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JPS5426089

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DESCRIPTION JPS5426089
Specification 1 and title of the invention Ultrasound scanning biopsy device 1) An ultrasonic
applicator consisting of at least an ultrasonic transducer element arranged in this row, and
individual or group control of the ultrasonic transducer elements A control device for controlling
the position of the transducer element simultaneously energized by the even and odd number of
transducer elements, where K is between two adjacent transducer elements when there is a
symmetry axis A symmetrical arrangement [C], which may be centered on the transducer
element, or otherwise centered on the transducer element, and the gap between the two
transducer elements by the axis of symmetry over the entire length of the applicator during the
scanning cycle Any position in the core of the transducer element, possibly in the first half of the
first transducer element group of the applicator In the one where the control takes place at least
once, with the exception of the converter elements of the latter and the converter elements of the
last half of the converter element group, in the control unit WL, the organized transmission /
reception tact , A group of even number transducer elements and a group of odd number
transducer elements are temporally organized and connected as follows, ie, each odd number of
even numbered connected tubes A group is connected so that it is first the receiver for the
reversal signal of the transmission pulse of the preceding group in the first tact to the group
connected in advance, and is switched to the transmitter in the subsequent tact An ultrasound
scanning biological examination apparatus characterized by
2, the scope of claims
3. Detailed description of the invention The present invention comprises an ultrasonic applicator
comprising at least one array of ultrasonic transducer elements, and a control device for
performing individual or group control of the ultrasonic transducer elements, The controller is
the axis of symmetry of the arrangement of transducer elements activated at tWI by the even and
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odd number of transducer elements, where K is two! A symmetrical arrangement between the
transducer elements, such as FJK (or at other times the center of the transducer elements),
between 1 lFv matching transducer elements, and-by the axis of symmetry over the entire length
of the applicator during the scanning cycle The gap between the two transducer elements, and in
any case at the center of the transducer element, can be obtained by combining the transducer
elements of the first half of the first group of transducer elements of the applicator and the last
transducer element group. With the exception of the transducer elements in the rear half, at least
-5 relates to an ultrasound-calibrated biopsy device in which the control takes place. An
apparatus of this type is already described in Japanese Patent Application Laid-Open No. 531981 #. @W: In the case of the device according to the publication, the control operation of the
transducer elements of the ultrasound array (for example according to FIG. 2) is a conversion of a
large number of transducer elements in a scan format which can be preset and a small number of
conversions. It is performed in groups of receiver elements, and each connected group is also a
transmitter with unaltered polarization and a receiver for the echo signal of its own ultrasound
pulses emitted from this group. Since the tact switches the transmit / receive cycle between the
large and the small number of transducer element groups, the tact of the transmit / receive cycle
changes the sound sfJ in the object to be examined and differs from one ultrasound scan to
another Offensive strength is scolded. Due to this effect, echo pulses of the boundary layer of the
gyrus can be displayed as a structure that emits different luminances on the screen of the
cathode ray quality which is radiated by the echo. It is an object of the present invention to
construct such VC so that the reflection structure of the eye 1 is displayed with the same
brightness on the screen of the lt screen in such a manner that the mounting is as technically
wasteful as possible. The purpose of this invention is to organize according to the invention the
group consisting of an even number of converter elements and the group consisting of an odd
number of converters EndPage: 2 rements in organized transmit / receive tact. To be connected
as follows, ie for each reflected even or odd group to the connected group, in the first tact, firstly
for the reflected signal of the transmission pulse of its preceding group , And connected to be
switched to the transmitter in the subsequent tact.
In the case of the device according to the invention, as in the case of the device C, it is cut
between any number of groups! ! 8えられる。 However, this switching is performed such that it
is transmitted by a group of a predetermined number of transducer elements, but is received by
another group of a next IC 1-f and a different number of converter elements. This other group is
then simultaneously the transmission group for the next cycle. Moreover, for the reception
associated with this further group of transmission pulses, it is switched to a group consisting of a
different number of transducer elements, for example to a group consisting of the same number
of transducer elements as the group initially introduced. Each active transducer acts as an
antenna, and the exchange law allows the transmit and receive antennas to be interchanged so
that equivalent transmit / receive characteristics are obtained for each transmit / receive cycle.
