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JPS63117734

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DESCRIPTION JPS63117734
[0001]
[Object of the Invention] (Industrial field of application) The present invention relates to an
ultrasonic probe device that facilitates detection of Doppler information on a target site of a
subject. (Prior Art) FIGS. 9 to 11 show a conventional example of an ultrasonic probe apparatus
in which an ultrasonic probe and an ultrasonic coupler are combined. The ultrasonic probe
apparatus 2o shown in FIG. 9 has an ultrasonic wave transmitting / receiving function of
ultrasonic wave, an ultrasonic wave probe 21 attached to the ultrasonic wave probe 21, and a
contact surface 24 to the body surface 25 of the subject M. And an ultrasonic turner 22
containing an acoustic medium such as water inside. And since this ultrasonic coupler 22 uses a
soft storage body containing, for example, an ice bag and a soft colloidal substance, it has
flexibility, and the shape of the contact surface 23 is that of an ultrasonic beam. It has a flat
symmetrical shape or a free deformation with respect to the center line BMc in the scanning
plane. Further, as shown in FIG. 10, there is also known one having an ultrasonic coupler 22a in
which the contact surface 24a has a predetermined curved shape in order to perform a convex
scan on the subject. However, by using the ultrasonic probe device 20 provided with the abovementioned ultrasonic coupler 22 (or 22a), for example, as shown in FIG. 11, peripheral blood
vessels such as carotid arteries which run substantially parallel to the body surface 25 of the
subject M Doppler information on the 26 (F F 'T Doppler information. When trying to obtain twodimensional color Doppler information, there is a problem that the accuracy of the Doppler
information in the central portion of the most important ultrasonic beam BM, ie, the central
portion of the target portion 27, is low or can not be measured. This is due to the principle of the
Doppler effect. That is, the relationship between the Doppler shift frequency fd and the blood
flow velocity V is given by the following equation when the angle between the ultrasonic beam
and the blood flow is α. 2 V cos α fd = f (f: drive frequency, C: sound velocity in the subject)
Therefore, at the target site 27 located as described above, the angle α between the blood flow
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and the ultrasonic beam BM becomes 90 ° Therefore, fd = Q and measurement of blood flow
velocity becomes impossible. In addition, multiple reflection of ultrasonic echoes due to the fact
that the contact surface 24 of the ultrasonic coupler 22 is flat and has symmetry is one of the
causes. (Problems to be Solved by the Invention) As described above, in the conventional
ultrasonic probe apparatus, there is a problem that it is difficult to obtain accurate Doppler
information particularly on the central part of the target site. Therefore, an object of the present
invention is to provide an ultrasonic probe apparatus capable of detecting accurate Doppler
information also at the central part of a target site.
[Configuration of the Invention] (Means for Solving the Problems) The present invention relates
to an ultrasonic probe apparatus having an ultrasonic probe and an ultrasonic coupler, wherein
the contact surface of the ultrasonic coupler to the object surface of the ultrasonic coupler is It is
configured by inclining with respect to the center of the ultrasonic beam emitted from the
acoustic probe. (Operation) The ultrasonic probe apparatus having the above-described
configuration operates as follows. That is, since the contact surface of the ultrasonic coupler
formed in this device forms an inclined surface with respect to the center of the scanning surface
by the ultrasonic beam, the inclination angle at which the ultrasonic beam at the center of the
scanning surface is with respect to the target region of the object Incident with. As a result, the
angle α based on the Doppler effect does not become 90 ', and the Doppler shift frequency fd
can be determined. EXAMPLES Examples of the present invention will be described below. The
ultrasonic probe apparatus 10 shown in FIG. 1 is configured to include an ultrasonic probe 1
having an ultrasonic wave transmitting / receiving function, and an ultrasonic coupler C attached
to the ultrasonic probe 1. The ultrasonic coupler C has a fishing rod 2a at its upper portion as
shown in FIG. A mounting portion 2 composed of 2a is provided, and by engaging both the
fishing pieces 2a, 2a of this mounting portion with the side wall of the tip portion of the
ultrasonic probe 1, the mounting can be made to the ultrasonic probe 1. In addition, the contact
surface 3 of the ultrasonic coupler C has a predetermined curvature such that the inclined
surface has an inclined surface inclined at an arbitrary angle (for example, 60 °) with respect to
the center line BMc of the ultrasonic beam BM. Are configured to form a convex curved shape.
