JPH0131977Y2 - - Google Patents
Info
- Publication number
- JPH0131977Y2 JPH0131977Y2 JP1982079168U JP7916882U JPH0131977Y2 JP H0131977 Y2 JPH0131977 Y2 JP H0131977Y2 JP 1982079168 U JP1982079168 U JP 1982079168U JP 7916882 U JP7916882 U JP 7916882U JP H0131977 Y2 JPH0131977 Y2 JP H0131977Y2
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- carrier wave
- divided
- oscillation pulse
- doppler
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000010355 oscillation Effects 0.000 claims description 26
- 230000005540 biological transmission Effects 0.000 claims description 7
- 230000005284 excitation Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 230000003252 repetitive effect Effects 0.000 description 3
- 238000002604 ultrasonography Methods 0.000 description 3
- 230000017531 blood circulation Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000002592 echocardiography Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Landscapes
- Ultra Sonic Daignosis Equipment (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Description
【考案の詳細な説明】
本考案は超音波ドプラ装置、特に主発振器から
発振された発振パルスに基づき超音波パルスビー
ムを被検体に送受波し被検体各部の動きをドプラ
信号として検出する超音波ドプラ装置に関する。[Detailed description of the invention] The present invention is an ultrasonic Doppler device, in particular, an ultrasonic Doppler device that sends and receives an ultrasonic pulse beam to and from a subject based on oscillation pulses oscillated from a main oscillator, and detects the movement of each part of the subject as a Doppler signal. Regarding Doppler equipment.
超音波パルスビームを被検体中に照射し、被検
体各部からの反射エコーに基づいて各部の動きを
ドプラ信号として検出する超音波ドプラ装置が周
知であり、例えば、被検体中の血行動態検査に際
して、超音波血流計として体表から任意の深度に
おける血流速度を測定する超音波診断装置に実用
化されている。 Ultrasonic Doppler devices that irradiate an ultrasonic pulse beam into a subject and detect the movement of each part of the subject as Doppler signals based on echoes reflected from each part of the subject are well known. , has been put into practical use as an ultrasonic blood flow meter that measures blood flow velocity at any depth from the body surface.
そして、超音波パルスビームの照射は数ｋHzの
送信繰返し信号にて数ＭHzの搬送波を変調して得
られた励振信号に基づいて行われるが、超音波血
流計の超音波送受信器および超音波振動子等は有
限の周波数帯域を有するので、高調波による悪影
響を防止するため、上記搬送波の周波数を送信繰
返し信号の周波数の整数倍とする必要がある。 Irradiation of the ultrasonic pulse beam is performed based on an excitation signal obtained by modulating a carrier wave of several MHz with a transmission repetition signal of several kHz. Since a vibrator or the like has a finite frequency band, the frequency of the carrier wave needs to be an integral multiple of the frequency of the transmitted repetitive signal in order to prevent the adverse effects of harmonics.
このため、従来の超音波ドプラ装置において
は、第１図に示すように、主発振器１０にて発振
された発振パルス１００をフリツプフロツプ回路
の組合せからなる第１の分周器である分周器１２
にて数ＭHzに分周し、この分周された発振パルス
１００を搬送波１０２として用いるとともに、こ
れを第２の分周器である分周器１４にて再び数ｋ
Hzに分周し、この分周された発振パルス１００を
送信繰返し信号１０４として用い、搬送波１０２
の周波数を送信繰返し信号１０４の周波数の整数
倍としていた。 For this reason, in the conventional ultrasonic Doppler apparatus, as shown in FIG.
The divided oscillation pulse 100 is used as a carrier wave 102, and the frequency is divided into several MHz by a second frequency divider 14.
Hz, and the frequency-divided oscillation pulse 100 is used as the transmission repetition signal 104, and the carrier wave 102 is
The frequency of the transmission repetition signal 104 was set to be an integral multiple of the frequency of the transmission repetition signal 104.
