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JPS5822043

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DESCRIPTION JPS5822043
[0001]
The present invention relates to an ultrasound probe used in an ultrasound diagnostic apparatus.
2. Description of the Related Art Conventionally, the scanning method of a probe that is
performed when obtaining a tomogram of a subject with an ultrasonic diagnostic apparatus is 1.
Mainly, the linear scanning method and the sector scanning method can be roughly divided. The
sector scanning method is suitable for chest imaging and the like, but has the following five
disadvantages as compared to the linear scanning method. (1) In the case of the electronic sector
scanning method (four electronic circuits are huge and complicated, and the price of the entire
apparatus is high. (B) When trying to scan a sector up to a large twist angle, sensitivity to a
sound wave of a large angle is insufficient, so it is difficult to obtain a high quality image. (2) In
the case of the horizontal scan sector scanning method (6) Since the ultrasonic relaxation
element is moved by a motor or the like, the probe as a whole has a large shape. (B) Unable to
scan with any initial letter. (C) Scan speed is slow. In order to solve such a point, an ultrasonic
probe capable of IJ near-sector conversion as shown in FIG. 1 (patent 1 @ 56-5498 and an
application filed by the same applicant as the present application) There is Sho 54-7729a). In
FIG. 1 (a), 10 is a probe for linear electronic scanning composed of an array, a vibrator 11 and a
backing material 12, and a packing material is placed on the JI surface of the array vibrator
arranged in a plane. Is glued. 2 o is a linear sector conversion lens, and 30 is a propagation
medium. The acoustic beam V + of the array pregnancy mover 11 lens 20, the sound wave V + of
the lens 2o, and the sound velocity v2 of the propagation medium 30 are appropriately selected
to pass the lens 20, and then the acoustic beam is transmitted to the center of the lower end face
of the propagation medium 30 Can be focused. In the case of the concave-lens linear sector
conversion lens shown in FIG. 1 (b), vl> v, and the curved surface 21 of the lens 2o is in the X-7
axis as shown in FIG. 2 (c) k. On the other hand, it is formed into an elliptic curve satisfying the
following equation. An arc curve may be substantially sufficient instead of the elliptic curve. Due
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to such a curved surface, the sound wave beam travels straight to be focused on the focal point
Pf. When the array transducer 11 is linearly scanned, the sound beams II and Bb become sector
scans with respect to the subject 40 as illustrated. In the case of the convex-lens-like linear sector
conversion lens shown in FIG. 1 (b), vl v v 2 and the shape of the curved surface 21 of the lens
201 are as shown in FIG. Is formed into a hyperbola satisfying the following equation. Also in this
case, in place of the hyperbolic curve, it can be approximated by an arc curve having a radius of
curvature R represented by the following equation.
n−f(! -1) 1) Then, when the array transducer 11 is linearly scanned, an acoustic beam la
generated as shown in (b) k of FIG. Bb is a sector scan of the object as in the case of (A) of FIG.
Furthermore, when combining a linear sector conversion lens and a propagation medium with a
linear scanning probe and using k, the sound beam emitted from the real IIK probe is a sector
while the perturbation is linear scanning. It is an ultrasonic probe that is extremely effective in
practical use as it is scanning. However, the linear sector conversion lens 20 ° 201 is the first!
S5i! As indicated by lk, no lens plays a role in the thickness direction (two directions), and
the beam in the thickness direction is not crested. For this reason, there is a problem that the
sound wave beam spreads, and an ultrasonic image with high resolution in the thickness
direction can not be obtained. An object of the present invention is to provide an ultrasonic probe
capable of linear sector conversion capable of improving resolution in the thickness direction by
using a linear sector conversion lens having lens effects in the thickness direction. There is K to
offer. The present invention will be described below based on the drawings. FIG. 4 is a view
showing only the cross-sectional shape of the ultrasonic probe according to the present invention
particularly in the thickness direction of + 7 = a-sector conversion lens. The present invention is
similar to the probe shown in FIG. 1 except that it uses a linear sector conversion lens having its
own image as shown in FIG. (A) of FIG. 4 shows the lens shape in the case of v1 to v2, and (c4 in
FIG. 4 shows the lens shape in the case of v1 to v2). The equation of the curved surface of the
lens 200 shown in FIG. 4 (C) K, where f is the focal length! It becomes a hyperbola given. When
the opening is small, it can be approximated by a circular arc, and its radius R is given by n−t
(and −1) vl. Further, the equation of (curve of lens 20 ° indicated by +4 K) in FIG. 4 is an ellipse
given by In addition, when the opening is small, it can be approximated by a circle, and its radial
wing is 訃, B1--! L) Given 1. The focus lens -f is appropriately selected according to the
measurement depth. FIGS. 5 and 6 are embodiments showing other shapes of the linear-sector
integrating lens according to the present invention, and FIGS. 5 (a) and 5 (b) are the same as FIG.
4 (a). The lens shape in the case of V2, FIGS. 6A and 6B show the lens shape in the case of k V +>
V 2 as in FIG. 4A. In addition, the lens 20.20. Of the array vibrator 11 and the propagation
medium 3o. The bonding surface with is formed in a flat surface or a curved surface that matches
the surface of the lens.
As described above, according to one aspect of the present invention, the linear / sector
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conversion lens KI [not only when the arrangement direction (y direction or azimuth direction of
the mover) but also when the lens thickness direction (two directions) Since the beam in the
thickness direction is also focused, an ultrasonic image with high resolution can be obtained in
the thickness direction as well as in the azimuth direction, and the effect is large for practical use.
[0002]
Brief description of the drawings
[0003]
Fig. 1 is a diagram showing the main part of a conventional super linear 1 Ia I stylus capable of
linear sector conversion, Fig. 2 and Fig. 3 are diagrams for explaining the shape of the linear
sector conversion lens, and Fig. 4 FIG. 5 is a view showing the shape of a linear sector conversion
lens according to the present invention, and FIGS. 5 and 6 are views showing other embodiments
of the linear sector conversion lens according to the present invention.
10: Linear electronic scanning probe, 11: array transducer, 20.20+: linear sector conversion lens!
Io: propagation medium. オ3I! 1 o 4 nU)
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