WO1992004862A1 - Procede et dispositif pour l'etablissement d'une correspondance anatomique correctement localisee des centres d'excitation de signaux biomagnetiques - Google Patents

Procede et dispositif pour l'etablissement d'une correspondance anatomique correctement localisee des centres d'excitation de signaux biomagnetiques Download PDF

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Publication number
WO1992004862A1
WO1992004862A1 PCT/DE1991/000731 DE9100731W WO9204862A1 WO 1992004862 A1 WO1992004862 A1 WO 1992004862A1 DE 9100731 W DE9100731 W DE 9100731W WO 9204862 A1 WO9204862 A1 WO 9204862A1
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WIPO (PCT)
Prior art keywords
coordinate system
excitation
ultrasound
applicator
coordinates
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Application number
PCT/DE1991/000731
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German (de)
English (en)
Inventor
Dietrich Hassler
Helmut Reichenberger
Günter TEMME
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Siemens Aktiengesellschaft
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Publication of WO1992004862A1 publication Critical patent/WO1992004862A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
    • A61B8/08—Detecting organic movements or changes, e.g. tumours, cysts, swellings
    • A61B8/0833—Detecting organic movements or changes, e.g. tumours, cysts, swellings involving detecting or locating foreign bodies or organic structures
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
    • A61B5/242—Detecting biomagnetic fields, e.g. magnetic fields produced by bioelectric currents

Definitions

  • the invention relates to two methods for correctly assigning the excitation centers of biomagnetic signals in an examination area with an anatomical structure to an image of the anatomical structure.
  • the invention also relates to a device for correctly assigning the excitation centers of biomagnetic signals with an anatomical structure to an image of the anatomical structure.
  • EKG electrocardiogram
  • EEG electroencephalogram
  • biomagnetic signals originate in electrical current pulses that occur periodically or sporadically in the body and are generally not stationary. Such current pulses generate electrical and magnetic fields according to the laws of electrodynamics.
  • a major advantage of the magnetic field is that the course of the field lines from the surrounding tissue remains largely uninfluenced, while the field lines of electrical fields are strongly influenced by inhomogeneities in the conductivity in the body and run to the surface in a variety of deformations. From the distribution of the magnetic induction, the current source or the excitation center can therefore be located much more precisely than from the electrical potential distribution on the body surface.
  • the exact assignment of the measuring system to the patient is of particular importance. For this purpose, special holders for the patient and current-carrying coils serve as positioning aids, the position of which is recognized by the biomagnetic measuring system.
  • the evaluation of the measurement and the presentation of its results can be done in different ways.
  • a selected time interval e.g. a cardiac cycle
  • the time signals are displayed in accordance with the geometric arrangement of the induction coils. This is referred to as a grid representation.
  • the two-dimensional distribution of the magnetic field at the location of the measuring system can be reproduced on a color monitor as a so-called map representation at any time of the interval.
  • a time feed can be selected so that the field distribution, e.g. during the
  • QRS complex at the heart can be represented quasi-dynamically as a sequence of maps.
  • biomagnetic examinations are particularly indicated where it is important to locate current sources or excitation centers as precisely as possible or, since these are generally not stationary, to describe their course quantitatively in terms of space and time.
  • the movement of the current source or of the excitation center can be represented quantitatively in time and in three dimensions and entered in three-dimensional image data sets which can be obtained with a slice image method.
  • NMR systems magnetic resonance systems
  • X-ray systems the expenditure on equipment for creating the image data sets is high.
  • the Positioning aids provided as coils change their position, which results in a shift of the biomagnetic signals in the anatomical sectional images and thus an incorrect anatomical assignment of the excitation centers. If the anatomical structures are determined with the aid of an NMR system, the coils must be exchanged for positioning aids which are visible in the NMR image. Errors can also arise here due to changes in position.
  • the invention is based on the object of determining the anatomical structure of the examination area without radiation exposure and with little outlay on equipment, without the patient having to be repositioned.
  • the object is achieved according to the invention by a first method with the following steps: the excitation locations of the biomagnetic signals determined with the aid of a biomagnetic measuring system are present in a first coordinate system; the image signals obtained with the aid of an ultrasound applicator are present in a second coordinate system; Marking points lie in the examination area or on a surface of the examination area that is accessible to the ultrasound applicator, the position of which is known in both coordinate systems; the two coordinate systems are transformed so that all marking points coincide; the location of each excitation center is shown in the ultrasound image with a sign.
