DE10343721B4 - Arrangement for image generation and image transmission for magnetic resonance tomographs - Google Patents

Arrangement for image generation and image transmission for magnetic resonance tomographs

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Publication number
DE10343721B4
DE10343721B4 DE2003143721 DE10343721A DE10343721B4 DE 10343721 B4 DE10343721 B4 DE 10343721B4 DE 2003143721 DE2003143721 DE 2003143721 DE 10343721 A DE10343721 A DE 10343721A DE 10343721 B4 DE10343721 B4 DE 10343721B4
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DE
Germany
Prior art keywords
image
eye
imaging system
characterized
patient
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
DE2003143721
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German (de)
Other versions
DE10343721A1 (en
Inventor
Ralf Adler
Ulrich Fischer
Rene Schüler
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.)
MEGAMEDICA MEDIZINTECHNISCHE ENTWICKLUNGSGESELLSCHAFT MBH
MEGAMEDICA MEDIZINTECHNISCHE E
Original Assignee
MEGAMEDICA MEDIZINTECHNISCHE E
MEGAMEDICA MEDIZINTECHNISCHE ENTWICKLUNGSGESELLSCHAFT MBH
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 MEGAMEDICA MEDIZINTECHNISCHE E, MEGAMEDICA MEDIZINTECHNISCHE ENTWICKLUNGSGESELLSCHAFT MBH filed Critical MEGAMEDICA MEDIZINTECHNISCHE E
Priority to DE2003143721 priority Critical patent/DE10343721B4/en
Publication of DE10343721A1 publication Critical patent/DE10343721A1/en
Application granted granted Critical
Publication of DE10343721B4 publication Critical patent/DE10343721B4/en
Application status is Expired - Fee Related legal-status Critical
Anticipated expiration legal-status Critical

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Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/10Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
    • A61B3/14Arrangements specially adapted for eye photography
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/10Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
    • A61B3/113Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for determining or recording eye movement
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00Arrangements or instruments for measuring magnetic variables
    • G01R33/20Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/283Intercom or optical viewing arrangements, structurally associated with NMR apparatus

Abstract

arrangement for image generation and image transmission for MRI, in which a patient's eye (44) with an image of a display (17) Help of an endoscopic imaging system (13) for viewing is presented by an eyepiece (29), characterized in that at one end of the endoscopic lens (24, 25) Imaging system (13), the display (17) and a camera (32) are located, the latter being over a beam splitter (20) IR light is supplied, and that at other end of the imaging system (13) of the endoscope beam path is divided into two parts and each partial beam path has an image plane (23, 36, 40), wherein a diffusing screen (23, 40) is located in one of the image planes, on the through the endoscopic imaging system (13) an image of the display (17) is created for viewing, and in the other picture plane (36) a picture of the infrared illuminated patient's eye (44) the eyepiece (29) and an imaging element (35, 41) is created, the through the endoscopic imaging system (13) via the beam splitter (20) into the camera ...

