DE10137012B4 - X-ray diagnostic device with a planar solid-state X-ray image converter - Google Patents
X-ray diagnostic device with a planar solid-state X-ray image converter Download PDFInfo
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- DE10137012B4 DE10137012B4 DE2001137012 DE10137012A DE10137012B4 DE 10137012 B4 DE10137012 B4 DE 10137012B4 DE 2001137012 DE2001137012 DE 2001137012 DE 10137012 A DE10137012 A DE 10137012A DE 10137012 B4 DE10137012 B4 DE 10137012B4
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- scintillator
- absorber layer
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
- G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
- G21K1/10—Scattering devices; Absorbing devices; Ionising radiation filters
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- Spectroscopy & Molecular Physics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Measurement Of Radiation (AREA)
- Solid State Image Pick-Up Elements (AREA)
- Apparatus For Radiation Diagnosis (AREA)
Abstract
Röntgendiagnostikeinrichtung mit einer Röntgenröhre (1), einem Röntgengenerator (2), einem flächenhaften Festkörper-Röntgenbildwandler (5), der matrixförmig angeordnete Pixelelemente (12) und eine Absorberschicht (13) für Röntgenstrahlen (15) aufweist, einem Bildsystem (6) und einer Wiedergabevorrichtung (8), wobei die Absorberschicht (13) in einem lichtempfindlichen Polymer (17) eingebettete Szintillatorkörner (18) aufweist und das lichtempfindliche Polymer (17) bei Belichtung seine Leitfähigkeit ändert, dadurch gekennzeichnet, dass das Verhältnis (a/l) von mittlerem Abstand (a) zweier Szintillatorkörner (18) zu mittlerer freier Weglänge der von den Szintillatorkörnern (18) emittierten Photonen im Polymer (1) Werte zwischen 0.5 und 5 aufweist.X-ray diagnostic device comprising an X-ray tube (1), an X-ray generator (2), a planar solid-state X-ray image converter (5), the matrix-like arranged pixel elements (12) and an absorber layer (13) for X-rays (15), an image system (6) and a A reproducing apparatus (8), wherein the absorber layer (13) has scintillator grains (18) embedded in a photosensitive polymer (17), and the photosensitive polymer (17) changes its conductivity on exposure, characterized in that the ratio (a / l) of the median Distance (a) of two scintillator grains (18) to average free path of the photons emitted by the scintillator grains (18) in the polymer (1) has values between 0.5 and 5.
Description
Die Erfindung betrifft eine Röntgendiagnostikeinrichtung mit einer Röntgenröhre, einem Röntgengenerator, einem flächenhaften Festkörper-Röntgenbildwandler, der matrixförmig angeordneten Pixelelemente und eine Absorberschicht für Röntgenstrahlen aufweist, einem Bildsystem und einer Wiedergabevorrichtung, wobei die Absorberschicht in einem lichtempfindlichen Polymer eingebettete Szintillatorkörner aufweist, das bei Belichtung seine Leitfähigkeit ändert.The invention relates to an X-ray diagnostic device comprising an X-ray tube, an X-ray generator, a planar solid-state X-ray image converter having pixel elements arranged in matrix form and an X-ray absorber layer, an image system and a reproduction device, wherein the absorber layer has scintillator grains embedded in a photosensitive polymer which, on exposure, have its Conductivity changes.
In der
Es gibt Festkörper-Matrix-Röntgendetektoren, die als absorbierende Schicht amorphes Selen verwenden, wie es beispielsweise in ”Imaging Performance of a direct digital radiographic detector using selenium and a thin-film-transistor array”, D. L. Lee et al, Proceedings CAR '96, Elsevier 1996, Seite 41 bis 46, beschrieben ist.There are solid-state matrix X-ray detectors using amorphous selenium as the absorbing layer, as described, for example, in "Imaging Performance of a Direct Digital Radiographic Detector Using Selenium and a Thin Film Transistor Array", DL Lee et al, Proceedings CAR '96 Elsevier 1996, pages 41 to 46.
