WO2011082738A1 - Cassette pour un écran photostimulable, écran photostimulable pour une telle cassette, appareil pour la lecture d'un écran photostimulable, appareil d'examen doté d'une telle cassette et procédé d'enregistrement d'images panographiques - Google Patents

Cassette pour un écran photostimulable, écran photostimulable pour une telle cassette, appareil pour la lecture d'un écran photostimulable, appareil d'examen doté d'une telle cassette et procédé d'enregistrement d'images panographiques Download PDF

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Publication number
WO2011082738A1
WO2011082738A1 PCT/EP2010/007206 EP2010007206W WO2011082738A1 WO 2011082738 A1 WO2011082738 A1 WO 2011082738A1 EP 2010007206 W EP2010007206 W EP 2010007206W WO 2011082738 A1 WO2011082738 A1 WO 2011082738A1
Authority
WO
WIPO (PCT)
Prior art keywords
cassette
cassette according
storage film
piece
ray source
Prior art date
Application number
PCT/EP2010/007206
Other languages
German (de)
English (en)
Inventor
Michael Thoms
Original Assignee
DüRR DENTAL 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 DüRR DENTAL AG filed Critical DüRR DENTAL AG
Publication of WO2011082738A1 publication Critical patent/WO2011082738A1/fr

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Classifications

    • A61B6/512—
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/42—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for detecting radiation specially adapted for radiation diagnosis
    • A61B6/4208—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for detecting radiation specially adapted for radiation diagnosis characterised by using a particular type of detector
    • A61B6/4216—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for detecting radiation specially adapted for radiation diagnosis characterised by using a particular type of detector using storage phosphor screens
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B42/00—Obtaining records using waves other than optical waves; Visualisation of such records by using optical means
    • G03B42/02—Obtaining records using waves other than optical waves; Visualisation of such records by using optical means using X-rays
    • G03B42/025—Positioning or masking the X-ray film cartridge in the radiographic apparatus
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B42/00—Obtaining records using waves other than optical waves; Visualisation of such records by using optical means
    • G03B42/02—Obtaining records using waves other than optical waves; Visualisation of such records by using optical means using X-rays
    • G03B42/04—Holders for X-ray films
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B42/00—Obtaining records using waves other than optical waves; Visualisation of such records by using optical means
    • G03B42/02—Obtaining records using waves other than optical waves; Visualisation of such records by using optical means using X-rays
    • G03B42/04—Holders for X-ray films
    • G03B42/042—Holders for X-ray films for dental applications
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B42/00—Obtaining records using waves other than optical waves; Visualisation of such records by using optical means
    • G03B42/08—Visualisation of records by optical means
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/58—Testing, adjusting or calibrating apparatus or devices for radiation diagnosis
    • A61B6/582—Calibration
    • A61B6/583—Calibration using calibration phantoms

