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US20050281372A1 - Radiology device comprising improved image enlarging means - Google Patents

Radiology device comprising improved image enlarging means Download PDF

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Publication number
US20050281372A1
US20050281372A1 US10/991,096 US99109604A US2005281372A1 US 20050281372 A1 US20050281372 A1 US 20050281372A1 US 99109604 A US99109604 A US 99109604A US 2005281372 A1 US2005281372 A1 US 2005281372A1
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Prior art keywords
images
optical
radiology device
assembly
radiology
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Abandoned
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US10/991,096
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English (en)
Inventor
Peter Choi
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Individual
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Abandoned legal-status Critical Current

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    • 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
    • A61B6/48—Diagnostic techniques
    • A61B6/482—Diagnostic techniques involving multiple energy imaging
    • 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
    • A61B6/42—Arrangements for detecting radiation specially adapted for radiation diagnosis
    • A61B6/4208—Arrangements for detecting radiation specially adapted for radiation diagnosis characterised by using a particular type of detector
    • A61B6/4225—Arrangements for detecting radiation specially adapted for radiation diagnosis characterised by using a particular type of detector using image intensifiers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
    • G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/02—Viewing or reading apparatus
    • G02B27/022—Viewing apparatus
    • G02B27/023—Viewing apparatus for viewing X-ray images using image converters, e.g. radioscopes
    • 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
    • A61B6/40—Arrangements for generating radiation specially adapted for radiation diagnosis
    • A61B6/4035—Arrangements for generating radiation specially adapted for radiation diagnosis the source being combined with a filter or grating