Description

  • The The invention relates to an arrangement for image formation and image transmission for magnetic resonance tomographs (MRT) according to the genus of the claims.
  • The Magnetic resonance tomography, in which a patient to be examined, whose head is in a head coil into a tunnel of a Tomographs has become one in the last decade developed a major medical examination method. It will be the patient one or two eyed images or video sequences presented and thereby his brain in defined states. The pictures generating unit must because of their electromagnetic energy to be ensured compatibility to the MRI itself generally outside of the MRI tunnel so that the images of the imaging unit in the narrow tunnel to the patient's eyes must be transferred. In addition to image transfer are often used simultaneously with the functional MRI measurement response times and Error rates of the patient recorded. Especially enlightening thereby the evaluation of the pupil movement and the eyelid strike of the Patients undergoing a transmission on an outside the MRT tunnel receiving device and thus more Claim space in the tunnel.
  • in the In detail, from WO 95/14429 a fiber optic transmission and Projection system with a translucent lens for aperture widening and a subsequent one Mirror eyepiece on the patient side known, where the mirror serves to compensate for visual defects of the patient. The disadvantages of this system are in the limited image resolution through the fiber optics, the high price for fiber optic image guide with ordered fibers and in the acute Risk of fiber breakage to see in the picture ladder. The company Avotec Inc. offers in their publication "Eye Tracking" from 23.06.03 additionally Fiber optic image guidance system for observation of the pupil movements of a Patients. The one for this necessary elaborate additional Image guides are connected to the mirror eyepiece.
  • The EP 12 05 145 A2 has a screened video projection system containing a video projector and a lens group on the head coil near the patient's eyes. An image of the projector projected onto the lens and viewed by a patient. The main disadvantage of the system is the small viewing distance of nominally 250 mm. Although this can be slightly increased by moving the mirror group, however, the patient must accommodate at least +2 d, which is not possible in particular in older patients without glasses. Glasses may not be worn on MRI. Another disadvantage of the system is the large change in the visual angle with a variation of the visual distance; in contrast, the experimental paradigms often require adherence to defined visual angles.
  • In the US 5076275 A and US 5864331 A MRI systems are described in which a patient looks over deflecting means at an image which is produced on a projection screen outside the MRT tunnel. The disadvantage here is the highly restricted by the MRI tunnel field of view and the lack of compensation for any existing defective vision. In addition, these MRI systems do not allow the display of independent, eg stereoscopic images separately for each eye.
  • In the US 5339813 A describes a viewing system for MRI tunnels in which a patient looks through a telescope directly at the display of a video projector whose front lens is removed. Such a viewing system has extremely small exit pupils; his eyepieces must be aligned exactly with the patient's pupils. Even with relatively small eyesight of the patient in the direction of one of the edges of the image, the images can wander out of the field of vision.
  • In the US 5134373 A For example, an imaging channel with a fiber optic image guide and a prism is described in which an image is projected onto a screen for viewing by a patient. The MR Eyetracker from Cambridge Research Systems Ltd., company brochure dated 15.07.03 also works with fiber optic cables. For the purpose of functional magnetic resonance imaging, a pupil movement tracking device comprises optical fibers and a deflection mirror that permits combination with a video and audio system. The disadvantage of this eye tracker is that there is no image transfer from a patient's eye to a camera, but only scattered light components of a pupil reflex are evaluated via two light guides. In addition, a calibration of the Eyetracker of approximately 5 minutes is required for each patient before use.
  • The US 5877732 A discloses a three-dimensional high-resolution video and audio system based on magnetic resonance images in which an optical relay lens system is used to generate an image to be viewed by a patient. A simultaneous detection of the eye condition during the image viewing does not take place.
