WO1992002850A1 - Procede de lecture d'informations a partir d'une feuille d'image au moyen d'un rayonnement stimulant - Google Patents

Procede de lecture d'informations a partir d'une feuille d'image au moyen d'un rayonnement stimulant Download PDF

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Publication number
WO1992002850A1
WO1992002850A1 PCT/FI1991/000231 FI9100231W WO9202850A1 WO 1992002850 A1 WO1992002850 A1 WO 1992002850A1 FI 9100231 W FI9100231 W FI 9100231W WO 9202850 A1 WO9202850 A1 WO 9202850A1
Authority
WO
WIPO (PCT)
Prior art keywords
image
stimulating
cycle
line
sheet
Prior art date
Application number
PCT/FI1991/000231
Other languages
English (en)
Inventor
Lauri Koivulehto
Original Assignee
Orion-Yhtymä Oy
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 Orion-Yhtymä Oy filed Critical Orion-Yhtymä Oy
Publication of WO1992002850A1 publication Critical patent/WO1992002850A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
    • G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
    • G01T1/16—Measuring radiation intensity
    • G01T1/20—Measuring radiation intensity with scintillation detectors
    • G01T1/2012—Measuring radiation intensity with scintillation detectors using stimulable phosphors, e.g. stimulable phosphor sheets
    • G01T1/2014—Reading out of stimulable sheets, e.g. latent image
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40—Picture signal circuits

Definitions

  • the object of the present invention is to provide a method for reading visual information stored on an image sheet t with a stimulating beam, whereby the stimulating beam is made to scan the sheet line by line and the light generated by the stimulating beam and emitting from the image sheet 10 is measured and converted into a signal which corresponds to visual information.
  • Such a method is particularly used in connection with X-ray photography for reading so-called RIM plates (radiation 15 image plates) .
  • RIM plates radiation 15 image plates
  • Such a method and device is disclosed, for instance in U.S. patent 4,527,060.
  • the reading of the RIM plate is carried out in such a way that a very small laser point is conducted on the surface
  • the laser beam is made to scan the surface of the RIM plate by using a turnable mirror
  • the mirror moves the laser point in a reciprocating movement across the RIM plate, while the plate is moved in a linear direction.
  • the luminescent substances on the RIM plate comprise an 30 after-glow property which impairs image contrasts, however, particularly with respect to the image points subsequent to the highly irradiated spots.
  • the invention is characterized by that which is disclosed in appended Claim 1.
  • An essential feature of the invention is thus that the stimulating beam, generally a laser beam, is interrupted ' at a certain frequency and the light emitting from the RIM plate is measured and analyzed in synchronization with the interrupting of the stimulating beam. The light is always measured while the laser beam is on, and also is preferably measured at least once between the image points, that is, while the laser beam is off.
  • Fig. 1 represents schematically the device for the reading of the RIM plate
  • Fig. represents the functions related to the description of the method according to the invention.
  • Reference number 1 of Fig. 1 denotes the laser source which emits laser beam L via turnable mirror 2 to RIM plate 3 which is to be read.
  • the light emitting from the surface of the RIM plate is collected by light-conducting member 5 and guided via filter 6 to light multiplier 7, from which the signal is taken to processor 8 of the system.
  • laser beam L is interrupted in the control of processor 8 at a certain frequency, for instance, approximately 1000 times per each line or the turning cycle of mirror 2.
  • Galvanometer 10 which turns mirror 2 as well as the linearly moving carrier 4 of RIM plate 3, is controlled by processor 8.
  • the digital information formed by processor 8 which corresponds to the visual information of RIM plate 3, is transferred to memory 9 where it can be further outputted in a suitable manner.
  • system can further comprise other parts, such as amplifiers, additional optical members, etc., which have been omitted from figure 1, however, since they are not essential from the point of view of the invention.
  • Point b represents the state of laser beam L; that is, the beam is switched on and off several hundred times during one line.
  • Point c represents a measured signal or a signal of light multiplier 7, when the signal is always measured once per the state of the laser beam, that is, once while the laser beam is on and once while the laser beam is off.
  • Point d represents, respectively, the signal of light multiplier 7 when two measurements are taken per each state of the laser beam.
  • the portion of after-glow in the signal coming to the light multiplier can be compensated by subtracting the portion of after-glow of the previous image points from the signal which is measured while the laser is on, the latter portion of which can in turn be determined by the signal which is measured while the laser is off. Because the after-glow is gradually attenuated, the accuracy of compensation naturally improves as the number of measurements during each state of the laser beam is increased.

