JPH0556972A - Ultrasonic blood flow imaging device - Google Patents
Ultrasonic blood flow imaging deviceInfo
- Publication number
- JPH0556972A JPH0556972A JP3220047A JP22004791A JPH0556972A JP H0556972 A JPH0556972 A JP H0556972A JP 3220047 A JP3220047 A JP 3220047A JP 22004791 A JP22004791 A JP 22004791A JP H0556972 A JPH0556972 A JP H0556972A
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- blood flow
- cfm
- dsc
- imaging device
- circuit
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- Ultra Sonic Daignosis Equipment (AREA)
- Image Processing (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、医用超音波診断装置
等における超音波血流イメージング装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic blood flow imaging device in a medical ultrasonic diagnostic device or the like.
【０００２】[0002]
【従来の技術】従来の超音波血流イメージング装置は、
図３に示すように、送受波回路１と、直交検波回路２
と、Ａ／Ｄ変換器３、４と、ＭＴＩ（ムービ・ターゲッ
ト・インジケータ）回路５、６と、自己相関回路７と、
血流演算回路８と、ＤＳＣ（デジタル・スキャニング・
コンバータ）９と、Ｂモード検波回路１０と、Ａ／Ｄ変
換器１１とから構成されている。この超音波血流イメー
ジング装置では、自己相関回路７で求められたデータＲ
r （τ）、Ｒi （τ）、Ｒ(0) を血流演算回路８に送
り、その出力で得られた平均速度ω、パワーＰ、分散Ｖ
をＤＳＣ９に送り、ＤＳＣ９では、超音波ビームのスキ
ャン方向をＴＶの走査方向に変換する時に生じるモワレ
又、画像を滑らかにするための空間平均、フレーム相
関、フレーム補間等を行う。ＤＳＣ９は、Ｂモードのデ
ータと同様の処理を平均速度ω、パワーＰ、分散Ｖに対
し独立に行っている。2. Description of the Related Art A conventional ultrasonic blood flow imaging apparatus is
As shown in FIG. 3, a transmission / reception circuit 1 and a quadrature detection circuit 2
, A / D converters 3 and 4, MTI (movie target indicator) circuits 5 and 6, autocorrelation circuit 7,
Blood flow operation circuit 8 and DSC (digital scanning
A converter) 9, a B-mode detection circuit 10, and an A / D converter 11. In this ultrasonic blood flow imaging apparatus, the data R obtained by the autocorrelation circuit 7
The r (τ), R i (τ), and R (0) are sent to the blood flow calculation circuit 8, and the average velocity ω, power P, and variance V obtained by the output
To the DSC 9, and the DSC 9 performs moire generated when the scanning direction of the ultrasonic beam is converted to the scanning direction of the TV, spatial averaging for smoothing the image, frame correlation, frame interpolation and the like. The DSC 9 independently performs the same processing as the B mode data on the average speed ω, the power P, and the variance V.
【０００３】自己相関法による平均血流の演算は、特公
平１−５８４６９号に示すように、自己相関で得られた
Ｒr （τ）、Ｒi （τ）、Ｒ(0) を独立にフィルタリン
グして、アークタンジェントを取って平均流速を計算す
ることによってＳ／Ｎが大幅に改善できるというもので
あり、そのフィルタリング回数（加算平均回数）が多け
ればランダム雑音に対し、ノイズ成分の影響も小さくす
るという特徴をもっている。As shown in Japanese Patent Publication No. 1-58469, the calculation of the average blood flow by the autocorrelation method independently calculates R r (τ), R i (τ) and R (0) obtained by autocorrelation. It is said that the S / N can be significantly improved by filtering and taking the arc tangent to calculate the average flow velocity. If the number of times of filtering (additional average number) is large, the influence of the noise component on the random noise will also occur. It has the feature of being small.
