Provided are an X-ray detector having fabrication fault tolerant structure and a method for manufacturing the same using a micro-transfer printing (MTP) technique. The X-ray detector may include a photodiode layer formed on a base substrate within a pixel area and including a plurality of photodiode pixel units, a dummy layer formed the base substrate within a peripheral area, a plurality of pixel driving integrated chips printed on the photodiode layer, a plurality of primary column and row integrated chips printed on the dummy layer, and metal lines coupling the column and row integrated chips with pixel driving integrated chips and other constituent elements, wherein the plurality of pixel driving integrated chips and primary column and row integrated chips are manufactured separately from the photodiode layer and the dummy layer and attached on the photodiode layer and the dummy layer, respectively.

An X-ray CT apparatus of an embodiment includes a processing circuitry. The processing circuitry detects X-rays radiated from an X-ray tube in units of photons. The processing circuitry stores first energy spectrum information acquired by detecting X-rays at a first timing. The processing circuitry acquires second energy spectrum information by detecting X-rays at a second timing after the first timing. The processing circuitry determines a state of the X-ray tube on the basis of the first energy spectrum information and the second energy spectrum information.

A method for correcting inaccuracies in a three-dimensional (3D) rendered volume of an object due to deviations between an actual scanner translation speed and an expected scanner translation speed, the method comprising: placing a pre-measured reference adjacent to the object which is being scanned so that the pre-measured reference and the object are in the same scan field; scanning the object and the pre-measured reference so that the object and the pre-measured reference are both incorporated in a 3D rendered volume produced through scanning; comparing the 3D rendered volume of the pre-measured reference against the 3D volume of the true pre-measured reference and generating a correction map indicative of how the rendered 3D volume of the pre-measured reference should be adjusted so as to produce a more accurate 3D rendering of the pre-measured reference; and using the correction map to adjust the rendered 3D volume of the object.

An acceleration sensor (10) is attached to a collimator (12) and detects an acceleration of the collimator (12), and a speed calculation unit that calculates the speed of the collimator 12 on a basis of the acceleration detected by the acceleration sensor (10). When the speed of the collimator (12) exceeds a setting speed that is set in advance, a lifting or lowering of an arm (13) is stopped by attaching a permanent electromagnet (42) to a stopper plate (43). In addition, a warning message as a warning indication is displayed on a display unit, and a warning sound as a warning indication is generated from a speaker. Accordingly, damage to an apparatus is prevented.

A calibration method for an x-ray computerized tomography system and a method of tomographic reconstruction are provided. The calibration method includes steps of measuring at least one point spread function (PSF) at each of a plurality of points, compressing each PSF, and in one or more storing operations, storing the compressed PSFs in a computer-accessible storage medium. The PSF measurements are made in a grid of calibration points in a field of view (FOV) of the system. In the measuring step, an absorber is positioned at each of the calibration points, and an x-ray projection is taken at least once at each of those absorber positions. In the method of tomographic image reconstruction, projection data from an x-ray tomographic projection system are input to an iterative image reconstruction algorithm. The algorithm retrieves and utilizes a priori system information (APSI) The APSI comprises comprising point spread functions (PSFs) of all voxels in a voxelization of the field of view that are compressed in the form of vectors of parameters. For utilization, each retrieved vector of parameters is decompressed so as to generate a discretized PSF.

A method of providing an accurate three-dimensional scan of a dental arch area is disclosed. The arch area has two segments and a connecting area between the two segments. The connecting area has homogeneous features. A connecting-geometry tool with at least one definable feature is affixed to the arch area. The definable feature overlays at least part of the connecting area. The arch area is scanned to produce a scanned dataset of the arch area. The definable feature of the connecting-geometry tool on the connection area is determined based on the scanned dataset. The dimensions of the arch area are determined based on the data relating to the definable features from the scanned dataset.

A radiation imaging system operable to generate a plurality of radiation images based on different radiation energies, comprises: a communication unit configured to obtain at set communication intervals a temperature of a radiation tube by communication with a radiation generating unit; and a control unit configured to control, based on comparison of the temperature obtained at the communication intervals and a change rate of the temperature and respectively set threshold ranges, an operation for maintaining a driving state of the radiation tube or execution of image processing for obtaining a substance amount of a substance that forms an object using the plurality of radiation images.

A positioning imaging device images the subject facing a radiation detection unit to obtain a positioning image of the subject. An imaging menu selection unit selects an imaging menu corresponding to the positioning image from one or a plurality of imaging menus registered in advance in an imaging menu registration memory. A system control unit performs imaging control on a radiation source or the radiation detection unit according to the imaging menu selected by the imaging menu selection unit.

A medical image diagnosis apparatus according to an embodiment of the present disclosure includes: a gantry, one or more columns, a processing circuitry, and, and a supporting and moving mechanism. The gantry includes an imaging system related to imaging a patient. The one or more columns are each configured to support the gantry so as to be movable in a vertical direction. The processing circuitry generates an image on the basis of an output from the imaging system. The supporting and moving mechanism is configured to support the patient from underneath, while being installed so as to be movable in a direction intersecting the moving direction of the gantry. The processing circuitry controls the moving of the supporting and moving mechanism.

Evaluating dose performance of a radiographic imaging system with respect to image quality using a phantom, a channelized hotelling observer module as a model observer, and a printer, a plaque, or an electronic display includes scanning and producing images for a plurality of sections of the phantom using the radiographic imaging system, wherein the plurality of sections represent a range of patient sizes and doses and wherein the sections of the phantom contain objects of measurable detectability. Also included is analyzing the images to determine detectability results for one or more of the contained objects within the images of the plurality of sections of the phantom, wherein the analyzing includes using a channelized hotelling observer (CHO) module as a model observer; and displaying, via the printer, the plaque, or the electronic display, a continuous detectability performance measurement function using the determined detectability results.