EP0047070A1 - Tête de balayage par secteur pour un système de formation d'images ultrasonores - Google Patents

Tête de balayage par secteur pour un système de formation d'images ultrasonores Download PDF

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Publication number
EP0047070A1
EP0047070A1 EP19810303555 EP81303555A EP0047070A1 EP 0047070 A1 EP0047070 A1 EP 0047070A1 EP 19810303555 EP19810303555 EP 19810303555 EP 81303555 A EP81303555 A EP 81303555A EP 0047070 A1 EP0047070 A1 EP 0047070A1
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EP
European Patent Office
Prior art keywords
transducer
axis
mirror
sonic
subject
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.)
Ceased
Application number
EP19810303555
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German (de)
English (en)
Inventor
Charles F. Hottinger
Jack R. Sorwick
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.)
Technicare Corp
Original Assignee
Technicare Corp
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
Priority claimed from US06/178,488 external-priority patent/US4330874A/en
Application filed by Technicare Corp filed Critical Technicare Corp
Publication of EP0047070A1 publication Critical patent/EP0047070A1/fr
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/18—Methods or devices for transmitting, conducting or directing sound
    • G10K11/26—Sound-focusing or directing, e.g. scanning
    • G10K11/35—Sound-focusing or directing, e.g. scanning using mechanical steering of transducers or their beams
    • G10K11/357—Sound-focusing or directing, e.g. scanning using mechanical steering of transducers or their beams by moving a reflector
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/18—Methods or devices for transmitting, conducting or directing sound
    • G10K11/20—Reflecting arrangements

Definitions

  • This invention relates to ultrasound imaging systems and applications, and more particularly to real time ultrasound.imaging systems employing a sector scan rationale.
  • U .S. Patent 4,177,679 to Soldner describes an ultrasound head wherein a mirror or reflector is stationary and situated for passing ultrasound energy to and from the body, and wherein one or more transducers rotate along a given perimeter outboard of the mirror. As the transducers, which face radially inward toward the mirror, pass through a portion of their circumferential path of travel, they are energized to exchange energy with the patient via the mirror.
  • the Soldner apparatus is large and complicated, employs numerous transducers (or if it employs few transducers, is speed limited), and involves a highly sensitive and suspect system of timing and exchange of control among the. respective transducers.
  • U.S. Patent 4,137,777 to Haverl et al. describes a system employing a fixed, curved transducer, and a mirror reflector which oscillates to-and-fro in a plane which is common with the plane being imaged, and with the axis between the transducer and the mirror.
  • the Haverl et al. scanner and system is accordingly large, cumbersome, mechanically inelegant, and unsuitable for applications involving compact apparatus.
  • U.S. Patent 4,110,723 to Hetz et al. involves a system employing an allied principle, wherein a cylindrical parabolic reflector is fixed, and at least one ultrasonic transducer is rotatably positioned in the focal line thereof for the transmission and receipt of ultrasound signals.
  • the Hetz et al. patent describes a system involving deficiencies similar to those of the Haverl et al. patent. So also does U.S. Patent 4,084,582 to Nigam, wherein a fixed transducer directs energy to a mirror which moves on an axis normal to those of .the incident rays.
  • U.S. Patents including 4,131,023 to Mezrich et al., 4,131,024 to Mezrich et al., 4,131,025 to Mezrich et al., and 4,168,628 to Vilkomerson, describe ultrasound imaging employing a fixed ultrasonic lens disposed between transducer and the patient.
  • U.S. Patent 4,037,465 to Cook et al. describes an ultrasonic probe system for inspection of tubes wherein an ultrasonic transducer directs energy toward an axially disposed mirror, and wherein the entire mechanism is translated in order to "scan" the walls of a tubular structure into which the probe is inserted.
  • an extremely compact yet effective mechanism arises from utilization of a fixed transducer for generating signals and receiving echoes along an axis which is not directed towards the patient, and in fact which typically is generally parallel with the surface of the patient's body.
