839 results about "Flat panel detector" patented technology

An imaging apparatus and related method comprising a source that projects a beam of radiation in a first trajectory; a detector located a distance from the source and positioned to receive the beam of radiation in the first trajectory; an imaging area between the source and the detector, the radiation beam from the source passing through a portion of the imaging area before it is received at the detector; a detector positioner that translates the detector to a second position in a first direction that is substantially normal to the first trajectory; and a beam positioner that alters the trajectory of the radiation beam to direct the beam onto the detector located at the second position. The radiation source can be an x-ray cone-beam source, and the detector can be a two-dimensional flat-panel detector array. The invention can be used to image objects larger than the field-of-view of the detector by translating the detector array to multiple positions, and obtaining images at each position, resulting in an effectively large field-of-view using only a single detector array having a relatively small size. A beam positioner permits the trajectory of the beam to follow the path of the translating detector, which permits safer and more efficient dose utilization, as generally only the region of the target object that is within the field-of-view of the detector at any given time will be exposed to potentially harmful radiation.

An x-ray diffraction-based scanning method and system are described. The method includes screening for a particular substance in a container at a transportation center using a flat panel detector having a photoconductor x-ray conversion layer to detect x-rays diffracted by a particular substance in the container. The diffracted x-rays may be characterized in different ways, for examples, by wavelength dispersive diffraction and energy dispersive diffraction.

There is described an X-ray diagnostic device for performing cephalometric, dental or orthopedic examinations on a patient who is seated or standing. The X-ray diagnostic device comprises an X-ray emitter and an image detector embodied as a flat-panel detector that are arranged situated opposite each other on an orbitally moveable mount. The X-ray diagnostic device further comprises means for adjusting the height of the X-ray emitter and the image detector, a digital image system for recording a projection image using rotation angiography, a device for image processing for reconstructing the projection image into a 3D volume image; and a device for correcting physical effects or artifacts for representing soft tissue in the projection image and in the 3D volume image reconstructed therefrom.

A method, processor and computed tomography (CT) machine for generating images utilizing high and low sensitivity data collected from a flat panel detector having an extended dynamic range. Hardware modifications for extending the dynamic range include grouping pixel rows and pixel columns into clusters of two. The sensitivity of the rows/columns is modified by positioning optical masks that have different transparencies for different rows/columns. Software modifications for extending the dynamic range include taking two correlated exposure scan measurements at each angle and combining the two data sets into one scan prior to image reconstruction. This method uses a spatially varying pixel exposure method where several adjacent pixels are clustered and each cluster has a different sensitivity. The signals of these clusters are combined to form one image effectively producing an increased dynamic range. The flat panel imager may be an a-Si:H based flat panel detector for use in X-ray imaging, including cone beam computer tomography (CBCT).

The invention relates to a noninvasive radiotherapy system for a robot, and belongs to the medical equipment field. The noninvasive radiotherapy system for the robot consists of seven modules, i.e. a radiotherapy planning system, a three-dimensional numerical-control therapy bed, an automatic tracking system for a four-dimensional real-time image, a robot system, a radioactive source, an adjuvant therapy system and an integrated control system, wherein the automatic tracking system for the four-dimensional real-time image consists of a six-freedom-of-degree G-shaped arm real-time image system and an intelligent tracking system; the six-freedom-of-degree G-shaped arm real-time image system is formed by successively connecting a G-shaped arm, a G-shaped arm sliding rail, a G-shaped arm spindle, a G-shaped arm pitch shaft and a G-shaped arm sliding seat; an X ray source and an X ray dynamic flat panel detector are formed into one group, and two groups are correspondingly installed on the G-shaped arm; and the G-shaped arm sliding seat is installed in a rail (9). According to the noninvasive radiotherapy system for the robot, which is disclosed by the invention, the defects of unmatched projection time, time waste and low therapy precision in the prior art are overcome, the precise therapy of the whole body tumor can be carried out, and the cardiovascular disease therapy and the noninvasive regulation of the renal nerve disease can be carried out.

An X-ray imaging system is provided with an X-ray source (11), first and second absorption gratings (31, 32), and a flat panel detector (FPD) (30), and obtains a phase contrast image of an object H by performing imaging while moving the second absorption grating (32) in x direction relative to the first absorption grating (31). The following mathematical expression is satisfied where p₁′ denotes a period of a first pattern image at a position of the second absorption grating (32), and p₂′ denotes a substantial grating pitch of the second absorption grating (32), and D_X denotes a dimension, in the x-direction, of an X-ray imaging area of each pixel of the FPD (30). Here, “n” denotes a positive integer.

