JPS6075045A - Ultrasonic diagnostic apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (b) Industrial application fields The present invention relates to an ultrasonic diagnostic apparatus.

(B) Prior Art Conventionally, an ultrasonic diagnostic apparatus is equipped with a transducer having a plurality of transducers arranged in an array, and linearly scans the transducer to transmit ultrasonic waves to a subject. Ultrasonic echoes reflected from various parts within the specimen are received again by the transducer, converted into electrical F-signals, and sampled at a predetermined frequency.

At this time, echo signal sampling is performed three times a month.1) There is a dynamic 7-ocular input method that changes the focus according to the depth of the transducer to each part within the subject. In this method, for example, when the depthwise region within the subject is divided into a near region N, an intermediate region N1, and a far region F, as shown in Fig. 1, each region N, h, l, and F is One frame of tomographic image is formed based on the individual echo signals obtained from the image. By the way, in the conventional method, for example, when sampling echo signal data in the adjacent area N, - after sampling the echo signals from the mandrel areas N, M, and F, only the echo signals from within the adjacent area N are used. , signals from other regions M and F are discarded. In other words, align the 7 orcus from the main sword and 1 tampling the echo signal from the focused point.
1. I sunblink all the echo signals from F and then focus them.

Therefore, to calculate one frame of tomographic image, jυ is essentially:
(It takes time for the frame. Therefore, the frame rate
1. is low and the real-time performance is poor. 4; There is a problem that it is sufficient.

(c) Purpose The present invention solves the above problems, and aims to enable real-time tomographic images with increased frame rate in Dynaminokutsu Orcus 1J format.
, J and 4-ro.

(D) Structure In order to achieve such an object, the present invention includes means for generating a beam scanning control signal for alternately switching and scanning the ultrasonic beams 11 emitted from one transducer at a predetermined distance; means for outputting a 7-occus selection signal for selecting and switching 7 orcuses for every 1-field scan of the ultrasonic beam in response to the beam scanning control signal; and a trigger for exciting each transducer based on the focus selection signal. A means for changing the pulse period of the pulse is provided so that only the echo signal from the focused area is sampled.

(e) Examples Hereinafter, the present invention will be explained in detail based on the examples shown in FIGS. 2 to 6. FIG. 2 is a 70-level diagram showing the entire ultrasonic diagnostic apparatus of this embodiment. In the same figure, 1
2 is an ultrasonic diagnostic device; 2 is a transducer for transmitting and receiving ultra-FF waves; this transducer 2 has a plurality of transducers (not shown) arranged in an array. 4
is a pulse generation control circuit that generates pulses for excitation scanning and ejection of each vibrator of the transducer 2 (3 is a transducer number 2 and 11 based on the output pulses from the pulse generation control circuit 4); 7 Orcus of F-4 and FtJ of Transtuyu blade 2 + Focus and element selection circuit that sequentially selects each vibrator to be shaken, 8 is IU] / Suju → No. 2 7 Orcus and element selection circuit 6 10 is a display circuit that displays an image of the echo signal that has passed through the waveform shaping circuit 8, and this display circuit 1 ()
includes a digital scan converter 'J) and a CRT.

FIG. 3 is a block diagram of the +iii pulse generation control circuit 4. In the figure, 12 is an oscillator that outputs a clock pulse with a fundamental frequency of 51], and 1.1 is 3, which will be described later.
7 orca 2, selected 1 shaku (
i YJ F A first subtraction counter 16, which increases the fundamental frequency of the clock pulses from LD Cf, for example to 1, i128;
) 1', a second subtraction counter 18 which receives the force pulse and subtracts the frequency of the output pulse of the unit by 1/2, in other words, and a third subtraction counter 20 which subtracts the frequency by the same <1/3.
and each of the first to third subtraction counters 16, 18.2
24 is a monostable multivibrator 951 that outputs a trigger pulse T that excites each vibrator of the 1-lanth pump 2 in response to the pulses output from the multiplexer 22. 2G receives the trigger pulse '1' from the first monostable multivib break 24 and converts the ultra-1'1-wave beam emitted from the transducer 2 to a predetermined R.
A counter is a means for outputting a beam scanning control signal U that alternately scans IJ at intervals of 11, and connects the output terminal of this counter 26 and 7 orcus.
(The connection of the circuit 6 to the human input 11ii'' is shown in FIG.
S 13 or 71 is set to be the most significant pin of the arsenic 1' selection circuit 6.

28 is a second monostable multivibrator which outputs a field end signal S based on the final count output corresponding to one field scanning of the hyperfrequency beam among the count outputs of the counter 2G; 30 is a second monostable multivibrator Means for outputting focus selection signals do a and do b for selecting and switching the focus every one field scan of the transducer 2 in response to the field end signal S from the transducer 28; It consists of a decimal counter 3().

Next, the Dynamink 7 orcus in the ultrasonic diagnostic apparatus 1 having the above configuration will be described with reference to the operation of each part and the timing charts +--) in FIG. In this example, in order to store and display the echo signal data in the dental AA・2/Fumberter of the display circuit 10, the scanning direction of the ultrasonic beam by the transducer 2 is set to the x direction as shown in FIG. , the radiation direction of the ultrasound beam is the y direction. Then, the area in the depth direction (y direction) from the transducer 2 to each site within the subject is divided into three areas: a near area N, an intermediate area NfI, and a far area l'. , M.