  • a sonic reflector has a pivot fulcrum on the axis, the reflection surface facing the transducer for diverting energy between the transducer and the patient's body.
  • the reflection means is moved about the fulcrum to reflect sonic energy between the transducer and a plane in the subject such that beams between the reflection surface and the subject lie in a different spatial plane than do beams between the transducer and the subject.
  • the transducer means is annular or disc shaped and has a concave surface for generating, focusing and shaping sonic "beams" toward a mirror.
  • the mirror itself is flat and inclined at a 45° angle to the axis of the transducer.
  • a shaft, upon which the mirror is mounted, is coaxial with the transducer and the mirror surface, such that oscillation of the shaft results in a scanning of beams from the reflecting surface downwardly into the patient, and corresponding diverting of echoes from the patient back to the transducer.
  • Suitable positional encoding and motor drive mechanisms are provided to drive the shaft and thus the mirror, and to coordinate this action with the generation and receipt of signals at the transducer.
  • an axially oscillating sonic mirror is physically close to the driving mechanism therefor, and a fixed ultrasound transducer is placed at an outboard end of the scanner head.
  • a fixed ultrasound transducer is placed at an outboard end of the scanner head.
  • a compact. ; housing has a chamber therein, filled with sonically conductive fluid, and carrying a positionally fixed ultrasound transducer at an outward extremity.
  • a rotatable shaft penetrates the chamber, and carries thereon a coaxial circular mirror which is angularly disposed to the axis, and which is rotatable on the axis.
  • a motor preferably a servo controlled three phase motor, is belt coupled to the mirror shaft, and oscillates the mirror back and forth through a predetermined angle.
  • a positional encoding mechanism preferably an optical encoding wheel attached to the motor records position information for coordination of respective ultrasound beam to and from the transducer, and for consequent assembly of a composite sector image.
  • the principles of the present invention generally relate to utilization of a fixed transducer and of a sonic mirror or reflecting surface which moves in specified fashion relative to the fixed transducer. It follows, then, that specific motive mechanisms must be provided whereby the mirror is suitably rotated, oscillated, or otherwise movably displaced relative to the transducer.
  • the following disclosure includes embodiments wherein the Fmirror is located intermediate the transducer.and the motive source (Fig. 1), and wherein the transducer is located intermediate the mirror and the motive source (Fig. 2). It is to be noted that for various imaging needs, one approach or the other may be preferable.
  • a housing 105 defines therein a chamber 120, which carries a sonically conductive fluid, such as water.
  • a sonically conductive fluid such as water.
  • fluid within the chamber 120 may be provided with additives, such as alcohol, polymer based lubricant, or the like which tend to match the fluid to the sonic impedance of the body.
  • additives such as alcohol, polymer based lubricant, or the like which tend to match the fluid to the sonic impedance of the body.
  • the viscosity of the fluid is not critical, but for specific applications it may be useful to increase the viscosity of the fluid for purposes of damping spurious reverberation through the instrument.
  • a pair of leads 111 are connected to a round ultrasound transducer 100 constructed as is known in the art, for example, by successive layers of absorber backing 102, piezoelectric cystral 103, and matching layers such as 104 of glass, and 113 an epoxy front piece.
  • the transducer 100 is enclosed on the outboard side by an rf shield material 101, and is potted in a positionally fixed location in housing 105, such as by commercially available potting materials.
  • the transducer 100 employs a curved (i.e.
  • sonic energy generated as a consequence of electrical stimulation of the leads 111 comprises a focused travelling sonic wave, the focal characteristics of which will be dependent upon the desired depth of the image plane within the subject. That is, sonic energy from the transducer 100 is reflected by a sonic mirror 106, and thereby is folded downwardly toward the patient, and due to the focus characteristics of the transducer 100, the waves converge properly after exiting from the housing 105 as though the transducer was located directly thereabove.
