JPS5818095B2 - Ultrasonic diagnostic probe - Google Patents

Ultrasonic diagnostic probe

Info

Publication number
JPS5818095B2
JPS5818095B2 JP52085892A JP8589277A JPS5818095B2 JP S5818095 B2 JPS5818095 B2 JP S5818095B2 JP 52085892 A JP52085892 A JP 52085892A JP 8589277 A JP8589277 A JP 8589277A JP S5818095 B2 JPS5818095 B2 JP S5818095B2
Authority
JP
Japan
Prior art keywords
acoustic
acoustic impedance
reflector
vibrator
echo
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
Application number
JP52085892A
Other languages
Japanese (ja)
Other versions
JPS5421082A (en
Inventor
義博 吉川
達夫 長崎
克巳 藤永
好明 小林
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.)
Hitachi Ltd
Original Assignee
Aloka Co 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 Aloka Co Ltd filed Critical Aloka Co Ltd
Priority to JP52085892A priority Critical patent/JPS5818095B2/en
Publication of JPS5421082A publication Critical patent/JPS5421082A/en
Publication of JPS5818095B2 publication Critical patent/JPS5818095B2/en
Expired legal-status Critical Current

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  • Ultra Sonic Daignosis Equipment (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Description

【発明の詳細な説明】 本発明は振動子の音響インピーダンスと被検体表面にお
ける音響インピーダンスとの整合を考慮した超音波診断
用探触子に関する。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic diagnostic probe that takes into consideration the matching between the acoustic impedance of a transducer and the acoustic impedance on the surface of a subject.

従来の探触子は第1図aに示す如く、その振動子1は、
前面をエポキシ樹脂系のコーテング材2によってコーテ
ングされ、後面は音響ダンパー材によって保持されてい
る。
As shown in FIG. 1a, a conventional probe has a transducer 1 as shown in FIG.
The front surface is coated with an epoxy resin coating material 2, and the rear surface is held by an acoustic damper material.

かXる探触子を被検体3上に置いて超音波の送受波を行
なった場合、振動子1で発射された超音波パルスは被検
体3の内部の反射体4で反射され、探触子1で反射体エ
コーとして受波される。
When an ultrasonic probe is placed on the object 3 to transmit and receive ultrasonic waves, the ultrasonic pulse emitted by the transducer 1 is reflected by the reflector 4 inside the object 3, and the probe The wave is received as a reflector echo by the sensor 1.

このとき、被検体表面における被検体の音響インピーダ
ンスとコーテング材2の音響インピーダンスが異なると
、反射体エコーの一部は、が5る境界面から被検体内に
反射されて再び反射体4に投射され、ここで再び反射さ
れて探触子1で受波される。
At this time, if the acoustic impedance of the subject on the surface of the subject differs from the acoustic impedance of the coating material 2, a part of the reflector echo will be reflected into the subject from the boundary surface and projected onto the reflector 4 again. Here, the wave is reflected again and received by the probe 1.

このように同一反射体4から複数回反射されてのち受波
されるエコーは多重エコーと云われ、反射体までの距離
を複数倍で表示することとなり、これが大きいときは目
的とする反射体エコーと区別がつかなくなり誤診をまね
くこととなる。
Echoes that are received after being reflected multiple times from the same reflector 4 are called multiple echoes, and the distance to the reflector is displayed multiple times, and if this is large, the target reflector echo is It becomes difficult to distinguish between the two, leading to misdiagnosis.

上記エコーの時間関係を示すと第1図すの如くなる。The time relationship of the above echoes is shown in Figure 1.

図においてB。は送信パルス、B1は反射体エコー、B
2は多重エコーの一つを示す。
B in the figure. is the transmitted pulse, B1 is the reflector echo, B
2 indicates one of the multiple echoes.

次にB1とB2との関係を定量的に検討する。Next, the relationship between B1 and B2 will be quantitatively examined.