しかしながら、従来装置においては、上述した
ように、分周器１２にて分周された発振パルス１
００が搬送波１０２として用いられていたので、
任意周波数の発振パルス１００を搬送波１０２と
して選択することができないという欠点があつ
た。例えば、主発振器１０から発振された周波数
10MHzの発振パルス１００を１／2n（ｎは任意整
数）毎に分周を行う分周器１２にて分周した場
合、5MHz，2.5MHz，1.25MHzの３種類の発振パ
ルス１００しか搬送波１０２として選択すること
ができないこととなる。 However, in the conventional device, as described above, the oscillation pulse 1 divided by the frequency divider 12
Since 00 was used as the carrier wave 102,
There was a drawback that the oscillation pulse 100 of an arbitrary frequency could not be selected as the carrier wave 102. For example, the frequency oscillated from the main oscillator 10
When 100 oscillation pulses of 10 MHz are frequency-divided by the frequency divider 12 that divides the frequency by 1/2 n (n is an arbitrary integer), only three types of oscillation pulses 100 of 5 MHz, 2.5 MHz, and 1.25 MHz can be generated on the carrier wave 102. This means that it cannot be selected as such.
従つて、従来装置においては、搬送波１０２の
周波数を超音波振動子の共振周波数と一致させる
ことができず、ドプラ信号の検出感度を向上させ
ることができないという欠点があつた。 Therefore, in the conventional device, the frequency of the carrier wave 102 cannot be made to match the resonance frequency of the ultrasonic transducer, and the detection sensitivity of the Doppler signal cannot be improved.
また従来装置においては、被検体の運動速度に
応じて搬送波１０２の周波数を変えることができ
ず、測定精度を向上させることができないという
欠点があつた。 Furthermore, the conventional apparatus has the drawback that the frequency of the carrier wave 102 cannot be changed in accordance with the movement speed of the subject, and measurement accuracy cannot be improved.
本考案は前述した従来の課題に鑑みなされたも
ので、その目的は任意周波数の搬送波を選択する
ことによりドプラ信号を高感度で検出することが
でき、測定精度を向上させることができる超音波
ドプラ装置を提供することにある。 The present invention was developed in view of the conventional problems mentioned above, and its purpose is to detect Doppler signals with high sensitivity by selecting a carrier wave of an arbitrary frequency, and to improve measurement accuracy. The goal is to provide equipment.
上記目的を達成するため、本考案は主発振器か
ら発振された発振パルスを第１の分周器と第２の
分周器により所定周波数に分周し、該分周した送
信繰返し信号にて搬送波を変調して得られた励振
信号に基づき超音波パルスビームを被検体中に照
射し、その反射エコーに基づいて被検体各部の動
きをドプラ信号として出力する超音波ドプラ装置
において、前記第１の分周器により分周された発
振パルスの周波数を任意整数倍に逓倍する周波数
逓倍回路を有し、上記任意整数倍に逓倍された発
振パルスを搬送波として用いることを特徴とす
る。 In order to achieve the above object, the present invention divides the oscillation pulse oscillated from the main oscillator into a predetermined frequency using a first frequency divider and a second frequency divider, and uses the divided transmission repetition signal to generate a carrier wave. In the ultrasonic Doppler apparatus that irradiates an ultrasonic pulse beam into a subject based on an excitation signal obtained by modulating the It is characterized in that it has a frequency multiplier circuit that multiplies the frequency of the oscillation pulse divided by the frequency divider by an arbitrary integer, and uses the oscillation pulse multiplied by the arbitrary integer as a carrier wave.
以下図面に基づいて本考案の好適な実施例を説
明する。 Preferred embodiments of the present invention will be described below based on the drawings.
第２図には、本考案に係る超音波ドプラ装置の
好適な実施例が示されており、図において、主発
振器１０から発振された数ＭHzの周波数sを有す
る発振パルス１００は分周器１２にて１／Ｍ倍に
分周され、更に分周器１４にて１／Ｎ倍に分周さ
れ、数ｋHzの周波数r（r＝s・１／Ｍ・Ｎ）を有
す
る発振パルス１００が送信繰返し信号１０４とし
て用いられる。 FIG. 2 shows a preferred embodiment of the ultrasonic Doppler apparatus according to the present invention. The frequency is divided by 1/M times by the frequency divider 14, and the frequency is further divided by 1/N times by the frequency divider 14, and an oscillation pulse 100 having a frequency r (r=s・1/M・N) of several kHz is transmitted. It is used as a repetitive signal 104.