  • It is an object of the present invention to provide a compact, stable, inexpensive yet accurate image transfer system in an MRI. The system should be in easier For example, image transfer from one or more imagers outside of an MRI tunnel to the eyes of a patient in the MRI tunnel and simultaneous image transfer of the patient's eyes to at least one camera outside the MRI tunnel.
  • According to the invention This object is achieved by the characterizing features of the first claim solved. Advantageous embodiments of the invention are specified in the subclaims. The image transfer increased with the help of an endoscope across from the use of fiber optic cables not just the economy and security of image transmission, but also their dissolution. Advantageous can use the same endoscope for image transmission paradigms on both the patient's eye and imaging of the patient's eye to a camera outside the MRI tunnel. Furthermore The use of an endoscope has the advantage of being targeted Change his optical system aberrations of the entire image transmission system or its enlargement in can be easily corrected. By use two endoscopes or image transmission systems Is it possible, to each eye and from each eye an independent, stereoscopic image to create. The means for image correction can also be applied to the endoscopes. or be subordinate. Every endoscopic system is to be switched off from foreign influences arranged in a closed imaging channel. For lighting Of the eye, IR light is preferably used, which passes through the eye at least one optical fiber outside the image transmission system or through the image transmission system is forwarded. Both possibilities to the illumination of the eye can also be combined with each other. As infrared light sources may preferably LED s serve. So that the image of the eye the imaging surface of the Camera is fully exploited, it is an imaging optical link immediately upstream.
  • The Invention will be explained in more detail below with reference to the schematic drawing. It demonstrate:
  • 1 an embodiment of the invention in an MRI,
  • 2 a detailed optical structure of an inventive arrangement and
  • 3 one of 2 deviating optical design of the optical arrangement in the vicinity of the patient's eye.
  • In 1 is located in a tunnel 11 a magnetic resonance tomograph 10 a couch 12 with a patient 14 , an image transmission system, in a closed imaging channel 13 is arranged, and a head coil 15 for the patient's head 14 , The picture channel 13 connects to a shielded housing 16 on, with or on a stand 33 is pivotally mounted in a plane that in 1 directed at right angles to the plane of the drawing. In addition, the housing 16 and the picture channel 13 with or on the stand 33 adjustable in height, parallel to the drawing plane, and the imaging channel 13 is in terms of its length, eg. By a telescopic design, changeable.
  • Before the patient 14 on the couch 12 in the MRT tunnel 11 is driven, the image transmission system must by appropriate changes of the imaging channel 13 over the patient 14 be positioned so that the patient is in the eyepiece ( 29 in 2 ) can look. Ametropia of the patient 14 between approx. +6 dpt and -6 dpt can be compensated for example by adjusting the eyepiece. Due to the formation of the eyepiece, the patient can fully see the image information regardless of his pupil distance without individual adaptation of the insights into the image transmission systems. In the exemplary embodiment, the exit pupil of the image transmission system is approximately 20 mm in front of the front lens of the eyepiece and has a diameter of 20 mm.
  • It It goes without saying that for double-blind consideration for each Eye an image transmission system must be present.
  • In 2 are housed in an electromagnetic radiation shielding housing 16 the belonging to an image transmission system electrical or electronic components. To the case 16 closes a substantially formed as a tube imaging channel 13 with an optical axis OO, which consists of a magnetically and electrically non-conductive material. The pipe 13 protrudes into the housing with one end 16 into and near this end and in the case 16 an approach 46 on, in which a camera 32 and an optic 45 are located. At the other end is the tube 13 Doubly cranked, so that the visualized by the optical axis OO optical imaging beam path of the image transmission system undergoes a parallel displacement and to an eye 44 is directed. From the case 16 are seen in the tube 13 one light source in succession 18 , a condenser 19 , a display 17 , an IR-selective mirror 20 , a multiple array of lenses 24 and 25 , which in their entirety form an endoscopic imaging system and repeats intermediate pictures 26 produce. The last lens 25 is already in the bent part 22 of the pipe 13 , between two deflection mirrors that provide the optical offset 27 . 28 (or prisms). The deflection mirror 28 are a lens group 30 for optical correction, a partially transparent mirror 31 and a diffuser 23 downstream. Furthermore, are in the cranked part 22 of the pipe 13 a concave mirror 35 , an edge filter 37 and an eyepiece 29 for an eye about 20 mm away 44 , The illumination of the eye 44 serve an IR light source 33 in the shielded housing 16 and a fiber optic cable 34 that is essentially parallel to the pipe 13 close to the eye 44 is guided. The IR light source 33 can also be in the pipe 13 are located and the lighting of the eye 44 done through the pipe.
