Koninklijke Philips Corporation N.V.

Simha Levene

Cornelis Reinder Ronda

Naor Wainer

Ami Altman

Amiaz Altman

Rafael Goshen

Dagobert Michel De Leeuw

Herbert J Schreinemacher

Norbert Conrads

Olga Shapiro

Rodney Arnold Mattson

Raz Carmi

Ehud Dafni

Nicolaas Johannes Anthonius Van Veen

Guenter Zeitler

Eliav Itzhak Haskal

Amir Livne

Antonius Wilhelmus Maria De Laat

Gabriel Malamud

Avner Elgali

Roman Shiriaev

Igor Uman

Gerardus Franciscus Cornelius Maria Lijten

Gerardus F C M Lijten

Guenter Zeltier

Altman Ami

Opher Zahavi

Lev Gregorian

Eliav Itshak Haskal

A host lattice modified GOS scintillating material and a method for using a host lattice modified GOS scintillating material is provided. The host lattice modified GOS scintillating material has a shorter afterglow than conventional GOS scintillating material. In addition, a radiation detector and an imaging device incorporating a host lattice modified GOS scintillating material are provided. A spectral filter may be used in conjunction with the GOS scintillating material.

Scintillating material and related spectral filter

A scintillator pack () and a CT X-ray detector array () comprising such scintillator pack () are proposed. The scintillator pack () comprises an array of scintillator pixels (). At a bottom surface () of each scintillator pixel (), an X-ray absorbing encapsulation () is provided. This encapsulation () comprises an electrically insulating highly X-ray absorbing material having an atomic number greater than 60 such as, for example, Bismuth oxide (BiO). The X-ray absorbing encapsulation () is interposed between the scintillator pixels () and an electronic circuit (). The electronic circuit () may be provided as an ASIC in CMOS technology and may therefore be sensitive to X-ray induced damage. The encapsulation () provides for good X-ray protection of such electronic circuit ().

Scintillator pack comprising an X-ray absorbing encapsulation and X-ray detector array comprising such scintillator pack

A light-reflecting material of a radiation detector, which also comprises photo-detecting elements and imaging elements adjacent to the photo-detecting elements, is provided. Typically, epoxy resin is used as the light-reflecting material. A tough, pliable resin may be used for the photo-detecting elements. This has the advantage of reducing thermal stresses inside the radiation detector, thus reducing the risk of delamination due to e.g. temperature shifts. Moreover, the tough, pliable resin preferably also has a low refractive index, which may increase the scattering co-efficient of the resin as compared to epoxy resin, which has a refractive index of 1.58. The layer thickness of a low-refractive index resin may thereby be reduced as compared to the layer thickness of epoxy resin for a given level of optical crosstalk. Preferable resins are silicon resins and resins of thermoplastic fluoropolymers.

Radiation detector comprising a light reflective material

Low cost large area photodetector arrays are provided. In a first embodiment, the photodetectors comprise an inorganic photoelectric conversion material formed in a single thick layer of material. In a second embodiment, the photodetectors comprise a lamination of several thin layers of an inorganic photoelectric conversion material, the combined thickness of which is large enough to absorb incoming x-rays with a high detector quantum efficiency. In a third embodiment, the photodetectors comprise a lamination of several layers of inorganic or organic photoelectric conversion material, wherein each layer has a composite scintillator coating.

Imaging measurement system with a printed photodetector array

A vertical radiation sensitive detector array () includes at least one detector leaf (). The detector leaf includes a scintillator array (), including, at least, a top side () which receives radiation, a bottom side () and a rear side () and a photo-sensor circuit board (), including a photo-sensitive region (), optically coupled to the rear side of the scintillator array. The detector leaf further includes processing electronics () disposed below the scintillator array, a flexible circuit board () electrically coupling the photo-sensitive region and the processing electronics, and a radiation shield () disposed below the bottom of the scintillator array, between the scintillator and the processing electronics, thereby shielding the processing electronics from residual radiation passing through the scintillator array. Some embodiments incorporate rare earth iodides such as SrI 2 (Eu).

Single or multi-energy vertical radiation sensitive detectors

An imaging system () includes a radiation sensitive detector array (). The detector array includes at least two scintillator array layers (). The detector array further includes at least two corresponding photosensor array layers (). At least one of the at least two photosensor array layers is located between the at least two scintillator array layers in a direction of incoming radiation. The at least one of the at least two photosensor array layers has a thickness that is less than thirty microns.

