EP1898794A4 - Procede et dispositif utilisables avec des mesures doppler dans des applications medicales - Google Patents

Procede et dispositif utilisables avec des mesures doppler dans des applications medicales

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Publication number
EP1898794A4
EP1898794A4 EP06745145A EP06745145A EP1898794A4 EP 1898794 A4 EP1898794 A4 EP 1898794A4 EP 06745145 A EP06745145 A EP 06745145A EP 06745145 A EP06745145 A EP 06745145A EP 1898794 A4 EP1898794 A4 EP 1898794A4
Authority
EP
European Patent Office
Prior art keywords
distance
doppler
display
along
distance ranges
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.)
Withdrawn
Application number
EP06745145A
Other languages
German (de)
English (en)
Other versions
EP1898794A2 (fr
Inventor
Dan Manor
Eli Levi
Adi Yosef
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.)
VIASYS IRELAND Ltd
Original Assignee
VIASYS IRELAND Ltd
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 VIASYS IRELAND Ltd filed Critical VIASYS IRELAND Ltd
Publication of EP1898794A2 publication Critical patent/EP1898794A2/fr
Publication of EP1898794A4 publication Critical patent/EP1898794A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
    • G01S15/50—Systems of measurement, based on relative movement of the target
    • G01S15/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
    • G01S15/586—Velocity or trajectory determination systems; Sense-of-movement determination systems using transmission of continuous unmodulated waves, amplitude-, frequency-, or phase-modulated waves and based upon the Doppler effect resulting from movement of targets
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
    • A61B8/06—Measuring blood flow
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
    • A61B8/46—Ultrasonic, sonic or infrasonic diagnostic devices with special arrangements for interfacing with the operator or the patient
    • A61B8/461—Displaying means of special interest
    • A61B8/463—Displaying means of special interest characterised by displaying multiple images or images and diagnostic data on one display
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
    • G01S15/50—Systems of measurement, based on relative movement of the target
    • G01S15/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
    • G01S15/582—Velocity or trajectory determination systems; Sense-of-movement determination systems using transmission of interrupted pulse-modulated waves and based upon the Doppler effect resulting from movement of targets
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
    • G01S7/52017—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00 particularly adapted to short-range imaging
    • G01S7/52053—Display arrangements
    • G01S7/52057—Cathode ray tube displays
    • G01S7/52058—Cathode ray tube displays displaying one measured variable; A-scan display
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
    • G01S7/52017—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00 particularly adapted to short-range imaging
    • G01S7/52053—Display arrangements
    • G01S7/52057—Cathode ray tube displays
    • G01S7/52074—Composite displays, e.g. split-screen displays; Combination of multiple images or of images and alphanumeric tabular information
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
    • G01S7/56—Display arrangements
    • G01S7/62—Cathode-ray tube displays
    • G01S7/6209—Cathode-ray tube displays providing display of one measured variable
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
    • G01S7/56—Display arrangements
    • G01S7/62—Cathode-ray tube displays
    • G01S7/6281—Composite displays, e.g. split-screen, multiple images