  • the display 17 becomes from the visible light emitting light source 18 over the condenser 19 illuminated. Through the mirror 20 (or prism cube with splitter surface), the endoscopic imaging system n ( 24 . 25 ), the lens group 30 and about the deflection mirrors 27 . 28 . 31 becomes the display 17 on the reflected light disc 23 displayed. About the variation of the number of lens groups 24 . 25 In the endoscopic imaging system, the image transmission system can basically be adapted to the tunnel length. In a telescopic design of the imaging channel 13 The length change must be in one of the parallel beam paths between two lenses 24 and 25 done by the endoscopic system. Through the eyepiece 29 and the non-imageable partially transmissive mirror in this case 31 looks at the patient's eye 44 the picture of the display 17 on the incident light disc 23 , which can be designed to compensate for a possible caused by the eyepiece field curvature corresponding curved. A possibly still existing distortion of the Okularabbildung can by an opposite distortion of the Okularbildes on the spreading disc 23 be compensated. This can also serve a targeted optical distortion of the endoscopic beam path; in 2 is the targeted optical distortion by the lens group 30 reached.
  • The eye 44 is illuminated with IR light and through the eyepiece 29 as well as the concave mirror 35 an intermediate picture 36 of the eye in the bent part 22 generated. The location of this intermediate image is determined by a corresponding focal length of the concave mirror 35 chosen so that this intermediate image through the splitter mirror 31 through and from the endoscopic imaging system n. 24 . 25 ) and by reflection at the IR-selective mirror 20 to the camera 32 transmitted and imaged with infrared light.
  • Thus the normally white light from the display 17 from the concave mirror 35 is not reflected back, this must be IR-selective or it will, as in 2 shown an IR edge filter 37 arranged in the beam path. When tilting the filter 37 There are no disturbing reflections from the filter surface. In front of the camera 32 is advantageously the optical member 45 attached, which is the IR image of the patient's eye 44 projected in optimal size on the image pickup surface.
  • Will the eyepiece 29 shifted along its optical axis to compensate for defective vision of the patient, so shifts the intermediate image 36 of the patient's eye 44 so slightly axial that the image of the patient's eye on the camera 32 stays sufficiently sharp.
  • In 3 is the in 2 Twofold cranked part 22 of the picture channel 13 through a simple right-angled bend 47 replaced. Incidentally, in the picture channel 13 again the intermediate image level 26 and the endoscope lenses 24 and 25 recognizable, between which a telecentric beam path exists. The endoscopic system 24 . 25 forms an unillustrated display (paradigms) via an IR-transmissive deflection mirror 38 and a lens group 30 on a diffuser 40 from. This display image is through the eyepiece 29 and the IR-selective mirror 39 viewable.
  • The lighting of an in 3 Patient eye not shown is used by an unillustrated IR LED outgoing light guide cable 24 , For IR imaging of the eye in an intermediate image plane 36 becomes the eyepiece 29 together with a lens 41 used, wherein the deflection of the imaging beam path through the IR-selective mirror 39 and the deflecting mirror 42 he follows. The deflection mirror 43 leads the IR imaging beam path back to the endoscopic imaging system, whose focus facing the eye in the intermediate image plane 36 located. For the rest, this is true too 2 Said analogously.
  • 10
    Magnetic resonance tomograph
    11
    tunnel
    12
    lounger
    13
    Figure channel pipe
    14
    patient
    15
    head coil
    16
    casing
    17
    display (Paradigms)
    18
    light source
    19
    condenser
    20 31, 39
    mirror
    21
    kinking
    22
    bend
    23
    Auflichtstreuscheibe
    24 25
    lenses
    26
    intermediate images
    27 28, 38, 42, 43
    Deflecting mirror (prisms)
    29
    eyepiece
    30
    lens group
    32
    camera
    33
    stand
    34
    optical cable
    35
    concave mirror
    36
    Intermediate image (plane)
    37
    cut-off filter
    40
    By light diffuser
    41
    lens
    44
    patient's eye
    45
    optical element
    46
    approach
    47
    kinking
    48
    IR light source
    O-O
    optical axis

