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JPH03126443

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DESCRIPTION JPH03126443
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
anila-array type ultrasonic probe used for transmitting and receiving ultrasonic waves in an
ultrasonic diagnostic apparatus that transmits and receives ultrasonic waves to obtain a
tomographic image. 2. Related Art Conventionally, an ultrasonic probe in which one disk-shaped
ultrasonic transducer and one or more ring-shaped ultrasonic transducers are arranged
concentrically is generally referred to as an animation array ultrasonic transducer. It is known as
a high quality mechanical sector ultrasonic probe which can change focal length by switching
ultrasonic transducers to be used and delay synthesis of the signals of each ultrasonic
transducer. (E.g., JP-A-49-4388). In the following description of the conventional example with
reference to FIG. 8, reference numeral 11 in FIG. 8 denotes an ultrasonic transducer, a diskshaped ultrasonic transducer 12-1, and the disk-shaped ultrasonic transducer 12-. It is comprised
from the ring-shaped ultrasonic transducer | vibrator 12-2.12.3 and 12-n arrange | positioned
concentrically one by one with respect to IK. 13-1. 13-2 to 13-n are delay circuits, and the diskshaped ultrasonic transducer 12-1 and the ring-shaped ultrasonic transducer 12-2. 12-3 to 12-n
The echo signal received at step (d) is delayed by a delay time corresponding to each ultrasonic
transducer to form a focal point at a predetermined depth. An adder 14 synthesizes echo signals
delayed by a predetermined time by the delay circuits 13-1. 13-2 to 13-n. Hereinafter, the
operation of the above configuration will be described. The echo signal from the point to be
measured has a propagation distance of time during which the n ultrasonic transducers of the
disk-shaped ultrasonic transducer 12-1 and the ring-shaped ultrasonic transducers 12-2 to 12-n
receive. Different from the difference, by correcting the time difference by the delay circuits 13-1
to 13-n, the phase can be correctly synthesized when adding the received signal in the adder 14,
and only the echo signal from the measurement point is It can be selectively received. In other
words, the measurement point can be set arbitrarily by changing the delay time of the delay
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circuits 13-1 to 13-n. SUMMARY OF THE INVENTION However, the above-mentioned
conventional annihila-array type ultrasonic probe as described above is a disk for correctly
synthesizing the phase when performing phase synthesis using the delay circuits 13-1 to 13-n. It
is necessary to reduce the size of the ultrasonic transducer 12-1 and to use a large number of
narrow ring-shaped ultrasonic transducers 12-2 to 12-n. Requires at least one disk-shaped
ultrasonic transducer 12-1 and four to five ring-shaped ultrasonic transducers 12-2.12-3.
For this reason, not only the processing of each ultrasonic transducer and the routing of the
electrodes are very difficult, but many expensive delay circuits must be used. In addition, the
ring-shaped ultrasonic transducers 12-2.12-3,... Can not be narrowed so much due to processing
restrictions etc., and the disk-shaped ultrasonic transducers 12-1 and the ring-shaped ultrasonic
transducers The shape of the ultrasonic transmitting and receiving element 11 configured by 122.12-3,... Furthermore, when the shape of the ultrasonic transmitting / receiving element 11
becomes large as described above, the mechanical scanning method can not be a rotation method
in which a plurality of elements are arranged, and it becomes a reciprocating motion method.