本考案において特徴的なことは、前記第１の分
周器により分周された発振パルスの周波数を任意
整数倍に逓倍する周波数逓倍回路を有し、該周波
数逓倍回路にて任意整数倍に逓倍された発振パル
スを搬送波として用いることである。 A feature of the present invention is that it has a frequency multiplier circuit that multiplies the frequency of the oscillation pulse divided by the first frequency divider by an arbitrary integer multiple, and the frequency multiplier circuit multiplies the frequency by an arbitrary integer multiple. This is to use the generated oscillation pulse as a carrier wave.
すなわち、分周器１２の出力側には、位相を追
従しながら逓倍率Ｌ（Ｌは任意整数）で逓倍する
位相追従型周波数逓倍回路１６が設けられ、この
位相追従型周波数逓倍回路１６はPLL（Phase−
locked loop）回路１８と分周器２０とを有して
いる。そして、電源投入時において、PLL回路
１８からは連続的に周波数が変動する可変周波数
発振パルス１０６が出力され、該可変周波数発振
パルス１０６は分周器２０にて１／Ｌ倍に分周さ
れてPLL回路１８に返還供給される。そして、
分周器１２，２０からそれぞれ出力された発振パ
ルス１００，１０８の位相はPLL回路８にて比
較され、その位相差が一定値に達したところで位
相が固定され、所定周波数s×Ｌ／Ｍの発振パルス
１０６がPLL回路１８から出力される。 That is, the output side of the frequency divider 12 is provided with a phase-following frequency multiplier circuit 16 that multiplies the signal by a multiplication factor L (L is an arbitrary integer) while tracking the phase. (Phase−
(locked loop) circuit 18 and a frequency divider 20. When the power is turned on, the PLL circuit 18 outputs a variable frequency oscillation pulse 106 whose frequency varies continuously, and the variable frequency oscillation pulse 106 is divided by 1/L by the frequency divider 20. The signal is returned to the PLL circuit 18. and,
The phases of the oscillation pulses 100 and 108 output from the frequency dividers 12 and 20, respectively, are compared in the PLL circuit 8, and when the phase difference reaches a certain value, the phase is fixed, and the phase is fixed at a predetermined frequency s×L/M. Oscillation pulse 106 is output from PLL circuit 18.
従つて、PLL回路１８から出力された所定周
波数s・Ｌ／Ｍの発振パルス１０６が搬送波１０２
として用いられ、例えば、分周器１２にて分周さ
れた発振パルス１００の周波数を100kHzとする
と、例えば、逓倍率Ｌ＝10，11，12……100の中
から任意の逓倍率Ｌを選定することにより、搬送
波１０２の周波数c＝1MHz，1.1MHz，1.2MHz
……10MHzの100kHz毎の周波数から任意に選択
することができる。この結果、本考案によれば搬
送波１０２の周波数cを超音波振動子の共振周波
数と一致させることができ、ドプラ信号の検出感
度を向上させることができる。また本考案によれ
ば、被検体の運動速度に応じて搬送波１０２の周
波数cを変えることができ、測定精度を向上させ
ることができる。 Therefore, the oscillation pulse 106 of a predetermined frequency s·L/M output from the PLL circuit 18 is used as the carrier wave 102. For example, if the frequency of the oscillation pulse 100 divided by the frequency divider 12 is 100kHz, For example, by selecting an arbitrary multiplication factor L from among multiplication factors L=10, 11, 12...100, the frequency c of the carrier wave 102 is 1MHz, 1.1MHz, 1.2MHz.
...Any frequency can be selected from 10MHz every 100kHz. As a result, according to the present invention, the frequency c of the carrier wave 102 can be made to match the resonance frequency of the ultrasound transducer, and the detection sensitivity of the Doppler signal can be improved. Further, according to the present invention, the frequency c of the carrier wave 102 can be changed depending on the movement speed of the subject, and measurement accuracy can be improved.
