摘要:
Among other things, a detector array (300) for a radiation imaging system is provided. The detector array comprises a plurality of detector elements. Respective detector elements comprise, among other things, a scintillator (304) and a photodetector (306). In some embodiments, a scintillator is shared amongst two or more of the detector elements. In some embodiments, little to no reflective material, configured to mitigate cross-talk between detector elements, is situated between two or more detector elements.
摘要:
The present specification discloses an X-ray system for processing X-ray data to determine an identity of an object under inspection. The X-ray system includes an X-ray source for transmitting X-rays, where the X-rays have a range of energies, through the object, a detector array for detecting the transmitted X-rays, where each detector outputs a signal proportional to an amount of energy deposited at the detector by a detected X-ray, and at least one processor that reconstructs an image from the signal, where each pixel within the image represents an associated mass attenuation coefficient of the object under inspection at a specific point in space and for a specific energy level, fits each of pixel to a function to determine the mass attenuation coefficient of the object under inspection at the point in space; and uses the function to determine the identity of the object under inspection.
摘要:
A method of examining a specimen using a spectroscopic apparatus, such as X-ray energy-dispersive spectroscopy, XRF or PIXE, comprising the following steps: - Providing the specimen (S) on a specimen holder (H); - Directing a focused input beam (C) of radiation onto a location P on the specimen (S), thereby producing an interaction that causes a flux of X-rays to emanate from said location; - Examining said flux using a detector arrangement (D) comprising a plurality of sub-detectors (D1, D2, D3, D4), thus accruing a measured spectrum for said location,
particularly comprising the following steps: - Choosing a set of mutually different measurement directions d = {d n } that originate from P, where n is a member of an integer sequence; - Recording an output On of said detector arrangement for different values of d n , thus compiling a measurement set M = {(On, d n )}; - Adopting a spectral model O n ' for On that is a convoluted mix of terms Band L p , where: ▪ B is a substantially continuous spectral component associated with Bremsstrahlung; ▪ L p is a substantially discrete spectral component associated with the elemental composition of the specimen at location P;
- Using computer processing apparatus to automatically deconvolve the measurement set M on the basis of said spectral model On' and distill L p therefrom.
摘要:
High-contrast, subtraction, x-ray images of an object are produced via scanned illumination by a laser-Compton x-ray source. The spectral-angle correlation of the laser-Compton scattering process and a specially designed aperture and/or detector are utilized to produce/record a narrow beam of x-rays whose spectral content consists of an on-axis region of high-energy x-rays surrounded by a region of slightly lower-energy x-rays. The end point energy of the laser-Compton source is set so that the high-energy x-ray region contains photons that are above the k-shell absorption edge (k-edge) of a specific contrast agent or specific material within the object to be imaged while the outer region consists of photons whose energy is below the k-edge of the same contrast agent or specific material. Scanning the illumination and of the object by this beam will simultaneously record and map the above edge and below k-edge absorption response of the object.
摘要:
A photon count-based radiation imaging system. The invention also relates to a method of implementing X-ray imaging in said system, and to key apparatus of said system. In the system, an x-ray source directs x-rays at a sample on a scanning platform. When the x-rays pass through said sample, photons carrying information about characteristics of the material at various spatial positions are produced. A photon count detector counts the photons on an imaging plane, obtains incident photon projection data and energy data, and transmits same to a 3D reconstruction system. The 3D reconstruction system reconstructs, on the basis of said projection data and energy data, the 3D structure and the matter composition inside the sample, then performs digital dyeing on the component parts of the sample, thereby differentiating the matter composition of the sample.
摘要:
Die vorliegende Erfindung betrifft Vorrichtungen und Verfahren zur spektrometrischen Analyse von licht-emittierenden Proben. Die Vorrichtung umfasst eine Teilchenstrahlquelle, die einen auf die Probe gerichteten Primärteilchenstrahl erzeugt, derart, dass der Primärteilchenstrahl auf der Probe auftrifft und aufgrund der Wechselwirkung zwischen Primäfleilchenstrahl und Probenmaterial Photonen aus der Probe frei gesetzt werden. Außerdem umfasst die Vorrichtung eine Vielzahl von Lichtaufnahmeelementen, die geeignet sind, die aus der Probe frei gesetzten Photonen aufzufangen, wobei die Lichtaufnahmeelemente die im jeweils zugeordneten Raumwinkelbereich emittierten Photonen auffangen. Die Vorrichtung umfasst weiterhin Leitungselemente, die ausgebildet sind, aufgefangene Photonen zu einer Auswerteeinheit weiterzuleiten, sowie ein Analysesystem, das eine Mehrzahl von Auswerteeinheiten umfasst, derart, dass von jedem Lichtaufhahmeelement aufgefangene Photonen spektral analysiert werden.
摘要:
Röntgengerät zur Untersuchung eines dreidimensionalen Untersuchungsobjekts mit ● einem Röntgendetektor, der eine Vielzahl von Detektorelementen aufweist, die jeweils zur Erfassung einer Intensität von auf das Detektorelement auftreffender Röntgenstrahlung ausgebildet sind, ● einem Röntgenoptikarray, das zwischen dem Untersuchungsobjekt und den Detektorelementen angeordnet ist und eine Vielzahl von Röntgenoptiken enthält, die so angeordnet sind, dass vom Untersuchungsobjekt auf eine der Röntgenoptiken auftreffende Röntgenstrahlung auf mehrere der Detektorelemente abgebildet wird, und ● einer Auswerteeinrichtung, die mit den Detektorelementen erfasste Intensitäten auswertet und auf dieser Grundlage für eine Vielzahl von Volumenelementen des Untersuchungsobjekts jeweils eine Intensität der von dem Volumenelement ausgehenden Röntgenstrahlung ermittelt.
摘要:
A radiation detector module (22) particularly well suited for use in computed tomography (CT) applications includes a scintillator (200), a photodetector array (202), and signal processing electronics (205). The photodetector array (202) includes a semiconductor substrate (208) having a plurality of photodetectors and metalization (210) fabricated on non-illuminated side of the substrate (208). The metalization routes electrical signals between the photodetectors and the signal processing electronics (205) and between the signal processing electronics (205) and an electrical connector (209).
摘要:
Apparatus for computed tomography is described that is also suitable for X-ray diffraction. The computed tomography measurement uses a line focus 8 and passes the X-rays from the line focus through a perpendicular slit 22 and then through a sample onto a two dimensional detector. A plurality of images are taken, each with the sample rotated about a rotation axis 14 by a different amount, and combined to create a computed tomography image.