DE4406677C2 - X-ray detector - Google Patents

X-ray detector

Info

Publication number
DE4406677C2
DE4406677C2 DE19944406677 DE4406677A DE4406677C2 DE 4406677 C2 DE4406677 C2 DE 4406677C2 DE 19944406677 DE19944406677 DE 19944406677 DE 4406677 A DE4406677 A DE 4406677A DE 4406677 C2 DE4406677 C2 DE 4406677C2
Authority
DE
Germany
Prior art keywords
shift register
detection device
shift registers
ray detection
vertical
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
DE19944406677
Other languages
German (de)
Other versions
DE4406677A1 (en
Inventor
Hartmut Dipl Ing Sklebitz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to DE19944406677 priority Critical patent/DE4406677C2/en
Publication of DE4406677A1 publication Critical patent/DE4406677A1/en
Application granted granted Critical
Publication of DE4406677C2 publication Critical patent/DE4406677C2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/50—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment specially adapted for specific body parts; specially adapted for specific clinical applications
    • A61B6/502—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment specially adapted for specific body parts; specially adapted for specific clinical applications for diagnosis of breast, i.e. mammography
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/54—Control of apparatus or devices for radiation diagnosis
    • A61B6/542—Control of apparatus or devices for radiation diagnosis involving control of exposure
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
    • G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
    • G01T1/29—Measurement performed on radiation beams, e.g. position or section of the beam; Measurement of spatial distribution of radiation
    • G01T1/2914—Measurement of spatial distribution of radiation
    • G01T1/2921—Static instruments for imaging the distribution of radioactivity in one or two dimensions; Radio-isotope cameras
    • G01T1/2928—Static instruments for imaging the distribution of radioactivity in one or two dimensions; Radio-isotope cameras using solid state detectors
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05G—X-RAY TECHNIQUE
    • H05G1/00—X-ray apparatus involving X-ray tubes; Circuits therefor
    • H05G1/08—Electrical details
    • H05G1/26—Measuring, controlling or protecting
    • H05G1/30—Controlling
    • H05G1/38—Exposure time
    • H05G1/42—Exposure time using arrangements for switching when a predetermined dose of radiation has been applied, e.g. in which the switching instant is determined by measuring the electrical energy supplied to the tube
    • H05G1/44—Exposure time using arrangements for switching when a predetermined dose of radiation has been applied, e.g. in which the switching instant is determined by measuring the electrical energy supplied to the tube in which the switching instant is determined by measuring the amount of radiation directly

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Medical Informatics (AREA)
  • Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Molecular Biology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Public Health (AREA)
  • Radiology & Medical Imaging (AREA)
  • Biomedical Technology (AREA)
  • Optics & Photonics (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • Biophysics (AREA)
  • Pathology (AREA)
  • Veterinary Medicine (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Dentistry (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Toxicology (AREA)
  • Transforming Light Signals Into Electric Signals (AREA)

Description

In DE 42 35 527 A1 ist ein Röntgenstrahlennachweisgerät beschrieben, das einen Leuchtschirm mit einem nachgeschalteten flächenhaften CCD-Detektor für die Bildinformation aufweist. Derartige CCD-Detektoren bestehen üblicherweise aus einer Vielzahl von vertikalen und mindestens einem horizontalen Schieberegister. Die Expositionssteuerung erfolgt bei dem bekannten Röntgenstrahlennachweisgerät durch einen separaten Detektor. Aus WO-63/25059 A1 ist es bekannt, das Bildsignal eines CCD- Detektors zum Einschalten einer nachgeschalteten Bildverarbeitungseinrichtung heranzuziehen.DE 42 35 527 A1 describes an X-ray detection device described that a fluorescent screen with a downstream areal CCD detector for the Has image information. Such CCD detectors exist usually from a variety of vertical and at least one horizontal shift register. The Exposure control takes place in the known X-ray detector through a separate detector. From WO-63/25059 A1 it is known that the image signal of a CCD Detector to turn on a downstream Image processing device to use.

Der Erfindung liegt die Aufgabe zugrunde, ein Röntgenstrahlennachweisgerät der eingangs genannten Art so auszubilden, daß eine automatische Belichtungssteuerung mit geringem Aufwand möglich ist.The invention is based on the object X-ray detection device of the type mentioned above  train that an automatic exposure control with little effort is possible.

