WO1992017114A1 - Dispositif de cartographie d'ecoulement utilisant la correlation croisee d'un signal doppler - Google Patents

Dispositif de cartographie d'ecoulement utilisant la correlation croisee d'un signal doppler Download PDF

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Publication number
WO1992017114A1
WO1992017114A1 PCT/JP1992/000427 JP9200427W WO9217114A1 WO 1992017114 A1 WO1992017114 A1 WO 1992017114A1 JP 9200427 W JP9200427 W JP 9200427W WO 9217114 A1 WO9217114 A1 WO 9217114A1
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WIPO (PCT)
Prior art keywords
doppler
correlation
flow velocity
cross
signals
Prior art date
Application number
PCT/JP1992/000427
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English (en)
Japanese (ja)
Inventor
Yasuhito Takeuchi
Original Assignee
Yokogawa Medical Systems, 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 Yokogawa Medical Systems, Ltd. filed Critical Yokogawa Medical Systems, Ltd.
Publication of WO1992017114A1 publication Critical patent/WO1992017114A1/fr

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Classifications

    • 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

Definitions

  • the present invention relates to a flow mapping apparatus for obtaining a two-dimensional or three-dimensional distribution image of a flow velocity of blood or the like in a human body based on a cross-correlation of Doppler signals included in an ultrasonic echo. (Background technology)
  • ultrasonic transmission and reception to and from the subject are performed multiple times in the same direction, and this is obtained.
  • Multiple echo signal trains are subjected to MTI (Moving Target Indication) processing or cross-correlation processing to determine the distribution of sound waves transmitted and received by ultrasonic waves.
  • MTI Microving Target Indication
  • cross-correlation processing to determine the distribution of sound waves transmitted and received by ultrasonic waves.
  • Another type of flowcharting apparatus is to perform two-dimensional cross-correlation of image data of a B-mode image of a body between two temporally consecutive frames for each data of a small region. There is something. With this device, a true two-dimensional flow velocity distribution can be obtained, and the cross-correlation only applies to the image data of two frames, so good SZN flow mapping cannot be performed.
  • An object of the present invention is to provide a flow matting apparatus capable of obtaining a two-dimensional or three-dimensional flow velocity distribution image with good SZN.
  • the present invention is to simultaneously receive echo signals of a plurality of sound rays per ultrasonic transmission, extract Doppler signals from a plurality of sample volumes set next to each other on each sound ray, and connect the Doppler signals to each other.
  • the velocity components in the sound ray direction and in the direction perpendicular to the sound ray direction are obtained from the cross-correlation of.
  • Such processing is repeated while sequentially scanning the ultrasonic beam, and a two-dimensional or three-dimensional flow velocity in a predetermined area of the subject is newly added. An ⁇ / ⁇ distribution image is obtained.
  • FIG. 1 is a block diagram of an example of the present invention.
  • FIG. 2 is a diagram showing a basic form of flow velocity measurement according to the present invention.
  • FIG. 3 is a diagram showing an output signal of the cross-correlation.
  • FIG. 4 is a diagram showing two-dimensional flow velocity measurement. (Best mode for carrying out the invention)
  • reference numeral 1 denotes an ultrasonic transducer array for transmitting and receiving ultrasonic pulses for measuring the blood flow velocity of blood vessels 2 in the body.
  • sample volumes SV1, SV2, SV3, and SV4 are set in blood vessel 2.
  • the transducer array 1 transmits an ultrasonic beam having a thickness enough to include these four sample polymes.
  • Two sound rays A and B for echo reception are set within the range of the thickness of this transmitted ultrasonic beam.
  • Sample volumes SVI and SV2 are located on ray A, and sample volumes SV3 and SV are located on ray B.
  • dl and d2 are the distances on the sound ray from the center of the surface of the transducer array 1 to the sample volumes SVI, SV3 and SV2, SV4, respectively.
  • the echo signals are received simultaneously for sound ray A and sound ray B.
  • the Doppler signal power is extracted from the echoes from the four sample volumes SV1 to SV4. Then, Doppler signals in adjacent sample volumes are cross-correlated, and the two-dimensional flow velocity distribution force of the blood flow is obtained from the result.
  • the cross-correlation may be obtained in the following form.
  • the sample volume is also set in the y direction perpendicular to both the X and ⁇ axes, and the third sound ray C passing through it is also set, and the Doppler signal of that sample volume is also compared.
  • the velocity component in the y-direction can be determined. Then, it is possible to obtain a three-dimensional flow velocity distribution by vector synthesis of the flow velocity components in the three axis directions of X, y, z ⁇ > 0
  • the two-dimensional or three-dimensional distribution of the microscopic region is obtained. If a plurality of sample volumes are set on the sound rays A, B, and C over a desired range, the two-dimensional or three-dimensional The flow velocity distribution is obtained. Then, by scanning these sound rays in a desired range in the X or y direction, it is possible to obtain a flow velocity distribution image in a desired area or volume range.
