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JPS54128326

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DESCRIPTION JPS54128326
Description 1, title of the invention
Ultrasound probe
3. Detailed Description of the Invention The present invention relates to an ultrasonic probe
having a wide ultrasonic beam width to improve the azimuthal resolution. As is well known, the
azimuthal resolution of an ultrasonic tomography apparatus used for medical diagnosis and the
like is determined by a probe that emits and receives an ultrasonic beam. That is, as shown in
FIG. 941, in a probe using a disc-like transducer (1a) conventionally used as a probe of a
mechanical scanning ultrasonic tomography apparatus, the diameter of the disc is Assuming that
the wavelength of the ultrasonic wave is taken), the width of the ultrasonic beam is about the
same as the diameter of the transducer (1a) up to the near field limit (Xn) determined by Dh The
ultrasonic beam spreads at the opening angle of / 1). Conventionally, as a means for reducing the
width of the ultrasonic beam and increasing the azimuthal resolution, as shown in FIG. 2, the
transducer (1b) is concavely heated, or as shown in FIG. A method is employed in which a
concave acoustic lens (2) is attached to a plate-like vibrator 0 ′ ′. In the case of using a probe
which performs these concave portions, the pressure is strongly pressed to improve the contact
with the living body so that the gap between the concave portion and the subject is lost, or Filler
(3a) of ultrasonic medium as shown in FIG. It is necessary to fill (3b) into the concave space and
make it flat. However, in the case of the former, the probe is strong (pushing the load on the
subject and calibration person increases the load, and in the case of filling the filler (3a) or (3b),
the filler There is a disadvantage that the refraction of the acoustic wave occurs at the interface
between the light source and the living body (4), and the focal point of the beam changes
depending on the type of filler used. That is, in the case of FIG. 2, the focusing point of the beam
is, for example, a concave EndPage: 1 pressure (where the curvature radius of the element
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oscillator (1b) is (6), the focusing point is to)) Due to the inclusion of the filler (3a), the effective
radius of curvature changes to (Re). Further, also in the case of using the acoustic lens of FIG. 3,
when the radius of curvature of the acoustic lens (2) is (R '), the effective radius of curvature
changes to (Re') in the presence of the filler (3b). That is, the defect that the beam focusing point
changes is inevitable. In view of the above, according to the present invention, the ultrasonic
radiation surface of the ultrasonic probe is flat and the ultrasonic beam is focused as in the case
of using the concave vibrator or the concave tV lens described above. It is an object of the
present invention to provide an ultrasound probe that can be used and that the displacement
does not occur because the filler is not used. Hereinafter, the configuration of the non-invention
will be described in detail based on the examples shown in FIG. 4 and FIG.
A single circular oscillator (10 m) of an ultrasound probe consisting of IG, an annular ring (11 m)
(ll b) (II c)-(ll k ) = · (Lln) is a discoid body (1 sheet is formed from the center of the oscillator uti,
and this discoid body [12] is also made of an adhesive or the like using the adhesive etc. Stuck to
the That is, each sound velocity of the annular ring concentrically accumulated in the order of 1
", 21... K", ...-is v1 ++ v2 "" 5+ ", Vn, and the sound velocity of the radiation medium (living body)
is vo , Disk-like body (If the width of 12 is t, the propagation of the sound wave in the radiation
medium of the sound wave that has passed through 4 rings (IIR) one hour after the ultrasonic
wave is emitted from the circular oscillator a The distance tk is tk = Vot-L '... Assuming that the
sound waves passing through each ring form an in-phase wave front with a curvature (Rocurvature radius) of 1 / R0 after 1 hour, the propagation distance of the sound wave that has
passed through 1 and 11 rings Assuming that the difference is Δtlk, ... [2] where a = radius of
the oscillator, and on the other hand [1] formula% formula%-and the width t of the ring, thickness
and 17th By determining the sound velocity of the ring (the velocity of sound of the arbitrary
layer, the sound velocity of the ring of the arbitrary layer is determined, and the radiation
emitted from the ultrasonic probe provided with the discoid @ determined as described above is
The sound wave is electronically focused by the discoid body (2) to perform the velocity
collection in the direction perpendicular to the scanning plane (x-y plane) at a distance Ro from
the torus surface and to give a time difference of excitation of the circular vibrator Therefore, by
making the speed on the scanning surface, a thin beam is formed, and the discoid body can be
made thinner than conventional concave acoustic lens Further improve the radiation efficiency of
the acoustic waves from the exhibit the effect of facilitating the contact with the living body.
4. Brief description of the drawings FIGS. 1 to 3 show a conventional example of a single
transducer and a schematic view of an ultrasonic beam thereof, FIG. 1 shows a flat plate circular
transducer, and FIG. 2 shows a concave transducer Fig. 3 shows the case of using a back lens as a
flat plate circular vibrator, Fig. 4 is a front view showing an example of the present invention, and
Fig. 5 is a schematic view of its longitudinal cross section and an ultrasonic beam. . Screaming ...
circular vibrator, (lla) (llb) ... annular ring, (2) ... discoid body. Patent applicant Hitachi Medical
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Ltd. Co-agent 鎌 1) Yoshiyuki EndPage: 2 Fig. 1 Fig. 3 Fig. 2 Fig. 5] Art 4 Fig. 5 End Page: 3
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