There are problems such as the inability to increase the frame rate of The present invention
solves the problems of the prior art as described above, can reduce cost without requiring a delay
circuit, and can reduce the number of ring-shaped ultrasonic transducers. There is provided an
ultrasonic probe which can be reduced in size, and hence can be processed, routed, and easily
handled, and, in addition to the above-mentioned purpose, it is also possible to To provide an
ultrasonic probe which makes it possible to obtain a thin, high-resolution diagnostic image at one
time over a wide range, and to increase the frame rate in addition to each of the above objects. It
is an object of the present invention to provide an ultrasonic probe which is capable of obtaining
a high quality image. Means for Solving the Problems The technical solution of the present
invention for achieving the above object comprises a disc-shaped ultrasonic transducer, and a
plurality of ultrasonic waves concentrically to the disc-shaped ultrasonic transducer. At least one
ring-shaped ultrasonic transducer whose plane is in the same plane, and a geometric focus for
focusing the ultrasonic waves on one point, which are disposed on the ultrasonic emitting
surfaces of both ultrasonic transducers. It has the acoustic lens which it has. In addition, a diskshaped ultrasonic transducer, and at least one ring-shaped ultrasonic transducer concentric to
the disk-shaped ultrasonic transducer and having an ultrasonic radiation surface in the same
plane, and both of these Acoustic lens disposed on the ultrasonic radiation surface of the
ultrasonic transducer and having a geometric focus for focusing the ultrasonic wave at one point,
and the reception of the disk-shaped ultrasonic transducer and the ring-shaped ultrasonic
transducer A switching circuit for switching the signal and an adder for adding the switched
received signal are provided. At the time of transmission, all ultrasonic transducers transmit
waves only when the test area is deep, and in the other areas, the disk Only the acoustic wave
transducer, or the ring-shaped ultrasonic transducer placed inside with the disc-like ultrasonic
transducer, and transmit at the time of reception, use the switching circuit and the adder, and as
the receiving area gets deeper, The From click-like ultrasonic transducers alone, in which to
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obtain the received signal while adding a ring arranged sequentially inside the disk-shaped
ultrasonic vibrator shaped ultrasonic oscillator.
In addition, a disk-shaped ultrasonic transducer, and at least one ring-shaped ultrasonic
transducer concentric to the disk-shaped ultrasonic transducer and having an ultrasonic
radiation surface in the same plane, and both of these Acoustic lens disposed on the ultrasonic
radiation surface of the ultrasonic transducer and having a geometrical focus for focusing the
ultrasonic wave at one point, these disk-like ultrasonic transducer, ring-like ultrasonic transducer
and acoustic lens A rotor in which two or more pairs of ultrasonic transmitting and receiving
elements are arranged so that the ultrasonic emitting surfaces are on the same plane and the
emitting ultrasonic beams are at regular intervals, the disk-like ultrasonic transducer and the
ring-like ultrasonic wave A switching circuit for switching the received signal of the transducer
and an adder for adding the switched received signal are provided, and at the time of
transmission, all ultrasonic transducers transmit waves only when the test region is deep, and
other regions Is transmitted by the disk-shaped ultrasonic transducer only, or by the disk-shaped
ultrasonic transducer and the ring-shaped ultrasonic transducer arranged inside, and at the time
of reception, using a switching circuit and an adder, the reception area is deep As a result, from
the disc-shaped ultrasonic transducer alone, the reception signal is obtained while adding the
ring-shaped ultrasonic transducer arranged inward sequentially to the disk-shaped ultrasonic
transducer. Therefore, according to the present invention, since the acoustic lens is disposed on
the ultrasonic wave emitting surface of the disk-shaped ultrasonic transducer and the ringshaped ultrasonic transducer, ultrasonic waves can be generated without using a conventional
delay circuit. Since the ultrasonic waves are focused by the acoustic lens in this way, the diameter
of the disk-shaped ultrasonic transducer is reduced, and the width of the ring-shaped ultrasonic
transducer is not narrowed. The phase shift of the received ultrasonic echo signal in the disk
surface and the ring width can be reduced, and furthermore, the number of ring ultrasonic
transducers can be reduced and the shape can be reduced. In addition, an acoustic lens is
disposed on the ultrasonic radiation surface of the disk-shaped ultrasonic transducer and the
ring-shaped ultrasonic transducer, and the actual ultrasonic beam is focused compared to the
focal length determined by the geometric shape of the acoustic lens. The positions are different
and always closer than the geometrical focal length of the acoustic lens. This tendency becomes
closer as the aperture diameter of the ultrasonic transducer transmitting and receiving the
ultrasonic wave becomes smaller. Therefore, the focus position of the actual ultrasonic beam is
controlled by switching the disk-shaped ultrasonic transducer and the ring-shaped ultrasonic
transducer to be used by the switching circuit and switching the effective aperture diameter. In
other words, by setting the aperture diameter in accordance with the depth of the measurement
position, it is possible to make the ultrasonic beam at the measurement point the narrowest and
increase the resolution.