一般に、音響インピーダンスが異なる2媒質の境界面に
おける音波の反射と透過については次の関係式が示され
る。
Generally, the following relational expression is shown for the reflection and transmission of sound waves at the interface between two media with different acoustic impedances.

すなわち、音響勢力P1を音響インピーダンスZ1の媒
質からZ2の媒質へ伝送するとき、透過する勢力をB2
、その透過率をT1□とし、両媒質の境界面から媒質1
へ反射される勢力をP、反射率をR21とすれば、 Pr Z−Z 2 Ft21−−= (==) ・・・・・・・・
・ (1)P、 Z1+Z2 B2 4Z、Z2 1・・−四一”−” (Z1+Z2)・−°−<2)
)となる。
That is, when transmitting acoustic force P1 from a medium with acoustic impedance Z1 to a medium with acoustic impedance Z2, the transmitted force is B2.
, its transmittance is T1□, and medium 1 is
If the force reflected to is P and the reflectance is R21, then Pr Z-Z 2 Ft21--= (==) ・・・・・・・・・
・ (1) P, Z1+Z2 B2 4Z, Z2 1...-41"-"(Z1+Z2)・-°-<2)
).

第1図において、探触子1から投射されたパルスについ
て、被検体3の内部の反射体4から反射されたエコーB
、と多重エコーB2を求めると(上記の如き記法を用い
て)、 BにT1□・T23・R43・Ta2・T”21
・・・・−・・・・・・・(3)B2=T1□・T2
3・R43・R23・R43・T3□・T2.・・・・
・・(4)と表わされる。
In FIG. 1, an echo B is reflected from a reflector 4 inside a subject 3 for a pulse projected from a probe 1.
, and find the multiple echo B2 (using the above notation), B has T1□・T23・R43・Ta2・T”21
・・・-・・・・・・・・・(3) B2=T1□・T2
3・R43・R23・R43・T3□・T2.・・・・・・
...It is expressed as (4).

従って反射体エコーに対する多重エコーの比をrとすれ
ば ・=拘−R23・R43= (””み)・(R為・・・
(5)B、Z2+Z3Z4+Z3 となる。
Therefore, if the ratio of multiple echoes to reflector echoes is r, then...
(5) B, Z2 + Z3 Z4 + Z3.

ここで、 振動子1の音響インピーダンス Z 1 = 32 X 105.&/cr?t −5e
cエポキシコーテング材2の音響インピーダンスZ2
二5. I X 105g/’1−sec被検体3(表
面にて)の音響インピーダンスZ3= 1.6 X 1
05&/crit −5ec反射体4の音響インピーダ
ンスZ4については、z4>z3 とすれば、 B、=0.12 、 B2=0.032 、 r=’二
0.27−(6)よ、+□、if、6oB’ このように、目的とする反射体エコーに対し希望しない
多重エコーが相当大きな値を示すため、診断上、甚だし
い不都合を生ずる。
Here, acoustic impedance Z 1 of vibrator 1 = 32 x 105. &/cr? t-5e
c Acoustic impedance Z2 of epoxy coating material 2
25. I X 105g/'1-sec Acoustic impedance Z3 of object 3 (at surface) = 1.6 X 1
05&/crit -5ec Regarding the acoustic impedance Z4 of the reflector 4, if z4>z3, B, = 0.12, B2 = 0.032, r = '20.27 - (6), +□ , if, 6oB' In this way, the undesired multiple echoes exhibit a considerably large value relative to the desired reflector echoes, resulting in serious inconvenience in diagnosis.

本発明の目的は、杏尿の不都合を排除することにあり、
振動子の前面に、音響インピーダンスが連続に変化する
音響媒介物を付加することにより、超音波受波の際に、
被検体内の強い反射体による多重反射を減少させるよう
′にした。
The purpose of the present invention is to eliminate the inconvenience of apricot urine,
By adding an acoustic medium whose acoustic impedance changes continuously to the front of the transducer, when receiving ultrasonic waves,
It was designed to reduce multiple reflections caused by strong reflectors inside the subject.