【０００４】[0004]
【発明が解決しようとする課題】上記した従来装置にお
いて、血流演算回路で平均流速ωを直接計算して、ＤＳ
Ｃで補間、二次元平均フレーム補間を行う場合、例えば
２つの点を平均する場合は、（ω1 ＋ω2 ）／２という
方法をとるが、この場合反射エコーの振幅成分が含まれ
ておらず、２点の信号の強度に関わらず同じレベルの平
均になる。ＤＳＣに送られてくるパワーＰで（Ｐ1 ω1
＋Ｐ2 ω2 ）／（Ｐ1 ＋Ｐ2 ）の加重平均も考えられる
が、Ｐはノイズに対して相関を持った値であるため、Ｓ
／Ｎが悪いとノイズ信号のパワーで重み付けしているこ
とになる。すなわち、従来装置のＤＳＣ内での平均方法
及び補間方法では、振幅情報を持っていない平均流速ω
を用いて流速平均を行っており、平均によるＳ／Ｎが改
善されることはない。In the above-mentioned conventional apparatus, the average flow velocity ω is directly calculated by the blood flow calculation circuit to obtain the DS
When performing interpolation by C and two-dimensional average frame interpolation, for example, when averaging two points, the method of (ω 1 + ω 2 ) / 2 is used, but in this case, the amplitude component of the reflected echo is not included. The same level average is obtained regardless of the signal strengths of the two points. With the power P sent to the DSC (P 1 ω 1
A weighted average of + P 2 ω 2 ) / (P 1 + P 2 ) is also conceivable, but since P has a correlation with noise, S
If / N is bad, it means that the power of the noise signal is weighted. That is, in the averaging method and interpolation method in the DSC of the conventional device, the average flow velocity ω that does not have amplitude information.
Is used for averaging the flow velocity, and the S / N is not improved by the averaging.
【０００５】この発明は、上記問題点に着目してなされ
たものであって、Ｓ／Ｎが改善され、血流データが滑ら
かとなる超音波血流イメージング装置を提供することを
目的としている。The present invention has been made in view of the above problems, and an object thereof is to provide an ultrasonic blood flow imaging apparatus having improved S / N and smooth blood flow data.
【０００６】[0006]
【課題を解決するための手段及び作用】この発明の超音
波血流イメージング装置は、被検体に向けて送波した超
音波パルスの反射成分を位相検波してドップラ偏位情報
を求める位相検波部と、この位相検波出力に基づいて前
記被検体の血流情報のカラーフローマッピング処理を行
うＣＦＭ処理部と、このＣＦＭ処理部の出力に基づいて
ＣＦＭ像をＴＶ表示するものにおいて、ＣＦＭを求める
自己相関結果をフレームメモリに備えられるようにし
て、ＣＦＭに必要とする平均速度、分散あるいはパワー
は画像メモリ読み出し時に演算するようにしている。The ultrasonic blood flow imaging apparatus of the present invention is a phase detection unit for phase-detecting a reflected component of an ultrasonic pulse transmitted to an object to obtain Doppler deviation information. And a CFM processing unit for performing color flow mapping processing of blood flow information of the subject based on the phase detection output, and a CFM processing unit for displaying a CFM image on TV based on the output of the CFM processing unit. The correlation result is stored in the frame memory so that the average speed, dispersion or power required for the CFM is calculated when the image memory is read out.
【０００７】この超音波血流イメージ装置では、相関結
果のそれぞれに補間、スムージング等を先に行い、最後
に血流演算を行うので、見かけ上、自己相関のデータ点
数を多くしたのに等しく、Ｓ／Ｎが改善される。In this ultrasonic blood flow image device, interpolation, smoothing, etc. are performed first for each correlation result, and blood flow calculation is performed at the end, so apparently the number of autocorrelation data points is equal to S / N is improved.