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Molecular Biology (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Image Input (AREA)

Abstract

L'objet de cette invention se rapporte à un procédé servant à lire des informations sur une feuille d'image, en particulier sur une plaque RIM, au moyen d'un faisceau stimulant (L), procédé selon lequel le faisceau stimulant balaie la feuille (3) ligne par ligne, et la lumière provenant de la feuille d'image et générée par celle-ci est mesurée (5-7) puis convertie en informations visuelles. Le faisceau de balayage (L) est arrêté à une certaine fréquence et la mesure est effectuée en synchronisation avec cette opération. Tout en formant l'image qui a été lue, la partie générée par l'incandescence résiduelle du ou des point(s) d'image précédent(s) peut être prise en considération lors de la mesure de la lumière émise par un point d'image instantané, et le contraste de l'image peut ainsi être amélioré. L'arrêt du balayage peut être effectué simplement par coupure de l'alimentation en courant du laser à semi-conducteurs (1).
PCT/FI1991/000231 1990-07-30 1991-07-29 Procede de lecture d'informations a partir d'une feuille d'image au moyen d'un rayonnement stimulant WO1992002850A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI903800 1990-07-30
FI903800A FI86228C (fi) 1990-07-30 1990-07-30 Foerfarande foer avlaesning av en bildskiva innehaollande information medelst en stimulerande straole.

Publications (1)

Publication Number Publication Date
WO1992002850A1 true WO1992002850A1 (fr) 1992-02-20

Family

ID=8530861

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1991/000231 WO1992002850A1 (fr) 1990-07-30 1991-07-29 Procede de lecture d'informations a partir d'une feuille d'image au moyen d'un rayonnement stimulant

Country Status (3)

Country Link
DE (1) DE4191827T (fr)
FI (1) FI86228C (fr)
WO (1) WO1992002850A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1772751A1 (fr) 2005-10-07 2007-04-11 General Electric Company Système et procédé de balayage pour la radiographie digitale

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4484073A (en) * 1980-10-30 1984-11-20 Fuji Photo Film Co., Ltd. Method of and apparatus for reading out radiation image information
US4527060A (en) * 1981-10-16 1985-07-02 Fuji Photo Film Co., Ltd. Radiation image read-out method and apparatus
US4571493A (en) * 1983-06-16 1986-02-18 Fuji Photo Film Co., Ltd. Radiation image read-out method
US4582988A (en) * 1983-08-23 1986-04-15 Fuji Photo Film Co., Ltd. Radiation image read-out apparatus
US4767927A (en) * 1984-08-16 1988-08-30 Kabushiki Kaisha Toshiba Apparatus for reading radiation image information stored in imaging plate
US4876452A (en) * 1983-12-05 1989-10-24 Fuji Photo Film Co., Ltd. Radiation image read-out apparatus
US4916316A (en) * 1986-04-20 1990-04-10 Fuji Photo Film Co., Ltd. Radiation image recording and reproducing method

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4484073A (en) * 1980-10-30 1984-11-20 Fuji Photo Film Co., Ltd. Method of and apparatus for reading out radiation image information
US4527060A (en) * 1981-10-16 1985-07-02 Fuji Photo Film Co., Ltd. Radiation image read-out method and apparatus
US4571493A (en) * 1983-06-16 1986-02-18 Fuji Photo Film Co., Ltd. Radiation image read-out method
US4582988A (en) * 1983-08-23 1986-04-15 Fuji Photo Film Co., Ltd. Radiation image read-out apparatus
US4876452A (en) * 1983-12-05 1989-10-24 Fuji Photo Film Co., Ltd. Radiation image read-out apparatus
US4767927A (en) * 1984-08-16 1988-08-30 Kabushiki Kaisha Toshiba Apparatus for reading radiation image information stored in imaging plate
US4916316A (en) * 1986-04-20 1990-04-10 Fuji Photo Film Co., Ltd. Radiation image recording and reproducing method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1772751A1 (fr) 2005-10-07 2007-04-11 General Electric Company Système et procédé de balayage pour la radiographie digitale

Also Published As

Publication number Publication date
FI903800A0 (fi) 1990-07-30
FI903800A (fi) 1992-01-31
FI86228B (fi) 1992-04-15
FI86228C (fi) 1992-07-27
DE4191827T (fr) 1993-05-13

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