Multi-layer horizontal computed tomography (CT) detector array with at least one thin photosensor array layer disposed between at least two scintillator array layers

A scintillator element () comprising uncured scintillator material () is formed and optically cured to generate a cured scintillator element (). The uncured scintillator material suitably combines at least a scintillator material powder and an uncured polymeric host. In a reel to reel process, a flexible array of optical detectors is transferred from a source reel () to a take-up reel () and the uncured scintillator material () is disposed on the flexible array and optically cured during said transfer. Such detector layers () are stackable to define a multi-layer computed tomography (CT) detector array (). Detector element channels () include a preamplifier () and switching circuitry () having a first mode connecting the preamplifier with at least first detector array layers () and a second mode connecting the preamplifier with at least second detector array layers ().

CT detector including multi-layer fluorescent tape scintillator with switchable spectral sensitivity

A method includes obtaining a plurality of the two dimensional arrays of gadolinium oxysulfide. An array has wider width non-silver based spacers () that extend between rows or columns of dixels and narrower width non-silver based spacers () that extend between the other of the rows or columns of dixels. The method further includes applying a silver coating () to at least one of a top or bottom surface of the arrays. The method further includes forming a stack by stacking the silver coated arrays, one on top of another (FIG.B), with substantially equal layers of adhesive between adjacent arrays. The method further includes slicing the stack through the wider non-silver based spacers to form two dimensional arrays of scintillator dixels () having silver based spacers () along at least one direction of the array.

Method for producing a scintillator array with silver (Ag) based spacers

A system comprises a radiation source (), including a anode () and a cathode (), a high voltage generator () that generates a source voltage that is applied across the anode () and cathode (), wherein the source voltage accelerates electrons from the cathode () towards the anode (), and a modulation wave generator () that generates a modulation voltage wave having a non-zero amplitude, which is combined with and modulates the source voltage between at least two different voltages.

Voltage modulated x-ray tube

A radiation-sensitive detector () includes a scintillator array () coupled with a photosensor array () via an adhesive laminate (). The photosensor () has a plurality of dixels (). The adhesive laminate () includes a material free region that extends through the adhesive laminate () from the scintillator array () to the photosensor array () and that is located between a pair of adjacent dixels ().

Radiation detector having a split laminate optical coupling

An imaging system includes a macro organic photodiode array with rows and columns of printed photodiodes. The array may be bendable for easy manufacture and assembly on a curved support within an imaging system. Two or more layers of photodiodes may be provided for use in a spectral CT imaging system or as slices.

Imaging measurement system with a printed organic photodiode array

A host lattice modified GOS scintillating material and a method for using a host lattice modified GOS scintillating material is provided. The host lattice modified GOS scintillating material has a shorter afterglow than conventional GOS scintillating material. In addition, a radiation detector and an imaging device incorporating a host lattice modified GOS scintillating material are provided.

A radiation-sensitive detector includes a photosensor layer with one or more photosensor dixels and a composite scintillator layer with one or more scintillator dixels optically coupled to the photosensor layer. The composite scintillator layer is formed from a mixture including a scintillator material having a first refractive index corresponding to a first wavelength and a photo-resist used in micro-electromechanical systems production, having a second refractive index corresponding to the first wavelength. The first and second refractive indices are substantially matched, and the composite scintillator layer produces light having the first wavelength and that is indicative of x-radiation detected thereby.

Composite scintillator including a micro-electronics photo-resist

A radiation detector () includes a two-dimensional array of upper scintillators (&#x3c4;) which is disposed facing an x-ray source () to convert lower energy radiation events into visible light and transmit higher energy radiation. A two-dimensional array of lower scintillators () is disposed adjacent the upper scintillators (&#x3c4;) distally from the x-ray source () to convert the transmitted higher energy radiation into visible light. Upper and lower photodetectors () are optically coupled to the respective upper and lower scintillators () at an inner side () of the scintillators (). An optical element () is optically coupled with the upper scintillators (&#x3c4;) to collect and channel the light from the upper scintillators (&#x3c4;) into corresponding upper photodetectors (&#x3c4;).

Detector array for spectral CT

A radiation-sensitive detector includes a photosensor elements () and a scintillator () optically coupled to the photosensor element (). The scintillator () includes a powdered scintillator and a resin mixed with the powdered scintillator. The refractive index mismatch between the powdered scintillator and the resin is less than 7%. In one non-limiting instance, the composite scintillator material may be used to form fiber optic leaves arranged as a high-resolution detector array in conventional or spectral CT.

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D.N. Hanegev, Israel

Simha Levene