【０００８】[0008]
【実施例】以下、実施例により、この発明をさらに詳細
に説明する。図１は、この発明の一実施例を示す超音波
血流イメージング装置のブロック図である。この超音波
血流イメージング装置は、送受波回路１と、直交検波回
路２と、Ａ／Ｄ変換器３、４と、ＭＴＩ回路５、６と、
自己相関回路７と、血流演算回路８と、ＤＳＣ９と、Ｂ
モード検波回路１０と、Ａ／Ｄ変換器１１とを備える点
で、図３に示す従来の超音波血流イメージング装置と変
わるところはない。この実施例装置の特徴は、自己相関
回路７の次に、ＤＳＣ９を配し、その後に血流演算回路
８を配置したことである。この実施例装置では、自己相
関回路７から出力される自己相関結果Ｒr （τ）、Ｒi
（τ）、Ｒ(0) をＤＳＣ９に書込み、ＤＳＣ９でこの３
種類値をそれぞれ独立にＤＳＣ補間、二次元平均、フレ
ーム補間等を行う。The present invention will be described in more detail with reference to the following examples. FIG. 1 is a block diagram of an ultrasonic blood flow imaging apparatus showing an embodiment of the present invention. This ultrasonic blood flow imaging apparatus includes a transmission / reception circuit 1, a quadrature detection circuit 2, A / D converters 3 and 4, MTI circuits 5 and 6, and
Autocorrelation circuit 7, blood flow calculation circuit 8, DSC 9, B
There is no difference from the conventional ultrasonic blood flow imaging apparatus shown in FIG. 3 in that the mode detection circuit 10 and the A / D converter 11 are provided. The feature of the device of this embodiment is that the DSC 9 is arranged next to the autocorrelation circuit 7, and the blood flow calculation circuit 8 is arranged after that. In this embodiment, the autocorrelation results R r (τ), R i output from the autocorrelation circuit 7
(Τ), R (0) is written in DSC9, and this 3
DSC interpolation, two-dimensional averaging, frame interpolation, etc. are performed for each type value independently.
【０００９】ＤＳＣ９内は、図２に示すように、４個の
ｒθフレームメモリ９１、９２、９３、９４を持ち、こ
のｒθフレームメモリは、距離方向をｒ、ビームの走査
角をθとし、ｒ方向、θ方向に空間的に平均を取ること
が可能である。又、前のフレームを持つことによって、
フレーム相関（平均）も行うことができる。ＴＶ画面の
走査方向にあった、ＸＹメモリ９５、９６、９７、９８
には、ｒθフレームメモリ９１、９２、９３、９４で平
均等を行った後、（ｒ、θ）を（ｘ、ｙ）に変換する際
に生じるデータのヌケ（モワレ）を補間する。これらの
演算処理は、従来のエコーデータ用のＤＳＣ９と同じよ
うに行われる。As shown in FIG. 2, the DSC 9 has four rθ frame memories 91, 92, 93 and 94. The rθ frame memory has a distance direction of r and a beam scanning angle of θ. It is possible to average spatially in the direction and the θ direction. Also, by having the previous frame,
Frame correlation (average) can also be performed. XY memories 95, 96, 97, 98 which were in the scanning direction of the TV screen
In order to perform the averaging and the like in the rθ frame memories 91, 92, 93, and 94, the missing data (moiré) generated when converting (r, θ) into (x, y) is interpolated. These arithmetic processes are performed in the same manner as the conventional DSC 9 for echo data.
【００１０】そして、ＤＳＣ９よりのＲr ’（τ）、Ｒ
i ’（τ）、Ｒ’(0) を受けて、血流演算回路８では、Then, R r '(τ), R from the DSC 9
In response to i '(τ) and R' (0), the blood flow calculation circuit 8
【００１１】[0011]
【数１】 [Equation 1]
【００１２】の演算が行われる。以上のように、この血
流イメージ装置では、自己相関によって得られたＲ
r （τ）、Ｒi （τ）、Ｒ(0) をＤＳＣに書込み、この
ままの数値で演算することにより、Ｓ／Ｎのよい血流断
層像が得られる。The calculation of is performed. As described above, in this blood flow image device, R obtained by autocorrelation is obtained.
By writing r (τ), R i (τ), and R (0) in the DSC and calculating the values as they are, a blood flow tomographic image with good S / N can be obtained.