Diese Aufgabe ist erfindungsgemäß gelöst durch die Merkmale des Patentanspruches 1. Bei dem Röntgenstrahlennachweisgerät gemäß der Erfindung wird das beim CCD-Detektor ohnehin vorhandene serielle Schieberegister als Belichtungssensor benutzt.According to the invention, this object is achieved by the features of claim 1. In the X-ray detection device according to the invention, this is the case with the CCD detector anyway existing serial shift register as exposure sensor used.

Die Erfindung ist nachfolgend anhand der Zeichnung näher er­ läutert. Es zeigen:The invention is based on the drawing he he purifies. Show it:

Fig. 1 ein Röntgenstrahlennachweisgerät zur Erläuterung des Erfindungsgedankens, und Fig. 1 shows an X-ray detection device to explain the inventive concept, and

Fig. 2 den CCD-Detektor bei dem Röntgenstrahlennachweisgerät gemäß Fig. 1. FIG. 2 shows the CCD detector in the X-ray detection device according to FIG. 1.

In der Fig. 1 ist eine Mamma 1 dargestellt, die durch Rönt­ genstrahlung 2 durchstrahlt wird und auf einer Platte 3 auf­ liegt. Auf einem Leuchtschirm 4 wird ein Röntgenbild erzeugt, das durch ein optisches System 5, vorzugsweise in Form eines Lichtleiterbündels, zu einem CCD-Detektor 6 geführt wird.In Fig. 1, a mom 1 is shown, which is irradiated by X-ray radiation 2 and lies on a plate 3 . An X-ray image is generated on a fluorescent screen 4 and is guided through an optical system 5 , preferably in the form of an optical fiber bundle, to a CCD detector 6 .

Die Fig. 2 zeigt den Aufbau des CCD-Detektors 6 genauer. Er ist ein oberes horizontales Schieberegister 7 und ein unte­ res horizontales Schieberegister 8 auf, sowie eine Reihe von oberen vertikalen Schieberegistern 9 und von unteren vertikalen Schieberegistern 10. Fig. 2 shows the structure of the CCD detector 6 in greater detail. It is an upper horizontal shift register 7 and a lower horizontal shift register 8 , and a series of upper vertical shift registers 9 and lower vertical shift registers 10 .

Die Ladungen der Bildpunkte, die durch Belichtung über den Leuchtschirm 4 und das optische System 5 erzeugt werden, wer­ den über die parallelen vertikalen Schieberegister 9, 10 in die seriellen, horizontalen Schieberegister 7, 8 übertragen, von wo aus der CCD-Detektor 6 über Verstarker 11, 12 ausge­ lesen wird. Die Schieberegister 7, 8 sind ebenfalls lichtemp­ findlich und sind dem Licht des Leuchtschirmes 4 ausgesetzt. Die dadurch erzeugte Ladung wird zur Expositionssteuerung be­ nutzt.The charges of the pixels, which are generated by exposure via the luminescent screen 4 and the optical system 5 , who transmitted the via the parallel vertical shift registers 9 , 10 into the serial, horizontal shift registers 7 , 8 , from where the CCD detector 6 via Amplifier 11 , 12 is read out. The shift registers 7 , 8 are also sensitive to light and are exposed to the light of the fluorescent screen 4 . The resulting charge is used to control exposure.

Zur Auskopplung des Meßsignales gibt es folgende Möglichkei­ ten:There are the following options for decoupling the measurement signal ten:

  • a) Ohne die Ladungsverschiebung der Schieberegister 9, 10 an­ zusteuern, werden die Ladungen der Schieberegister 7, 8 in üblicher Weise zum Verstärker 11, 12 (Ladungsdetektor) transportiert und in Spannungswerte transformiert. Die einzelnen Meßwerte können insgesamt, oder zu Gruppen zusammengefaßt, addiert werden. Ein vorteilhaftes Vorgehen ist es, die Be­ lichtungssteuerung nach dem kleinsten Spannungswert dieser Abtastung vorzunehmen. So wird die Belichtung des dunkel­ sten Bereiches konstant gehalten.a) Without controlling the charge shift of the shift registers 9 , 10 , the charges of the shift registers 7 , 8 are transported in the usual way to the amplifier 11 , 12 (charge detector) and transformed into voltage values. The individual measured values can be added together or combined into groups. An advantageous procedure is to perform the lighting control after the smallest voltage value of this scan. The exposure of the darkest area is kept constant.
  • b) Auch hierbei bleiben die Ladungen in den Schieberegistern 9, 10 unverändert. Die Gates der Schieberegister 7, 8 wer­ den jedoch so angesteuert, daß keine Ladungsseparation wirksam ist (z. B. alle Gates liegen auf dem normalerweise positivsten Wert der Ansteuerimpulse, z. B. +15 V). Jetzt liegt am Ausgang des Verstärkers 11, 12 unverzögert eine Spannung an, die dem Zeitwert des Integrals der Intensität der Röntgenstrahlung über dem Schieberegister 7, 8 ent­ spricht und in üblicher Weise zur Belichtungssteuerung verwendet werden kann.b) Here, too, the charges in the shift registers 9 , 10 remain unchanged. However, the gates of the shift registers 7 , 8 are driven in such a way that no charge separation is effective (e.g. all gates are at the normally most positive value of the drive pulses, e.g. +15 V). Now there is instantaneous voltage at the output of the amplifier 11 , 12 , which speaks to the time value of the integral of the intensity of the X-ray radiation via the shift register 7 , 8 and can be used in a conventional manner for exposure control.

Claims (2)

1. Röntgenstrahlennachweisgerät, bei dem einem die Röntgen­ strahlung in Licht umwandelnden Leuchtschirm (4) ein flächen­ hafter, lichtempfindlicher CCD-Detektor (6) nachgeschaltet ist, der aus einer Vielzahl vertikaler und mindestens einem horizontalen Schieberegister (7, 8, 9, 10) besteht, wobei die in den vertikalen Schieberegistern (9, 10) erzeugten Ladungen als Bildinformation dienen, während die in dem mindestens ei­ nen horizontalen Schieberegister (7, 8) erzeugten Ladungen zur Expositionssteuerung benutzt werden.1. X-ray detection device, in which a flat, light-sensitive CCD detector ( 6 ) is connected downstream of the fluorescent screen ( 4 ) converting the X-ray radiation into light, which consists of a plurality of vertical and at least one horizontal shift register ( 7 , 8 , 9 , 10 ) there, the charges generated in the vertical shift registers ( 9 , 10 ) serve as image information, while the charges generated in the at least one horizontal shift register ( 7 , 8 ) are used for exposure control. 2. Röntgenstrahlennachweisgerät nach Anspruch 1, da­ durch gekennzeichnet, daß sowohl oberhalb wie unterhalb der vertikalen Schieberegister (9, 10) je ein horizontales Schieberegister (7, 8) angeordnet ist.2. X-ray detection device according to claim 1, characterized in that a horizontal shift register ( 7 , 8 ) is arranged both above and below the vertical shift register ( 9 , 10 ).
DE19944406677 1994-03-01 1994-03-01 X-ray detector Expired - Fee Related DE4406677C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19944406677 DE4406677C2 (en) 1994-03-01 1994-03-01 X-ray detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19944406677 DE4406677C2 (en) 1994-03-01 1994-03-01 X-ray detector

Publications (2)

Publication Number Publication Date
DE4406677A1 DE4406677A1 (en) 1995-09-14
DE4406677C2 true DE4406677C2 (en) 1997-04-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
DE19944406677 Expired - Fee Related DE4406677C2 (en) 1994-03-01 1994-03-01 X-ray detector

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6198801B1 (en) 1998-02-23 2001-03-06 U.S. Philips Corporation X-ray examination apparatus including exposure control

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19536489C1 (en) * 1995-09-29 1997-04-10 Siemens Ag X=ray diagnostic device with CCD image converter
US5751783A (en) * 1996-12-20 1998-05-12 General Electric Company Detector for automatic exposure control on an x-ray imaging system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6325059A (en) * 1986-07-17 1988-02-02 Ricoh Co Ltd Thermal head driving system
DE4235527C2 (en) * 1991-10-25 1998-07-09 Morita Mfg Device for the acquisition of medical X-ray images with automatic exposure

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6198801B1 (en) 1998-02-23 2001-03-06 U.S. Philips Corporation X-ray examination apparatus including exposure control

Also Published As

Publication number Publication date
DE4406677A1 (en) 1995-09-14

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D2 Grant after examination
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