  • the object is achieved by a second method with the following steps: the excitation locations of the biomagnetic measuring system, which are determined with the aid of a biomagnetic measuring system, are present in a first coordinate system; the image signals obtained with the aid of an ultrasound applicator are present in a second coordinate system; the location of the examination area when determining the image signals is compared to the Position of the investigation area unchanged when determining the excitation locations; the two coordinate systems are fixed to each other; one coordinate system is calibrated with respect to the other coordinate system so that both coordinate systems coincide; the location of each excitation location is shown in the ultrasound image with a sign.
  • a device having a biomagnetic measuring system arranged on a framework, which determines the excitation centers of the biomagnetic signals in a first coordinate system, the framework being attached to a base plate at a connection point, with one a linkage attached ultrasound applicator which determines image signals of the examination area in a second coordinate system, the linkage being connected on one side to the base plate at a reference point and one coordinate system being calibrated with respect to the other coordinate system, so that the position of each excitation can be displayed with a character in the ultrasound image.
  • Ultrasound images can be created in particular from the following examination areas: the heart with the ultrasound-permeable intercostal space or from the esophagus; the brain of toddlers across the fontanel and the entire abdomen.
  • the determination of the anatomical structure with the aid of ultrasound is particularly advantageous when the excitation centers of biomagnetic signals are assigned correctly because the ultrasound sectional images can be created immediately before or after the measurement of the biomagnetic signals without rearranging the patient.
  • the ultrasound device is brought into the shielded measuring room.
  • the ultrasound device In the case of the biomagnetic measurement itself, the ultrasound device is located outside the measuring room, so that no part of the device falsifies the biomagnetic measurements can.
  • the ultrasound device is relatively small and inexpensive compared to an X-ray or NMR system.
  • An advantageous embodiment is characterized in that the coordinates of the excitation centers in the first coordinate system are transformed into the coordinates of the second coordinate system. Since only a small number of excitation centers is determined in comparison to the number of pixels in the ultrasound sectional image, such a transformation can be carried out quickly.
  • the coordinate systems are arranged arbitrarily with respect to one another, it is sufficient according to a further embodiment that the position of at least three marking points is known, which, however, must not lie on a line.
  • a particularly advantageous embodiment is characterized by the fact that marking points lie on a surface of the examination area that is accessible to the ultrasound applicator, that the position of at least one marking point in the first coordinate system is determined with the aid of the biomagnetic measuring system, that an auxiliary mark whose Coordinates are recorded in the second coordinate system, are brought into congruence with the marking point or the marking points, and that, in the case of congruence, the coordinates of the auxiliary mark in the second coordinate system correspond to the corresponding coordinates of the existing marking points in the first coordinate system. Coordinate systems lying arbitrarily with respect to one another are thus clearly assigned to one another immediately before the ultrasound sectional images are created.
  • the ultrasound applicator is connected to a linkage, the ultrasound applicator being movable in all spatial directions via a linkage.
  • the coordinates of the cutting plane, which is scanned by the ultrasound applicator, are determined in a simple and precise manner by means of rotary and / or displacement sensors arranged on the linkage.
  • a further advantageous embodiment is characterized in that the ultrasound applicator is displaced with the aid of servomotors. This means that precisely reproducible cutting planes can be scanned automatically.
  • the coordinates of the auxiliary mark and the cutting plane are recorded via a contactless position detection.
  • a particularly advantageous embodiment is characterized in that several ultrasound sectional images are generated from the examination area, the creation of which is triggered by a periodic body signal.
  • the exact location of the excitation centers during a cardiac period can be determined.
  • a particularly advantageous embodiment of the invention is characterized in that the ultrasound applicator is designed as a transesophagus applicator, that the position of the sectional plane that can be scanned by the transesophagus applicator with respect to the first coordinate system is at least three different Nen locations of the transesophagus applicator arranged coils is determined with the help of the biomagnetic measuring system.
  • the heart is particularly well accessible to ultrasound waves from the esophagus and differently lying sectional images of the heart can be created.
  • a particularly advantageous method is characterized in that the coordinate values of the position of the cutting plane in which an excitation center lies are displayed on the screen, that the coordinate values of the position of the sectional image generated by the ultrasound applicator are displayed on the screen and that the ultrasound applicator is moved over the examination area while observing the coordinate values such that the position coordinates of the two sectional planes are the same.
  • the amount of data that is generated during a volume scan is considerably limited by only displaying a section plane on which a predetermined excitation center lies on the screen.
  • a sectional plane in which an excitation center lies can be determined in a further advantageous embodiment in that the position of the sectional plane and the position of an excitation center are shown in a 3D representation, that the excitation location is particularly emphasized when it follows a change in the position of the sectional plane lies in the sectional plane, and that a sectional image is then created in this sectional plane, the location of the excitation location being indicated in the ultrasound image with the symbol.
  • IG 1 coordinate systems displaced parallel to one another for the biomagnetic measurement and for ultrasound sectional images
  • IG 2 two arbitrarily arranged coordinate systems for the biomagnetic measurement and the ultrasound sectional images
  • IG 3 arrangement of the sectional planes in a volume scan, which results from sector scans shifted in parallel
  • IG 4 a tripod with angle and displacement sensors to determine the coordinates of an ultrasound applicator. . scanned cutting plane and for guiding the ultrasound applicator
  • IG 5 an articulated arm with angle sensor to determine the
  • IG 6 is an ultrasound applicator with light-emitting diodes arranged on its surface, which serve for contactless determination of the coordinates of the cutting plane scanned by the ultrasound applicator;
  • IG 7 shows a graphical representation of the angular position of a cutting plane in which a specific excitation center lies and the current cutting plane that can be scanned by the ultrasound applicator;
  • IG 8 is a 3D representation of the position of a specific excitation center and the position of the section plane which can be scanned at the moment.
  • FIG. 9 shows a side view of a device for the correct anatomical assignment of the excitation centers of biomagnetic signals.
  • FIG. 1 shows the position of a coordinate system Km with the coordinates xm, ym, zm, which is used to spatially represent the excitation centers measured by a SQUID system 2 (Superconducting Quantum Interference Device).
  • An ultrasound applicator 4 for transmitting and receiving ultrasound waves is arranged on a free end of a linkage 6. The ultrasound sectional images are recorded at the same location at which the biomagnetic measurements are also carried out.
  • the two coordinate systems Km and Ku are arranged to each other, a marking point 8, the position of which is known both in the coordinate system Km and in the coordinate system Ku, is indicated. It has the coordinates xml, yml, zml in the coordinate system Km and the coordinates xul, yul, perm in the coordinate system Ku.
  • a marking point 8 the position of which is known both in the coordinate system Km and in the coordinate system Ku. It has the coordinates xml, yml, zml in the coordinate system Km and the coordinates xul, yul, perm in the coordinate system Ku.
  • the two coordinate systems Km, Ku are arranged fixed to one another, then a calibration of the sensors is sufficient, regardless of their position relative to one another.
  • the two coordinate systems Km and Ku can be matched in position by calibrating the initial position of the angle and displacement sensors arranged in the linkage 6.
  • the position of the examination area must then remain unchanged when determining the image signals compared to the position of the examination area when determining the excitation locations.
  • the ultrasound device is portable and is removed from the shielded measuring chamber during the bio-magnetic measurement, so that the position of the marking points 8 in both coordinate systems Km, Ku are first determined.
  • marking points 8 at least three coils are glued to a surface of the examination area, for example the skin surface, which is accessible with the ultrasound applicator 4.
  • the coils are excited so that the location of the coils is known as marking points 8 in the coordinate system Km via the generated magnetic field using the biomagnetic measuring system.
  • the location of the coils is also determined in the coordinate system Ku. This takes place in such a way that the locations of the marking points 8 are approached before the ultrasound examination with an auxiliary mark 10 (shown in FIGS. 4 and 5) attached to the ultrasound applicator 4 or to the linkage 6.
  • These positions of the marking points 8 are then recorded in the coordinate system Ku, for example the measured values are accepted by the sensors at the push of a button.
  • the coordinates of the ultrasound applicator 4 in the coordinate system Ku with the coordinates xu, yu are continuously recorded with sensors attached to the linkage 6 and assigned to the coordinate system Km, in which the excitation centers of the biomagnetic signals, such as the excitation centers, for example an agnetocardiographic Examination (MKG excitation center) are specified.