【００１３】[0013]
【発明の効果】この発明によれば、相関結果を先ずフレ
ームメモリに記憶して、補間等を行い、その後血流演算
を行うので、見かけ上、自己相関のデータ点数を多くし
たのと同じとなり、Ｓ／Ｎが改善される。また、血流デ
ータが滑らかになる。According to the present invention, the correlation result is first stored in the frame memory, the interpolation and the like are performed, and then the blood flow is calculated. Therefore, it is apparently the same as when the number of autocorrelation data points is increased. , S / N is improved. In addition, the blood flow data becomes smooth.
【図１】この発明の一実施例超音波血流イメージング装
置を示すブロック図である。FIG. 1 is a block diagram showing an ultrasonic blood flow imaging apparatus according to an embodiment of the present invention.
【図２】同超音波血流イメージング装置のＤＳＣの具体
的構成を示すブロック図である。FIG. 2 is a block diagram showing a specific configuration of a DSC of the ultrasonic blood flow imaging apparatus.
【図３】従来の超音波血流イメージング装置を示すブロ
ック図である。FIG. 3 is a block diagram showing a conventional ultrasonic blood flow imaging apparatus.
１ 送受波回路 ２ 直交検波回路 ７ 自己相関回路 ８ 血流演算回路 ９ ＤＳＣ 1 Transmitting / Receiving Circuit 2 Quadrature Detection Circuit 7 Autocorrelation Circuit 8 Blood Flow Calculation Circuit 9 DSC
Claims (1)
射成分を位相検波してドップラ偏位情報を求める位相検
波部と、この位相検波出力に基づいて前記被検体の血流
情報のカラーフローマッピング処理を行うＣＦＭ処理部
と、このＣＦＭ処理部の出力に基づいてＣＦＭ像をＴＶ
表示する二次元血流断層装置において、 ＣＦＭを求める自己相関結果をフレームメモリに蓄えら
れるようにして、ＣＦＭに必要とする平均速度、分散あ
るいはパワーは画像メモリ読み出し時に演算することを
特徴とする超音波血流イメージング装置。1. A phase detection unit for phase-detecting a reflected component of an ultrasonic pulse transmitted to a subject to obtain Doppler deviation information, and a blood flow information of the subject based on the phase detection output. A CFM processing unit that performs color flow mapping processing, and a CFM image is displayed on the TV based on the output of the CFM processing unit.
In the two-dimensional blood flow tomography device to display, the autocorrelation result for obtaining the CFM is stored in the frame memory, and the average velocity, dispersion, or power required for the CFM is calculated when the image memory is read out. Ultrasound blood flow imaging device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22004791A JP3269096B2 (en) | 1991-08-30 | 1991-08-30 | Ultrasound blood flow imaging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22004791A JP3269096B2 (en) | 1991-08-30 | 1991-08-30 | Ultrasound blood flow imaging device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0556972A true JPH0556972A (en) | 1993-03-09 |
| JP3269096B2 JP3269096B2 (en) | 2002-03-25 |
Family
ID=16745097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22004791A Expired - Fee Related JP3269096B2 (en) | 1991-08-30 | 1991-08-30 | Ultrasound blood flow imaging device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3269096B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008000583A (en) * | 2006-05-24 | 2008-01-10 | Iyo Choonpa Gijutsu Kenkyusho:Kk | Image interpolation method, image interpolation device, and ultrasonic diagnostic system |
| JP2008178472A (en) * | 2007-01-23 | 2008-08-07 | Toshiba Corp | Ultrasonic diagnostic device |
-
1991
- 1991-08-30 JP JP22004791A patent/JP3269096B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008000583A (en) * | 2006-05-24 | 2008-01-10 | Iyo Choonpa Gijutsu Kenkyusho:Kk | Image interpolation method, image interpolation device, and ultrasonic diagnostic system |
| JP2008178472A (en) * | 2007-01-23 | 2008-08-07 | Toshiba Corp | Ultrasonic diagnostic device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3269096B2 (en) | 2002-03-25 |
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