  • the transducer 100 is circular in configuration and is centered on an axis 121, about which sonic wavefronts emitted by the transducer are likewise centered, and along which the sonic energy moves.
  • the rotation of the mirror 122 on axis 121, with transducer being stationary thereon, may be regarded as "relative torsional displacement".
  • An elastic diaphragm 130 allows for liquid thermal expansion and contraction. It will be understood that several such diaphragms may be employed, and located pursuant to the desires of the designer.
  • the chamber 120 also carries a sonic reflector means, basically including a low density mirror mount 114 onto which is fastened a sonic reflector 106, such as a disc of polished aluminum or glass.
  • the mirror 106 is circular in configuration and as shown is maintained at a predetermined angle (e.g., 45°) to the axis 121.
  • a predetermined angle e.g. 45°
  • sonic energy from the transducer is deflected by the mirror 106 downwardly through the chamber 120, out through sonically transparent section of the housing 105, and thereupon into the patient.
  • sonic echoes from the patient return to the chamber 120, and are deflected by the mirror back to the transducer, there to be converted to electrical signals on leads 111.
  • Fig. 1 the mirror 106 and mirror mount 114 are carried on a coaxial shaft 118.
  • a bayonet type locking ring 115, sealing 0 ring 108, and a dynamic seal 107 maintain fluid in the chamber 120.
  • a port 117 allows for introduction or withdrawal of fluid from the chamber 120.
  • Bearings 116 and 123, with retainer 118, allow for rotation or oscillation of the shaft 119 on the axis 121, and in turn the axial displacement of the mirror 106 relative to the fixed transducer.
  • Such motion is accomplished via a drive pulley 109, which is affixed to the shaft 119, and motor drive apparatus, not shown in Fig. 1.
  • central point 122 of mirror 106 which is located on axis 121 and in that sense renders the mirror 106 coaxial with the shaft 119 and with the transducer 100, essentially serves as a fulcrum for the motion of the mirror 106.
  • the mirror 106 correspondingly is moved.
  • Fig. 2 there is shown an alternative embodiment of the principles of the present invention.
  • the principal distinction between the embodiment of Figs. 1 and 2 is that, whereas in Fig. 1 the m-rror 106 is located intermediate the transducer 100 and a source of power via drive pulley 109, in Fig. 2 the transducer is located inboard of the mirror.
  • a circular transducer 200 and an elliptical mirror 203 are lccated coaxially to and facing one another on an axis 215. It will be understood that the transducer 200 is fabricated in a variety of fashions as is known in the art, for example in similar fashion to the one shown in Fig. 1.
  • the transducer is carried by a fixed mount 214, which in turn is carried on a positionally fixed shaft 201.
  • a channel 202 through the shaft 201 facilitates an electrical interconnection of the transducer 200 with power and signal sensing apparatus.
  • the mirror 203 is borne on a generally cylindrical mounting assembly 204, which in turn is affixed to a cylindrical, hollow shaft 205.
  • a drive belt 206 interconnects the shaft 205 with a source of rotational or oscillatory power, whereby the shaft 205, and with it the mirror mount assembly 204 and the mirror 203 itself, are oscillated or rotated about fulcrum point 216 and relative to the positionally fixed transducer 200.
  • the mirror 203 and transducer 200 are carried within a chamber 212 formed by housing 214, which chamber 212 is filled with sonically conductive fluid, as discussed hereinbefore.
  • a void or cutout 213 permits sonic energy deflected by the mirror to pass out of the chamber 212 through sonically transparent portion 214 of the housing, and likewise to permit echoes from the patient to impinge on mirror 203 and be reflected back to transducer 200.
  • a series of dynamic seals 207 and 208, as well as a static seal 209, maintain fluid within the chamber 212.
  • a series of bearings 217 facilitate rotational movement of the mirror 203 on axis 215, about fulcrum point 216.
