversion, X-ray imaging camera and a high speed image processing module. The high energy imaging camera utilizes a Cd-Te or a Cd-Zn-Te direct conversion detector substrate. The image processor includes a software driven calibration module that uses an algorithm to analyze time dependent raw digital pixel data to provide a time related series of correction factors for each pixel in an image frame. Additionally, the image processor includes a high speed image frame processing module capable of generating image frames at frame readout rates of greater than ten frames per second to over 100 frames per second. The image processor can provide normalized image frames in real-time or can accumulate static frame data for substantially very long periods of time without the typical concomitant degradation of the signal-to-noise ratio.

High energy, real time capable, direct radiation conversion X-ray imaging system for Cd-Te and Cd-Zn-Te based cameras

PROBLEM TO BE SOLVED: To provide a radiation detector, a radiation detecting system and an X-ray CT system in which the number of arrays can be increased. SOLUTION: The radiation detector has a scintillator 9 for converting incident X-rays from the surface side into light, a photodiode chip 2 having a photodiode 3 for converting the light thus converted into an electrical signal, a switching chip 4 having a transistor 5 for reading out a signal from the photodiode 3, and a data collecting chip 8 for amplifying and digitizing a signal thus read out, and the photodiode chip 2, the switching chip 4 and the data collecting chip 8 are mounted commonly on a rigid multilayer wiring board 30.

Radiation detector, radiation detecting system, x-ray ct system

An X-ray computer tomography apparatus includes an X-ray tube, an X-ray detector, a data collection apparatus that collects X-ray signals from the X-ray detector repeatedly, a shutter mechanism that is arranged between the X-ray tube and a subject in order to convert an X-ray into a pulse-like X-ray and is constituted such that a ratio of a shutter open period and a shutter close period is variable, a restructuring unit that restructures image data on the basis of the collected X-ray signals, and a control unit that controls the shutter mechanism in order to change the ratio of a shutter open period and a shutter close period during a helical scan.

X-ray computer tomography apparatus

PROBLEM TO BE SOLVED: To surely reduce blur components of each pixel caused by basic performances and photographing conditions of a photographic device from the photographed three-dimensional image data, and to make the result of the image processing, which uses the three-dimensional image data, high accuracy and high quality. SOLUTION: A blur function for reducing the blur of each pixel of the three-dimensional image data of the real space, which is obtained by photographing the inside structure of a subject under the given photography parameter, is set according to at least one of the parameter showing the basic performances of the photographic device and the photography parameter, and a correcting processing is done for reducing the blur of the image data by using of the set blur function. For instance, the blur function is a PSF (point spread function) and the correcting processing is a de-convolution processing. This correcting processing can be done in each axis direction of X, Y and Z. COPYRIGHT: (C)2005,JPO&NCIPI

Image data processing apparatus and image data processing method

PROBLEM TO BE SOLVED: To control exposure dose by controlling X-ray pulse width. SOLUTION: An X-ray computerized tomography apparatus is equipped with an X-ray tube 10 for generating X-rays, an X-ray detector 23 for detecting X-rays transmitting a subject, a data acquisition part 24 for repeatedly acquiring X-ray signals from the X-ray detector, a shutter mechanism part 22 which is disposed between the X-ray tube and the subject to convert the generated X-rays to pulse X-rays and is constituted to vary a ratio between a shutter opened period and a closed period, a reconstruction part 36 for reconstructing image data based on the acquired X-ray signals, and a shutter shift controller 41 controlling the shutter mechanism part to change the ratio between the shutter opened period and the closed period. COPYRIGHT: (C)2006,JPO&NCIPI

X-ray computerized tomography apparatus

PROBLEM TO BE SOLVED: To provide a radiation detector, a radiation detection system, and an X-ray CT system, capable of increasing the number of columns SOLUTION: The radiation detection system comprises a scintillator for converting X-rays, incident from a surface side into light; at least one photodiode chip provided with a plurality of photodiodes for converting the converted light into electrical signals; at least one switching chip, provided with a plurality of switching elements for reading a plurality of signals from among a plurality of the photodiodes; at least one data acquisition chip provided with a plurality of digital data acquisition sections for amplifying a plurality of signals that have been read out for digitizing; and a rigid printed-wiring board for commonly mounting the photodiode chips, the switching chips, and the data acquisition chips COPYRIGHT: (C)2008,JPO&INPIT

Toshihiro Rifu

Papers

Radiation detector, radiation detecting system, x-ray ct system

X-ray computer tomography apparatus

Image data processing apparatus and image data processing method

X-ray computerized tomography apparatus

Radiation detector, radiation detection system, and x-ray computer tomography system