Definitions

  • the invention is generally in the field of medical techniques related to measurements of blood flow velocities, and relates to a method and apparatus for optimizing measurements and monitoring of Doppler signals.
  • Doppler effect for measurements of physiological signals in medical applications has been used for many years.
  • the Doppler effect has been used to measure blood flow velocities in cardiovascular circulation for assessment and diagnosis of a patient's condition.
  • application of Doppler technology for blood flow velocities is based on transmitting a beam with a special transducer, normally an ultrasound beam, into a patient's body and in a general direction towards the target blood vessel.
  • the beam is typically with a constant carrier frequency.
  • the beam is reflected by any moving particles that are along its path, and is returned to a receiver located in the transducer, with a frequency shift that is proportional to the component of the velocity of the moving particles in the direction of the beam.
  • the reflecting particles are typically the blood cells.
  • Medical Doppler devices are able to perform the required filtering and frequency transforms on the received signals, and display the resulting velocities or Doppler shift frequencies in a graphical manner whereby the X axis relates to time (typically in units of seconds), and the Y axis displays either the Doppler shift frequency (typically in units of Kilo Hertz) or the velocity (typically in units of centimeters per second).
  • the resulting display is called a spectrum analysis.
  • the blood vessel In most medical examinations for blood flow velocity measurements, and particularly during most non-invasive medical procedures, the blood vessel is not visible to an examiner. Hence, the examiner is required to aim the transducer and the transmitted beam towards a general direction of the assumed location of the blood vessel within the patient's body.
  • the vessel is typically identified when Doppler signals are received and a velocity or a Doppler shift frequency signal or spectrum is displayed.
  • the first mode is known as Continuous Wave Doppler (CW) and the second mode is known as Pulse Wave Doppler (PW).
  • CW Continuous Wave Doppler
  • PW Pulse Wave Doppler
  • a transducer With CW mode, a transducer normally houses two transmitting/receiving elements, whereby the first element (the transmitting element) continuously transmits a beam, and the second element functions as a receiver (the receiving element) and continuously receives reflected signals.
  • the received Doppler signals in CW mode reflect movement of particles from all sites along the path of the transmitted beam.
  • the main advantage of CW mode is the ability to receive Doppler signals rather quickly.
  • the examiner cannot discriminate between different blood vessels since the Doppler signals are received from all the blood vessels and other physiological movements that are along the path of the beam, and there is no specificity for a distance from the transducer.
  • the beam amplitude is normally required to be small in order to minimize the potential hazardous effects of tissue insonation, and therefore medical applications that require high beam penetration energy, such as penetration of the skull for transcranial velocity measurements, are very difficult.
  • the PW mode is an alternative Doppler solution to overcome the limitations of CW Doppler.
  • the transducer typically houses only a single transmitting/receiving element.
  • the transmitter sends bursts of waves, the bursts being composed of a several waveforms (a train of waveforms) with a given carrier frequency, and are repeated at another given frequency, the Pulse Repetition Frequency (PRF).
  • PRF Pulse Repetition Frequency
  • Doppler signals can be received from a defined distance from the transducer face, while the duration (or length) of the transmitted burst defines the size of the region along the beam from which signals are acquired (sample volume).
  • PW allows distance discrimination along the path of the transmitted beam. This feature is particularly advantageous when the examiner wants to discriminate between different blood vessels that cross the path of the transmitted beam, or to discriminate between various locations along a single vessel that lies in the direction of the beam, such as the Middle Cerebral Artery during a transcranial Doppler examination from a temporal approach.
  • the transmitted wave amplitude is normally allowed to be larger than that of the CW mode, thus allowing penetration of difficult regions such as the temporal bone.
  • the main limitation of PW mode is that the measurement procedure becomes rather difficult, since the user is now required not only to aim the transducer towards the assumed position of the blood vessel, but also to set a specific distance from the transducer face from which the Doppler signals are received from the sample volume. Thus, it is possible that the transducer direction is correct, but the set distance is incorrect and the examiner will not be able to appreciate this information.
  • Doppler systems offer the multigating option, which allows the examiner to simultaneously view several graphical displays of velocity spectrums, whereby each display shows the velocity spectrum obtained at a specific distance from the transducer's face.
  • the present invention provides a new method and apparatus for providing and displaying Doppler measurements to an examiner during a Doppler measurement procedure. This is particularly useful for measurements of blood flow velocities in blood vessels.
  • a novel Doppler examination mode utilizes the advantages of both the CW and PW modes in a single examination of blood flow velocities.
  • Doppler signal information from a plurality of successive locations or distances along a carrier beam, typically ultrasound, are integrated together and analyzed to present a Doppler signal from the respective distance range.
  • the pulse wave Doppler mode allows presentation of a Doppler signal from a single location along the beam, while the continuous wave Doppler mode presents Doppler data that is obtained from the face of the transducer and on to infinity.
  • the present invention provides various presentation modes, including a