In der
Ein Problem liegt darin, dass das für die Absorberschicht
Aus der
In der
Aus der
Die Erfindung geht von der Aufgabe aus, eine Röntgendiagnostikeinrichtung der eingangs genannten Art derart auszubilden, dass die Absorberschicht einen hohen Wirkungsgrad aufweist und leicht herzustellen ist.The invention is based on the object, an X-ray diagnostic device of the type mentioned in such a way that the absorber layer has a high efficiency and is easy to manufacture.
Die Aufgabe wird erfindungsgemäß dadurch gelöst, dass das Verhältnis von mittlerem Abstand zweier Szintillatorkörner zu mittlerer freier Weglänge der von den Szintillatorkörnern emittierten Photonen im Polymer Werte zwischen 0.5 und 5 aufweist. Dadurch erhält man einen Komposit-Absorberkörper, der in ausreichenden Stärken herstellbar ist und dass sich die Absorptionsfähigkeit der Absorberschicht noch weiter erhöht.The object is achieved according to the invention in that the ratio of the average distance between two scintillator grains to the mean free path length of the photons emitted by the scintillator grains in the polymer has values between 0.5 and 5. This results in a composite absorber body which can be produced in sufficient thicknesses and that the absorption capacity of the absorber layer increases even further.
Es hat sich als vorteilhaft erwiesen, wenn die Szintillatorkörner aus Gadoliniumoxisulfid (Gd2O2S) bestehen, das mit Praseodym (Pr) dotiert sein kann.It has proven advantageous if the scintillator grains consist of gadolinium oxysulfide (Gd 2 O 2 S) which may be doped with praseodymium (Pr).
In vorteilhafter Weise kann der flächenhafte Festkörper-Röntgenbildwandler als Träger ein Glassubstrat aufweisen, auf das die matrixförmig angeordneten Pixelelemente abgeschieden sind, und auf die Pixelelemente eine Absorberschicht aufgetragen sein, die von einer gemeinsame Gegenelektrode abgedeckt ist. Aufgrund der Veränderung der Leitfähigkeit sowohl des lichtempfindlichen Polymer als auch des eingebetteten Szintillators wird die Effektivität der Strahlenumwandlung erhöht.The areal solid-state X-ray image converter can advantageously have as a carrier a glass substrate onto which the pixel elements arranged in the form of a matrix are deposited, and onto the pixel elements an absorber layer which is covered by a common counterelectrode. Due to the change in conductivity of both the photosensitive polymer and the embedded scintillator, the efficiency of beam conversion is increased.
Erfindungsgemäß besteht jedes Pixelelement aus einer obenliegenden Elektrode, einem Speicherkondensator und einem TFT-Schalter.According to the invention, each pixel element consists of an overhead electrode, a storage capacitor and a TFT switch.
Die Erfindung ist nachfolgend anhand von in der Zeichnung dargestellten Ausführungsbeispielen näher erläutert. Es zeigen:The invention is explained in more detail with reference to embodiments shown in the drawing. Show it:
Inder
Die Szintillatorkörner können besonders vorteilhaft aus mit Praseodym dotierten Gadoliniumoxisulfid (GdO2S:Pr) bestehen. Dieses Material hat eine sehr gute Absorptionsfähigkeit, eine hohe Lichtausbeute und ein sehr gutes zeitliches Signalverhalten und wird beispielsweise als keramisches Material in Kombination mit kristallinen Silizium-Photodioden in der Röntgencomputertomographie verwendet.The scintillator grains can particularly advantageously consist of praseodymium-doped gadolinium oxysulfide (GdO 2 S: Pr). This material has a very good absorption capacity, a high luminous efficacy and a very good temporal signal behavior and is used, for example, as a ceramic material in combination with crystalline silicon photodiodes in X-ray computer tomography.
Das Polymer ist derart hergestellt, dass sich die elektrische Leitfähigkeit ändert, wenn das Licht aus dem Szintillator auftrifft. Die Leitfähigkeit nimmt mit zunehmender Intensität zu.The polymer is made such that the electrical conductivity changes as the light from the scintillator impinges. The conductivity increases with increasing intensity.
Das Polymer-Szintillator-Gemisch kann relativ leicht in einem großen Dickenbereich auf die Matrix aus amorphem Silizium aufgebracht werden.The polymer scintillator mixture can be relatively easily applied to the amorphous silicon matrix in a wide range of thicknesses.