以下、これを図面により詳細に説明する。This will be explained in detail below with reference to the drawings.

本発明においては、その実施例として第1図におけるコ
ーチイブ材2の代りに、音響インピーダンスが振動子に
おけると同程度の大きざから被検体表面における被検体
音響インピーダンスと同程度の太きさまで連続に変イ1
ヒする音響媒介物2′を用いる。
In the present invention, as an embodiment of the present invention, instead of the coachib material 2 in FIG. Weird 1
An acoustic medium 2' is used.

前記音響媒介物2′としては、例えば、タングステン粉
末をエポキシ樹脂系接着材中に混合し、自然硬化させて
形成することができる。
The acoustic medium 2' can be formed, for example, by mixing tungsten powder into an epoxy resin adhesive and allowing it to harden naturally.

これは、前記硬化中、該混合物におけるタングステンが
、これより比重の甚だ小さな前記接着材中を降下する現
象の応用であるが、さらに、前記接着材の粘度、硬化時
間、タングステン粉末の粒度等を選ぶ必要がある。
This is an application of the phenomenon that during the curing, the tungsten in the mixture descends into the adhesive, which has a much smaller specific gravity, but it also takes into account the viscosity of the adhesive, the curing time, the particle size of the tungsten powder, etc. You need to choose.

即ち、か5る選択により混合硬化形成物の組成として、
上部は殆んどタングステンを含まず、下部は振動子にお
けると同程度の音響インピーダンスを示す如きタングス
テン含有量となる如く、タングステンの降下を制御すべ
きことは云うまでもない。
That is, the composition of the mixed cured product is determined by the following selections:
It goes without saying that the fall of tungsten should be controlled so that the upper part contains almost no tungsten and the lower part has a tungsten content that exhibits the same level of acoustic impedance as in the vibrator.

このような音響媒介物2′を使用する場合の反射体エコ
ーB;および多重エコーB2は(3) 、 (4) 、
(5)と同様に求められ 1 B1=T1□・T23・R43・Ta2・T2□
・・・(7)鶴−T1□′・T2.′・R43・
R23′・R43・T32′・T2、′・・・(8)r
−/ −R23’ R43=(全戸’) (=) ・
(9)2 B1Z2+Z3Z4+Z3 となる。
Reflector echo B when using such an acoustic medium 2'; and multiple echo B2 are (3), (4),
Obtained in the same way as (5) 1 B1=T1□・T23・R43・Ta2・T2□
...(7) Tsuru-T1□'・T2. '・R43・
R23'・R43・T32'・T2,'...(8)r
-/ -R23' R43=(all units') (=) ・
(9)2 B1Z2+Z3Z4+Z3.

1 また、この場合、音響インピーダンスZ2′を、振
動子の音響インピーダンスZ1と同程度の値から、エポ
キシ樹脂系接着材の音響インピーダンスの値まで、連続
的に変化させ Z2’== 32〜2.2 X 10” 9/(i・5
ec−となるように音響媒介物2′を形成すれば、他の
音響インピーダンスZ1.Z3.Z4が前掲と同様のと
き、前述の数値例(6)に対応して、 BI3−0.95Bニー0.024r′訓=0.025
・・・00)1 、が得られる。
1 In this case, the acoustic impedance Z2' is continuously changed from a value comparable to the acoustic impedance Z1 of the vibrator to the value of the acoustic impedance of the epoxy resin adhesive Z2'==32 to 2. 2 X 10” 9/(i・5
If the acoustic medium 2' is formed so that ec-, the other acoustic impedance Z1. Z3. When Z4 is the same as above, corresponding to the numerical example (6) above, BI3-0.95B knee 0.024 r' kn = 0.025
...00)1 is obtained.

それ故(6)と(1,0)とから、次の改善効果が示さ
れる。
Therefore, from (6) and (1,0), the following improvement effect is shown.