Definitions

  • the invention relates to a cassette for a storage film, a storage film for use in such a cassette, a device for reading such a storage film and an examination device which operates with such a cassette and a storage film.
  • Radiographs made namely intraoral images and panoramic images.
  • the exposure of the image carrier (classic X-ray film or storage film) is carried out through the skull, whereby it is ensured by the imaging geometry that only the areas of interest of the skull,
  • a general disadvantage of the panography method is that the image is heavily distorted due to the use of a point light source, so that the assessment of the
  • Sheet material was sharper as long as magnification factors below 1.5 were used.
  • x-ray sources that can be inserted into the mouth have been developed that can be used in the range between 50 and 70 kV with currents of 0.1 mA and smaller.
  • the burden on the skin can now be kept smaller.
  • the focal spot is less than 0.1 mm.
  • Typical exposure times are between 0.1 and 5 sec. This ultimately allows a resolution of 5 line pairs per mm, with which caries is detectable by Rötgenuntersuchung.
  • the present invention seeks to provide a cassette which allows for the easy use of exposable pieces of material for the purposes of panography, in such a way that the exposable piece of material is curved approximately in accordance with the course of the jaw.
  • the invention is also intended to be a storage film
  • Such cassette is particularly suitable.
  • Cassette invention are used, can be read.
  • the invention is also intended to specify a panography examination device.
  • the support part remains after adaptation deformation in the respectively selected geometry.
  • the support member can be repeatedly adapted to different jaw shapes.
  • a support member according to claim 6 is characterized by a particularly long life.
  • a certain elastic bias of the holding part results already from the fact that the exposable material pieces used in the holding part have their own elastic flexibility, which may well be significant, especially if one places a plurality of such exposable material pieces one behind the other.
  • a strut-locking device In a strut-locking device according to claim 8, one can bring about the locking in a simple manner. It only needs a single clamping handle to be operated.
  • the respectively set geometry of the support member can be easily characterized by a few numbers. These can be z. B. are entered into a computer to inform them about the respectively set shape of the support member.
  • the development of the invention according to claim 10 makes it possible to easily take into account the fact that jaws typically have a more curved front portion and a less curved lateral portion. This results automatically by the different bendability of the various sections of the support member that they are deformed differently when exercising a force acting on them alike. In this case, in a cassette according to claim 11, a continuous change in the curvature of the support member is obtained.
  • the actual support part can be designed as a plate of constant thickness and the different bendability of the different plate sections obtained by placing on the plate a reinforcing rib whose cross section changes.
  • the development of the invention according to claim 13 is in view of a simple releasable connection between
  • the retaining strip can be twisted under elastic deformation so that the exposable piece of material is released from it.
  • the retaining strip may additionally comprise pivotable retaining lugs, which are movable against spring force in a position releasing the storage film.
  • the development of the invention according to claim 19 is advantageous in terms of making the support member as a cheap wearing part, possibly also as a disposable item.
  • the further development of the invention according to claim 20 makes it possible to insert the tube-shaped part of an intraorally positionable X-ray source containing the anticathode through the support part. In this way, the carrying part, the exposable piece of material carried by it and the X-ray source become one unit connected .
  • a hygiene part is connected to the protective cover of the cassette, which surrounds the intraoral positionable housing part of the X-ray source, when the unit formed by this housing part and the cassette is positioned on the patient's jaw.
  • Calculator can be retrieved based on the identification to make correction calculations, evaluations and presentation implementations on the captured image.
  • the development of the invention according to claim 26 equips it to expose different pieces of material at the same time. In this case, it is then possible to use pieces of material of different resolution and / or sensitivity and thus to produce panorama images with a single exposure, which are adapted to different circumstances of the structure to be examined.
  • a storage film according to claim 28 is used in conjunction with a cassette according to the invention, then the intraorally positionable tubular portion of the x-ray source can simply be inserted through the storage film.
  • a device in a device according to claim 33 one can visually evaluate the respective curvature of the support member in a simple manner.
  • the recording of the shape of the support member by a camera is preferably carried out after reading the exposable piece of material or after its removal.
  • the shape of the supporting part can be removed after removing the
  • Claim 33 specified, particularly advantageous because their image can be evaluated very easily on curved structures.
  • a device according to claim 38 is also characterized easy handling. There are no significant mechanical adjustments to make.