Therefore, approximately the same level of intensity occurs for echo pulses of all ultrasound
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lines. In other words, the reflection layer on the screen of the cathode cathode tube has the same
luminance as that of the homogeneous boundary layer. In an advantageous embodiment of the
device according to the invention, the control unit is adapted to arrange in time and alternately
connect groups of even converter elements and groups of odd converter elements, Each
connected even or odd group is to be the receiver V first and then the transmitter again for the
previously connected odd or even group. Hereinafter, embodiments of the present invention will
be described in detail with reference to the drawings. In FIG. 1, a conventional ultrasonic wave
end 1 rector 1 ', which can be improved by means of the device of JP-A 53-1981, consists of
individual transducer elements Wl' to Wn 'of the number n' = 108, for example They are
arranged in one single row 2 'and held on a support 3'. The support 3 'consists of a material that
absorbs ultrasound well, for example an epoxy crucible. Thus, in the 211 roll state, the emission
of ultrasound is performed only in the direction of the arrow 4 'perpendicular to the probe ms'
K5N of the applicator l'. The transducer elements 7 'W1' to Wn 'of this ultrasonic wave completer
1' are in particular piezoelectric crystal plates, and for these they have a thickness d-.alpha.5u,
width b = Q9fl, for example with respect to operating harmonics in the range of about 4 MH2. ,
Long and have t = S 朋. MFJsne = Q1u between individual elements. Therefore, the distance
between center points r = lrlM.
When the total number of converter elements is n '= 108, the total length fiL of the applicator l'
is 10 811ff. If the transducer elements are controlled, for example, in groups of four, and each
transducer is energized sequentially only one transducer element each time, then a line count of
about 105 lines of ultrasonic waves is obtained (transducers The lines for the first two elements
Wl ', W2' and the last two elements Wn-1 ', Wn'K of the column are suppressed. This is because
only the four complete groups should contribute to the line configuration. ). Also in the case of
the ultrasonic wave completer 1 according to FIG. 2 of the prior application, the transducer
elements W1 to in are arranged in rows 2 on the support 3 as -IL ′ ′ pressure! # 1 f II Fi is
used. The support 3 is constructed in the same manner as in FIG. 1 so that a vertical radiation
direction 4 is provided over the probe surface 5 of the applicator 1. The crystal plates Wl-Wn of
the transducer row 2 are the same as the crystal plates Wl 'to Wn' of the transducer row 2 'of the
applicator l' shown in FIG. It has 8 ms. However, unlike the crystal plates W1 to Wn ', the width
of the crystal plates W1 to Wn is twice as large, that is, 2b = 13 m. The gap is also enlarged
accordingly, ie, for example EndPage: 3 if 2s = Q2iu. Similarly, the distance between the center
points of the crystal plate is twice VC, that is, 2 r = 2 m. If the total length of the finish replicator l
is approximately L = 108, then the total number of required transducer elements is n-54.
However, despite the reduced number of elements, an applicator 1 vc according to FIG. 2 gives
approximately the same number of lines as in the case of the applicator according to FIG. That is,
as will be described in detail below with reference to FIG. 3, in the case of four or five groups of
shift rhythms ヲ, just 101 lines per 7 complete ultrasound images are obtained. In FIG. 3, the
ultrasonic applicator 1 is configured corresponding to that of FIG. The ultrasound applicator 1
thus consists of a transducer train 2 with a total of, in particular, 54 transducer elements.
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However, only the first seven transducer elements W1 to W7 and the n-th (i.e. 54th) transducer
element Wn are illustrated. In order to control the yellow converter elements W1 to Wn of the
converter row 2, the number of side-turning switches 81 to Sn according to the number of
converter elements of the switch panchromatic switch is useful.