  • Doppler display from a plurality of distance ranges and a main window display for a corresponding optimal signal obtained in one of these distance ranges.
  • a transducer is typically used in a PW Doppler mode, thus using a single element transducer.
  • the receiver is continuously open in between the transmitted wave bursts, receiving Doppler signals along the beam path, starting from practically the transducer face and until the maximal distance that is allowed by the active PRF.
  • the Doppler signals are acquired from multiple locations along the beam and until the maximal distance. In typical PW mode, one of these multiple locations is analyzed and graphically displayed as a velocity or Doppler shift spectrum.
  • location defines a specific distance from the face of the transducer, from which Doppler data is being acquired and analyzed. This data is displayed as a Doppler velocity spectrum that represents this specific distance.
  • distance range defines a plurality of locations starting at one specific distance from the face of the transducer, and ending at a second specific distance from the face of the transducer. A set distance range is used to describe a user defined distance range.
  • the minimal first specific distance allowed according to the present invention is the face of the transducer, whereas the maximal second specific distance is typically limited according to the active PRF.
  • the present invention allows for the user to selectively set one or more distance ranges of interest. Different sizes of ranges of interest can be defined, and even ranges that overlap each other. For comparison, the multigating option is unable to display Doppler velocity spectrum in a single graphical display from a set distance range, but rather can display Doppler velocity spectrum only from a given single specific location.
  • a graphical display of the velocity or Doppler shift spectrum is generated, that is composed of the integrated signals that are received from the plurality of locations that correspond to set distance range.
  • the selected range is set by the examiner to be the maximal allowed distance range
  • a Doppler signal that is similar in nature to the CW Doppler mode is obtained while working with basically the PW mode.
  • This invention allows use of one-element transducers, insonating higher energy PW Doppler bursts that can penetrate difficult locations, and have the potential to selectively discriminate signals from various locations along the beam, yet maintain the ability to view a graphical velocity spectrum display in a manner similar to that of the CW mode.
  • This invention is particularly advantageous during an insonation into a patient's body, whereby the user selects to start with a set distance range that is maximally open in order to quickly identify the location of the target blood vessel, and after optimizing the direction of the transducer towards the body viewing graphical spectrum displays of smaller, more specific distance ranges of interest along the beam.
  • the invention can be further advantageous when the examiner subdivides the selected maximal distance range into a selected number of graphical displays, each providing a spectrum display from a different selected distance range. During an examination, all of the graphical displays can show simultaneously the integrated velocity spectrums within each of these selected distance ranges, thus allowing the examiner to quickly identify and focus on the preferred range of interest.
  • the selected set distance ranges maybe such that in one or more ranges the Middle Cerebral Artery Doppler velocity spectrum is shown, and in a further distance range the bifurcation of the Middle and Anterior Cerebral Arteries is shown, and in an even further distance range the Doppler velocity spectrum typical to the Anterior Cerebral Artery is shown.
  • the examiner can thus quickly focus on the preferred range of interest and/or identify pathologies which may have been otherwise overseen with normal PW operation.
  • Doppler velocity spectrum display and the main Doppler velocity spectrum display of either a set range or a specific location may be in the form, but not limited to, a touch screen, whereby touching the range display of interest or clicking on it with a mouse or using a remote control results in an update of the main spectrum display to show the optimal velocity spectrum that corresponds to one of the distances that are included in the selected range of interest.
  • a pointer may be included to highlight the graphical spectrum display that correlates to the display presently shown in the main spectrum display.
  • an apparatus for use in analyzing and presenting Doppler data in a Doppler ultrasound system comprising: a controller configured to control at least one distance range from an ultrasound transducer along an ultrasound beam, said at least one distance range including a plurality of successive locations between a first distance along the ultrasound beam and a second distance along the ultrasound beam; and a display unit configured for displaying a Doppler signal spectrum representative of said plurality of locations within said at least one distance range in at least one display window, respectively.
  • the apparatus is preferably configured for defining a plurality of the distance ranges and simultaneously displaying the Doppler signal spectra within said distance ranges in a plurality of the display windows, respectively. At least some of the distance ranges may overlap. At least some of the distance ranges may be continuous along the ultrasound beam.
  • the display unit may be configured for displaying a characteristic Doppler signal spectrum corresponding to a single location within said at least one distance range. This characteristic Doppler signal spectrum is displayed in at least one separate graphical display. The characteristic Doppler signal spectrum may correspond to the single location within the plurality of distance ranges.
  • a method for use in analyzing and presenting Doppler data in a Doppler ultrasound system comprising: controlling at least one distance range from an ultrasound transducer along an ultrasound beam, said at least one distance range including a plurality of successive locations between a first distance along the ultrasound beam and a second distance along the ultrasound beam; ' and displaying a Doppler signal spectrum representative of said plurality of locations within said at least one distance range in at least one display window, respectively.