  • a device according to claim 40 also makes it possible to adapt a material piece, which is better adapted to the course of a jaw in its geometry than partially cylindrical geometry, with largely the same read-out conditions for the different pixels of the jaw Material - read piece. Thus one obtains in a simple way a successive structure of the different image lines or image columns.
  • An apparatus makes it possible to record a structure to be examined at different levels and under different projection conditions. The respective conditions are determined by the
  • the preferred device according to claim 44 makes it possible to apply only parts of the rear half-space with X-rays in which a recording is desired.
  • Position and different angular position can be applied to the each with X-rays
  • the photosensitive material piece may always be in the
  • a transport device can be provided according to claim 47 which brings the cassette from the receiving position to the scanning unit in a defined manner.
  • a transport direction may include, for example, a linearly movable carriage or a pivoting linkage arrangement.
  • the method given in claim 48 makes it possible to produce panographic images corresponding to different layers of the structure to be examined.
  • Figure 1 is a partially sectioned plan view of a
  • Panography examination device with an intraoral positionable X-ray source and a cartridge for storage foils
  • Figure 2 is a plan view of the unit shown in Figure 1 from the patient side;
  • Figure 3 is an enlarged plan view of a section of a retaining strip, which is part of a storage film support member of the examination apparatus of Figure 1;
  • FIG. 4 is a plan view of a modified embodiment of a storage film support member together with an intraorally positionable X-ray source;
  • FIG. 5 shows a schematic block diagram of a device for reading out a panographic imaging film and for processing the read-out image as a function of the geometry of the imaging film;
  • Figure 6 is a schematic plan view of a device for
  • Figure 7 is a side view of a tubular end portion of an intraorally positionable X-ray source with an attached Blendenkap e;
  • Figure 8 is a plan view of a modified storage film for use in panography
  • Figure 9 is a plan view of a further modified Panoramic imaging film consisting of two flush parts
  • Figure 10 is a view similar to Figure 9, in which
  • Figure 11 is a side, partially vertically cut
  • Figure 12 is a Schamtician representation, based on which
  • a panography examination unit is denoted overall by 10. It comprises an X-ray source 12 and a cassette unit 14, which is detachably mounted on the X-ray source 12.
  • the X-ray source comprises a housing 16 with a rear cuboid housing section 18 and a slender tubular front housing section 20.
  • a rear housing section 20 is an electron gun
  • Antikathode 28 hits. When braking the electron beam 26 on and in the Antikathode creates a
  • Roentgen radiation as indicated schematically at 30. This is discharged into the rear half space of the Antikathode 28.
  • the material from which the housing section 20 originates. is transparent to X-rays, opaque to visible light, eg a metal with a low atomic number.
  • a voltage supply for the X-ray source 12 is indicated.
  • the cassette unit 14 comprises a hub part 34, to which a support plate 36 is laterally and upwardly and downwardly formed.
  • the support plate 36 is in settlement recheckig and the hub portion 34 is located at the center of the rectangle.
  • the support plate 36 in the unloaded state has the apparent form of Figure 1 shape that comes close to the shape of a human jaw.
  • the support plate 36 is provided with a support rail 38 and 40, respectively, which has a rectangular U-shaped cross-section, as shown in FIG.
  • the retaining rails 38 and 40 each have a base portion 42 which is perpendicular to the main surface of the support plate 36, and a front leg 44 which tapers to the horizontal center plane of the cartridge unit 14 under bedin- conditions. This center plane corresponds to the plane of the drawing of FIG. 1.
  • the distance of the leg 44 from the front of the support plate 36, so the width of the base portion 42 is selected so that three memory foils 46, 48, 50 lying behind each other with their upper and lower ends in the support rails 38, 40 recording.
  • the imaging plates 46, 48, 50 may be in their
  • the storage foils 46, 48 and 50 can also be identical. One then uses the images held in these memory films 46, 48, 50 to compose them pixel by pixel to form an overall image
  • the base portion 42 may be smaller or larger, to accommodate fewer or more memory sheets and possibly also absorber sheets.
  • the storage foils 46, 48, 50 each have a central opening 52 which can receive the hub part 34.
  • the base sections 42 and the legs 44 are provided with wedge-shaped recesses
  • the support plate 36 and the support rails 38, 40 are injection-molded from an elastically deformable plastic material, so that the upper edges of the retaining lugs 58 can be pressed under the upper or lower edge of a storage film 46, 48, 50 in order to remove or insert a storage film ,
  • the cartridge unit 14 further comprises a protective cover, generally designated 60, which is replaced by a back cover. wall 62 and a front wall 64 is formed. Rear wall and front wall are made of a pigmented plastic material, so that the protective cover 60 is sealed against visible light.
  • Front wall 64 in the region of reduced diameter portions 66, 68 of the hub portion 34 cylindrical protuberances 70, 72 which are press-fitted on the reduced diameter portions 66, 68 are placed. Alternatively, they can also be welded or glued there.