Further, as clearly shown in FIG. 2, the ultrasonic coupler C has a cross-sectional shape in a
direction orthogonal to the scanning direction of the ultrasonic probe 1 from the width W of the
mounting portion 2 to the ultrasonic probe 1 to the body surface. The width W of the contact
surface 3 is in the form of a small size. That is, as shown in FIG. 4, in the cross-sectional shape,
the width of the contact surface 3 to the body surface is larger than the width of the mounting
portion 2 to the ultrasonic probe 1 along the ultrasonic beam BM from the ultrasonic probe 1
The shape is tapered and becomes smaller. The ultrasonic coupler C has, for example, an outer
shell thereof formed of plastic and accommodates water or other contents as an acoustic
medium, or is formed of a colloidal solid and its holder. When water or other content liquid is
accommodated as an acoustic medium, the contact surface 3 with the body surface is made of a
silicone rubber film. Furthermore, as shown in FIG. 4, in the ultrasonic coupler C of the present
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embodiment, an acoustic lens 8 is provided in the mounting portion 2 to the ultrasonic probe 1,
and the curvature radius of the upper side 8 a of the acoustic lens 8 is set to the ultrasonic probe
1. The focus point P 'of the lens focus is moved closer to the focus point P of the ultrasonic probe
itself by making the curvature radius of the lower side 5b smaller than the curvature radius of
the acoustic lens.
In addition, it is preferable to interpose a suitable acoustic coupling agent (for example, jelly etc.)
between the ultrasonic probe 1 and the acoustic lens 8. Next, the operation and effect of the
ultrasonic ultrasonic probe apparatus 10 of the above configuration are compared with the
conventional apparatus! explain. (A) As shown in FIG. 3, for example, when it is intended to
detect the Doppler information of the carotid artery 6 running parallel to the body surface of the
subject M by this ultrasonic probe device 10, the ultrasonic probe 1 sends Since the center line
BMc of the ultrasonic beam BM to be waved is inclined with respect to the target site 7 of the
carotid artery 6, the entire shape of the ultrasonic coupler C is asymmetrically arranged with
respect to the central axis BMc, whereby the Doppler effect is achieved. It is possible to
determine the Doppler displacement frequency fd when the base angle α does not reach 90 °,
and the reflection echo from the target site 7 does not cause multiple violations in the ultrasonic
coupler C. As a result, the Doppler information on the target site 7 can be detected accurately. In
general carotid artery diagnosis, the part and internal artery branching from the common carotid
artery to the internal artery and external artery are important, but depending on the subject,
their positions are reduced, and they are considerably elevated, ie, in the jaw In some cases, the
ultrasound beam BM needs to be emitted obliquely upward from the neck. In such a case, in the
apparatus of this embodiment, the inclined contact surface 3 makes it easy to radiate the
ultrasonic beam obliquely upward as shown in FIG. C) Since the contact surface 3 to the body
surface 4 is a convex curved shape having a predetermined curvature, the transmittance of the
ultrasonic beam 8M at the contact surface 3 to the body surface 4 is improved, and the reflection
is correspondingly The echo is weak. Therefore, the multiple reflection on the side surface of the
ultrasonic coupler is reduced, and the contact surface 3 to the body surface 4 is formed into a
convex curved shape having a predetermined curvature. Is significantly improved. That is, since
the width W of the contact surface 3 to the body surface 4 in the cross-sectional shape in the
direction orthogonal to the scanning direction A (shown in FIG. 7) of the ultrasonic probe 1 is
smaller than the conventional one, as shown in FIG. The friction when moving in the direction of
the arrow E on the body surface 4 is small and easy to operate, and as shown in FIG. 6, when the
body surface 4 is rotated as a pivot, biting into the body is smooth and sufficient contact Sex is
obtained. In contrast, as shown in FIGS. 7 and 8, the conventional ultrasonic coupler 22 has a
cross-sectional shape in the scanning direction A of the ultrasonic probe 21 (FIG. 7) and a cross
section in the direction orthogonal to the scanning direction A. Since the shape (FIG. 8) is all
rectangular, the width W1 of the contact surface 24 to the body surface 4 is large, the friction is
large when moving on the body surface, and operation is difficult, and the body surface is
pivoted When it was turned, there was a problem that biting into the body was insufficient and
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the contact was bad.