  • Such flow mapping based on cross-correlation of Doppler signals can perform better SZN flow mapping than that based on two-dimensional cross-correlation between frames of B-mode image data as in the above-described conventional example.
  • the reason is as follows. That is, in extracting the Dobra signal, transmission and reception of ultrasonic waves are repeated a plurality of times in the same direction, and each time, the received echo signal is coherently detected and ranged by a boxcar integrator.
  • the technique of sampling range gated signals is widely used, but new paper
  • Doppler signal extraction is performed with good SZN.
  • the flow map is obtained by using the Doppler signal having a good SZN, so that the present invention can perform the flow matching with a good SZN.
  • FIG. 1 shows an embodiment of a flow matting apparatus based on the above principle.
  • This is an example of a two-dimensional flow mapping device.
  • reference numeral 11 denotes a transmission trigger generation circuit that generates a transmission trigger that is a reference of a transmission signal.
  • a transmission beamformer 12 receives the output signal of the transmission trigger generation circuit 11 and forms a beam for transmission.
  • the transmission beamformer 12 forms a slightly thick beam.
  • This output is amplified by the transmission signal circuit of the transmission / reception circuit 13 and transmitted from the probe array 1 as an ultrasonic pulse.
  • the transmission / reception circuit 13 is composed of a transmission signal circuit and a reception signal circuit, each of which is equal in number to the number of elements of the probe array 1.
  • Reference numeral 16 denotes a Doppler processing unit A including a detection circuit and a filter for processing data of the sound ray A
  • reference numeral 17 denotes a Doppler processing unit B for processing a received signal of the sound ray B.
  • Reference numeral 18 designates a range gate A which applies a gate to the signal of the sound ray A from the Doppler processing section A 16 at a position corresponding to the sample volume S VI to make the echo signal of the sample volume S V1 and the like ii.
  • reference numeral 19 denotes a range gate B that gates the signal of the sound ray A at a position corresponding to the sample volume SV2.
  • reference numerals 20 and 21 denote a range gate C and a range gate D, respectively, which gate the sound ray B at positions corresponding to the sample volumes S V3 and S V4.
  • 23 to 26 are boxcars for integrating the Doppler signals of the sample volumes SVI to SV4 in their respective range gates, and 27 to 3 ⁇ ⁇ are Doppler signals input from integrators 23 to 26, respectively.
  • a Doppler filter for removing unnecessary frequency ⁇ 3 ⁇ 4 of the signal, 31 to 34 are AD converters that convert digital signals from Doppler filters 27 to 30 to analog signals, 35 to 3
  • Reference numeral 8 denotes a memory for storing the outputs of the AD converters 31 to 34 for an appropriate time, and the signals are output as SI to S4.
  • 3 9 is new paper 4 no 1
  • a DSP Digital Signal Processor
  • a DSP Digital Signal Processor
  • the transmission trigger generator 1 The transmission trigger generator 1
  • New paper Generate a 5-cycle trigger pulse and input it to the transmit beamformer 12.
  • the transmission beamformer 12 forms a driving signal for forming a transmission beam thick enough to include at least the two sound rays ⁇ , ⁇ ; ⁇ , and forms a driving signal through a transmission / reception circuit 13.
  • Probe array 1 Transmits the corresponding ultrasonic pulse.
  • the signal is received by the echo signal force probe array 1, amplified by the transmission / reception circuit 13, and input to the reception beamformer 14.
  • the receiving beamformer 14 and the beam splitter 15 separate the signal received by the sound ray A and the signal received by the sound ray B.
  • the signal of the sound ray A is sent to the Doppler processing unit A16, and the signal of the sound ray B is sent to the Doppler processing unit A16.
  • the Doppler processing unit A 16 and the Doppler processing unit B 17 respectively perform processing such as coherent detection, amplification, and filtering of the input signal.
  • the Doppler processing unit A 16 inputs the signal of the sound ray A to the range gate A 18 and the range gate B 19, and the range gate pulse from the range gate pulse generation circuit 22 causes the sample volume S VI and the Outputs the echo signals of sample volume SV2 respectively.
  • the range gate C 20 and the range gate D 21 output echo signals of the sample volumes SV3 and SV4. These signals are respectively integrated by the integrators 23 to 26 for the period of the sample volume, and unnecessary frequencies are removed by the Doppler filters 27 to 30.
  • the Doppler signals of the sample volumes SVI to SV4, which are the outputs of the Doppler filters 27 to 30, are temporarily stored in the memories 35 to 38 after AD conversion, respectively.
  • the signals stored in the memories 35 to 38 are referred to as SI, S2, S3, and S4 in the order of the memory numbers.
  • These signals S1 to S4 are subjected to a cross-correlation calculation as shown in equations (1) and (2) in an operation notation 39, and the cross-correlation functions Cx and Cz are calculated as 2 of the flow velocity vector. Is output.