  • the Aufbeissplatten 82, 84 may be provided on its top and / or bottom with visual and / or tactile perceptible markings 85-1, 85-2, etc. In this way it is possible in a patient who
  • X-ray source 12 to be arranged in different precisely predetermined positions inside the mouth of a patient and set the same relative position between the X-ray source and jaw in different patients. For each of these positions one obtains in the first case an image with slightly different projection conditions, in particular different magnifications. From different such Pictures can then be computationally create layer images. In the second case, one has the same projection geometry in different patients.
  • the tubular housing section 20 of the X-ray source 12 is surrounded by a cylindrical hygienic part 86 which is closed at the free end and which can likewise be pressed onto the hub section 68, shrunk, glued or welded on.
  • the examination unit 10 formed by the X-ray source 12 and the cassette unit 14 is enveloped in a light-tight and fluid-tight manner.
  • a metal rail 88 may be placed, which is made of a metal which can be plastically deformed several times without breaking.
  • the support plate 36 which is already adapted from home to an average jaw, the respective requirements of an individual jaw bill bearing so bent that the support plate 36 and thus also held by her memory sheets 46, 48, 50 parallel to the jaw outside ,
  • FIG. 4 shows an alternative possibility of adjusting the geometry of the support plate 36.
  • Components of the examination unit 10 which are not necessary for understanding the adjustment of the geometry of the support plate 36 are omitted in FIG. It is also shown only half of the cassette unit, the other is mirror-perfect.
  • Support plate 36 patch stiffening rib 90 whose Cross-section increases with increasing portion of the axis of the X-ray source 12.
  • the increase in cross-section is chosen so that it takes place in the direction perpendicular to the main surface of the support plate 36 direction.
  • an increase in cross-section in the direction perpendicular to the plane of the drawing of FIG. 4 may also be provided.
  • the stiffening rib 90 is spaced at two
  • Make bearing openings 92, 94 each of which can receive a pivot pin 96 and 98, which is supported by the end of an actuating rod 100 and 102, respectively.
  • Control rod 100 passes through a tendon guide 104, which is provided in a bearing block 108.
  • the bearing block 108 is slidably mounted on a support plate 110 which is mechanically fixed to the hub part 34 (here via the housing of the X-ray source 12).
  • the bearing block 108 is slotted in its portion located above the support plate 110 in FIG. 4 and thus has two clamping plates, one of which is shown at 112.
  • a threaded bore 114 is provided, while the upper clamping plate, not shown, has a through hole, which is aligned with the threaded bore 114.
  • the two clamping plates can be adjusted in their distance by a screw and the adjusting rod 104, which preferably has a rectangular cross-section, clamp between them.
  • the control rod 102 is guided in a bearing block 116 which rotatably via stub shafts 118 in a
  • Carriage 120 is mounted, which is displaceable on the support plate 110.
  • the bearing block 116 is again slotted in order to position the actuating rod 102 in the respective locked position to be able to lock.
  • the adjusting rods 100, 102 each carry a scale 122, which is read on the end face of the associated bearing block 108 or 116.
  • the course of the support plate 36 can be adjusted upon release of the adjusting rods 100, 102 and then fixed in its form by the clamping devices of the two bearing blocks are tightened.
  • the cross-sectional profile of the reinforcing rib 90 can be used to specify how much the support plate 36 can be adjusted in different areas.
  • FIG. 5 schematically shows a scanner 124 which can read out the storage foils 46, 48, 50 one after the other.
  • Image plates comprise a photosensitive layer containing, dispersed in a matrix, phosphor particles provided with color centers. At finished color centers there are local electronic excitation levels that can be activated by X-rays and have long lifetimes ranging from 15 minutes to one hour. If excited such color centers are irradiated with a laser beam which is red in practice, the color centers are raised to a higher excited state and relax therefrom, emitting blue fluorescent light. By photoelectrically registering the fluorescent light of each pixel of the storage film It is thus possible to convert the latent image of the investigation project generated by the X-rays into an electrical image which can be digitally processed and converted. Such conversion allows, in particular, the conversion of the less familiar panography representation into a panorama representation.
  • a deflection prism 136 which deflects the laser beam 128 into a transverse read-out plane, in which it then rotates in accordance with the position of the deflection prism 136, runs around this axis.
  • the memory film 46, 48 or 50 to be read is placed on a transparent cylinder 138 and moved on it by three drive belts 140, 142, 144 in the axial direction.
  • the drive belts 140, 142, 144 are mechanically coupled as indicated by dashed lines and are driven by a stepper motor 146 which cooperates with a rotary encoder 148.
  • Diameter-comprising photo multiplier 156 which is surrounded by an annular mirror 158. Above the
  • Drawing plane of Figure 5 is to think another mirror, which also fills the clear cross-section of the cylinder 138.
  • the output of photomultiplier 156 is applied via an amplifier 160 to an input of a process computer 162 given.