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Further, as described above, since the ultrasonic transmitting / receiving element consisting of
the disk-shaped ultrasonic transducer, the ring-shaped ultrasonic transducer and the acoustic
lens can be miniaturized with high resolution, the two sets of rotating rotors Even if the above
ultrasonic transmitting and receiving elements are arranged so that the emitted ultrasonic beams
are equally spaced, the size can be sufficiently reduced to a practical size, and the frame rate of
the image can be increased. Examples of the present invention will be described below with
reference to the drawings. First, the first embodiment of the present invention will be described.
1 (a) and 1 (b) show the configuration of the ultrasonic transducer used for the ultrasonic probe
in the first embodiment of the present invention, and FIG. 1 (a) is a perspective view, FIG. b) is a
cross sectional view. In FIGS. 1 (a) and 1 (b), reference numeral 1 denotes an ultrasonic
transducer, which is concentric with the disk-shaped ultrasonic transducer 2-1 and the diskshaped ultrasonic transducer 2-1 (in the ring One or more (one in the illustrated example) ringshaped ultrasonic transducer 2-2, the center of curvature of which coincides with the center of
the disk-shaped ultrasonic transducer 2-1, and the ultrasonic radiation surface is in the same
plane And an acoustic lens disposed on the ultrasonic radiation surface of the disk-shaped
ultrasonic transducer 2-1 and the ring-shaped ultrasonic transducer 2-2 and having a
geometrical focus for focusing the ultrasonic waves at one point. It consists of three. As an
example, the disk-shaped ultrasonic transducer 2-1 and the ring-shaped ultrasonic transducer 22 are both made of lead titanate based piezoelectric ceramics, and the outer diameter of the diskshaped ultrasonic transducer 2-1 is 12 The outer diameter of the ring-shaped ultrasonic
transducer 2-2 was set to 19 times, and the thickness was set to 0.65 in all cases. Therefore,
although the band characteristics of the disk-shaped ultrasonic transducer 2-1 and the ringshaped ultrasonic transducer 2-2 are slightly different, the center frequencies of the bands are
almost the same, 3.5 MHz. The acoustic lens 3 is a concave lens made of polystyrene whose
ultrasonic longitudinal wave velocity in itself is faster than the acoustic velocity (about 1540 m /
see on average) of the living body, which is the propagation medium of ultrasonic waves in actual
use conditions. Disc-like ultrasonic transducer 2-1 which comprises the ultrasonic transmitting
and receiving element 1 with two sine wave transmission waveforms of 0 frequency 3.5 MHz in
which the focal length of the concave lens determined from the geometrical shape is set to 110
朋. 1 and the ring-shaped ultrasonic transducer 2-2 at the same time, when the echo echo signal
to be reflected is received by both the disk-shaped ultrasonic transducer 2-1 and the ring-shaped
ultrasonic transducer 2-2 The sound field distribution as the transmission / reception
characteristic indicating the sensitivity distribution of the reflection point is as shown in FIG.