In der
Analog zu den Festkörpermatrix-Röntgendetektoren, die die Leitfähigkeitsänderung im amorphen Selen nutzen, hat eine lokale Erhöhung der Leitfähigkeit im Polymer-Bereich
Der mittlere Abstand zweier Szintillatorkörner
Besonders vorteilhaft ist, für das Verhältnis a/l Werte zwischen 0.5 und 5 zu wählen.It is particularly advantageous to choose values between 0.5 and 5 for the ratio a / l.
Der Bereich a/l >> 1 ist ungeeignet, da das Polymer
Im Bereich a/l << 1 ist die Ortsauflösung extrem verschlechtert, da die Leitfähigkeitserhöhung nicht nur in der Nähe der absorbierten Röntgenstrahlen
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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DE2001137012 DE10137012B4 (en) | 2001-07-31 | 2001-07-31 | X-ray diagnostic device with a planar solid-state X-ray image converter |
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DE2001137012 DE10137012B4 (en) | 2001-07-31 | 2001-07-31 | X-ray diagnostic device with a planar solid-state X-ray image converter |
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DE10137012A1 DE10137012A1 (en) | 2003-02-27 |
DE10137012B4 true DE10137012B4 (en) | 2011-03-17 |
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DE2001137012 Expired - Fee Related DE10137012B4 (en) | 2001-07-31 | 2001-07-31 | X-ray diagnostic device with a planar solid-state X-ray image converter |
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Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI461725B (en) | 2011-08-02 | 2014-11-21 | Vieworks Co Ltd | Radiation imaging system |
DE102013200881A1 (en) | 2013-01-21 | 2014-07-24 | Siemens Aktiengesellschaft | Producing nanoparticulate scintillators, comprises providing dispersion comprising activator particles with activator substance, growing host material on particles, and carrying out temperature treatment of formed scintillator particles |
DE102014212424A1 (en) | 2013-12-18 | 2015-06-18 | Siemens Aktiengesellschaft | Scintillators with organic photodetection dish |
DE102013226365A1 (en) * | 2013-12-18 | 2015-06-18 | Siemens Aktiengesellschaft | Hybrid organic X-ray detector with conductive channels |
DE102014225541A1 (en) | 2014-12-11 | 2016-06-16 | Siemens Healthcare Gmbh | Detection layer comprising perovskite crystals |
DE102014225543B4 (en) | 2014-12-11 | 2021-02-25 | Siemens Healthcare Gmbh | Perovskite particles with a coating of a semiconductor material, method for their production, detector comprising coated particles, method for producing a detector and method for producing a layer comprising coated particles |
DE102015225134A1 (en) | 2015-12-14 | 2017-06-14 | Siemens Healthcare Gmbh | Hybrid X-ray detectors realized by soft sintering of two or more mixed powders |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0291299B1 (en) * | 1987-05-11 | 1993-02-24 | General Electric Company | Digital radiographic imaging system and method therefor |
DE69514495T2 (en) * | 1994-08-11 | 2000-08-10 | Koninkl Philips Electronics Nv | SOLID STATE IMAGE AMPLIFIER AND X-RAY EXAMINER WITH A SOLID STATE IMAGE AMPLIFIER |
DE19506368C2 (en) * | 1994-02-25 | 2001-03-01 | Toshiba Kawasaki Kk | Scintillator and method for its manufacture, as well as X-ray detector and X-ray computed tomography scanner |
-
2001
- 2001-07-31 DE DE2001137012 patent/DE10137012B4/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0291299B1 (en) * | 1987-05-11 | 1993-02-24 | General Electric Company | Digital radiographic imaging system and method therefor |
DE19506368C2 (en) * | 1994-02-25 | 2001-03-01 | Toshiba Kawasaki Kk | Scintillator and method for its manufacture, as well as X-ray detector and X-ray computed tomography scanner |
DE69514495T2 (en) * | 1994-08-11 | 2000-08-10 | Koninkl Philips Electronics Nv | SOLID STATE IMAGE AMPLIFIER AND X-RAY EXAMINER WITH A SOLID STATE IMAGE AMPLIFIER |
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Owner name: SIEMENS HEALTHCARE GMBH, DE Free format text: FORMER OWNER: SIEMENS AKTIENGESELLSCHAFT, 80333 MUENCHEN, DE |
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