  • FIG. 3A and 3B will facilitate appreciation of the utilization of the embodiments of Fig. 1 or Fig. 2 in a scanning head which may be conveniently manipulated by the ultrasonographer. That is, while the embodiment of Figs. 3A and 3B utilizes the sort of embodiment pictured in Fig. 1, it could as well utilize the sort of embodiment pictured in Fig. 2.
  • the transducer 302 is positionally fixed within a lower portion 313 of the head, which forms the fluid chamber 314 and which carries therein the movable mirror 303.
  • Mirror 303 is carried on a shaft 307, which is interconnected with a laterally displaced shaft 308 by means of a drive belt 306.
  • a motor 309 either oscillates shaft 308 back and forth, or rotates it, as preferred, and correspondingly brings about similar movement of the mirror 303.
  • transducer 302 For any given position of the mirror 303, there occurs a sonic wavefront from transducer 302, which is deflected by mirror 303 downwardly through sonic window 304 and, as shown symbolically at 312, into the body of the patient.
  • an echo signal train returns to the transducer 302 via the mirror 303.
  • the aggregate of these separate events is the assembly of a sector shaped image of the rotational plane in the body.
  • an encoder 310 is shown next adjacent the motor 309, which encoder 310 serves the function of positionally encoding the motion of motor 309 and in turn of mirror 303.
  • Such -positional information is important for production of an image display, by interrelating signals to and from the transducer 302.
  • the motor 309 may properly be embodied either as a continuous (e.g., three phase) motor or as a stepping or incremental motor.
  • the encoder 310 may be embodied by a Hall effect switch, or a continuous optical wheel type encoder and system such as described herein in conjunction with Fig. 5.
  • FIG. 4A shows a preferred form of the embodiment of the present invention shown in Fig. 1, employing an advantageous, and for many applications, superior physical structure.
  • Fig. 4A shows internal components in phantom, clearly designating the positioning of those components within a convenient and easily manipulated external housing.
  • transducer, mirror, power sources, and encoders yields an overall efficient, and reliable configuration.
  • Fig. 4A the chamber 403 bearing the transducer and mirror, is located in a lowermost, outwardly disposed section 412 of the unit, and that the motor and encoder (i.e.,'the drive means) is located in an upper section 414.
  • An intermediate section 413 interconnects upper section 414 with lower section 412, and provides for a transfer of power therebetween through the mechanism of a belt and pulley system.
  • Two elastic diaphragms (not shown in Fig. 4) occupy the lower section 412 for purposes of providing expansion space for the liquid within the chamber 403 to accommodate the liquid volume increase accompanying increases in liquid temperature above ambient.
  • a suitable grommet 415 provides a connection point for cables and the like whereby power, signal transmission and receipt, and the like are coupled to suitable imaging apparatus, as is known in the art. It is contemplated that the upper portion 414 defines a handle portion, which may be held by the user conveniently in one hand, while the lower portion 412, and most particularly a sonic window 405, is disposed against the body of the patient, with sonic energy being passed into, and received from the patient's body through the sonic window 405,
  • An axially rotatable mirror 402 is disposed just above the sonic window 405, the mirror being rotatable, preferentially in an oscillatory fashion, on a shaft 404 which penetrates the chamber 403 and which receives motive power by a drive belt and pulley system 406.
  • a transducer 401 faces the mirror 402, to emit ultrasound energy towards the mirror, which in turn is deflected into the patient through -window 405, and to receive ultrasound echoes which enter the chamber 403 through window 405, and are deflected by mirror 402 back to the transducer 401. It will be appreciated from Fig. 4A that the transducer 401 is located "outboard" of the mirror 402 relative to the source of motive power for the oscillation of the mirror 402.
  • the belt and pulley drive system 406 will be seen to exchange power between an upper shaft 407, emergent from a motor drive source 408, and the lower shaft 404 upon which the mirror 402 is carried.