Ultra-11 wave transmission and reception time within 1.0-] 27
Count), 128-255 Count 11.256-383
correspond to the count. Then, the count 0=383 is made to correspond to the )' address of the dental scan converter. When 7 orcuses are initially aligned with the adjacent region N, the multiplexer 22 of the Noculus generation control circuit 4 is connected to the input terminal X directly connected to the first subtraction counter 16.
. is connected to output terminal Y. Therefore, the clock pulse of the oscillator 12 is output to the Y address counter of the dental scan converter of the display circuit 1 ( ) and also to the first subtraction counter 16 . The first subtraction counter 16 converts this clock scum into 1/128.
This is then added to the first monostable multi-bi flake 2 through the multiplexer 22. The first monostable multivibrator 2.1 outputs a trigger pulse "1" in response to this clock pulse. This trigger pulse is sent to the transducer 2 and the force scanner 2G. The counter 26 counts 1 cass '1' and outputs the beam scanning control signal U. This beam scanning 1 interval signal () is output to the 7 orcas and the element selection circuit 6, so the circuit 6 The vibrator to be excited is selected based on this beam scanning control signal U. In the case of -, the connection between the counter 26 and the 7 orcus and element selection circuit 6 is as shown at 71 in FIG. , the ultrasonic beams emitted by the transducer 2 upon receiving the trigger pulse 'l' are shown in Figure 5, and are numbered 1.2.3,...
('/i';, the switching source is scanned alternately at a constant distance of 1 x 1. Moreover, the pulse period of the trigger pulse] is also outside the range when this proximity area N is taken as a lunar elephant. Therefore, the super r from within the adjacent region N
Only the T-wave echo is delivered at 1 run → t2,
When the ultrasonic wave from a region M, l' reaches J2, the vibration J' that receives the ultra-F1 echo is 1)' point P
゛1 to 1-go-to-go-to-to-C-to a distant area 4
, super-11 echoes from F are ignored. Therefore, scanning by ultrasonic beams eliminates the influence of multiple echoes. Then, the counter 26 becomes 1.
The count output of the last regalia or '1' of the scan is applied to the second monostable multivibrator 28.

The second monostable multivibrator 28 outputs a field end signal S in response to this counter output, and sends this field end signal S to the thrust 1 counter 3 ( ).The ternary counter 30 outputs a field end signal S. When the signal S is input manually, its output terminals A and F3 respond to it.
The 7-occasion selection signals %Fa and Fb are output from. This focus selection signal Fat de 1] 1 Sat multiplex → t2
2 and 7 and are sent to the element selection circuit 6, respectively. When the focus selection signal F a , Fl) is manually input to the multiplexer 22, the connection of its input/output terminal is switched, and the second: calculation, counter 10 (two directly connected input terminals fX1 and 1!1 input terminal) ′. At the same time, the focus and element selection circuit 6 manually selects 7 orcuses based on No. 1-7 (I'a, Fb) into the intermediate region Mj. As shown in FIG. 2, an orcus is set for each area j (for each N, M, l:'), and one field's worth of ultrasonic beam scanning is performed. The further the field gets, the longer the period of the trigger pulse 'I' becomes. However, in any of the areas N, M, and F, the ultrasonic beams 1 and 1 are alternately scanned at a predetermined distance xi. Then, each echo signal obtained by the transducer 2 by setting the 7 orcuses is received and focused in the 7 orcus and element selection circuit 6 corresponding to each region N, M, F, and then sent to the waveform shaping circuit 8. The signal is waveform-shaped and sent to the display circuit 10.

(f) Effects As described above, according to the present invention, seven orcuses are matched according to the depth from the transducer to each part within the subject, and the echo signal from the matched place of the seven orcuses is sampled. After sampling all the echo signals such as , the tomographic image] frame formation time is shorter than that of combining 7 orifices, and therefore the 7 frame rate can be increased. For this reason, a tomographic image with a high degree of real-time performance is obtained, and an excellent effect is exhibited in that diagnosis can be performed more accurately.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the areas in the depth direction within the subject divided into sections, FIGS. 2 to 6 show embodiments of the present invention, and FIG. 2 is a block diagram showing the entire ultrasonic diagnostic apparatus. Figure 3 is a block diagram of the pulse generation control circuit, Figure p/J4 is a wiring diagram showing the connection relationship between the counter, focus and element selection circuit, and Figure 5 is an explanatory diagram of Dynamic 7 Orcus.
FIG. 6 is a time chart of the signals output from the nockle generation control circuit. 1 is an ultrasonic diagnostic device, 2 is a transformer, 4 is a pulse generation control circuit, 14 is a long period changing means, 16
is the first subtraction counter, 1) 3 is the second subtraction counter, 20
is the third subtraction counter, 22 is the multiplexer, 26 is the counter, and 3 () is the ternary counter.Applicant: Shimadzu Corporation Representative Patent Attorney Kazuhide Oka 1)

Claims (1)

[Claims] (1) Equipped with a transducer having a plurality of transducers arranged in an array, the in t
In a dynamic 7-orcus type ultrasonic diagnostic apparatus in which the focus of the L-wave echo is changed according to the depth from the transuser to each region within the subject, the focus of the L-wave echo is changed from the transuser to each region within the subject. A step 1J generates a beam scanning control signal for switching and scanning the ultrasonic beam 1-1 at a predetermined distance 24'1-, and in response to the beam scanning control signal 11; 1,000 frequency pulses that output seven focus selection signals for selecting and switching the focus every one field scan of the wave beam, and changing the pulse period of the trigger pulse that excites each of the vibrators based on the focus selection signal one by one. 1. An ultrasonic diagnostic apparatus characterized by being provided with means for: