摘要:
A method for acquiring X-ray image data of an imaging volume is disclosed, the method using a detector and a distributed X-ray source structure having a plurality of single source elements, which are uniformly distributed with a common pitch to each other, the method comprises moving the distributed X-ray source structure and/or the detector with respect to the imaging volume, importantly, the maximum moving distance dmax of the distributed X-ray source structure during the acquisition of the X-ray image data is limited to the length lp of the pitch. Emitting of X-rays from the distributed X-ray source structure and generating a plurality of signals in response to the X-rays incident upon the detector are executed during the movement.
摘要:
A power supply for generating a high output voltage for supplying an X-ray generator system with at least one X-ray source (17), especially for computer tomography (CT) applications is disclosed, wherein the high output voltage comprises at least two different high output voltage levels (U1; U1±U2) which are fast switchable so that spectral CT measurements can be conducted with one conventional X-ray tube (17). Furthermore, an X-ray tube generator system comprising such a power supply and at least one X-ray tube (17), as well as a computer tomography (CT) apparatus comprising such a power supply is disclosed.
摘要:
The invention relates to an Anti-Scatter-Grid (ASG) with lamellae (2) that absorb incident radiation (1, 8) and that produce an electrical signal proportional to the amount of absorbed radiation. The lamellae (2) may particularly consist of a semiconductor material in which photons produce electron-hole pairs that can be detected with the help of electrodes (3, 4, 6) on the sidewalls of the lamellae (2). The amount of absorbed scattered (8) or primary (1) radiation may thus be determined in a spatially resolved way, allowing to correct the image generated by an array (5) of sensor units (9).
摘要:
The invention relates to an X-ray detector with an array of pixels (10) that are composed of a scintillation layer (11), a coupling layer (12), and a sensitive layer (13). The coupling layer (12) comprises light guiding units (17) and shielding units (16), wherein the shielding units (16) are disposed above electronic processing circuits (15a, 15b) that are susceptible to disturbances by X-radiation. In an alternative embodiment, the coupling layer comprises a material like lead-glass that is transparent for light and absorbing for X-radiation. Preferably a wavelength-shifting material incorporated into the coupling layer (12) shifts the wavelength (λ1) of the photons generated in the scintillation layer (11) to values (λ2) at which the sensitive layer (13) has a higher sensitivity.
摘要:
The invention relates to an arrangement for collimating electromagnetic radiation, comprising a macrocollimator C which has at least two cutouts, and microcollimator structures which are positioned in the cutouts of the macrocollimator and have lamellae that absorb electromagnetic radiation, so that collimator channels are formed which in each case extend such that they are transparent in a transmission direction.
摘要:
For the generation of multiple-energy X-ray radiation, an X-ray tube (10) for generating multiple-energy X-ray radiation includes an anode (12) and a filter (14). At least a first (16) and a second focal spot position (18) are offset from each other in an offset direction (20) transverse to an X-ray radiation projection direction. The filter includes a first plurality (22) of first portions (24) with first filtering characteristics for X-ray radiation and a second plurality (26) of second portions (28) with second filtering characteristics for X-ray radiation. The filter is a directional filter adapted in a such a way that at least a first X-ray beam (30) emanating from the first focal spot position at least partly passes through the filter unit via the first portions, and a second X-ray beam (32) emanating from the second focal spot position passes obliquely through the first and the second portions when passing through the filter unit.
摘要:
When performing nuclear (e.g., SPECT or PET) and CT scans on a patient, an imaging system (10) includes three or more carbon nanotube x-ray sources (20) are circumferentially spaced along an arc of a rotatable gantry (16) that spans a distance larger than a maximum cross-sectional dimension of a section of a patient (14) to be imaged. The x-ray sources are sequentially pulsed to emit x-rays for scanning a section of a patient (14) including a volume of interest (VOI) (13). Only one source (20) is in an ON state at a time to create a duty cycle, which reduces cooling time for the respective sources as well as radiation dose to the subject. X-rays traversing the patient (14) are received at a flat panel x-ray detector (22) that has a width smaller than the maximum cross-sectional dimension, which further reduces the weight and size of the system (10).
摘要:
The present invention relates to X-rayimage acquisition technology in general. Employing phase-contrast imaging for X-rayimage acquisition may significantly enhance the visibility of structures in images acquired. However, phase-contrast information may only be obtainable in a small detector region with subsequent image acquisitions requiring individual phase stepping states to allow reconstruction of an X-ray image. Accordingly, a grating arrangement for phase-contrast imaging is provided which may allow on the fly phase stepping during a field of view scan. According to the present invention a grating arrangement (1) for phase-contrast imaging is provided, comprising a first grating element (8) and a second grating element (10). Each of the first grating element (8) and the second grating element (10) comprises a trench structure. The trench structure comprises at least one trench region (9) and at least one barrier region (3). The at least one trench region (9) and the at least one barrier region (3) are at least locally arranged in parallel. The first grating element (8) and the second grating element (10) are arranged such that the trench structure of the first grating element (8) and the trench structure of the second grating element (10) are non-parallel comprising an angle α.
摘要:
The invention relates to a radiation detector (10), comprising an array of pixels (1), wherein each pixel (1) comprises a conversion layer of a semiconductor material (4) for converting incident radiation into electrical signals and wherein each pixel (1) is surrounded by a trench (3) that is at least partly filled with a barrier material that absorbs at least a part of photons generated by the incident radiation. The invention also relates to a method of manufacturing such a radiation detector (10).
摘要:
The invention relates to a radiation detector (100) comprising a scintillator group with for example two scintillator elements (120a, 120b) for converting incident primary photons (X, X′) into secondary photons (λ, λ′) according to a characteristic emission spectrum. Moreover, the detector comprises at least two photodetectors (120a, 120b) for converting said secondary photons into electrical signals, wherein said photodetectors have different absorption spectra and can be read out separately. According to a preferred embodiment of the invention, the photodetectors are organic photodetectors (120a, 120b). The scintillator elements (120a, 120b) and the photodetectors are preferably arranged in a stack one behind the other. Due to the at least two photodetectors (120a, 120b), additional information about incident primary radiation (X, X′) can be collected.