  • the shaft 409 continues outward from the mirror 408 on the side opposite shaft portion 407, and into an encoder 411 which furnishes positional information concerning the shaft 409, and in turn the shaft 407, the belt and pulley system 406, the shaft 404, and ultimately the mirror 402.
  • encoder 411 continuously records positional information thereof, whereby the imaging system is able to coordinate the position of mirror 402 with ultrasound signals which are .emitted by transducer 401, and a corresponding echo signal train which is received by transducer 401.
  • the transmission and receipt of signals from transducer 401 occurs at a frequency far greater than the rate of motion of the mirror 402, such that the motion of mirror 402 through a predetermined sector (e.g., 90°) is effectively divided into increments, each increment corresponding to a firing of the transducer 401, and the substantially immediate receipt of a pulse echo train from the patient via the mirror 402.
  • a predetermined sector e.g. 90°
  • the aggregate of these respective pulse-echo combinations, through the sector of mirror motion, is the production of an image of the patient's body tissue through a corresponding sector.
  • Fig. 4C shows a cutaway side view of the lower portion 412 of the Fig. 4A apparatus, merely illustrating the circular form and relative sizes of transducer 401 and mirror 402.
  • the focusing character of the transducer 401 directs sonic energy onto the mirror 402, which as noted in cross-section in Fig. 4A, is disposed at a predetermined angle, preferably 45°, to the outboard transducer 401.
  • Fig. 4B merely shows an end view of the upper portion 414 of the Fig. 4A embodiment, demonstrating the cylindrical character thereof, and the consequent convenient form for manipulation or handling by the user thereof.
  • FIG. 5 there is shown a block diagram of a mechanical sector scanner imaging systen, with transducer 501 facing rotatable mirror 502.
  • the mirror 502 is located on a shaft from motor 503, which receives energizing control from a servomechanism reference and"feedback control 507.
  • the encoded positional information is coupled to signal conditioning circuitry 506, in order to present scaled information to the servo control 507.
  • signal conditioning circuitry 506 in order to present scaled information to the servo control 507.
  • Positional information is coupled from servo control 507 to a timing and control means 508.
  • line 519 also is coupled to the timing control unit 508 from the front panel controls.
  • the front panel controls at the discretion of the user, select frame rate, interlace or non-interlace options, overall sector angle, and the like parameters which dictate the size, granularity, and overall presentation of the sector being imaged.
  • the timing and control circuit 508 energizes pulser 409 to deliver electrical signal pulses to fire the transducer 501.
  • the sonic energy pulses from transducer 501 are deflected by mirror 502 into the subject.
  • the echoes from the subject are reflected from mirror 502 back to transducer 501.
  • the impinging of these echoes on transducer 501 is detected by a receiver 511:
  • the receiver receives a "TGC" control signal from the timing and control module 508.
  • TGC or time gain compensation, is a standard form of correction, arising because the amplitude of received pulses decreases exponentially as the function of the depth of the tissue from which the echoes have come.
  • a compensation or equalization to increase the amplitude of echoes in a given train as a function of elapsed time to account for the loss which actually occurs.
  • the corrected signals from the receiver 511 are coupled to a logarithmic amplifier 512, and thence to an analog to digital converter 514.
  • the amplifier 512 compresses the signal into a range which is appropriate for the gray scale being employed by-the system.
  • One method of display known as the "A mode" involves direct coupling of these signals to the display 513.
  • Such display mode involves a simultaneous display of the TGC signal.
  • the analog to digital converter 514 accomplishes suitable A to D conversion, typically utilizing a 5 or 6 bit code -(depending upon the gray scale being employed), and couples these words, preferably in a bit parallel fashion, to a memory 515.
  • the digital image memory 515 stores a composite image by appropriately locating the actual data from converter 514 in correspondence to the part of the body of the subject which is being displayed.