Definitions

  • the present invention relates in a general manner to medical radiology devices. More precisely, the invention relates to a device making it possible to obtain high-resolution digital images of organs or of tissues which one wishes to examine (which for the sake of simplicity will be referred to subsequently in this text by the generic term “subject”), as well as of any desired region of the subject.
  • the visualization means allow dynamic viewing of the temporal evolution of the subject (visualization of the functioning of moving organs), thereby constituting an advantage and offering enhanced possibilities of implementation (recording of sequences illustrating the functioning of the subject, live operative assistance,
  • intensifiers which make it possible to convert the X-radiation into an optical image with high efficiency (that is to say by producing a high number of photons per incident X-ray).
  • the intensifiers comprise an output interface for displaying the primary images to an observer, or transmitting them to an image acquisition chain.
  • the fluoroscopy devices thus constitute an advantageous means of carrying out good quality radiological examinations. It is moreover possible to carry out the examination of the subject according to two types of procedures:
  • the second type of procedure offers the advantage of greater flexibility of use, making it possible initially to take a wide-field snapshot so as to identify zones of interest, then to center the device successively on each of these zones.
  • image acquisition and enlargement means are generally provided for gathering the primary images as a whole, and then carrying out an enlargement of a part of the primary image centered on the desired zone.
  • the resolution of the primary image is already greatly limited by the resolution of the intensifier itself, which is commonly of the order of from 1 to 2 pairs of lines per millimeter only.
  • the intensifiers of fluoroscopy devices generally comprise curved input screens which produce aberrations in certain parts of the image.
  • An aim of the invention is to alleviate the drawbacks mentioned hereinabove and to make it possible, on the one hand to construct a radiology device providing high-resolution images of any desired part of a subject, and on the other hand to implement such a device according to an advantageous process.
  • Another aim of the invention is to make it possible to construct a real-time radiology device in which inter alia the images are almost undeformed.
  • a radiology device comprising an X-ray source for exposing a subject to the radiation of said source, means for converting the X-rays into optical images so as to form primary optical images, means for transforming the primary optical images into secondary optical images, means for digitizing the secondary images and means for displaying the secondary images to a user, characterized in that the means for forming the secondary optical images comprise an optical chain comprising in succession, from the output of the converter to the output of the device, an image enlargement assembly exposed directly to the primary images from said conversion means, an assembly for optical intensification of the enlarged images and a photosensitive matrix sensor for making said secondary images.
  • Preferred, but nonlimiting aspects of the device according to the invention are the following:
  • the invention also pertains to the use of one of the embodiments of the device described hereinabove, for real-time radiological examinations (especially for applications in the industrial and maritime sectors).
  • FIGS. 1 to 3 are representations of the block diagram type of three embodiments of a radiology device according to the invention
  • FIG. 4 is a, schematic representation of image acquisition elements which can be implemented in a radiology device according to the invention.
  • FIG. 1 there has been schematically represented a first module 10 comprising an X-ray source 11 , and a fluorescent screen 12 .
  • This module 10 can be a conventional fluoroscopy module, the screen 12 delivering as output from the module 10 a primary visible image corresponding to the track of the X-rays emitted by the source 11 after they have passed through a subject S interposed between the source 11 and the screen 12 .
  • the device also comprises a second module, referenced 20 , for acquiring the primary images and for forming secondary images.
  • a second module referenced 20
  • the spatial coverage of these secondary images can correspond to that of the primary images formed on the fluorescent screen 12 , or else to only a part of these primary images.
  • the module 20 comprises in a lightproof enclosure:
  • optical elements 22 , 23 , 24 and 25 of the module 20 which are assembled in series and thus form an optical chain, are furthermore mounted on a two-axis movement system which is not represented in the figures. This system can move these optical elements in the two directions coplanar to the fluorescent screen 12 so as to bring in particular the enlargement assembly 22 opposite any desired zone of this screen.
  • the device comprises a third module 30 for processing and distributing the images arising from the module 20 .
  • This module 30 which constitutes a central control unit for the device, comprises in the embodiment represented in FIG. 1 the following elements which are interlinked:
  • the module 30 also comprises means (not represented in the figure) for controlling the system for moving the elements of the optical chain of the module 20 , in particular of the enlargement assembly 22 .
  • the device finally comprises an interface 40 for local visualization of images which, can consist of a high resolution video screen hooked up to the units of the module 30 .
  • This interface 40 can be a digital screen receiving the secondary images digitized by the unit 31 of the module 30 .
  • This device can function according to a continuous mode, likewise the subject of the invention, described hereinbelow:
  • the radiologist can visualize in real time on the screen 40 a secondary image corresponding to the entire primary images formed on the screen 12 , covering for example a widened field of the subject inside which the radiologist is searching for specific zones of study.
  • the radiologist can then control the continuous movement of the optical chain formed by the elements 22 , 23 , 24 and 25 in a plane parallel to the plane of the screen 12 , as well as the degree of enlargement of the image formed at the output of the lens 22 and transmitted to the other optical elements of the chain.
  • This degree of enlargement can be fixed by the radiologist at any desired value within, a given range, which depends on the choice of the assembly 22 .
  • the elements of the module 30 may be situated some distance from the other constituents of the device (in particular from the modules 10 and 20 ), for example in a separate room dedicated to: the control of the device and to the visualization of the images, or even in, a separate building.
  • the length of the link between the module 30 and the module 20 (which consists of at least one cable for, transmitting the images from the optical sensor 25 to the module 30 , and for transmitting the commands arising from the module 30 to the elements of the optical chain of the module 20 ) is suitably adapted.
  • the radiologist is provided with an interface (not represented) which can be associated with the visualization screen 40 .
  • This interface can use a control cable, linked to the module 30 to manually activate the image selection and capture process.
  • the screen 40 can be of any known type, inter alia a liquid crystal screen.
  • the module 30 can also be associated with a PC type control computer supplemented with the commands of the device (commands for exposure, for moving the optical chain and for enlargement, etc.).
  • a PC can contain a program for using the device, implementing a menu for the control of the device which is displayed on the screen 40 in combination with the output images from the device.