以上説明したように、本考案によれば、前記第
１の分周器の出力する発振パルスの周波数を任意
整数倍に逓倍する周波数逓倍回路を有し、上記任
意整数倍に逓倍された発振パルスを搬送波として
用いることにより、ドプラ信号を高感度で検出す
ることができ、測定精度を向上させることができ
る。 As explained above, according to the present invention, there is provided a frequency multiplier circuit that multiplies the frequency of the oscillation pulse outputted from the first frequency divider by an arbitrary integer, and the oscillation pulse is multiplied by the arbitrary integer. By using the Doppler signal as a carrier wave, the Doppler signal can be detected with high sensitivity, and measurement accuracy can be improved.
第１図は従来の超音波ドプラ装置のブロツク回
路図、第２図は本考案に係る超音波ドプラ装置の
好適な実施例を示すブロツク回路図である。
１０……主発振器、１２，１４，２０……分周
器、１６……位相追従型周波数逓倍回路、１８…
…PLL回路、１００……発振パルス、１０２…
…搬送波、１０４……送信繰返し信号、１０６…
…可変周波数発振パルス。
FIG. 1 is a block circuit diagram of a conventional ultrasound Doppler device, and FIG. 2 is a block circuit diagram showing a preferred embodiment of the ultrasound Doppler device according to the present invention. 10... Main oscillator, 12, 14, 20... Frequency divider, 16... Phase tracking type frequency multiplier circuit, 18...
...PLL circuit, 100...Oscillation pulse, 102...
...Carrier wave, 104... Transmission repetitive signal, 106...
...Variable frequency oscillation pulse.
Claims (1)
周器と第２の分周器により所定周波数に分周し、
該分周した送信繰返し信号にて搬送波を変調して
得られた励振信号に基づき超音波パルスビームを
被検体中に照射し、その反射エコーに基づいて被
検体各部の動きをドプラ信号として検出する超音
波ドプラ装置において、前記第１の分周器により
分周された発振パルスの周波数を任意整数倍に逓
倍する周波数逓倍回路を有し、上記任意整数倍に
逓倍された発振パルスを搬送波として用いること
を特徴とする超音波ドプラ装置。 The oscillation pulse oscillated from the main oscillator is divided into a predetermined frequency by a first frequency divider and a second frequency divider,
The ultrasonic pulse beam is irradiated into the subject based on the excitation signal obtained by modulating the carrier wave with the frequency-divided transmission repetition signal, and the movement of each part of the subject is detected as a Doppler signal based on the reflected echo. The ultrasonic Doppler apparatus includes a frequency multiplier circuit that multiplies the frequency of the oscillation pulse divided by the first frequency divider by an arbitrary integer, and uses the oscillation pulse multiplied by the above-mentioned arbitrary integer as a carrier wave. An ultrasonic Doppler device characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7916882U JPS58182172U (en) | 1982-05-31 | 1982-05-31 | ultrasound doppler device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7916882U JPS58182172U (en) | 1982-05-31 | 1982-05-31 | ultrasound doppler device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58182172U JPS58182172U (en) | 1983-12-05 |
| JPH0131977Y2 true JPH0131977Y2 (en) | 1989-10-02 |
Family
ID=30088364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7916882U Granted JPS58182172U (en) | 1982-05-31 | 1982-05-31 | ultrasound doppler device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58182172U (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59160448A (en) * | 1983-02-21 | 1984-09-11 | 富士通株式会社 | Ultrasonic diagnostic apparatus |
| JPS6395036A (en) * | 1986-10-09 | 1988-04-26 | アロカ株式会社 | Ultrasonic doppler measuring apparatus |
| JP2001147265A (en) * | 1999-11-22 | 2001-05-29 | Koden Electronics Co Ltd | Ultrasonic survey device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5640124A (en) * | 1979-09-10 | 1981-04-16 | Tokyo Shibaura Electric Co | Ultrasonic doppler blood stream meter |
-
1982
- 1982-05-31 JP JP7916882U patent/JPS58182172U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5640124A (en) * | 1979-09-10 | 1981-04-16 | Tokyo Shibaura Electric Co | Ultrasonic doppler blood stream meter |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58182172U (en) | 1983-12-05 |
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