In that case, the attached converter elements W1 to Wn are transmitted in transmission
operation in each of the switches 81 to Sn (in the 1-high frequency balun transmitter 7 and the
echo signal receiver SVC # in the 9-signal operation). A display device # 9, for example an
electron beam tube, is used to make the echo signal visible as an opposite or a cross-sectional
view, to which the luminance signal produced in the form of a line from the inspection object is
correspondingly line-shaped The screen Fvc is projected as a bright spot by modulation. In the
case of the device according to FIG. 3, according to the Japanese Patent Publication 53-1981, for
example, groups of four and five transducer elements alternately! The sequential activation of the
converter elements takes place. Therefore, each practical light according to FIG. 3 has one
associated group program generator 12 or 13 and has a total of two shift registers 10 and 11. In
that case, group program transmission @ 12 leads four sets of set pulses to shift register 10 at
the start of each scan, and then these set pulses to shift register 10 and the central clock control
oscillator 14 Each shift clock is set to be shifted by one register position each time. The shift
clock lead 15 serves to supply the clock control transmitter 14 shift clock pulses to the shift
register 10 IC. In a corresponding manner, the group program generator 13 generates in each
case five groups of unit pulses for the shift register 11 and the clock control introduced in the
shift register 11 via these unit pulse lamp shift clock m16. Each time it is shifted by one position
in the shift register 11 in synchronization with the shift clock pulse of the transmitter 14. The
group program generator 12 or 13 can be easily programmed, so that instead of the combination
of four groups and the combination of five groups, any other number of combinations of groups,
such as two groups and three groups etc. It can be selected. This is done via the logic gate 17 in
response to the output signal of the control light shift register 10 or 11 of each switch 81 to an
of the switch panchromatic. When the input pulse of the clock control transmitter 14 is led via
the logic gate 179-j, the switching input terminal 18 or the switching input terminal 19, the
output terminals A1 to An of each shift register 10 or 11 are switched to switches 81 to Connect
to SH control input terminal.
In this case, the output side of the shift register 10 is connected to the control input terminal of
the switches S1 to sn by the appearance of the closing pulse of the logic gate 17 and the open /
close input terminal 18iC. The appearance of the pulse is designed to connect the signal output
of the shift register 11 to the control input of switches Elf-8n. The respective input pulses for the
logic gate 17 are supplied from the clock control oscillator 14 as already mentioned.
Corresponding to this, the clock control transmitter 14 resets the reset signal as soon as the end
of the sequential shift operation of the pulse group by the respective shift registers to and 11iC is
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detected through the return command signal l522 or EndPage: 4Hn. A reset pulse for the shift
register IO or H is also generated via line insertion or 1j21. Control wick u against this. Through
5, the pulse transmitter 7 and the display 9 are supplied with the control signal of the clock
control oscillator 14 for transmission / reception cycles or echo formation. As already mentioned,
as shown in FIG. 3 and in the case of the principle circuit diagram according to JP-A-53-19'81,
the sequential introduction of the converter elements W1 to Wn alternately takes place in steps.
It takes place in one group and five groups. Therefore, at the start of each scan, a control pulse is
applied to group program generation @ 12 via clock control oscillator 4, so that group program
generator 12 causes shift register 10 to read the combination of four nest pulses. Established by
As soon as the reading process is completed, the clock control transmitter 14 applies an input
pulse to the input terminal 18 of the logic gate 17. This input pulse connects ff1llPA1-An of the
shift register 10 to the control input for the switches 81-Sn. Since only the first to fourth output
terminals A1 to M4 are set in the shift register 10, only the four switches 81 to 84 are closed
accordingly. The pulse transmitter 7 is energized to generate a high frequency pulse via the
control groove #U. This high-frequency pulse is transmitted to the transducers N1 to W4 via the
closed switches 81 to S4. These transducer elements W1 to W4 are energized in the lol phase,
and ultrasonic pulses are generated which scan the inspection object (not shown) with a scan line
corresponding to the arrow Z1. So far, the device according to FIG. 3 corresponds in five
operating modes to that of FIG. 3 of JP 53-1981.
However, according to a modification of the embodiment of FIG. 3, according to the invention, a
transmit / receive group switch is additionally provided, this switch γ being via the control
groove Ip 28 immediately after the first transmission pulse is emitted. The central clock control
transmitter 14 is activated via the logic gate 17 at the same time as the switches B1 to S4 are
reopened and the group program generator 13 is activated to read the group of five unit pulses
in the shift register llIC. As you switch. As soon as this reading process is completed, another
input pulse is applied to the λ power terminal 19 of the logic gate 17. This input pulse causes
the output terminals A1 to An of the 11 shift register 11 to control input terminals of the
switches 81 to Bn. It is close to ←. Since only the output terminals A1 to A5 of the output
terminals AI-An of all the shift registers 11a are set, the switches 81 to S5L7 '+ are closed this
time. The echo signals of the transmission pulses of the preceding group (4 transducer elements)
are here converted into corresponding electrical signals by the transducer elements W1 to W5
and are then applied to the echo signal receiver 8 via the switches 81 to S5. From there as a
corresponding echo signal to the display unit 9. Before switching to the next transducer group,
the pulse transmitter is activated to generate another high frequency pulse via the control
channel. With this high frequency pulse! 7 variants P5 nilemene) W1 to W5 are produced in the
simultaneous K1'1 fl phase. Now, ultrasonic pulses are generated which scan the inspection
object in the line direction z2. The direction of this arrow z2 then passes through the center of
the transducer element W3. At the end of this second transmission pulse, controlled via the
transmission / reception crews 4, the input pulse at the interval input 19 disappears again. Along
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with this, switches S1 to S85 are opened. At the same time, clock pulses are led from the clock
control oscillator 14 to the shift clock input terminal 15 of the shift register 10. The pulse
register group IOK is thereby shifted by one register position. At the end of this clocking process,
an input pulse is again applied to the logic gate 17 via the switching input terminal series.