  • the process computer 162 receives at another input the signal of the rotary encoder 148 and the signal of a further rotary encoder 164 which is coupled to an electric motor 166 which rotates the deflection prism 136 at high frequency.
  • the process computer 162 also controls the stepper motor 146 and the electric motor 166.
  • process computer 162 controls an electro-optic shutter 168 to rapidly turn on and off the light emitted by the laser 126, as described in greater detail below.
  • a camera 170 is provided to detect the respectively set geometry of the support plate 36 and to report it to the process computer 162.
  • a mark reader 172 serves to read a mark 174 characterizing the cassette unit 14. Under an identifier which corresponds to the bar code of the mark 174, data are stored in the process computer 162 which indicate the number and type of the imaging plates used. If attenuator sheets lying between the storage foils are used during recording, the corresponding data are likewise stored under the identifier corresponding to the mark.
  • the process computer 162 On the output side, the process computer 162 is connected in a controlled manner to a high-voltage device 176, which provides the operating voltage necessary for driving the photomultiplier 156. To enter data, the process computer 162 is connected to a keypad 178.
  • An output of data and the output of control messages is possible via a monitor 180 connected to the process computer 162.
  • the process computer 162 is connected to a mass storage 182, and a printer 184 can be used to output images, record logs, and so on.
  • the shape of the memory film to be read out is adapted to the shape of the transparent cylinder 138.
  • the laser beam 128 thus impinges on all pixels vertically, and the geometric ratios of the readout are constant across the image.
  • FIG. 6 shows a corresponding read-out device.
  • FIG. 6 shows a storage foil 46 which permanent or by placement on a support plate
  • a first part-cylindrical surface extends over an angular range Wl, which is symmetrical to the longitudinal center plane of the storage film 46.
  • Angle range W2 follows the end of the angular range W1 on the right in the drawing
  • a third angle range W3 is provided which extends from the left-hand end of the angular range W1 in the drawing to the free end on the left
  • Memory sheet 46 extends:
  • the angular ranges W1, W2 and W3 correspond to bending axes 134-1, 134-2, 143-3.
  • a deflecting prism 136 - 1, 136 - 2 and 136 - 3 is now provided on each of these axes of curvature, which directs a laser beam 128 - 1, 128 - 2 and 128 - 3 essentially perpendicular to the associated subregion of the storage film 146.
  • the laser beams 128-1, 128-2 and 128-3 are generated by lasers 126-1, 126-2 and 126-3 and mirrored 130-1, 130-2 and 130-3 and 132-1, 132-2 and 132-3 to the respective axle.
  • the electric motors 166-1, 166-2 and 166-3 are specially synchronized with each other. Roughly speaking, the product of the angular velocity of the deflection prism and the distance of the prism axis from the associated region of the storage film is constant. This means that the laser beams 128-1, 128-2 and 128-3
  • the laser beam 128-3 is initially activated for scanning a line of the storage film 46
  • the laser beam 128-1 As soon as the laser beam 128-1 subsequently reaches the left end of the angular range W1, which is detected from the output signal of the resolver 164-1, the laser beam 128-1 becomes active by opening its electronic shutter 268-1 and scans the angular range W1 from left to the right end. Then, the laser beam 128-1 is turned off by closing its shutter 168-1. As soon as the deflecting prism 130-2 reaches the position in which the laser beam 128-2 lies at the upper end of the angle range 2 in the drawing, the electronic shutter 168-2 is opened and the remaining part of the scanning line is deflected by the laser beam 128-2 - drive.
  • the storage film 46 is read out under substantially constant conditions, both as regards the angle of incidence and as regards the dose of read-out light.
  • Process computer 152 are connected. The outputs of the three photomultipliers 156 are summed. The photomultipliers 156 are embedded in a mirror plate 158, and this again faces (against the drawing plane of Figure 6) a fully mirrored plate.
  • three scan heads synchronized by the process computer 162 are used, each comprising a laser and a deflection prism.
  • a single scan head which is successively placed on the three axes of curvature 134-1, 134-2 and 134-3. For this you can see the parts of the
  • a shielding sleeve can be placed on the intraorally positionable tubular housing section 20 of the X-ray source
  • the shielding sleeve 192 By the axial extent of which one can vary the opening angle of the X-ray beam generated in the back space. If one provides the shielding sleeve 192 with a cutout 194, one can additionally X-ray certain lateral sections of the mandibular arch.
  • the storage foils 46, 46, 50 were first inserted into the cassette unit 14, with the openings 52 provided in them being pushed axially over the hub portion 34 and, if necessary, the picking plates 82, 84. This pushing is done in the axial direction of the housing portion 20 until the memory foils 46, 46, 50 with elastic deformation of the retaining lugs 58 finally lent in the support rails 38, 40 engage.
  • the storage film 46, 46, 50 can be inserted from the side into the cassette unit 40.
  • a slot-shaped opening 52 can be provided in the storage film for its one edge.
  • no X-ray image can then be taken in the region of the opening 52, which is acceptable for many applications, since the hub part 34 in any case spaces the teeth of the lower jaw and the upper jaw.