  • Fig. 1 shows the matrix of Doppler data that is obtained from a plurality of locations as a function of time
  • Fig. 2 shows an example of an integrated Doppler velocity spectrum display within a set range of distances Dl to D2;
  • Fig. 3 depicts one possible display mode of the velocity spectrums within set range distances in accordance with an embodiment of the invention.
  • Fig. 4 is a representation of a second possible display mode, whereby a main graphical display window of the velocity spectrum that correlates to the distance within one of the set ranges as displayed in Figure 2 is shown.
  • Fig. 1 is a schematic representation of the Doppler data that is acquired during Doppler measurements.
  • a plurality of signals is received from a plurality of locations j.
  • a signal, generally at 101, received from the first transmitted burst and at the first location is A y
  • the signal received from the second location is Ay + i, and so on until the maximal location n, corresponding to signal Ai j+n -
  • the signal that is received from the second transmitted burst and at the first location is A ⁇ + i j
  • at the second location is ⁇ 4 /+ i ⁇ + i, and so on until location n.
  • This process is repeated for each transmitted burst in a new row.
  • Each row, generally at 120, is a data vector that represents signals that are received from a specific single burst for all locations along the path of the beam.
  • Each column 121 represents signals that are received for one specific location as a function of time.
  • Typical data processing in the PW mode in order to display the Doppler velocity spectrum at one specific location requires mathematical operations on the received signals that are included in the data column 121 for said specific location.
  • Such mathematical operations may include data filtering and application of transformation methods to convert the data from the time domain to the frequency domain, with the output typically being a graphical representation of the Doppler velocity spectrum for said one location.
  • the set distance range is first defined between location Dl (108) and location D2 (105).
  • a new integration data column is generated, whereby each data point in the column that corresponds to a given burst represents the summation of data points between Dl and D2 for that specific burst.
  • the generation of this integration column can be performed at any stage of the mathematical operations.
  • the integration column can be generated before or after the filtering process, and before or after the time to frequency domain transformation.
  • the mathematical operations are continued in order on the integration column, with a resulting typically graphical display of the Doppler velocity spectrum for said set distance range.
  • Fig. 2 is a graphical display of the basic concept in accordance with the embodiment of the present invention.
  • a Doppler velocity waveform or spectrum 104 is displayed in a graphical window 102, and represents an integration of the Doppler signal that is acquired from a plurality of locations within the set distance range between locations Dl 108 and D2 105.
  • Dl and D2 are measured from the face of the transducer and along the transmitted beam as previously described.
  • the beam used in many medical applications is typically an ultrasound beam.
  • the waveform shown in Fig. 2 is by way of example only, and can represent a full velocity or Doppler shift spectrum analysis as is typical with many Doppler systems.
  • Fig. 3 represents an extension of the display in Fig. 2, and depicts another possible display that may be typical for the representation of Doppler signals in accordance with the present invention.
  • a plurality of set distance ranges Dl 108 to D6 109 is shown.
  • a plurality of graphical display windows 102 is shown, each displaying the Doppler velocity spectrum that is generated based on the integration of the Doppler signals from a plurality of locations within the respective set distance range described above.
  • Each window 102 corresponds to the respective set distance ranges Dl to D6, such that the first graphical window displays the integrated Doppler signal that is obtained from locations Dl 108 to D2 105, and so on until the maximal displayed distance D6 109.
  • An accompanying bar 106 or tic marks, or generally any other graphical form of display, can accompany the display in order to show the respective distance ranges for each graphical window 102.
  • the Doppler velocity waveform or spectrum 104 is typically different in magnitude and shape for each graphical window.
  • the selection of five graphical windows in the figure between Dl and D6 is by means of example only.
  • Dl is typically the distance that is the closest to the transducer face, while D6 is typically the distance that is farthest from the transducer face and along the beam path.
  • the set distance ranges are continuous. However, the invention allows an overlap in the selected distance ranges, or some discontinuity in the set distance ranges.
  • Fig. 4 represents an even further extension of the display in Figs. 2 and 3, and depicts another possible display that may be typical for the representation of Doppler signals in accordance with the present invention.
  • This display may be most useful to an examiner that wishes to focus on a specific location as in the PW mode, yet aim the transducer and make examination decisions as in the CW mode and in accordance with the present invention.
  • a main graphical display window 110 is included in the display. This main window will typically be larger in size relative to the range display windows 102 since it typically displays Doppler velocity waveform or spectrum 112 measurements from the target location.
  • the display 110 could possibly display the integrated Doppler signals from a set distance range, for instance the distance between D4 and D5 in the example given here, the more common embodiment will be of a Doppler velocity or spectrum signal from a specific location as is common during the PW mode.
  • the specific location lies between D4 and D5, and its respective location is further depicted by an arrow or marker 113.
  • a specific indicator of the location (depth xx) 115 can be related to the main window 110.