B’ 0.95.r O,271 −二□云8 B、 0.12 r O,02511□
以上説明したように、本発明の探触子を使用すれば、
目的とする反射体エコーを太きくシ、希望しない多重エ
コーを小さくできるので、従来の如き多重エコーによる
誤診を防止できる。
B' 0.95. r O,271 -2□云8 B, 0.12 r O,02511□
As explained above, if the probe of the present invention is used,
Since the target reflector echo can be made thicker and the undesired multiple echoes can be made smaller, it is possible to prevent misdiagnosis due to multiple echoes as in the past.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図aは探触子を被検体に接触せしめた状況を示す従
断面図、第1図すは送信パルスとエコーパルスの時間的
関係図、第2図は音響インピーダンスの異なる境界での
反射・透過の説明に供する図面、第3図は反射体エコー
ならびに多重エコー1の定量的説明に供する図面。 1・・・・・・振動子、2・−・・・・コーテング材、
2′・・・・・・音響媒介物。
Figure 1a is a cross-sectional view showing the situation when the probe is brought into contact with the subject, Figure 1 is a temporal relationship diagram of transmitted pulses and echo pulses, and Figure 2 is a reflection at boundaries with different acoustic impedances.・A drawing for explaining transmission, and FIG. 3 is a drawing for quantitatively explaining reflector echo and multiple echo 1. 1... Vibrator, 2... Coating material,
2'...Acoustic medium.

Claims (1)

【特許請求の範囲】[Claims] 1 振動子と、該振動子の一面に設けられ被検体表面に
接触する音響媒介物と゛、を有し、前記音響媒介物の音
響インピーダンスは、′振動子に接する位置では振動子
の音響インピーダンスとほぼ等しく被検体表面に接する
位置では被検体表面の音響インピーダンスとほぼ等しく
設定され、音響媒介物の音響インピーダンスは、振動子
に接する位置と被検体表面に接する位置との間で連続的
に変化していることを特徴とする超音波診断用探触子。
1 comprises a vibrator and an acoustic medium provided on one surface of the vibrator and in contact with the surface of the subject; the acoustic impedance of the acoustic medium is equal to the acoustic impedance of the vibrator at a position in contact with the vibrator. The acoustic impedance of the acoustic medium is set to be approximately equal to the acoustic impedance of the surface of the test object at positions where it is in contact with the surface of the test object, and the acoustic impedance of the acoustic medium changes continuously between the position where it is in contact with the transducer and the position where it is in contact with the surface of the test object. An ultrasonic diagnostic probe characterized by:
JP52085892A 1977-07-18 1977-07-18 Ultrasonic diagnostic probe Expired JPS5818095B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP52085892A JPS5818095B2 (en) 1977-07-18 1977-07-18 Ultrasonic diagnostic probe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP52085892A JPS5818095B2 (en) 1977-07-18 1977-07-18 Ultrasonic diagnostic probe

Publications (2)

Publication Number Publication Date
JPS5421082A JPS5421082A (en) 1979-02-16
JPS5818095B2 true JPS5818095B2 (en) 1983-04-11

Family

ID=13871530

Family Applications (1)

Application Number Title Priority Date Filing Date
JP52085892A Expired JPS5818095B2 (en) 1977-07-18 1977-07-18 Ultrasonic diagnostic probe

Country Status (1)

Country Link
JP (1) JPS5818095B2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59166139A (en) * 1983-03-10 1984-09-19 富士通株式会社 Ultrasonic transducer
JPS60261440A (en) * 1984-06-07 1985-12-24 富士通株式会社 Ultrasonic transducer and its production
JPH0347611Y2 (en) * 1988-02-26 1991-10-11
JP2002328120A (en) * 2001-04-27 2002-11-15 Hitachi Ltd Ultrasonic probe, and method for ultrasonic flaw detection

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5533020A (en) * 1978-08-28 1980-03-08 Mitsubishi Electric Corp Manufacture of semiconductor device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5533020A (en) * 1978-08-28 1980-03-08 Mitsubishi Electric Corp Manufacture of semiconductor device

Also Published As

Publication number Publication date
JPS5421082A (en) 1979-02-16

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