  • the digital image memory 515 receives coordination and control from the timing and control unit, whereby each word from converter 514 may be coupled to the proper location in the memory 515.
  • the servo control loop 507, 503, 502, 504, and 506, on an ongoing basis yields encoded information representing the angle of the mirror 502.
  • the current angle information may be utilized to place a digital word from memory 514 in correspondence to the beam directed from the mirror 502 into the subject.
  • the position of each individual word along that beam will be a function of the timing of the received pulse at 511, with respect to its generation from the transducer 501. Such timing is conducted on an ongoing basis at module 508.
  • the digital image memory appropriately addresses and stores each word from the coder 514.
  • the digital information in the memory 515 is coupled for display to and through a postprocessing unit 516, thence to a digital to analog converter 517, and to a display. 518.
  • the postprocessing function at 516 under control of program selection controls, enables allocation and variation of gray scales in accordance with transfer curves, in a fashion known in the art. Such operation may utilize,- as desired, a large variety of echo amplitude level versus display brightness level allocations, in order to enhance and/or supress certain desired echoes, or in order to emphasize or de-emphasize particular aspects of the displayed image.
  • preferred embodiments of the principles of the present invention utilize an optical encoder mounted directly on the motor shaft, in order continuously to maintain an accurate record of the position of the oscillating reflector.
  • an optical encoder mounted directly on the motor shaft, in order continuously to maintain an accurate record of the position of the oscillating reflector.
  • numerous commercial versions of such encoders are suitable, one which is preferred is that commercially available from Teledyne Gurley, Troy, New York under the designation Model 8602-69, Rotary Incremental Encoder.
  • the encoder involves a transparent disc upon which are printed three concentric rings of radial timing marks, individual ones of which are of a thickness, and a radial relationship with the marks of the other rings, to facilitate counting and sensing, and, by comparison of phase, direction of rotation. As shown in Fig.
  • each such ring has a light source 601, 602, and 603 on one side of the disc 600, and a light detector 604, 605 and 606 on the other, such that the light sources 601 through 603 are alternately exposed to and blocked from the detector 604 through 606 on the other side.
  • the central ring i.e., 602-605
  • the other two rings i.e., 601-604 and 603- 6 06) allow for the actual determination of speed, positioning, and direction of the disc 600.
  • signals from the detectors 604, 605, and 606, generally in the form of a "squashed" sine wave are respectively squared off at 6.07, 608, and 609, and are coupled to an edge detector 611.
  • the signals from the respective signal paths 607 and 609 are 90° out of phase with one another, such that as the edge detector 611 generates one pulse for each transition of either square wave from 607 and 609, there is produced a total of four pulses for each full cycle.
  • These pulses, together with the square waves themselves, are coupled to a phase comparator 612 which, as shown, produces three types of signals. First, assuming rotation in a given direction, a pulse is generated, for each transition noted by the edge detector, along the "forward" line 613.
  • a pulse is emitted on the "reverse" line 614.
  • the "index" line signal 615 is derived directly from the central ring detector 605, and indicates each full turn of the shaft.
  • the forward and reverse designations are coupled via signal conditioning circuit 506 of Fig. 5 to the servo control 507 and timing and control 508 units.
  • transducers such as are known in the art, such as annular arrays, properly spatially oriented linear arrays, and transducer-and-lens or transducer-and-mirror compound sonic sources.
  • other mirror movement schemes may be employed, whereby the mirror is moved or wobbled about the specified fulcrum-on-axis, but other than in pure rotational oscillation, the dispositive parameter being the character of movement of the mirror relative to the transducer-axis and to the patient.
