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JPH04300530

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH04300530
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
ultrasonic diagnostic apparatus.
[0002]
2. Description of the Related Art In an ultrasonic diagnostic apparatus, as shown in FIG. 4, an
ultrasonic probe 2 and a preamplifier provided corresponding to each micro-oscillator in the
ultrasonic probe 2 4, an adder circuit 10 having a pulser 6 and a delay 8 and performing
necessary signal processing such as filter compression or detection in an adder circuit 10 for
adding each delay 8 output and a processing circuit 12 based on the adder circuit 10 output
Then, there is one which is output to the digital scan converter 14 to project a tomographic
image of ultrasonic waves on a CRT screen (not shown).
[0003]
In the ultrasonic probe 2 and the pulsar 6 provided in such an ultrasonic diagnostic apparatus,
with respect to the ultrasonic probe 2, a plurality of minute vibrations in which the ultrasonic
probe 2 is continuously arranged in a predetermined direction A predetermined number of
micro-oscillators are used as a transducer block, and the transducer block is shifted for each
predetermined number of micro-oscillators in the direction, and the drive pulse from the pulsar 6
is used in each transducer block. The micro-oscillators are driven substantially simultaneously to
emit ultrasonic waves, and for the pulser 6, a drive pulse is applied to the micro-oscillators
according to the arrangement position in the block to drive the micro-oscillators. There is.
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[0004]
A drive pulse application method for each micro-oscillator in such an oscillator block will be
described with reference to FIGS. 5 and 6. FIG.
[0005]
In FIG. 5, assuming that each micro-oscillator in the oscillator block is, for example, nine A1 to A9
for simplification of explanation, drive pulses P1 to P9 are applied to each of the microoscillators A1 to A9. The pulsers 6 to be applied are nine PC1 to PC9.
[0006]
The drive pulses P1 to P9 in FIG. 6 (a) as the first application method are all single polarity
individually for each of the micro-oscillators A1 to A9, and the drive voltage is one wave train
number. The level is the same drive pulse.
As the second application method, the drive pulses P1 to P9 in (b) are all single polarity and the
number of wave trains is one wave, but different from (a), the drive voltage level is on the end
side in the vibrator block The drive pulse gradually increases in a stepwise manner from the
center to the center side.
As a third application method, the drive pulse of (c) has a single wave type with a combination of
one wave series and two wave series, and all drive voltages have the same drive voltage level.
[0007]
In the first application method shown in FIG. 6 (a), drive voltages are applied to all of the microoscillators A1 to A9 in the oscillator block regardless of their arrangement positions. In order to
apply the drive pulse of the same level, the emitted ultrasound has side lobes on both sides of the
main lobe.
And, since the ultrasound of the main lobe is much larger than that of the side lobe, by adjusting
the sensitivity to the reception level of only the reflected ultrasound of the main lobe, the
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reflected ultrasound of the side lobe is an ultrasound The tomographic image for diagnosis is not
projected on the CRT screen, but as sensitivity is increased, the reflected ultrasound of the side
lobe is also received. As a result, the tomographic image of the affected area by the reflected
ultrasound of the main lobe on the CRT screen In addition to this, the first application method
has a disadvantage that a virtual image due to a side lobe unrelated to the tomogram of the
affected area is also displayed on the CRT screen.
[0008]
In the second application method of FIG. 6 (b), the micro-oscillator A5 on the center side from the
micro-oscillators A1 and A9 on the end side according to the arrangement position of the microoscillators in the oscillator block. By increasing the drive voltage level of the drive pulse toward
the side, the sensitivity can be greatly increased by suppressing the side lobes, so that only the
tomographic image of the affected area is displayed on the CRT screen. can do.
[0009]
However, in the second application method, since the high voltage is switched in a short time to
increase the voltage level of the drive pulse, there is a problem that the power consumption
increases.
[0010]
In the third application method of FIG. 6C, although the disadvantages of the first and second
drive pulse application methods can be substantially eliminated, the number of wave trains can
be about 3 at most, If the number of continuous waves is about three, if the number of microoscillators in the transducer block becomes several tens, there is a problem that the distance
resolution for performing ultrasonic diagnosis of the affected area from the tomogram becomes
insufficient .