In FIG. 2, the vertical axis represents the center of the ultrasonic transmitting / receiving element
1, that is, the distance in the radial direction with the centers of the disk ultrasonic transducer 21 and the ring ultrasonic transducer 2-2 as the origin. And the horizontal axis is the distance (in
mm) in the radial direction on the ultrasonic radiation surface of the ultrasonic transducer 1 as
the center of the ultrasonic transducer 1. The curve shown in FIG. 2 represents an ultrasonic
beam, and in the cross section at each distance, shows the position where the sensitivity is
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lowered by 1 / 2.6 dB from the highest sensitivity to the highest sensitivity. As apparent from
FIG. 2, at the position where 77 朋 is the narrowest position of the ultrasonic beam, the
ultrasonic beam becomes thicker in proportion to the distance as it gets farther than this
position, but the ultrasonic beam becomes as near 7 Qxm Spreads rapidly. The smaller the
ultrasonic beam diameter, the better the resolution can be, but it is usually desirable to use an
anila array ultrasound probe for mechanical sector scanning, so the ultrasonic beam is
proportional to the distance. Even if it gets thicker, there is no extreme problem, but as above the
ultrasonic beam becomes extremely thick 5 above 7 Qmi and the scanning line density by sector
scanning becomes high, so the image in this area is It will deteriorate extremely. On the other
hand, when only the disk-shaped ultrasonic transducer 2-1 of the ultrasonic transmitting /
receiving element 1 is driven by the transmission waveform of two sine waves having a
frequency of 3.5 MHz and received by only the disk-shaped ultrasonic transducer 2-1. The
sensitivity distribution of is shown in FIG. In FIG. 3, the definitions of the vertical axis and the
horizontal axis are the same as in FIG. The ultrasonic beam pattern representing the sensitivity
distribution shown in FIG. 3 is similar to the beam pattern shown in FIG. It can be seen that the
resolution of the region of about 2 to 4 mm of 45 to 70 rnx is improved in the portion closer
than 70% where image degradation is clearly recognized. Therefore, transmission and reception
are performed by both the disk-shaped ultrasonic transducer 2-1 and the ring-shaped ultrasonic
transducer 2-2 in the region farther than 70%, and in the region closer than 70%, the disk-shaped
ultrasonic transducer By performing transmission and reception only by 2-1, high resolution
transmission and reception can be performed in a wide area. Here, it is important to determine
the resolution in the far distance is the maximum aperture diameter (19 朋 in this embodiment),
the larger the maximum aperture diameter, the higher the resolution in the vicinity of the
geometrical focus of the acoustic lens 3 However, when it becomes too large, the resolution of
the area other than near the geometrical focus of the acoustic lens 3 is rapidly degraded.
From this point of view, the maximum aperture diameter is generally set to a constant of 1 to 3
as defined below. Here, A is the aperture diameter, F is the geometrical focal length of the lens,
and λ is the wavelength of ultrasonic waves (in the present embodiment, 0.44 朋). In the present
embodiment, the constant is set to an appropriate value of 1.86. Although it is the smallest
aperture diameter (12 mm in this embodiment) which determines the resolution in the vicinity,
the geometrical focal length of the acoustic lens 3 is fixed, and it is true even if the smallest
aperture diameter is reduced. However, the aperture diameter is too small, so that the ultrasound
beam can not be focused, and as a result, the ultrasound beam spreads. The minimum opening
diameter is a constant value of 0.5 to 1.0, which is an appropriate value of 0.74 in this
embodiment. However, it can be understood from the comparison between FIG. 2 and FIG. 3 that
even if transmission and reception are performed with the intermediate aperture diameter, there
is nothing newly obtained in the obtained ultrasonic beam pattern, and the embodiment of the
present invention shown in FIG. As in the configuration, it is sufficient to divide the two
ultrasonic transducers into one disk-shaped ultrasonic transducer 2-1 and one ring-shaped
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ultrasonic transducer 2-2, according to this configuration, It can be seen that the resolution of
the image is improved. From this, as described above, the ring-shaped ultrasonic transducer 22 is
arranged by arranging the acoustic lens 3 on the ultrasonic wave emitting surface of the diskshaped ultrasonic transducer 2-1 and the ring-shaped ultrasonic transducer 2-2. The number of
rings is one, which makes it possible to make the shape of the ultrasonic transducer 1 relatively
small, also facilitates mechanical processing, and has a small number of electrodes, and it is
possible to draw the electrode wires. Also, the handling becomes easy. Also, of course, expensive
delay circuits are not required. As described above, according to the present embodiment, the
disk-shaped ultrasonic transducer 2-1 and the ring-shaped ultrasonic transducer 2-2 are
disposed concentrically, and the acoustic lens 3 is disposed on the ultrasonic radiation surface
thereof. Thus, high resolution can be achieved without requiring an expensive delay circuit, and
cost reduction can be achieved. Still, since the number of ring-shaped ultrasonic transducers 2 =
2 can be reduced and the overall shape can be reduced, mechanical processing, electrode
routing, and handling can be easily performed. Next, a second embodiment of the present
invention will be described. FIG. 4 is a block diagram showing an ultrasonic probe according to a
second embodiment of the present invention. In FIG. 4, reference numeral 1 denotes an
ultrasonic transducer, which is concentric with the disk-shaped ultrasonic transducer 2-1 and the
disk-shaped ultrasonic transducer 2-1, and the ultrasonic emitting surface is the same plane.