  • numerous compound or multiple uses may be employed, such as for Doppler flow measurements by pairing two units side by side, and coordinating their operation.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
EP19810303555 1980-08-15 1981-08-04 Tête de balayage par secteur pour un système de formation d'images ultrasonores Ceased EP0047070A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US17848280A 1980-08-15 1980-08-15
US06/178,488 US4330874A (en) 1980-08-15 1980-08-15 Mechanical sector scanner head and power train
US178488 1980-08-15
US178482 1980-08-15

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EP0047070A1 true EP0047070A1 (fr) 1982-03-10

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0088620A2 (fr) * 1982-03-05 1983-09-14 Olympus Optical Co., Ltd. Sonde ultrasonique pour l'examen diagnostique de l'intérieur de cavités de corps
FR2565094A1 (fr) * 1984-06-01 1985-12-06 Synthelabo Sonde d'echographie a miroir oscillant de focalisation
EP0293004A2 (fr) * 1987-05-29 1988-11-30 Erwin Sick GmbH Optik-Elektronik Dispositif de surveillance à ultrasons
CN113567548A (zh) * 2021-06-04 2021-10-29 湖南汽车工程职业学院 用于大型曲面构件的手动超声相控阵扫查装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5212671A (en) * 1989-06-22 1993-05-18 Terumo Kabushiki Kaisha Ultrasonic probe having backing material layer of uneven thickness

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1100914A (fr) * 1954-03-08 1955-09-26 Acec Tête localisatrice pour traitements thérapeutiques par ultrasons
SU184000A1 (ru) * 1965-07-30 1966-07-09 А. Ф. Разумовский , Н. В. Бабкин Искательная ультразвуковая головка со сканированием фокального пятна по глубине
FR2410276A1 (fr) * 1977-11-23 1979-06-22 Cgr Ultrasonic Appareil d'examen echographique a miroir oscillant destine au diagnostic medical
EP0019793A2 (fr) * 1979-05-14 1980-12-10 New York Institute Of Technology Procédé de détermination de la vitesse de matière en mouvement, notamment dans le corps et dispositif pour cette détermination et pour la visualisation de parties du corps

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1100914A (fr) * 1954-03-08 1955-09-26 Acec Tête localisatrice pour traitements thérapeutiques par ultrasons
SU184000A1 (ru) * 1965-07-30 1966-07-09 А. Ф. Разумовский , Н. В. Бабкин Искательная ультразвуковая головка со сканированием фокального пятна по глубине
FR2410276A1 (fr) * 1977-11-23 1979-06-22 Cgr Ultrasonic Appareil d'examen echographique a miroir oscillant destine au diagnostic medical
EP0019793A2 (fr) * 1979-05-14 1980-12-10 New York Institute Of Technology Procédé de détermination de la vitesse de matière en mouvement, notamment dans le corps et dispositif pour cette détermination et pour la visualisation de parties du corps

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0088620A2 (fr) * 1982-03-05 1983-09-14 Olympus Optical Co., Ltd. Sonde ultrasonique pour l'examen diagnostique de l'intérieur de cavités de corps
EP0088620A3 (fr) * 1982-03-05 1984-12-12 Olympus Optical Co., Ltd. Sonde ultrasonique pour l'examen diagnostique de l'intérieur de cavités de corps
FR2565094A1 (fr) * 1984-06-01 1985-12-06 Synthelabo Sonde d'echographie a miroir oscillant de focalisation
EP0293004A2 (fr) * 1987-05-29 1988-11-30 Erwin Sick GmbH Optik-Elektronik Dispositif de surveillance à ultrasons
EP0293004A3 (fr) * 1987-05-29 1989-03-15 Erwin Sick GmbH Optik-Elektronik Dispositif de surveillance à ultrasons
CN113567548A (zh) * 2021-06-04 2021-10-29 湖南汽车工程职业学院 用于大型曲面构件的手动超声相控阵扫查装置
CN113567548B (zh) * 2021-06-04 2023-08-04 湖南汽车工程职业学院 用于大型曲面构件的手动超声相控阵扫查装置

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AU552262B2 (en) 1986-05-29
AU7407581A (en) 1982-02-18

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