In FIG. 5, 7 is a target portion. (=) The acoustic lens 8 is provided in the mounting portion 2 to
the ultrasonic probe 1, and the curvature radius of the upper side 8a of the acoustic lens 8 is
matched with the curvature radius of the acoustic lens 8 of the ultrasonic probe 1, and the
curvature of the lower side 8b Since the focus point P 'of the lens focus is moved closer to the
focus point P of the ultrasonic probe itself by making the radius smaller, the image quality of
superficial organs (eg, thyroid and carotid arteries) can be improved. I12 end can be made with a
wide field of view. That is, the conventional ultrasonic coupler 22 generally has an effect of
bringing the focus point closer to the vicinity of the body surface, but the focal length of the
ultrasonic probe 21 itself, the size (water depth) of the ultrasonic coupler 22 and the depth of the
region of interest Depending on the situation, the focus point and the region of interest may not
coincide when the ultrasonic coupler is attached. For example, if the lens focus of the ultrasound
probe itself is 6 cm, the depth of the ultrasound coupler water depth and the region of interest
are both 2 cm, the focus point and the region of interest deviate 2 cm, which causes nonnegligible image quality degradation . Basically, if the water depth of the ultrasonic coupler 22 is
increased, the above problem will be solved, but if the ultrasonic coupler 22 is enlarged, the
operability deteriorates, and if the water depth is increased, the window material (body surface
There is a problem that an artifact due to multiple reflections of the member forming the contact
surface to the surface becomes an obstacle to diagnosis (following). Furthermore, it is
conceivable to mount only the acoustic lens without mounting the ultrasonic coupler on the
ultrasonic probe 21. In this case, the image of the region of interest is displayed above the sectorlike image, There is a problem that the field of view is narrowed. On the other hand, in the
present embodiment, the mounting portion 2 to the ultrasonic probe 1 is provided with the
acoustic lens 8 and the curvature radius of the upper side of the acoustic lens 8 is matched with
the curvature radius of the acoustic lens of the ultrasonic probe 1. Since the focus point P 'of the
lens focus is moved closer to the focus point P of the ultrasonic probe itself by making the radius
of curvature of the lens smaller, it is possible to observe the superficial organ with high image
quality and wide field of view. it can. The present invention is not limited to the embodiments
described above, and it goes without saying that various modifications can be made within the
scope of the invention. For example, it can also be implemented by integrally incorporating an
ultrasonic coupler inside the ultrasonic probe. [Effects of the Invention] According to the present
invention described in detail above, by making the contact surface of the ultrasonic coupler
inclined with respect to the center of the ultrasonic beam in the ultrasonic beam scanning plane,
the Doppler information of the central portion of the target region is It is also possible to provide
an ultrasonic probe device that can be properly detected.
[0002]
Brief description of the drawings
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[0003]
FIG. 1 is a front view showing an apparatus according to an embodiment of the present
invention, FIG. 2 is a side view of an ultrasonic coupler of the apparatus, FIG. 3 is a side view
showing the use of @ 1 apparatus, and FIG. 5 and 6 show the operation of the apparatus, and
FIGS. 7 and 8 show a schematic front view and a side view of a conventional ultrasonic coupler
equipped with an ultrasonic probe. Fig. 9 shows a state in which the conventional ultrasonic
coupler is attached to the ultrasonic probe. Fig. 10 shows a state in which the ultrasonic probe
for convex scan is attached to the ultrasonic probe. It is a front view which shows the use
condition of the ultrasonic probe and ultrasonic coupler which are shown in FIG.
10 ... ultrasonic probe device, 1 ... ultrasonic probe, 2 ... mounting part, 3 ... contact surface, C ...
ultrasonic coupler. / Z 'Fig. 4 Fig. 11
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