Ultrasonic emission surface of one or more (one in the illustrated example) ring-shaped
ultrasonic transducers 2-2 inside the disk-shaped ultrasonic transducer 2-1 and the ring-shaped
ultrasonic transducers 2-2 It consists of an acoustic lens 3 arranged on top and having a
geometrical focus for focusing the ultrasound into one point.
4-1 and 4-2 are switching circuits for switching the reception signals of the disk-shaped
ultrasonic transducer 2-1 and the ring-shaped ultrasonic transducer 2-2, and 5 is switched by the
switching circuit 4-1.4-2. It is an adder that adds received signals. In the first embodiment
described above, the transmission and reception are switched to be the same diameter between
transmission and reception completely depending on the area to be measured, and the resolution
is increased in that area. This method is not always effective when measuring over a wide area at
once, and if it is intended to be used intentionally, it is transmitted by the disc-shaped ultrasonic
transducer 2-1, and the disc-shaped ultrasonic transducer 2- The image received in 2 is used as
the image for short distance and transmitted by the disk ultrasonic transducer 2-1 and the ring
ultrasonic transducer 2-2, and the disk ultrasonic transducer 2-1 and the ring ultrasonic It is
possible to combine two images as an image for far distance by combining the image received by
the vibrator 22 into one screen, but to transmit twice, the frame rate of the image is halved Not
only falls and crawls but also runs mechanically Because performed independently of the
transmission and reception of ultrasonic waves, the first transmission direction and the second
transmission direction of displacement, the two images are shifted. Therefore, in the present
embodiment, the switching circuit 4-1.4-2 and the adder 5 are used, and at the time of
transmission, transmission is performed using only the disk-shaped ultrasonic transducer 2-1,
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and at the time of reception, the near field is obtained. Is switched so that only the disk-shaped
ultrasonic transducer 2-1 is received by the disk-shaped ultrasonic transducer 2-1 and the ringshaped ultrasonic transducer 2-2 for a long distance. FIG. 5 shows the sensitivity distribution
when transmitted by the disk-shaped ultrasonic transducer 2-1 and received by the disk-shaped
ultrasonic transducer 2-1 and the ring-shaped ultrasonic transducer 2-2. In FIG. 5, the vertical
axis and the horizontal axis are the same as in FIG. 2 and FIG. The ultrasonic beam pattern of the
sensitivity distribution shown in FIG. 5 is transmitted by the disk-shaped ultrasonic transducer 21 and the ring-shaped ultrasonic transducer 2-2 shown in FIG. 1 and the position of the minimum
ultrasonic beam diameter are slightly closer compared to the sensitivity distribution when
received by the ring-shaped ultrasonic transducer 2-2, and the positions of the minimum
ultrasonic beam diameter and the minimum ultrasonic beam diameter are far Although the
diameter of the ultrasonic beam at distance is slightly larger, conversely, the diameter of the
ultrasonic beam in the region closer to the minimum ultrasonic beam diameter is smaller, and
deterioration of the ultrasonic beam pattern is generally seen as a whole. Absent. However,
compared with the sensitivity distribution when transmitted by the disk-shaped ultrasonic
transducer 2-1 shown in FIG. 3 and received by the disk-shaped ultrasonic transducer 2-1, a
beam of 40 to 7 Q mm in area The diameter of the ultrasonic beam in Fig. 5 is larger than that in
Fig. 5. The ultrasonic beam pattern in Fig. 3 is used in the area closer than 70, and the ultrasonic
beam pattern in Fig. 5 is used in the area farther than 70 朋. Is desirable.
