JPS5988142A - Ultrasonic application apparatus - Google Patents
Ultrasonic application apparatusInfo
- Publication number
- JPS5988142A JPS5988142A JP19950082A JP19950082A JPS5988142A JP S5988142 A JPS5988142 A JP S5988142A JP 19950082 A JP19950082 A JP 19950082A JP 19950082 A JP19950082 A JP 19950082A JP S5988142 A JPS5988142 A JP S5988142A
- Authority
- JP
- Japan
- Prior art keywords
- medium layer
- piezoelectric element
- ultrasonic application
- application apparatus
- echoes
- 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.)
- Pending
Links
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
本発明は、少くともパルサーとトランスジューサの圧電
素子とからなり、主に超音波の波動としての性質を用い
て、とくに生体内構造など被検媒質から伺らかの情報を
得るための超音波応用装置に関する。[Detailed Description of the Invention] The present invention consists of at least a pulser and a piezoelectric element of a transducer, and mainly uses the wave properties of ultrasonic waves to collect information from a test medium, such as an in-vivo structure. This invention relates to an ultrasonic application device for obtaining.
具体例として、超音波診断装置について云えば、サイド
ロープによるエコー、多重反射エコー等により生ずるア
ーチファクト（偽像ないし、ぼけ）は、今なお、超音波
走査画像の最大欠点である。As a specific example, in terms of ultrasound diagnostic equipment, artifacts (false images or blurring) caused by echoes due to side lobes, multiple reflection echoes, etc. are still the biggest drawback of ultrasound scanned images.
本発明は、これにかんがみて、そのようなアーチファク
トが軽減された超音波応用装置の提供を、その目的とす
る。In view of this, it is an object of the present invention to provide an ultrasound application device in which such artifacts are reduced.
この目的は、圧電素子と被検媒質層に中間媒質層を介在
させ、この中間媒質層は被検媒質より音速が犬であるも
のから選ばれることにより達成される。This object is achieved by interposing an intermediate medium layer between the piezoelectric element and the medium layer to be measured, and this intermediate medium layer is selected from a material whose sound speed is faster than that of the medium to be measured.
図面につｂて、本発明の好適な実施例を説明する０
第２図は従来例を示す説明図であり、被検媒質■の各点
Ａ、Ｂ、Ｃで反射され、矢印の方向に向うエコーは、す
べてトランスジューサ圧電素子■にとして入力されるた
め、アーチファクトを生じることになる。A preferred embodiment of the present invention will be explained with reference to the drawings.0 Figure 2 is an explanatory diagram showing a conventional example. All the echoes going forward will be input to the transducer piezoelectric element 2, resulting in artifacts.
第１図は、本発明の一実施例を示す概略構成図であるが
、パルサーは図示を省略している。■がトランスジュー
サの圧電素子、■が中間媒質層、■が被検媒質 である
。図示のように、圧電素子■と被検媒質■の中間に、音
速Ｃ１で、被検媒質■の音速Ｃ２に対し、Ｃ１＞ Ｃ２
の中間媒質層■が介在される。この場合、各々の媒質の
音響インビーダンスは、出来れば２１÷２２であること
が望ましい。FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention, but the pulsar is not shown. ■ is the piezoelectric element of the transducer, ■ is the intermediate medium layer, and ■ is the test medium. As shown in the figure, between the piezoelectric element ■ and the test medium ■, at the sound speed C1, with respect to the sound speed C2 of the test medium ■, C1>C2.
Intermediate medium layer (2) is interposed. In this case, the acoustic impedance of each medium is preferably 21÷22.
これは、両媒質の音響インピーダンスが等しいと境界面
で反射せず、後述するように、全部屈折するからである
。なお、音響インピーダンスＺは、被検媒質の密度ｅと
音速Ｃとの積により求められる。また、中間媒質層■の
厚さｄは、一般には近距離音場内に選択される。This is because if the acoustic impedances of both media are equal, the light will not be reflected at the interface and will be completely refracted, as will be described later. Note that the acoustic impedance Z is determined by the product of the density e of the test medium and the speed of sound C. Furthermore, the thickness d of the intermediate medium layer (2) is generally selected to be within the near-field sound field.
