JPS5943353A - Ultrasonic pictualization apparatus - Google Patents

Abstract

PURPOSE:To evaluate deficiency appropriately even when the opening requirement is not satisfied fully, by standardizing a mutual correlation value seeking mutual correlation between a ultrasonic receiving signal and a reference ultrasonic receiving signal. CONSTITUTION:An ultrasonic echo signal obtained by scanning over a object 3 to be inspected with a probe 1 is memorized sequentially into a full wave type memory 7 through an A/D converter 4 and a buffer memory 5. The contents of the memory 7 and a reference echo waveform data from a reference echo converter 9 are applied separately to a mutual correlation computing circuit 11 and a self-correlation computing circuit 12 to determine a mutual correlation value, which then is standardized with a standardization circuit 13. The mutual correlation value thus standardized is stored into video RAM11 as luminance modulating signal and then, applied to a CRT display 20. This enables appropriate evaluation of deficiency even when the opening requirement is not satified fully.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic imaging device that displays a cross-sectional image of a subject, and is particularly suitable for detecting defects existing in a material such as 1-1 deep by ultrasonic waves. The present invention relates to an ultrasound imaging device.

Conventionally, defects existing within a subject have been detected by transmitting and receiving ultrasonic waves to and from the subject. An ultrasonic imaging method using the 1H mouth synthesis method is known. In the aperture synthesis method, a probe with wide directional characteristics transmits and receives ultrasonic waves to and from the subject at multiple points, and each ultrasonic reception signal is added and accumulated on the playback screen centered around the ultrasound transmission and reception point. Images are formed by doing this. In this method, if ultrasonic transmitting and receiving points can be secured over a sufficiently wide area, it is possible to display defects with excellent resolution. However, in actual detection, the ultrasonic transmitting and receiving points are limited by the shape of the object and the condition of the object.
Satisfy the opening condition (111-1), J synthesis method, defective evaluation 1111 juice IE ability fully demonstrated [2-4
)fx y), tri'21 cases are common.

Utsu-ko'I')'r Gate's purpose O; 1, 10:5) fJ
: Open 11:00 1'1: is not satisfied iL 1 ha - also defective iit''l1ill juice ability enough light (・1 eye /
Obtain r service γ cost skin reflection + ii: It is to provide 'Hke to disguise.

This [j's present invention &, J2, insufficient J's [I old-
j condition %7) Also super if wave Jpe father ftA point each h'', p
Obtained ultrasonic wave
．． Based on the change in Y111 and the change in vibration Φ(,), the presence of a defect is estimated to be 1-position and 710%"\[J l
~, j'-11 (tf wave transmission/reception signal point fJh up 1i7 et al. In order to standardize the cross-correlation calculation in addition to the calculation block ζ, the small defects are displayed as ゛(・i height).

Hereinafter, the present invention will be explained with reference to Figure 3134 from .;rr].

First of all, in Figure 1 V, there is a general first command and indication of the design by + u and 1. J, and il
i', l moe once h! (58 - C search f'1"j (complete - 1 stroke (Subject 3 Table 1f - 1 arrow direction turn (-
7, while the probe 11 on the surface of the object 3 -[-
''/: It'i-k so that it is detected by the 1-speed detector 6. Probe 1 is at a predetermined position fi'j:
K reaches the river 1N11 ml1 The circuit 8 drives the ultrasonic probe 2 i/i:, j: tsu- (Ultrasonic waves are emitted from the probe 1 toward the inside of the subject 3. This transmitted ultrasonic wave is reflected from defects such as inside the object 3 and is received by the probe 1 as an ultrasonic echo in the form of an air signal. , are subjected to A/D conversion via the ultrasonic probe 2, subjected to 1v' mixing at a fixed cycle by the A/D modulator/demultiplexer 4, and then A/D converted.A/1) Converted ultrasonic echo is buffer memory 5
, are stored as waveform data in the total waveform memory 7 in the order of predetermined addresses via the surface control bus 16, but a series of A/1. ) When storing the converted data in the entire waveform memory 7, if the waveform data within a predetermined scanning range is
This is stored in a predetermined manner in the entire waveform memory 7 as a digital value.