Claims (9)

  1. Arrangement for imaging and image transmission for MRI, in which a patient's eye ( 44 ) an image of a display ( 17 ) using an endoscopic imaging system ( 13 ) for viewing through an eyepiece ( 29 ), characterized in that at one end of the lens ( 24 . 25 ) endoscopic imaging system ( 13 ) the display ( 17 ) and a camera ( 32 ), the latter via a beam splitter ( 20 ) IR light and that at the other end of the imaging system ( 13 ) the endoscope beam path is divided into two parts and each partial beam path has an image plane ( 23 . 36 . 40 ), wherein in one of the image planes a lens ( 23 . 40 located on the endoscopic imaging system ( 13 ) an image of the display ( 17 ) is generated for viewing, and in the other image plane ( 36 ) an image of the infrared illuminated patient's eye ( 44 ) through the eyepiece ( 29 ) and an imaging element ( 35 . 41 ) produced by the endoscopic imaging system ( 13 ) via the beam splitter ( 20 ) into the camera ( 32 ) is displayed.
  2. Arrangement according to claim 1, characterized in that the endoscopic imaging system ( 13 ) is changeable to change the magnification and / or to correct the image.
  3. Arrangement according to claim 1, characterized in that the endoscopic imaging system ( 13 ) is located in a closed imaging channel.
  4. Arrangement according to claim 1, characterized in that means for image correction ( 30 ) between the endoscopic imaging system ( 13 ) and the eye ( 44 ) are provided.
  5. Arrangement according to claim 1, characterized in that at least one infrared light source ( 48 ) remote from the eye ( 44 ) is arranged and the infrared light through at least one optical waveguide ( 34 ) the eye ( 44 ).
  6. Arrangement according to claim 1, characterized in that an infrared light source ( 48 ) near the camera ( 32 ) and the infrared light is directed to the eye ( 44 ) through the endoscopic imaging system ( 13 ).
  7. Arrangement according to claim 5, characterized in that the infrared light source ( 48 ) is an IR LED.
  8. Arrangement according to claim 1, characterized in that the camera ( 32 ) an imaging optical element ( 45 ) is directly upstream.
  9. Arrangement according to claim 6 or 7, characterized in that for the illumination of the eye ( 44 ) Infrared light through both the optical fiber ( 34 ) as well as through the endoscopic imaging system ( 13 ) the eye ( 44 ).
DE2003143721 2003-09-17 2003-09-17 Arrangement for image generation and image transmission for magnetic resonance tomographs Expired - Fee Related DE10343721B4 (en)

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Application Number Priority Date Filing Date Title
DE2003143721 DE10343721B4 (en) 2003-09-17 2003-09-17 Arrangement for image generation and image transmission for magnetic resonance tomographs

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DE10343721B4 true DE10343721B4 (en) 2005-09-22

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5076275A (en) * 1991-01-04 1991-12-31 Ronen Bechor Viewing system inert to magnetic flux
US5134373A (en) * 1988-03-31 1992-07-28 Kabushiki Kaisha Toshiba Magnetic resonance imaging apparatus employing optical viewing screen
US5339813A (en) * 1993-08-06 1994-08-23 The Mcw Research Foundation, Inc. Patient video system for medical imaging equipment
WO1995014429A1 (en) * 1993-11-26 1995-06-01 Paul Bullwinkel Fiber optic video glasses and projection system
US5864331A (en) * 1995-08-14 1999-01-26 General Electric Company Shielding system and method for an entertainment system for use with a magnetic resonance imaging device
US5877732A (en) * 1994-04-13 1999-03-02 Resonance Technology Co. Three-dimensional high resolution MRI video and audio system and method
EP1205145A2 (en) * 2000-11-03 2002-05-15 Avotec Shielded video projection system for MRI

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5134373A (en) * 1988-03-31 1992-07-28 Kabushiki Kaisha Toshiba Magnetic resonance imaging apparatus employing optical viewing screen
US5076275A (en) * 1991-01-04 1991-12-31 Ronen Bechor Viewing system inert to magnetic flux
US5339813A (en) * 1993-08-06 1994-08-23 The Mcw Research Foundation, Inc. Patient video system for medical imaging equipment
WO1995014429A1 (en) * 1993-11-26 1995-06-01 Paul Bullwinkel Fiber optic video glasses and projection system
US5877732A (en) * 1994-04-13 1999-03-02 Resonance Technology Co. Three-dimensional high resolution MRI video and audio system and method
US5864331A (en) * 1995-08-14 1999-01-26 General Electric Company Shielding system and method for an entertainment system for use with a magnetic resonance imaging device
EP1205145A2 (en) * 2000-11-03 2002-05-15 Avotec Shielded video projection system for MRI

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