[0011]
An object of the present invention is to provide a drive pulse application method capable of
sufficiently increasing the sensitivity of a tomogram while suppressing power consumption and
further having an excellent distance resolution.
[0012]
SUMMARY OF THE INVENTION In order to achieve the above object, in the ultrasonic diagnostic
apparatus according to claim 1 of the present invention, an ultrasonic probe and a pulsar are
provided. The acoustic wave probe comprises a plurality of micro-oscillators continuously
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arranged in a predetermined direction, and a predetermined number of micro-oscillators as a
transducer block, and the transducer block for each predetermined number of micro-oscillators
in the direction The micro-oscillators in each of the oscillator blocks are substantially
simultaneously driven by the drive pulse while shifting the pulse width, and the pulser has the
same driving voltage level for each of the micro-oscillators in the oscillator block. A drive pulse is
output, and the number of wave trains to the drive pulse (the number of drive pulses applied in
the same cycle as the simultaneous drive) according to the arrangement position of the microoscillators in the oscillator block Pulse width and Is characterized by a combination is intended to
vary.
[0013]
In the ultrasonic diagnostic apparatus according to a second aspect of the present invention, the
pulsar outputs drive pulses having the same drive voltage level to each of the micro-oscillators in
the oscillator block. The frequency of the drive pulse is varied according to the arrangement
position of the micro-oscillators in the oscillator block.
[0014]
In the ultrasonic diagnostic apparatus according to a third aspect of the present invention, the
pulsar outputs drive pulses having the same drive voltage level to each of the micro-oscillators in
the transducer block. According to the arrangement position of the micro-oscillators in the
oscillator block, the combination of the number of wave trains for the drive pulse, the pulse
width and the frequency is varied.
[0015]
In each claim, in the ultrasonic probe consisting of a plurality of micro-oscillators continuously
arranged in a predetermined direction, a predetermined number of micro-oscillators are used as
a transducer block, and the micro-vibrations in the direction are performed. When the microoscillators in each transducer block are substantially simultaneously driven by the drive pulse
while shifting the transducer block for each predetermined number of the transducers, the drive
pulse from the pulsar is set to each According to claim 1, the combination of the number of wave
trains for the drive pulse and the pulse width is varied according to the arrangement position of
the micro-oscillators in the oscillator block while outputting to each of the oscillators. In this
case, the frequency is varied, and in claim 3, they are varied by their combination.
[0016]
Therefore, even if the number of wave trains is three for the micro vibrator at the center side, the
pulse width of the drive pulse from the micro vibrator on the end side toward that at the center,
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the demagnetization switch, the wave train, etc. By adjusting the number or the like, the influence
of the ultrasound side lobe can be easily reduced.
[0017]
Embodiments of the present invention will now be described in detail with reference to the
drawings.
[0018]
The ultrasonic diagnostic apparatus of the present embodiment is basically configured as shown
in FIG. 4, and the ultrasonic probe is driven by driving pulses as in FIG.
That is, as in the prior art, the ultrasonic probe is composed of a plurality of micro-oscillators
continuously arranged in a predetermined direction, and as shown in FIG. With the transducers
A1 to A9 as one transducer block, the micro-vibrator in each transducer block is substantially
driven by the drive pulse while shifting the transducer block for each predetermined number of
micro transducers, for example, one in the direction. Simultaneously driven.
[0019]
The present embodiment is characterized by the configuration of the pulser.
That is, the pulsars are provided corresponding to the number of micro-oscillators, and all are
configured as shown in FIG.
That is, as shown in FIG. 1, each of the pulsers PC1 to PC9 in FIG. 5 has a wave reciprocation
number setting circuit S1, a pulse width setting circuit S2, and a drive pulse output circuit S3.
The wave train number setting circuit S1 sets the number of wave stations, the pulse width
setting circuit S2 sets the pulse width of the drive pulse, and the drive pulse output circuit S3
outputs the drive pulse. .