  • the assignment takes place in such a way that one or more distinctive points in the coordinate system Km, hereinafter referred to as marking points 6, are brought into register with an excellent point of the ultrasound applicator 4, hereinafter referred to as auxiliary marking.
  • the position coordinates measured in the coordinate system Ku are stored and processed in a computer.
  • a volume 12 which contains the excitation centers of the biomagnetic signals, is then automatically scanned in many sectional planes 14 by hand or with the aid of servomotors.
  • FIG. 3 shows the volume scan for a parallel shift of sector scans.
  • the volume scan is recorded in chronological increments over a cardiac period. This means that a series of sectional images triggered by EKG are generated in each sectional plane, which reproduce the anatomical changes of this sectional plane during a cardiac period.
  • This volume information is now stored completely or only for a very specific heart phase.
  • the physiological excitation centers are now entered and displayed subsequently in the stored image of the spatially and temporally appropriate plane or in a new sectional plane calculated from the volume information.
  • This step consists of displaying a perspective model of the heart, which can be rotated and cut open with the aid of a CAD program loaded into a computer.
  • An ultrasound diagnostician familiar with ultrasound images now transfers the anatomical structure from the ultrasound image into the heart model by setting characteristic marks there for the corresponding section plane.
  • a variant C further limits the amount of data to be recorded by taking into account only one scanning plane 14 in which a specific excitation center is to be assigned to the anatomy.
  • a scanning plane containing the selected excitation center must be defined with computer means. Either the position coordinates of the scanning plane 14 are communicated to the automatic scanner or the examiner e.g. optically displayed so that the correct scanning level 14 is set.
  • the ultrasound applicator 4 is attached to a linkage 6 designed as a stand 16.
  • the ultrasound transducer 4 is suspended on the stand 16 in such a way that it can be rotated in all spatial directions xu, yu, controlled by hand or by actuating motors and displaced in translation.
  • the position of the ultrasound applicator 4 is determined by sensors so that the position of the scanned in this position
  • Section plane 14 in the coordinate system Ku is known. It is also possible to read the position of the ultrasound applicator 4 from scales and to enter them as coordinates into the ultrasound device by hand. If the positions can be changed via servomotors, then a complete volume scan or a restricted volume scan according to the second variant B can be carried out automatically.
  • the recording parameters can e.g. can be entered via a computer which also simultaneously ensures that the sectional plane coordinates in the coordinate system Ku are correctly assigned to the stored image.
  • FIG. 3 A possible realization of the stand 16 is given in FIG. 3.
  • a vertically arranged main cross member 20 is attached to a vertically arranged main support 18 in a height-adjustable manner.
  • a vertical movement of the main cross member 20 is possible and illustrated by a double arrow 22.
  • the main cross member 20 can also be moved in the horizontal position, which is indicated by a double arrow 24.
  • an L-shaped auxiliary support 26 is fastened in a rotatable manner.
  • the rotational mobility is illustrated by a curved double arrow 28.
  • a secondary cross member 30 is arranged laterally on the secondary support 26 on the secondary support 26.
  • the secondary beam 30 is similar to the main cross beam 20 in two mutually perpendicular positions wegungsraume ⁇ movably mounted, which is illustrated by a double arrow 32 and 34, respectively.
  • a bracket 36 is rotatably mounted.
  • the rotational mobility is illustrated by a curved double arrow 38.
  • the ultrasonic transducer 4 is now rotatably arranged on the free end of the holder 36, this is illustrated by a curved double arrow 40.
  • the axes of rotation which are marked by the double arrows 28, 38 and 40, are perpendicular to one another.
  • a further embodiment of a linkage 6, to which the ultrasound transducer 4 is fastened, is represented by an articulated arm 42 shown in FIG. 5.
  • This articulated arm 42 like the stand 16 according to FIG. 4, allows the ultrasound applicator 4 can be rotated and shifted translationally in all spatial directions by hand or controlled by motors, the spatial position being determined by sensors on the joints or by reading. It is therefore also possible, like the stand 16 according to FIG. 4, to carry out automatic volume scans with the aid of motor controls.