According to this embodiment, the transmission is performed by the disk-shaped ultrasonic
transducer 2-1, and the reception is performed by the disk-shaped ultrasonic transducer 2-1 in a
close range up to 70 battles, and the far-off after 7 Q mm. In the area of the distance, this can be
realized by switching with the switching circuit 4-L 4m-2 to be received by the ring-shaped
ultrasonic transducer 2-2, and a wide range can be measured at once with high resolution. As
described above, according to the present embodiment, by adding the switching circuit 4-1.4-2 to
the configuration of the first embodiment, high resolution can be realized without requiring an
expensive delay circuit. As the cost can be reduced, the number of ring-shaped ultrasonic
transducers 2-2 can be reduced, and the overall shape can be reduced. Therefore, mechanical
processing, routing of electrodes, and handling can be performed. It can be easily performed, and
a high quality diagnostic image can be obtained over a wide range at a degree. Next, a third
embodiment of the present invention will be described. FIG. 6 is a side view showing an
ultrasonic probe according to a third embodiment of the present invention. In FIG. 6, las 1b 11c
is an ultrasonic transducer, and each of the disk-shaped ultrasonic transducer 2-1 and the diskshaped ultrasonic transducer 2-1 are concentrically and respectively radiated to the ultrasonic
transducer One or more (one in the illustrated example) ring-shaped ultrasonic transducer 2-2
having a plane in the same plane, and the disk-shaped ultrasonic transducer 2-1 and the ringshaped ultrasonic transducer 2-2 It comprises the acoustic lens 3 disposed on the ultrasonic
radiation surface. A rotor 6 mounts the three sets of ultrasonic transmitting and receiving
elements 1a and 1b 11c so that the ultrasonic emitting surfaces are on the same plane and that
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the emitted ultrasonic beams are equally spaced. Further, the respective disk-shaped ultrasonic
transducers 2-1 of the ultrasonic transmitting / receiving elements Ia, lb, 1c and the ring-shaped
ultrasonic transducer 2-2 are connected to the linear switching circuit 4- as in the second
embodiment. 1.4-2 and the adder 5 are connected. Ultrasonic transducer 1a attached to the rotor
6. The Ib and IC have exactly the same configuration as the first and second embodiments, and
have the / h type and high resolution. And, by rotating the rotor 6, a sufficient frame rate can be
obtained, and from the feature that it is compact, even if the three elements 1a, lb, lc are attached
to the rotor 6, the size is sufficiently reduced. And it becomes easy to handle as an ultrasound
probe. In addition, a rotary transformer or slip ring is usually used as an electric signal
transmission means with the ultrasonic transmitting and receiving elements 1a, 1b and 1c
attached to the rotor 6, but the ultrasonic transmitting and receiving elements 1a- and Ib 51c are
disks. The ultrasonic transducer 2-1 and the ring-shaped ultrasonic transducer 2-2 consist of
only two ultrasonic transducers, so three sets of ultrasonic transducers 1a.
Even in the configuration in which 1b and 1c are attached, the ultrasonic vibration of each
ultrasonic transducer 1a, 1b, 1c, 1 c, 1 c, 1 c, with 6 pairs of electric signal transmission means,
that is, 6 rotary transformers, or 12 slip rings. It is possible to transmit the signals of the child
completely independently, and it is sufficiently possible to incorporate six rotary transformers,
still as many as twelve slip rings, into the interior of the rotor 6. Further, the switching circuit 41.4-2 is installed after a rotary transformer, slip ring or the like. As described above, according to
the present embodiment, the disk-shaped ultrasonic transducer 2-1 and the ring-shaped
ultrasonic transducer 2-2 are disposed concentrically, and the acoustic lens 3 is disposed on the
ultrasonic radiation surface thereof. Several sets of ultrasonic transmitting and receiving
elements 1a. By attaching lb and Ic to the rotating rotor 6, high resolution and cost reduction can
be achieved without requiring an expensive delay circuit. Still, since the number of ring-shaped
ultrasonic transducers 2-2 can be reduced and the overall shape can be reduced, mechanical
processing, electrode routing and handling can be easily performed, and a high frame rate Can be
realized. Next, a fourth embodiment of the present invention will be described. FIG. 7 is a crosssectional view showing an ultrasonic transducer used for an ultrasonic probe in the fourth
embodiment of the present invention. In each of the first to third embodiments, a concave lens is
used as the acoustic lens 3. However, in the present embodiment, as a material of the acoustic
lens 3, a material slower than the sound velocity in the living body such as silicone rubber is
used. Thus, the acoustic lens 3 is configured as a convex lens, and the other configurations and
effects are the same as those of the above embodiments. In each of the first to fourth
embodiments, the maximum aperture diameter of the ultrasonic transmitting / receiving element
1 is set to 19 and therefore the case where only one ring-shaped ultrasonic transducer 2-2 is
used has been described. However, if the maximum aperture diameter is further increased, the
number of ring-shaped ultrasonic transducers 2-2 will be increased to two or more. In the third
embodiment, three ultrasonic transmitting and receiving elements 1a, 1b and 1c are attached to
the rotor 6. However, from the viewpoint of the goodness of handling as an ultrasonic probe, the
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image frame rate, etc. The number of ultrasonic transmitting and receiving elements may be two
or four or more. As described above, according to the present invention, since the acoustic lens is
disposed on the ultrasonic radiation surface of the disk-shaped ultrasonic transducer and the
ring-shaped ultrasonic transducer, an expensive delay circuit is not used. Also, the ultrasound can
be focused, and the cost can be reduced.