  • FIG. 10 likewise shows a storage film 46
  • the slot 52 is significantly shorter, and it uses two 180 ° against each other twisted Speicherfo- lien to provide a continuous photosensitive surface, which has a receiving opening 52 for the
  • Hub part 34 of the X-ray source 12 contains.
  • the segments 46 and 48 can after a horizontal
  • a scanner Separate then spatially separated a scanner be retracted to read the images held by them. These are then assembled electronically bumpless later. If you use a scanner according to DE 199 42 211 AI this purpose be mounted on a vertically movable table with two movable in the circumferential direction of the cylinder Aufläge vom, which then the film segments in the predetermined Abastgeometrie on a
  • the cassette specifies a (partially) cylindrical shape of the storage film.
  • the imaging plates can thus be read in their exposure geometry with a normal scanner having a cylindrical film support.
  • a representation conversion into the panographic representation or a panoramic representation taking into account the otherwise determined jaw geometry can be carried out mathematically by means of point coordinate transformation.
  • the corresponding transformation data may be e.g. be determined experimentally on a phantom head.
  • An X-ray source with mouth-insertable, slim housing portion 20 may also be used for normal intra-oral recordings.
  • a tube is then placed on the housing section 20, from which the x-ray beam exits laterally in a collimated manner. Due to the small diameter of the housing portion 20, it is possible to place the X-ray source up to 7 times closer to the jaw than a conventional X-ray source for intraoral recordings. As described above, unnecessary parts of the X-ray light can be masked out by an absorbent cap with a correspondingly designed window.
  • a light-tight protection vorzehen cover instead of a light-tight protective cover 60 for the cassette, a light-tight protection vorzehen cover. This can also comprise at the edge of the opening 52 welded film layers. For many applications, however, is the penetration of a smaller amount
  • the examination device described above makes it possible to produce x-ray images of good quality with low radiation exposure of the patient from extended areas of the jaw, and in a cost-effective manner, since the examination device, unlike a panoramic device, does not require complex and precise guidance mechanics.
  • an examination device for producing panographic images of the pines of a patient is designated as a whole by 200.
  • the recording part 202 consists of a generally designated 202 recording part and a total of 204 designated reading part.
  • the recording part 202 has substantially the same structure as that for the embodiments of FIGS.
  • the support plate 36 which carries a storage film 46, but is now rigid and exactly part-cylindrical. It surrounds the face of a patient 206
  • the support plate 36 has four eyes, two of which are shown at 208 and 210 in Figure 11. Of these, 208 and 210 threaded sleeves are used in the eyes, which work together with a threaded spindle 216. The latter is driven by a (electric) motor 146 with resolver 148, which is supported by a base plate 220 of the examination device.
  • the two bearing eyes to be considered in front of the drawing plane of FIG.
  • Sliding bushing provided and run on a front of the plane to thinking guide rod, which is arranged similar to the threaded spindle 216, but has no thread.
  • the read-out part 204 is constructed similarly as shown in FIG. Since the read-out part 204 according to FIG. 11 is intended only for reading out a storage film 46 which extends over an angle of approximately 180 °, the circumferential extension of the housing 138 also needs to be only 180 °. Accordingly, the axis 134, on which the deflecting prism 136 (shown simply as a deflection mirror) rotates, moved to the edge of the housing. In the peripheral wall of the housing 138 is a narrow read-out slot 222, which is provided on the inside with bevels 224, 266.
  • the entire interior of the housing 138 is provided with a
  • Layer 228 occupies which laser light is absorbed and Fluorescence light, which is triggered by the laser light in the storage film 46, reflected. In this way, the fluorescent light enters the photomultiplier 156 directly or via one or more reflections.
  • the support plate 136 To read the memory sheet 46 only by energizing the electric motor 146, the support plate 136 must be moved quickly against the reading gap 222, then what the further Auf mayber shunt the support plate 36 is slower, as is desired in view of the desired scan speed.
  • the moving of the storage film 46 via the read gap 222 is carried out without contact under a small amount of play, so that no grinding marks are produced on the storage film 46 even after a long period of use.
  • a circular arcuate extinguishing lamp 230 may be placed, which frees the storage film 46 of residual images when the storage film is moved together with the support plate 36 in Figure 11 down to make a new recording.
  • a storage film having other properties e.g., size, sensitivity, resolution
  • the storage film can then be protected by an attached cap 232 against daylight, which is automatically stripped off when driving up again in the read-out part 204, as indicated by dashed lines in Figure 11.
  • Figure 12 shows schematically how to convert
  • Panoramic image can make.
  • a pixel B of the panography image (in the receiving surface A, in the embodiment considered here partially cylindrically curved storage film) is connected by a line L with a point R, which represents the X-ray source 12 with a substantially spherical characteristic. Now one looks for the intersection of this line