  • the articulated arm 42 according to FIG. 5 is rotatably mounted on a mounting plate 44. This rotary movement is to be illustrated by a curved double arrow 46.
  • a U-shaped bearing block 48 is rotatably mounted on the mounting plate 44.
  • a first articulated arm 50 is rotatably mounted between the legs of the bearing block 48, which is illustrated by a curved double arrow 56.
  • a second articulated arm 54 is rotatably attached, which is illustrated by a curved double arrow 56.
  • At the end of the articulated arm 50 is transverse fixed a shaft 58 on which a holder 60 is fixed.
  • the holder 60 on the shaft 58 can perform a rotary movement, which is identified by a curved double arrow 62.
  • a rotary arm 64 is rotatably mounted in the holder 60 in the direction of a curved double arrow 66.
  • the free end of the rotating arm 64 rotatably supports the ultrasonic transducer 4 in the direction of a curved double arrow 68.
  • the ultrasonic transducer 4 can be rotated in three mutually perpendicular axes of rotation .
  • the axes of rotation are identified here by the double arrows 62, 66 and 68. In this way, the ultrasound transducer 4 on the articulated arm 42 can also be easily rotated around a certain point in space.
  • each double arrow 22, 24, 28, 32, 34, 38, 40 in FIG. 4 and each double arrow 46, 52, 56, 62 is not shown in detail in FIGS. 66.
  • 68 in FIG. 5 is to indicate at the same time that the movement or change in position is detected by corresponding sensors when scanning or assigning the marking points 8 to the coordinate system Ku.
  • these double arrows are also intended to indicate the possibility of carrying out these movements in a controlled manner using servomotors, the illustration of which has also been omitted for reasons of clarity.
  • the point of contact of the ultrasound applicator 4 on the skin surface should be preferred as the fulcrum.
  • This enables simple handling when recording the sectional images.
  • Another, particularly convenient option is provided by non-mechanical position detection of the ultrasound applicator 4.
  • a possible realization is given by optical position recognition through pattern recognition, as is used in robot technology. The detection of the ultrasound applicator 4 and thus the possibility of its position determination, such as location and direction of the longitudinal axis of the transducer, is possible.
  • a further contactless measurement can be carried out by means of light-emitting diodes 70 shown in FIG. 6, which are attached to the ultrasound applicator 4 in a specific arrangement.
  • Different light-emitting diode arrangements 70 are distributed here over the circumference of the ultrasound applicator 4, so that a clear assignment to the cutting plane 14 scanned by the applicator 4 is possible.
  • the position of the light-emitting diodes 70 which light up in succession at fixed time intervals, can be easily recognized and determined by two television cameras or a camera and a mirror system, the mirror system replacing the second television camera.
  • the optical frequency of the camera and the light emitting diodes can be matched to one another.
  • the number and arrangement of the light-emitting diodes 70 can be selected redundantly, so that position detection of the applicator 4 by means of a computer is always possible by evaluating the recorded camera images, even if light-emitting diodes 70 are to be covered by the user's hand.
  • Another possibility for the contactless position determination of the ultrasound applicator 4 is given by a distance measurement, for example by an ultrasound range finder. In principle, it is a similar arrangement as in the case of the optical position determination with the aid of the light-emitting diodes 70.
  • Two or more transmitters can now be attached to the applicator 4, for example, which transmit at different frequencies and / or in succession.
  • catcher the position and direction of the axis of the ultrasonic applicator 4 can be determined.
  • the image points and their coordinates are saved at the same time with the aid of the computer in the case of automatic recordings, and the recording time e.g. which can be specified with regard to the heart phase.
  • the recording time e.g. which can be specified with regard to the heart phase.
  • a further possibility for data reduction in the case of a complete volume scan arises in a recording specified by hand.
  • the examiner determines the point in time when the ultrasound image is recorded, so that images are not recorded for all time phases. This can e.g. done with a button with which the recording time is determined. Appropriate help can be given to the examiner via an ECG triggering of the ultrasound device.
  • the coordinates are determined by optical readout, either the images recorded by the camera can be stored and later evaluated in the computer, or a position or coordinates can be determined immediately by evaluating the camera images, which leads to a considerable reduction in the amount of data , but requires a fast calculator for pattern recognition. If the position of the ultrasound applicator 4 is determined with the aid of the stand 16, the articulated arm 42 or by non-contact distance measurement, the measured applicator positions can also be transferred to a computer after reading by direct input. An automatic specification of the scanning planes 14 via the motor control is then no longer possible, because in this case there is no connection between the sensors and the motor control.