In addition, since the ultrasonic waves are focused by the acoustic lens as described above, the
diameter of the disk-shaped ultrasonic transducer is reduced and the width of the ring-shaped
ultrasonic transducer is not narrowed, but within the disk surface and the ring width. The phase
shift of the received ultrasonic echo signal can be reduced, and furthermore, the number of ringshaped ultrasonic transducers can be reduced and the shape can be reduced, so that processing,
electrode routing, and handling are easy. It becomes. Still, an acoustic lens is disposed on the
ultrasonic wave emitting surface of the disk-shaped ultrasonic transducer and the ring-shaped
ultrasonic transducer, and at the time of reception, the disk-shaped ultrasonic transducer and the
ring-shaped ultrasonic transducer to be used are switched By switching and setting the aperture
diameter according to the depth of the measurement position, the ultrasonic beam at the
measurement point is made the narrowest, high resolution is achieved, and high quality
diagnostic images are obtained over a wide area at one time. Can. Further, as described above, by
arranging two or more sets of small-sized, high-resolution ultrasonic transmitting and receiving
elements consisting of a disk-shaped ultrasonic transducer, a ring-shaped ultrasonic transducer,
and an acoustic lens on a rotating rotor, Frame rate can be increased, and high-quality images
can be obtained without flicker.
[0002]
Brief description of the drawings
[0003]
1 (a) and 1 (b) show the configuration of the ultrasonic transducer used in the ultrasonic probe in
the first embodiment of the present invention, and FIG. 1 (a) is a perspective view, FIG. 1 (b) FIG.
2 is a cross-sectional view, and FIG. 2 shows the case where the disk-shaped ultrasonic
transducer and the ring-shaped ultrasonic transducer are transmitted in the first embodiment
and received by the disk-shaped ultrasonic transducer and the ring-shaped ultrasonic transducer
Fig. 3 is a beam pattern diagram showing the sensitivity distribution of Fig. 3 is a beam pattern
diagram showing the sensitivity distribution when transmitted by the disk ultrasonic transducer
and received by the disk ultrasonic transducer in the first embodiment. FIG. 4 is a block diagram
showing an ultrasonic probe according to a second embodiment of the present invention, and
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FIG. 5 is a disk-shaped ultrasonic wave transmitted by a disk-shaped ultrasonic transducer in the
second embodiment. Beam pattern diagram showing sensitivity distribution when received by the
transducer and ring ultrasonic transducer FIG. 6 is a side view showing an ultrasonic probe in the
third embodiment of the present invention, and FIG. 7 is a configuration of an ultrasonic
transducer used in the ultrasonic probe in the fourth embodiment of the present invention. FIG. 8
is a sectional view showing a conventional ultrasonic probe.
1, la, lb, lc: ultrasonic transducer, 2-1: disk-like ultrasonic transducer, 2-2: ring-like ultrasonic
transducer, 3: acoustic lens, 4- 1.4-2 ... switching circuit, 5 ... adder, 6 ... rotor. Ku 彬 鋺 媛 峙 total
measure!
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