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  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Surgery (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Biophysics (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
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  • Radiology & Medical Imaging (AREA)
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  • Veterinary Medicine (AREA)
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  • General Health & Medical Sciences (AREA)
  • Acoustics & Sound (AREA)
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  • Ultra Sonic Daignosis Equipment (AREA)

Abstract

Cette invention concerne un nouveau procédé et un nouveau dispositif utilisables pour analyser et présenter des données Doppler dans un système à ultrasons à effet Doppler. Au moins une gamme de distances depuis un transducteur à ultrasons le long d'un faisceau ultrasonore est commandée. Cette gamme de distances comprend plusieurs emplacements successifs entre une première distance le long du faisceau ultrasonore et une seconde distance le long de ce même faisceau ultrasonore. Un spectre de signaux Doppler représentant les multiples emplacements à l'intérieur de ladite gamme de distances est affiché dans au moins une fenêtre d'affichage.
EP06745145A 2005-06-14 2006-06-14 Procede et dispositif utilisables avec des mesures doppler dans des applications medicales Withdrawn EP1898794A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US69009605P 2005-06-14 2005-06-14
PCT/IL2006/000688 WO2006134595A2 (fr) 2005-06-14 2006-06-14 Procede et dispositif utilisables avec des mesures doppler dans des applications medicales

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EP1898794A2 EP1898794A2 (fr) 2008-03-19
EP1898794A4 true EP1898794A4 (fr) 2009-02-25

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EP (1) EP1898794A4 (fr)
JP (1) JP2008543415A (fr)
KR (1) KR101247520B1 (fr)
CN (1) CN101277649A (fr)
WO (1) WO2006134595A2 (fr)

Families Citing this family (2)

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Publication number Priority date Publication date Assignee Title
KR101023654B1 (ko) * 2008-09-29 2011-03-25 주식회사 메디슨 다수의 도플러 모드를 동시에 처리하는 초음파 시스템 및 방법
US20130184580A1 (en) * 2012-01-13 2013-07-18 General Electric Company Color flow image and spectrogram ultrasound signal sharing

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Publication number Priority date Publication date Assignee Title
US6217519B1 (en) * 1997-03-25 2001-04-17 Dwl Elektronische Systeme Gmbh Device and method for observing vessels, specially blood vessels
US6423006B1 (en) * 2000-01-21 2002-07-23 Siemens Medical Solutions Usa, Inc. Method and apparatus for automatic vessel tracking in ultrasound systems
GB2361538A (en) * 2000-04-19 2001-10-24 Robert Skidmore Sensing apparatus and method
WO2005006952A2 (fr) * 2003-07-10 2005-01-27 Spentech, Inc. Procede et appareil a effet doppler de surveillance du debit sanguin et des conditions hemodynamiques

Also Published As

Publication number Publication date
KR20080057216A (ko) 2008-06-24
WO2006134595A3 (fr) 2007-06-21
WO2006134595A2 (fr) 2006-12-21
KR101247520B1 (ko) 2013-03-26
JP2008543415A (ja) 2008-12-04
EP1898794A2 (fr) 2008-03-19
CN101277649A (zh) 2008-10-01

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