Abstract

Est décrit un dispositif de cartographie d'écoulement permettant d'obtenir une carte bi- ou tridimensionnelle de répartition de la vitesse d'écoulement, avec un excellent S/N. Des signaux d'écho des lignes sonores par transmission d'ondes ultrasonores sont simultanément reçus. Ensuite, des signaux Doppler sont extraits de plusieurs volumes-échantillons placés sur les lignes sonores respectives de manière à être adjacents les uns aux autres. Conformément à la corrélation croisée entre les signaux Doppler, on obtient des composantes de vitesse d'écoulement dans le sens des lignes sonores et dans le sens perpendiculaire à ces lignes. Tandis qu'un faisceau d'ondes ultrasonores est balayé en séquence, un tel processus se répète et on obtient la carte bi- ou tridimensionnelle de répartition de la vitesse d'écoulement par rapport à la région prédéterminée d'un corps subjectif.
PCT/JP1992/000427 1991-04-05 1992-04-06 Dispositif de cartographie d'ecoulement utilisant la correlation croisee d'un signal doppler WO1992017114A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP3/72744 1991-04-05
JP7274491A JPH04307040A (ja) 1991-04-05 1991-04-05 ドプラの相互相関フローマッピング装置

Publications (1)

Publication Number Publication Date
WO1992017114A1 true WO1992017114A1 (fr) 1992-10-15

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PCT/JP1992/000427 WO1992017114A1 (fr) 1991-04-05 1992-04-06 Dispositif de cartographie d'ecoulement utilisant la correlation croisee d'un signal doppler

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JP (1) JPH04307040A (fr)
WO (1) WO1992017114A1 (fr)

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6099237A (ja) * 1983-11-04 1985-06-03 三菱電機株式会社 超音波診断装置
JPS61100236A (ja) * 1984-10-08 1986-05-19 富士通株式会社 相関検出型超音波血流計
JPS61154650A (ja) * 1984-12-28 1986-07-14 株式会社　日立メデイコ 超音波診断装置
JPS61206432A (ja) * 1985-03-12 1986-09-12 富士通株式会社 相互相関型超音波血流計
JPS62152437A (ja) * 1985-12-26 1987-07-07 アロカ株式会社 超音波ドプラ診断装置
JPS62253039A (ja) * 1986-04-25 1987-11-04 株式会社　日立メデイコ 超音波血流速計測装置
JPS6417634A (en) * 1987-07-14 1989-01-20 Yokogawa Medical Syst Pulse doppler mti apparatus
JPS6480348A (en) * 1987-09-21 1989-03-27 Shigeo Otsuki Measurement of flow rate vector distribution using linear beam scanning
JPS6480349A (en) * 1987-09-21 1989-03-27 Shigeo Otsuki Measurement of flow rate vector distribution using shift sector beam scanning
JPH01145046A (ja) * 1987-12-01 1989-06-07 Shimadzu Corp 超音波ドップラー装置における血流画像形成方法
JPH0332653A (ja) * 1989-06-29 1991-02-13 Matsushita Electric Ind Co Ltd 超音波診断装置

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6099237A (ja) * 1983-11-04 1985-06-03 三菱電機株式会社 超音波診断装置
JPS61100236A (ja) * 1984-10-08 1986-05-19 富士通株式会社 相関検出型超音波血流計
JPS61154650A (ja) * 1984-12-28 1986-07-14 株式会社　日立メデイコ 超音波診断装置
JPS61206432A (ja) * 1985-03-12 1986-09-12 富士通株式会社 相互相関型超音波血流計
JPS62152437A (ja) * 1985-12-26 1987-07-07 アロカ株式会社 超音波ドプラ診断装置
JPS62253039A (ja) * 1986-04-25 1987-11-04 株式会社　日立メデイコ 超音波血流速計測装置
JPS6417634A (en) * 1987-07-14 1989-01-20 Yokogawa Medical Syst Pulse doppler mti apparatus
JPS6480348A (en) * 1987-09-21 1989-03-27 Shigeo Otsuki Measurement of flow rate vector distribution using linear beam scanning
JPS6480349A (en) * 1987-09-21 1989-03-27 Shigeo Otsuki Measurement of flow rate vector distribution using shift sector beam scanning
JPH01145046A (ja) * 1987-12-01 1989-06-07 Shimadzu Corp 超音波ドップラー装置における血流画像形成方法
JPH0332653A (ja) * 1989-06-29 1991-02-13 Matsushita Electric Ind Co Ltd 超音波診断装置

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