D_X≠n×(p₁′×p₂′)/|p₁′−p₂′|

An apparatus for use with a detector system including a solid state flat panel detector and an image processor, the detector including a plurality of pixels, each pixel generating an initial intensity signal, the initial signals together defining an initial image, the processor storing an initial bad pixel map that includes a known bad pixel set, after signals are generated, the processor automatically using intensity signals corresponding to other than the bad pixel set to generate replacement intensity signals for each of the bad pixel set pixels thereby generating a corrected image, the apparatus for identifying additional bad pixels, the apparatus comprising a processor that, after the image data is collected, examines at least one of the initial image and the corrected image to identify a likely additional bad pixel set including pixels that have unexpected values and an interface for indicating the likely bad set to a system user.

An X-ray imaging device includes an X-ray generator, a filter plate detachably attached to an X-ray outlet of the X-ray generator, and a FPD. The filter plate has a plurality of circular markers of different sizes. The smallest marker is disposed at the center of the filter plate. The other markers are disposed on lines radiating from the smallest marker in increasing order of size and at regular intervals. An X-ray radiation beam passes through the markers and patient's body, and is incident upon an imaging surface of the FPD. The FPD produces a preliminary radiographic image from the incident X-ray radiation beam. A deviation vector detector chooses adjoining two marker images of different sizes from the preliminary radiographic image, and identifies to which markers the marker images correspond based on a size ratio. Then, the deviation vector detector determines the center of an X-ray field.

A real time imaging system includes a programmable detector framing node controlling generation of radiation and controlling radioscopic image detection. Radioscopic image data is acquired and communicated by the detector framing node independently of a host computer operating system. The detector framing node controls events in real time according to an event instruction sequence and communicates the received radioscopic image data to host memory through a computer communication bus. The image data is received from a selected flat panel detector of a plurality of different flat panel detectors. The detector framing node is programmable by way of a pair of JTAG loops. The JTAG loops receive programming instructions from the host computer and from a pair of JTAG ports.

The dental fluoroscopic imaging system includes a flat panel detector comprised by a gamma-rays or x-rays converter, a plate, a collector, a processing unit and a transmitter suitable for 2D intraoral/extraoral and 3D extraoral dental fluoroscopy. The x-ray converter contains a material capable of transforming the low dose gamma rays or x-rays beam received from an emitter after going through the dental examination area into electrical signals or a light image consequent with the radiographed image. The plate transmits the electric signals or light image to a collector which amplifies it and sends it to a processing unit and then to transmitter designed to transfer digital images sequentially to a host computer and software which can acquire, process, transform, record, freeze and enhance 2D and 3D images of video frame rates. Two dimensional images are obtained while using a C-arm/U-arm configuration while 3D images are obtained while using the O-arm configuration.

The invention provides a pixel AEC flat panel detector. The pixel AEC flat panel detector comprises a pixel array, a gate drive signal control circuit, a normal pixel signal reading circuit, an AEC signal control processing system, an image information acquisition system and an image information processing system, wherein the pixel array comprises a plurality of normal pixel units and a plurality of AEC pixel units, wherein the plurality of normal pixel units form an array, the plurality of AEC pixel units are distributed in the array by means of replacing normal pixels in the array, each of the normal pixel units is composed of a thin film transistor switch and a photodiode, and each of the AEC pixel units is composed of a photodiode. The pixel AEC flat panel detector provided by the invention is capable of accurately detecting an exposure starting time, automatically controlling an exposure ending time, and automatically controlling an exposure dose. The pixel AEC flat panel detector provided by the invention is simple in structure and suitable for industrial production.

The invention discloses a method of dose reversal of the target of a patient in radiotherapy, the method makes use of a light source and a flat panel detector to carry out the rotary scanning around the target of the patient, so as to obtain the data of the target image of the patient and the dose data which penetrates the target of the patient; the invention applies a virtual PI line reconstruction algorithm to carry out the reconstruction and processing, and the treatment is carried out by adjusting the position of the patient and the input dose distribution data according to the processing results. As the invention adopts a true three-dimensional image reconstruction algorithm which is based on the flat panel detector, the spatial resolution of the true three-dimensional image is isotropic, the invention does not need interpolation, and can directly realize the processing of the image on the three-dimensional space, thus greatly improving the imaging precision and solving the problem that the imaging is not precise due to the interpolation error during the integration process into a quasi three-dimensional image of the existing radiotherapy, which can further affect the accurate implementation of the treatment plan of focus.

An imaging system includes a programmable detector framing node controlling generation of radiation and controlling radioscopic image detection. Radioscopic image data is acquired by the detector framing node and communicated to a host memory of a host computer independently of a host computer operating system. Image data is received from a flat panel detector and is selectively reordered according to parameters of the selected flat panel detector before communication to the host memory. The detector framing node includes an image detection interface to receive the image data and a control unit to select a predetermined portion of the image data for storage into a detector memory unit before communication to the host memory.