The waveform data stored in the total waveform memory 7 in this way is subjected to correlation processing with the standard echo waveform data of the standard echo pattern generator 9. The standard echo waveform data will be explained below.

In other words, if we focus on a certain point inside the object, and if there are no defects at that point, then the time it takes for the ultrasound reflected by the defect to be received (FN) by the probe is
Since this depends on the distance 1-11 between the ultrasonic transmission point and the point of interest, it becomes possible to easily generate a standard echo waveform sequence.

Fig. 2 r, j When it is assumed that a defect exists at the point (xO + YO) inside the destructible body 3, the point (x,
0) (jII) This shows how to obtain the Hihiru skin echo number at the line 1 with 1. As shown in the figure, probe 1 is directly at point (xo + Yo). If it is at the top, 1+;l, the least time delay shi"t, l, maybe the amplitude person 11i (F-fu uu echo-1= is obtained, the probe f1 is ihL t,"+: The further away you are from Xn +0), the more time lags V('7, and the further you move, the more you move 1P7.'
J mouth super toy? It turns out that a skin echo can be obtained. The deviation from the transmitted ultrasonic waveform h (t) is the difference between the probe 1
The ultrasonic echoes (A No. 5(1)) received by the ultrasonic echoes (A 5(1)) are shown as 1:1, which is more than 4 times t in time.

5(t)=h (t-zt/v) −...
...(]) However, t is the distance (=V
'τ-x:) -'4' Yg ), and ■ indicates # luck within the subject 3.

By the way, when determining the standard echo waveform data, it is assumed that the sensitivity is determined by the width V and the directivity angle of a probe with a wide directivity, and the amplitude information a (
x;

r(Xs' :xOr yo)"'a(x;Xo I
yo) ”h (t-2/-/v) +++-+
+.-(2) This allows standard echo waveform data for the pressure point within the patient's body to be obtained for the neglected ultrasound transmission point. The standard echo pattern generator 9 outputs the standard echo waveform data corresponding to the updateable points (XO, Yo) according to x, xo, t, y, -r as a digital 1 direct signal. Whether the standard echo waveform data is 1° or less is x, xo, t, and y from the correlation control circuit 10. I am by. On the other hand, it is super [
A pair of tube skin eco nails, ('7' skin shape data S (x, t)
Expressed as Q), then X and 1 are one at l
By loading the data as /, the 11th waveform data is read out from the entire waveform memory 7. The standard i%/j echo waveform 5' data and the waveform data from the total waveform memory 7 are processed by the cross-correlation calculation circuit 11, which is completed as follows.

[Ko J + shi, correlation processing is f111 ministry 11 circuit 8 is Yamama frill sub-circle 11'i'iJ, 0' (+r rise! 1
Started by 11IJL. When the 4 old v.1 bactericidal circuit 10 is activated, it performs f-ming control on all predetermined functions such as the correlation operation system f1111 node 17 and the mutual correlation operation n circuit 11, while all the waveform memory 7 and standard (((Echo pattern generator 9 pieces 1llll l) waveform data s(x, t) and standard echo waveform data r(Xn'
i First, the correlator r+Ti1 circuit 10 selects the first point of interest (XO+yO) and then inputs it to the standard echo pattern generator 9. Thereafter, the standard echo waveform generator 9 and the total waveform memory 7 are updated with X and tk and given two times. As a result, the cross-correlation calculation circuit 11 calculates the cross-correlation value "(XO+3'o)" for the point (xo*yo) according to the following formula.

Ix (Xor Yo)-Σr(Xn': X
fly yo )・s(x, 1) ・・・・・・
(3) At the same time, the autocorrelation calculation circuit 12 begins to calculate the autocorrelation value IX (XOl yO) for the LL standard echo waveform data as follows. ing.