Abstract

L'invention concerne une cassette (14) qui est destinée à la panographie et qui est apte à enregistrer une pluralité d'écrans photostimulables (46, 48, 50) dans la forme adaptée à la géométrie de la mâchoire. Une plaque-support (36) de la cassette (14) s'adapte individuellement par élasticité ou plasticité à la forme de la mâchoire examinée concernée.
PCT/EP2010/007206 2009-12-21 2010-11-27 Cassette pour un écran photostimulable, écran photostimulable pour une telle cassette, appareil pour la lecture d'un écran photostimulable, appareil d'examen doté d'une telle cassette et procédé d'enregistrement d'images panographiques WO2011082738A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009060020.5 2009-12-21
DE102009060020A DE102009060020A1 (de) 2009-12-21 2009-12-21 Kassette für eine Speicherfolie, Speicherfolie zur Verwendung mit einer solchen, Gerät zum Auslesen einer Speicherfolie, Untersuchungsgerät mit einer derartigen Kassette und Verfahren zum Aufnehmen von panographischen Bildern

Publications (1)

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WO2011082738A1 true WO2011082738A1 (fr) 2011-07-14

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3476298A3 (fr) * 2013-12-23 2019-07-10 Vatech Co. Ltd. Dispositif d'imagerie dentaire à rayons x
CN110609434A (zh) * 2018-06-15 2019-12-24 杜尔牙科欧洲股份公司 X光成像板系统

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106175819A (zh) * 2016-06-27 2016-12-07 宁波蓝野医疗器械有限公司 口腔胶片扫描装置

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WO2007063980A1 (fr) * 2005-12-03 2007-06-07 Atsushi Takahashi Dispositif de prise d’images panoramiques intra-buccales et systeme de prise d’images panoramiques intra-buccales
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US2946892A (en) * 1958-01-22 1960-07-26 Foerderung Forschung Gmbh Arrangement for controlling and correcting the location of the focal spot produced by a cathode-ray on the target of a roentgen-tube
US3359423A (en) * 1964-11-18 1967-12-19 Westinghouse Electric Corp Panographic X-ray tubehead with a projecting anode rod mounted for manual movement about two mutually perpendicular axes
FR1566325A (fr) * 1968-01-31 1969-05-09
US3636349A (en) * 1970-01-27 1972-01-18 Pennwalt Corp Continuous orbit panographic x-ray
WO2000041035A1 (fr) * 1999-01-08 2000-07-13 Orion-Yhtymä Oyj Procede et appareil d'acheminement dans un dispositif de lecture de plaques images utilisees dans un radiogramme buccal
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DE102007045799A1 (de) * 2007-09-25 2009-04-09 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Modularer bildgebender Röntgen-Großdetektor
DE102008025909A1 (de) * 2008-05-29 2009-12-03 Dürr NDT GmbH & Co. KG Vorrichtung zum Auslesen von Speicherfolien

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3476298A3 (fr) * 2013-12-23 2019-07-10 Vatech Co. Ltd. Dispositif d'imagerie dentaire à rayons x
CN110609434A (zh) * 2018-06-15 2019-12-24 杜尔牙科欧洲股份公司 X光成像板系统

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