音速が異なる２つの媒質境界面に超音波ビームが斜めに
入射すると、ビームは直進せず、図示のように、屈折す
る。詳しくは、媒質■から媒質■へ向ったエコーは、
では、図示のように、例えば、Ｂ点からのエコーは入射
角θ２よりも大きく屈折されるため、圧電素素子■には
到達しなくなるため、Ａ点のみのエコーが検出され、Ｂ
点及び０点からのエコーは検出されず、結果として、ア
ーチファクトが軽減されることになる。なお、この場合
、中間媒質層■の厚さｄが小さすぎると、屈折エコーが
圧電素子に入射されてしまうので、適当に調整される。When an ultrasonic beam obliquely enters an interface between two media having different sound velocities, the beam does not travel straight, but is refracted as shown in the figure. Specifically, the echo from the medium ■ to the medium ■ is as shown in the figure.For example, the echo from point B is refracted by a angle greater than the incident angle θ2, so it does not reach the piezoelectric element ■. , the echo of only point A is detected, and the echo of point B
Echoes from points and zero points will not be detected, resulting in reduced artifacts. In this case, if the thickness d of the intermediate medium layer (2) is too small, refraction echoes will be incident on the piezoelectric element, so it should be adjusted appropriately.
本発明によれば、音響インピーダンスＺ１、Ｚ２は必ら
ずしも等しい必要がない。このことは前述した通りであ
る。他の実施例は、音響レンズと組合わせることにより
構成される。なお、トランスジューサは単一素子に限ら
ず、アレイ状の場合でも同様に適用される。According to the invention, the acoustic impedances Z1, Z2 do not necessarily have to be equal. This is as described above. Other embodiments are constructed in combination with acoustic lenses. Note that the transducer is not limited to a single element, and may be applied in the same manner to an array.
本発明によれば、受波時には、前述の説明のように、フ
ィルターのように直線以外の経路からまわり込むエコー
を排除して、アーチファクトの軽減となる。According to the present invention, when receiving waves, as described above, echoes that come around from a path other than a straight line are eliminated like a filter, thereby reducing artifacts.
第１図は、本発明の構成例を示す概略図、第２図は、従
来例の同Ｓ図である。
特許出願人 恢式会社 高滓製作所
ｍ１図
Ｃ４＞Ｃ１
−ｚ２
第２図FIG. 1 is a schematic diagram showing a configuration example of the present invention, and FIG. 2 is an S diagram of the conventional example. Patent applicant: Koshiki company: Takasago Seisakusho m1 Diagram C4>C1 -z2 Diagram 2
Claims (1)
なり、圧電素子と被検媒質層に中間媒質層を介在させ、
この中間媒質層は、被検媒質層より音速が大であること
を特徴とする、超音波応用装置。It consists of at least a piezoelectric element of a pulser and a transducer, and an intermediate medium layer is interposed between the piezoelectric element and the medium layer to be measured,
An ultrasonic application device characterized in that the intermediate medium layer has a higher sound velocity than the test medium layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19950082A JPS5988142A (en) | 1982-11-12 | 1982-11-12 | Ultrasonic application apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19950082A JPS5988142A (en) | 1982-11-12 | 1982-11-12 | Ultrasonic application apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5988142A true JPS5988142A (en) | 1984-05-22 |
Family
ID=16408854
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19950082A Pending JPS5988142A (en) | 1982-11-12 | 1982-11-12 | Ultrasonic application apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5988142A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60188842A (en) * | 1984-03-09 | 1985-09-26 | Terumo Corp | Ultrasonic probe |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56100049A (en) * | 1980-01-11 | 1981-08-11 | Yokogawa Electric Works Ltd | Ultrasonic diagnostic apparatus |
-
1982
- 1982-11-12 JP JP19950082A patent/JPS5988142A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56100049A (en) * | 1980-01-11 | 1981-08-11 | Yokogawa Electric Works Ltd | Ultrasonic diagnostic apparatus |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60188842A (en) * | 1984-03-09 | 1985-09-26 | Terumo Corp | Ultrasonic probe |
| JPH0254093B2 (en) * | 1984-03-09 | 1990-11-20 | Terumo Corp |
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