II (XO+yo)−Σr2(X, t;
The cross-correlation value lx & obtained according to equation (3) is further normalized by the auto-correlation value ■1 in the normalization circuit 13.

IN (XO, yo) -Ix/ It ・Old・・・・・・・・・・・・(5) This normalized correlation II I
N (XO, Vo) is a point (xo.

Yo ) Correlation Ri! as corresponding brightness modulation data! I
! The data is stored in the video RAM 1.4 by the H111 circuit 10. Point (Xo,
yo) If you perform -1-it14 ablation every time you add IJi, the brightness I at all -C points in the subject will be
This means that the key data is stored in the video RAM 14 in the predetermined order.
11 mountain rMI' by 1illll Ltll b pickle 8
F to video 17, A, i) From I 1.4, read out current modulation data in fixed address order and CI
tI' Display 20 indicates that test subject 1 is on display.
This is where the cross-sectional area of 1. is displayed.

j! Although the i-ordinary cross-correlation value Ix is not necessarily standardized,
The super t'Iθ transfer point is limited, and the state of normalization is ξ, and the town is 1 good and lacking 1! f+'+unit-i
It is iiJ's ability to f'F il1 row. (C14
For example, as shown in Figure 3, soil bead 13 is 48FS1~.
The probe has been finished and there is one probe on the lead 13.
Is this from Chonanami Echone Old Heart? The skin shape data is h'', -
7, fq et'+, -, s-, <partially missing'+'h L
, - becomes something. This person's η, if the case is 21 synthesis method, 11) the strength of one raw meat image will be (some t), and if defect evaluation is done properly, the strength will be reduced to 11, but if le 1 (sonic wave transmission f
If the range in which the 4i points are restricted is 1'-11, then defect evaluation can be appropriately performed using the normalized correlation value.

Here, the range in which the ultrasonic transmission point is limited for bead B, t, is the center of bead B.
If Ka (a ; > 0 ), then 1111 enclosure of X'
The normalized correlation value IN (determined as 5 or less) is e l x l a.

・・・・・・・・・・・・・・・(6) Setting the range of Appropriate defect evaluation can be performed by determining and standardizing the

As explained above, in the case of the present invention, the cross section of the object is displayed through correlation processing. Since the correlation processing result is normalized when the 1/2 ratio is satisfied, there is an effect that defect evaluation can be performed appropriately even when sufficient aperture conditions are not satisfied.

[Brief explanation of drawings]

Figure 1 shows the configuration of the device according to the present invention. FIG. 3 is a diagram illustrating the processing when the ultrasonic transmission point is reduced. ■...Probe, 2...Ultrasonic detector, 4...A
l1) Converter, 5... Buffer memory, 7... Full waveform memory, 8... Control 1ti1 circuit, 9... Ritsu W i^
Echo pattern generator, 10...correlation side (goods) circuit,
11...Cross correlation calculation circuit, 12...Autocorrelation calculation circuit, 13...Kari, foil circuit, 14...Video)
(, AM, 15...C[1'r' indicator. Agent: Patent attorney Masami Akimoto, 3 (¥1

Claims (1)

[Claims] 1. Ultrasonic echoes from the subject in response to the transmitted ultra-high waves are converted into air signals and processed, and based on the processing results, the ultrasound imaging device displays the entire image inside the subject. The ultrasonic echoes added sequentially as the scan is performed are converted to A/I) and described in 1. The ultrasonic echocardiogram from all 71 points inside the object obtained at the rFii sound wave transmitting point is stored in the entire waveform memory, and i is generated in the standard rectangle 111ti. ``Quasi-echo pattern generator, the generator and -J 1': Cross-correlation operation to cross-correlate the data of all waveform memories tj't, H>! An autocorrelation calculation circuit that performs autocorrelation calculation based on data, and a cross-correlation (
``Equipped with a normalization circuit that normalizes the cross-correlation value from the X-calculation circuit; Imaging device.