  • the resolution of the image is in no way altered by modifying the degree of enlargement, given that the assembly 22 which is composed solely of optical elements does not carry out any discretization of the image.
  • the image (enlarged or otherwise) is transmitted by the assembly 22 to the optical intensifier 23 , which will preferably be made up of so-called channel multiplier plate (or MCP according to the acronym in use) elements.
  • MCP channel multiplier plate
  • An exemplary embodiment of such an element will be found in U.S. Pat. No. 3,660,668. It is also possible to link several intensifier elements of the MCP type in series, and thus to obtain an optical gain of the order of 10 3 to 10 7 .
  • the intensity of the radiation of the X-ray source 11 is limit has a level equivalent has that conventionally implemented in intensifier fluoroscopy devices, that is to say the lengthy exposure of the radiologist and of the subject to radiation does not present a health risk.
  • an optical intensifier constructed from elements of the MCP type does not include elements of domed geometry such as the input screen of image intensifiers which is conventionally employed the fluoroscopy devices.
  • the enlargement assembly 22 is thus the only optical element of the device comprising curved parts, so that the optical aberrations and deformations of certain zones of the image are reduced to the minimum.
  • the radiologist can thus carry out a continuous examination of various zones of the subject, by moving the optical chain formed by the elements 22 , 23 , 24 and 25 and by controlling via the unit 35 the enlargement of the image on each desired zone in succession, the enlargement of the image not altering the spatial resolution of the image.
  • a unit for programming successive movements and enlargements can also be integrated into the module 30 in order to undertake a program of predetermined examinations.
  • the assembly 22 can also be physically detached from the other elements 23 , 24 , 25 of the optical chain of the module 20 , and it is also possible to control only the moving of this assembly 22 opposite the fluorescent screen 12 , image transmission means such as an optical fiber link then being provided between the assembly 22 and the intensifier 23 .
  • the radiological examination process described hereinabove can be conducted without changing the intensity of the X-radiation to which the subject is exposed. Indeed, since the enlarging of the image does not alter its resolution, it is not necessary to increase the dose of radiation in order to visualize a zone of detail of restricted dimension.
  • the digital images can be stored by the unit 32 and distributed to any type of digital peripheral (or analog peripheral by virtue of the video signals communication interface unit 33 ).
  • These peripherals may be visualization screens, high-resolution printers, remote means of storage and archiving, etc. They may be located on the same site as the device described above, or be situated remotely on other sites furnished with a link with the module 30 .
  • the radiologist can also take a first fast snapshot of a widened field containing the entire subject, then study the image produced at his/her leisure, the source 11 being inactivated. After having identified the specific zones which he/she wishes to study in greater detail, the radiologist can then reactivate the source 11 to obtain detailed images of these zones with the full resolution of the assembly of sensors 25 .
  • This mode of use of the invention makes it possible to further reduce the level of exposure of the radiologist and of the subject to radiation.
  • the module 30 can also comprise, in particular in the unit 31 , all the known means for digitally processing the image, such as means for manipulating the image (choosing zones, rotation, processing of contrast and thresholding operations, etc.).
  • the resolution of the images produced by the device according to the invention is very markedly greater than that of the images produced by the fluoroscopy device implementing image intensifiers.
  • the resolution of the images of these devices is in fact limited by the resolution of the intensifiers, which is at best of the order of from 1 to 2 pairs of lines per millimeter; the use of intensifiers of the MCP type, combined with the absence of discretization of the images during their enlargement, makes it possible to achieve a greater resolution.
  • the device according to the invention offers multiple possibilities of practical utilization
  • the files of the images may in fact be easily transmitted by electronic means to other sites so as for example, to solicit the opinions of different experts.
  • printers or of any other type of known peripheral for registering and/or printing on a medium such as paper (conventional or of photographic quality depending on requirements) the digital images arising from the module 30 , constitutes an extremely flexible and economical means of obtaining negatives equivalent to radiographic negatives, so that the device according to the invention can be used as a radiography or fluoroscopy apparatus.
  • FIG. 2 represents a second embodiment of the device according to the invention in which the module 20 is folded at 90°, the image from the fluorescent screen 12 being deflected to the optic al chain of the lens 22 by way of a deflecting mirror 26 .
  • the optical chain of the module 20 is oriented generally parallel to the plane of the screen 12 , a 90° deflecting mirror 26 deflecting the images from the screen 12 to the enlargement assembly 22 .
  • a “T”-shaped shield 27 is also provided in order to protect the elements of the optical chain from the X-radiation.
  • FIG. 3 presents a third embodiment of the invention, in which between the image intensifier and the refocusing lens 24 there has furthermore been interposed a prismatic mirror 28 for separating the image, so as to separate the images transmitted by the optical intensifier into two beams directed respectively towards the sensor 25 and towards a digital video camera 29 , these two elements being linked to the unit 31 of the module 30 .
  • This third embodiment allows separate acquisition of dynamic images (by the camera 29 ) and of static images (by the sensor 25 ); this arrangement makes it possible to further increase the flexibility and the performance of the device.
  • FIG. 4 represents a variant embodiment of elements of the optical chain of the device according to the invention, in which the image intensifier 23 is linked to the sensor 25 by a network of optical fibers 24 ′ in replacement for the refocusing lens 24 .
  • the device according to the invention is not limited to the embodiments described hereinabove, but may be embodied according to any variant within the scope of the person skilled in the art.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Medical Informatics (AREA)
  • Engineering & Computer Science (AREA)
  • General Health & Medical Sciences (AREA)
  • Optics & Photonics (AREA)
  • Pathology (AREA)
  • Veterinary Medicine (AREA)
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  • Radiology & Medical Imaging (AREA)
  • Biomedical Technology (AREA)
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  • Animal Behavior & Ethology (AREA)
  • Biophysics (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • High Energy & Nuclear Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Biochemistry (AREA)
  • Analytical Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Immunology (AREA)
  • Apparatus For Radiation Diagnosis (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
  • Conversion Of X-Rays Into Visible Images (AREA)
  • Transforming Light Signals Into Electric Signals (AREA)
  • Facsimile Heads (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
  • Radiography Using Non-Light Waves (AREA)
  • Professional, Industrial, Or Sporting Protective Garments (AREA)
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US10/991,096 1999-09-14 2004-11-18 Radiology device comprising improved image enlarging means Abandoned US20050281372A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US10/991,096 US20050281372A1 (en) 1999-09-14 2004-11-18 Radiology device comprising improved image enlarging means