Thereby, the output terminals A1 to An of the shift register 10 are connected again to the control
input terminals of the switches 81 to an. However, this time EndPage of the shift register 10: 5
forceps A2 to A5L or not because they are not set.
Correspondingly, only switches 82 to S5 are closed. The echo signals received from the line z2 by
the new transducer element groups W2 to W5 are given anew via the echo receiver 8 to the
display 1lt 9 for image display. After this reception cycle, the transducer elements W2-W5 are
energized via the activated pulse transmitter 7 and a line scan in the direction of the arrow z3
takes place. At the end of this third low-speed / transmission procedure, the group of five unit
pulses in shift register IHC is likewise shifted by one register position. The new conduction of the
logic gate 17 via the input terminal 19 closes the switches 82 to S6, so that the transducer
elements W2 to W6 are energized, so that a line scan in the direction of the arrow z4 is
performed. In the case of the shift register 11, the above-mentioned cycle, that is to say the
alternating shift operation of pulse groups in the shift register 10 or pulse groups in the shift
register 11 and the subsequent corresponding logic gate 17) The group is repeated until the end
of shift register 10 or 11 is reached, respectively. In this case, the scanning process ends with the
activation of the last 4 or 5 transducer elements of the transducer train 2 of the applicator 1, the
shift register 10 or 11 being reset, the shift register 10 or 11 The scanning process is performed
from the beginning again by newly reading the pulse and performing the cyclic shift operation.
As shown in FIG. 3, the result of this periodically advancing scan is a scan line field consisting of
scan lines having a spacing corresponding to half the distance between the center points of the
transducer elements W1 to Wn. . When the number of transducer elements is n-54, a line scan
pattern for each ultrasound signal consisting of a total of 2 (n-4) + 1 = 101 lines results. As a
result, half the number of transducer elements as compared to conventional ultrasonic
applicators provide approximately the same number of lines. The new scan format obtained in
this way guarantees a uniform brightness of the echo line in the screen of the cathode @ tube
due to the homogeneous construction, which is shown in FIG. In that case, the switching rhythms
between the even and odd groups of the letters n and n + 1 converter Nilemen) W1 to Wn are
shown. Right 1 in Fig. 4 The transmit / receive cycles of the input transducer element groups,
which are consecutive 5 hours in succession, are shown in parentheses with the symbols 8E1 to
sE6, which are arranged one after the other.
FIG. 4 is a line 21 to Zn of ultrasonic scan field for echo image line of uniform luminance on the
screen of the oscillograph tube shown in the lower side of FIG. Transmit / receive cycle by the
5th light, transmit pulse an and receive group by the n + 1 converter element for echo signal Kn
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of each transmit pulse an, or echo signal of transmit pulse Bfi + 1 and transmit pulse S negative
+1 -Shows the transmission / reception cycle with the reception group by n converter elements
for one thousand.
4. Brief description of the drawings Figs. 1 to 3 show the conventional flrl! Illustrated is an
ultrasonic applicator with an II [14 Je position, except that Figure 3 transmits / g! For switching
control of scanning operation. It is modified by the group switch according to the present
invention. Figure 4 変 I according to Figure 3! Fig. 5 illustrates the control operation performed
in a modified manner by the control device of interest, and Fig. 5 shows a transmission /
reception diagram in the case of the control operation according to Fig. 4. · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Echo signal display at 9 · · · echo image display @ island 10 °
11 · · · shift register, 12.13 · · Program generator, 14-· Clock control transmitter, 17 · · Logic /
F1118) Agent patent attorney Tomimura m :) = 1 = EndPage: 6 @ @ WI WI W2 W 34 W 56 n Fig,
4 Fig, 5 End Page: 7
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