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Although these are shown as hardware in the embodiment, they can be configured by software
with a microcomputer.
[0020]
First, in each of the pulsers PC1 to PC9, the number of wave stations is set to 1 in the wave train
number setting circuit S1 of the pulsers PC1 and PC9, and the pulse width is W1 in the pulse
width setting circuit S2. And is set.
Likewise, the pulsers PC2 and PC8 are set to have a wave train number of 1 and the pulse width
of the drive pulse is W2 (> W1), and the pulsers PC3 and PC7 have a wave train number of 2 and
a pulse width of each drive pulse W1, pulsers PC4 and PC6 are set to 2 wave trains, pulse width
of drive pulse is W2, balsa PC5 is set to 3 wave trains, and pulse width of each drive pulse is set
to W1.
[0021]
By such setting, the unipolar drive pulses P1 to P9 of FIG. 2 are applied from the respective
pulsers PC1 to PC9 to the respective micro vibrators A1 to A9 in the vibrator block. As a result,
since the pulse width of the applied drive pulse having the same level as the total increases from
the micro-oscillators on the end side such as A1 and A9 toward the micro-oscillators on the
central side of A5, as shown in FIG. Similar to the second application method of b), the side lobes
of the ultrasonic wave are suppressed, and as in the first application method of FIG. 5 (a), a large
amount of power is not consumed. Unlike the problem that the distance resolution decreases as
the number of micro-oscillators increases because the number of wave stations is at most 3 as in
the third application method of (c), Maximum number of stations Becomes what can increase the
distance resolution even if the number increases of micro-vibrator by varying the pulse width of
the drive pulses in three.
[0022]
In FIG. 2, although the drive pulse has a single polarity, the frequency (T1 in terms of period) of
the drive pulse for the micro-oscillator A5 on the center side as shown in FIG. The frequency is
made higher for the micro-oscillator on the end side than the central micro-oscillator in
accordance with the natural vibration frequency of A5, that is, the periods are successively
shortened, that is, T1> T2> T3> T4> T5 The relationship may be substantially the same as that of
FIG. 2 by controlling the relationship, or may be a combination thereof.
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[0023]
As is apparent from the above description, according to the present invention, a predetermined
number of micro-oscillators in an ultrasonic probe are used as a transducer block, and the microoscillators are arranged in the above direction. When the micro-oscillators in each oscillator
block are substantially simultaneously driven by the drive pulse while shifting the oscillator block
for each predetermined number, the drive pulses from the pulsar are used as the microoscillators in the oscillator block. According to the first aspect of the present invention, the
combination of the number of wave trains for the drive pulse and the pulse width is varied
according to the arrangement position of the micro-oscillators in the oscillator block. In the third
aspect of the present invention, the wave reciprocation number is three for the micro-oscillator
on the center side, and the micro-oscillators on the end side to the one on the center side
Direction According to the pulse width of the drive pulse, the frequency, the number of wave
trains, etc., the influence of the side lobes of the ultrasonic wave can be reduced easily, and as a
result, the sensitivity of the tomographic image is sufficiently increased while suppressing the
power consumption. It is possible to provide a drive pulse application method which is excellent
in distance resolution.
[0024]
Brief description of the drawings
[0025]
1 is a block diagram of the main part of an ultrasonic diagnostic apparatus according to an
embodiment of the present invention.
[0026]
2 is a waveform diagram showing an example of a drive pulse used to explain the operation of
FIG.
[0027]
3 is a waveform diagram showing another example of the drive pulse used to explain the
operation of FIG.
[0028]
4 is a block diagram showing a schematic configuration of the ultrasonic diagnostic apparatus.
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[0029]
5 is a diagram showing the relationship between the ultrasonic probe and the pulsar of the
ultrasonic diagnostic apparatus.
[0030]
6 is a waveform diagram of a drive pulse according to the conventional method.
[0031]
Explanation of sign
[0032]
2 Ultrasonic probe 6 Pulsars A1 to A9 Micro-oscillators PC to PC9 in a transducer block Pulsers
P1 to P9 in a transducer block Driving pulses
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