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
FR9911469 1999-09-14
FR9911469A FR2798551B1 (fr) 1999-09-14 1999-09-14 Dispositif de radiologie comportant des moyens d'agrandissement d'images perfectionnees
PCT/FR2000/002524 WO2001019250A1 (fr) 1999-09-14 2000-09-13 Dispositif de radiologie comportant des moyens d'agrandissement d'images perfectionnees
US7090302A 2002-07-24 2002-07-24
US10/991,096 US20050281372A1 (en) 1999-09-14 2004-11-18 Radiology device comprising improved image enlarging means

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PCT/FR2000/002524 Continuation WO2001019250A1 (fr) 1999-09-14 2000-09-13 Dispositif de radiologie comportant des moyens d'agrandissement d'images perfectionnees
US7090302A Continuation 1999-09-14 2002-07-24

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US20050281372A1 true US20050281372A1 (en) 2005-12-22

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US10/991,096 Abandoned US20050281372A1 (en) 1999-09-14 2004-11-18 Radiology device comprising improved image enlarging means
US11/024,962 Abandoned US20050281370A1 (en) 1999-09-14 2004-12-30 Radiology device
US11/404,773 Expired - Fee Related US7508914B2 (en) 1999-09-14 2006-04-17 Radiology device

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US11/404,773 Expired - Fee Related US7508914B2 (en) 1999-09-14 2006-04-17 Radiology device