  • the heart can advantageously also be scanned using a transesophagus applicator.
  • the transesophagus applicator is equipped with at least three coils. By activating the coils, they act as magnetic dipoles, the position of which can be located by the biomagnetic measuring system. This is possible without relocating the patient from the biomagnetic measuring room, since the images can be recorded directly before or after the MKG measurements.
  • the procedure is as follows. After the applicator has been inserted, the coils are activated and the positions are determined by means of the biomagnetic system.
  • the image plane of the applicator 4 can now be shifted in a defined manner in the biomagnetic coordinate system Km and the sectional plane can then be scanned.
  • a volume scan according to variant A as well as a restricted volume scan according to variant B or only the scanning of a plane according to variant C is possible.
  • the image plane has to be displaced by means of a location measurement such that the excitation center sought lies in the image plane.
  • the calculation of the value by which distance the array in the transesophagus applicator has to be shifted can be done by the computer and can be output on a screen, for example.
  • the following procedure can be followed.
  • the ultrasound applicator 4 is placed at a point by which the origin of a sectional plane 14 is defined, identified by reference numeral 72 in FIG.
  • the rotation about the third axis is now calculated with the computer, so that the predetermined excitation center lies in the scanning plane 14.
  • the computer can, for example, be coupled to the ultrasound device in order to transmit the scan shape and the size and position of the image section. These parameters can also be entered into the computer manually.
  • the angle at which the ultrasound applicator 4 must be set can be output as a numerical value or graphically on a screen. For example, the deviation of the angle from the setpoint can be displayed in the graphic output.
  • FIG. 7 One possibility for this is given in FIG. 7.
  • an angle scale 74 the angle is given which the sectional plane must take in order to detect the center of excitation.
  • This target angle is provided with the reference numeral 76 in FIG.
  • the angular position of the current cutting plane 14 is indicated by a second mark 78 (actual angle).
  • the ultrasound applicator 4 is now rotated so that the two marks 76 and 78 coincide. This indicates that the angle matches. With this procedure, all other parameters are specified except for one angle.
  • FIG. 8 Another possibility for a graphic output is a 3D representation of the scan plane of the point to be searched. This is shown in FIG. 8, for example for a sector scan.
  • the 3D representation of the sectional plane 14 bears the reference symbol 80, the predetermined excitation center is identified by the reference symbol 82.
  • the ultrasound applicator 4 is rotated about the axes so that the excitation center 82 lies in the sectional plane 14 or 3D representation of the sectional plane 80. This can be particularly emphasized graphically on the screen by changing the point marking 82 when the excitation center comes to lie in the cutting plane.
  • the image can either be transferred to a computer and output there to an imager, the point being marked graphically by a character.
  • the excitation center 82 can be represented by corresponding characters directly in the ultrasound image of the device.
  • the two coordinate systems Km and Ku are fixed to one another.
  • the SQUID system or biomagnetic measuring system 2 already shown in FIG. 1 is movably arranged on a frame 90, so that the biomagnetic measuring system 2 can be brought close to the area of a patient to be examined and fixed there.
  • the coordinate origin of the coordinate system Km is detected by position and angle sensors installed in the frame 90. These displacement and angle sensors arranged in the frame 90 are symbolized by the arrows 92.
  • the scaffold 90 has a base plate 94 attached to a connection point 96.
  • the linkage 6 is also connected to the base plate 94 at a reference point 98 at a distance A from the scaffold.
  • the linkage 6 is formed here similar to the articulated arm 42 in Fig. 5 with the corresponding angle sensors.
  • the angle sensors initially detect the position of the ultrasound applicator 4 with respect to the reference point 98.
  • a patient table 100 is slidably arranged on the base plate 94, so that the patient table 100 is in a first end position 102 under the biomagnetic measuring system 2 and in a second end position 104 under the ultrasound applicator 4.