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US (3) US20050281372A1 (fr)
EP (1) EP1213995B1 (fr)
JP (1) JP4712262B2 (fr)
AT (1) ATE404119T1 (fr)
AU (1) AU7428500A (fr)
DE (1) DE60039894D1 (fr)
DK (1) DK1213995T3 (fr)
ES (1) ES2312362T3 (fr)
FR (1) FR2798551B1 (fr)
HK (1) HK1047529B (fr)
PT (1) PT1213995E (fr)
WO (1) WO2001019250A1 (fr)

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FR2824922B1 (fr) * 2001-05-18 2004-10-29 Thales Sa Correction de distorsion d'un intensificateur d'image
WO2006049183A1 (fr) * 2004-11-01 2006-05-11 Mach Technology Co., Ltd. Dispositif de formation d'image par rayonnement
US7289601B2 (en) * 2004-12-01 2007-10-30 Imascope Inc. Digital image collector for X-ray systems
US8737567B2 (en) * 2011-01-27 2014-05-27 Medtronic Navigation, Inc. Image acquisition optimization
US10013518B2 (en) * 2012-07-10 2018-07-03 Kla-Tencor Corporation Model building and analysis engine for combined X-ray and optical metrology

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US5117446A (en) * 1990-02-17 1992-05-26 U. S. Philips Corporation X-ray diagnostic apparatus comprising means for the enlarged visual display of a selectable detail of the overall image
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US3912936A (en) * 1972-09-15 1975-10-14 Machlett Lab Inc X-ray image intensifier system
US4379967A (en) * 1980-08-22 1983-04-12 Mcintyre John A Fiber optic matrix coding method and apparatus for radiation image amplifier
US4467351A (en) * 1981-11-30 1984-08-21 Yen Wang Minimal radiologic imaging method and apparatus
US4562464A (en) * 1982-01-08 1985-12-31 Tokyo Shibaura Denki Kabushiki Kaisha X-Ray diagnostic apparatus
US4896344A (en) * 1984-10-15 1990-01-23 Grady John K X-ray video system
US5138642A (en) * 1989-03-02 1992-08-11 Innovative Imaging Systems, Inc. Detector imaging arrangement for an industrial CT device
US5117446A (en) * 1990-02-17 1992-05-26 U. S. Philips Corporation X-ray diagnostic apparatus comprising means for the enlarged visual display of a selectable detail of the overall image
US5452337A (en) * 1992-04-01 1995-09-19 Sony Corporation Radiation diagnostic system
US5308986A (en) * 1992-12-17 1994-05-03 Nanoptics Incorporated High efficiency, high resolution, real-time radiographic imaging system
US5394455A (en) * 1993-04-30 1995-02-28 The Regents Of The University Of California Digitally aided microfluoroscopy and fluorospot system and method of using the same
US5463668A (en) * 1993-09-14 1995-10-31 Kabushiki Kaisha Toshiba X-ray diagnosis apparatus
US6091796A (en) * 1994-11-23 2000-07-18 Thermotrex Corporation Scintillator based microscope
US5932880A (en) * 1996-05-09 1999-08-03 Hitachi, Ltd. Scintillator device and image pickup apparatus using the same
US5949811A (en) * 1996-10-08 1999-09-07 Hitachi Medical Corporation X-ray apparatus

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Publication number Publication date
DE60039894D1 (de) 2008-09-25
AU7428500A (en) 2001-04-17
DK1213995T3 (da) 2008-12-01
WO2001019250A1 (fr) 2001-03-22
EP1213995A1 (fr) 2002-06-19
FR2798551B1 (fr) 2001-11-30
US7508914B2 (en) 2009-03-24
FR2798551A1 (fr) 2001-03-16
ES2312362T3 (es) 2009-03-01
PT1213995E (pt) 2008-11-20
EP1213995B1 (fr) 2008-08-13
JP2003509100A (ja) 2003-03-11
US20060193431A1 (en) 2006-08-31
US20050281370A1 (en) 2005-12-22
JP4712262B2 (ja) 2011-06-29
HK1047529A1 (zh) 2003-02-28
ATE404119T1 (de) 2008-08-15
HK1047529B (zh) 2009-01-16

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