  • the displacement path which is arranged transversely to the longitudinal direction of the patient couch 100, is designated by delta L. Since the connection point 96 and the reference point 98 are now firmly arranged on the base plate 94, the angles and displacement sensors in the linkage 6 can be calibrated taking into account the displacement path delta L in such a way that the origins of the biomagnetic measuring system Km and of the Ku ultrasound system. It is also possible to calibrate the displacement and angle sensors 92 in the frame 90.
  • the patient couch 100 can also be firmly connected to the base plate.
  • the reference point 98 is arranged closer to the connection point 96 by the displacement path delta L.
  • the biomagnetic measuring system is then raised, so that the desired sectional images can be created with the ultrasound applicator 4 arranged on the linkage 6 without hindrance.
  • the linkage 6 is detachably fastened to the base plate 94 at the reference point 98.
  • the linkage 6 is then e.g. mobile and is only introduced in the biomagnetic measuring space for the production of the ultrasound sectional images and is connected to the base plate 94 at the reference point 98.

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Abstract

Un procédé pour l'établissement de correspondances anatomiques correctement localisées des centres d'excitation de signaux biomagnétiques comprend les opérations suivantes: les centres d'excitation, déterminés au moyen d'un système biomagnétique de mesure, des signaux biomagnétiques se trouvent dans un premier système de coordonées (Km); les signaux d'image obtenus au moyen d'un applicateur d'ultrasons (4) se trouvent dans un deuxième système de coordonnées (Ku); des points de repère (8) se trouvent dans la zone à examiner ou sur une surface accessible à l'applicateur d'ultrasons (4) de la zone à examiner, la position de ces points étant connue dans les deux systèmes de coordonnées (Km, Ku); les deux systèmes de coordonnées (Km, Ku) sont déplacés l'un par rapport à l'autre de telle manière que tous les points de repère (8) se recouvrent : chaque centre d'excitation est indiqué par un signe dans la représentation d'une image formée par ultrasons. Si la position de la zone à examiner lors du calcul des signaux d'image n'est pas modifiée par rapport à cette même position de la zone à examiner lors du calcul des points d'excitation, il suffit, lorsque les deux systèmes de coordonnées (Km, Ku) sont fixes l'un par rapport à l'autre, d'étalonner un système de coordonnées (par exemple Ku) relativement à l'autre système de coordonnées (par exemple Km). Les points de repères sont alors superflus.
PCT/DE1991/000731 1990-09-18 1991-09-16 Procede et dispositif pour l'etablissement d'une correspondance anatomique correctement localisee des centres d'excitation de signaux biomagnetiques WO1992004862A1 (fr)

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DE4029581A DE4029581A1 (de) 1990-09-18 1990-09-18 Verfahren zur ortsrichtigen anatomischen zuordnung der erregungszentren von biomagnetischen signalen
DEP4029581.8 1990-09-18

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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FR2694880A1 (fr) * 1992-07-31 1994-02-25 Univ Joseph Fourier Procédé de détermination de la position d'un organe.
WO1994018890A1 (fr) * 1993-02-26 1994-09-01 Siemens Aktiengesellschaft Combinaison de signaux d'electrocardiogramme et d'image ultrasonore

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DE102007046700A1 (de) * 2007-09-28 2009-04-16 Siemens Ag Ultraschallvorrichtung
DE102022206137A1 (de) 2022-06-20 2023-12-21 Auckland Uniservices Limited Ultraschallsystem, Verfahren zum Aufnehmen eines 3D- und/oder 4D-Ultraschallbilds, und Computerprogrammprodukt

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Publication number Priority date Publication date Assignee Title
EP0581704A1 (fr) * 1992-07-31 1994-02-02 Universite Joseph Fourier Procédé de détermination de la position d'un organe
FR2694881A1 (fr) * 1992-07-31 1994-02-25 Univ Joseph Fourier Procédé de détermination de la position d'un organe.
FR2694880A1 (fr) * 1992-07-31 1994-02-25 Univ Joseph Fourier Procédé de détermination de la position d'un organe.
US5447154A (en) * 1992-07-31 1995-09-05 Universite Joseph Fourier Method for determining the position of an organ
WO1994018890A1 (fr) * 1993-02-26 1994-09-01 Siemens Aktiengesellschaft Combinaison de signaux d'electrocardiogramme et d'image ultrasonore

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DE4029581A1 (de) 1992-03-19

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