JP3236672B2 - Ultrasound diagnostic equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises an ultrasonic probe comprising a number of ultrasonic transducers arranged in a predetermined direction, and transmits and receives ultrasonic waves by using the ultrasonic probe, and More particularly, the present invention relates to an ultrasonic diagnostic apparatus that obtains a high-resolution image by devising a delay of each received signal.

[0002]

2. Description of the Related Art Ultrasound is transmitted to a subject, especially a human body.
By receiving the ultrasonic waves reflected by the tissue in the human body and returning with an ultrasonic probe composed of a number of ultrasonic transducers, obtaining a received signal, and displaying an image of the human body based on the received signal. Ultrasound diagnostic apparatuses that facilitate diagnosis of diseases such as internal organs in the human body have been conventionally used.

FIG. 5 is a block diagram showing a configuration example of a conventional ultrasonic diagnostic apparatus. First, the control unit 8 reads out the transmission delay control data from the transmission delay amount storage unit 4 and sets the transmission delay control data in each channel of the transmission delay unit 3. Next, the control means 8 sends a transmission start signal to the transmission delay means 3. The transmission delay means 3 receives this transmission start signal,
A transmission pulse is generated at a timing based on transmission delay control data set in advance. The transmission pulse is converted into a high-voltage pulse by the transmission driver 2, and each vibrator 1 is driven by the high-voltage pulse.

FIG. 6 is a schematic diagram showing the relationship between the arranged ultrasonic transducers and the focal position in the subject. The ultrasound transmitted from each transducer 1 shown in FIG. 5 forms a scanning line perpendicular to the arrangement direction of the transducers, for example, in the case of a linear scanning type, as shown in FIG. Here, when transmitting an ultrasonic wave to the inside of the subject so as to form a focal point at the focal point A shown in this figure, the timing of the transmission pulse corresponding to the point R (vibrator 1_1) and the point S (vibrator 1_128) In consideration of the above, the path difference between the route OA and the route RA (SA) is

[0005]

(Equation 1)

Therefore, if the delay time given by the transmission delay means 3 corresponding to the vibrator near the point O is D, and the sound speed is V, it is given by the transmission delay means 3 corresponding to the points R and S. The delay time K is

[0007]

(Equation 2)

[0008] Similarly, other oscillators may be delayed by the time given by the above equation from the distance H from the point O to the oscillator. The same applies to the focal points B and C.
FIG. 7 is a schematic diagram illustrating a relationship between the vibrator 1 and the delay time. When transmitting ultrasonic waves so as to focus on the focal points A, B, and C shown in FIG. 6, each transducer 1 delays by the delay time along each curve of the focal points A, B, and C shown in FIG. Then, an ultrasonic wave is transmitted.

Returning to FIG. 5, the description will be continued. The ultrasonic waves that have been reflected back at the tissue boundary surface inside the subject and the like are again received by the ultrasonic transducer 1 and converted into electric signals. The reception signal converted into an electric signal is amplified at a predetermined magnification by the preamplifier 5 and input to the reception delay adding means 9. The reception delay adding means 9 is a means for delaying each reception signal input from each input channel by each predetermined delay time, adding reception signals of all channels, and thereby obtaining a scanning signal. FIG.
In the example, the reception delay means 10 corresponding to each channel is provided. The control means 8 reads out the reception delay control data stored in the reception delay amount storage means 7 and stores the reception delay control data in each reception delay means 10. Is set. The reception delay means 10 delays a received signal input for a time based on the given reception delay control data. As a typical example, an electromagnetic delay line having a plurality of input / output taps is used. There are known ones in which a delay time is varied by selectively connecting input / output taps with a switch used, or one in which a digital signal is converted by an A / D converter and delayed using a shift register or a memory such as an SRAM or a DRAM. I have.

Here, as in the case of the transmission, the delay time given to each channel is H, where the distance from the scanning center to each transducer 1 is H and the focal length is k.

[0011]

(Equation 3)

## EQU1 ## By the way, when the focus of reception is set to only one point which is the same as that of transmission, the resolution is good only in the vicinity of the focus, and the ultrasonic waves spread in other areas, and the resolution is poor. Therefore, in order to obtain a uniform resolution regardless of the depth, a so-called dynamic focus method is used, in which the focal point set for reception is sequentially switched to the far depth according to the arrival depth of the ultrasonic wave, that is, the elapsed time after transmission. Can be For example, the focal points A, B, and C shown in FIG. 6 are set at intervals of a distance d, and after the ultrasonic wave reflected by the focal point A reaches the point O, the setting is switched to the focal point B after 2d / V time. Further, after 2d / V time, the focal point is moved so that the setting is switched to the focal point C.

[0013] The respective reception signals time-adjusted according to the arrival time in this manner are all added by the adding means 11, and the obtained scanning signal is sent to the display means (not shown), and the superposed signal inside the subject is transmitted. The tomographic image by the sound wave is displayed.

[0014]

With the recent spread of ultrasonic diagnostic equipment, the demand for higher resolution has been increasing.
To realize this high resolution, it is necessary to increase the diameter by increasing the number of vibrators 1. Consider a case in which dynamic focusing is performed in the above conventional example to further improve resolution. In general, in order to improve the resolution in the focal region, the diameter is increased, that is, the number of elements is increased. In this case, the reception wave received at the scanning center point O (see FIG. 6) and the end points R, The path difference of the reception wave received by S becomes large. Therefore, it is necessary to increase the delay time D of the received signal obtained by the vibrator near the center in the case shown in FIG. When the aperture is set to be large, the resolution at the focal point is further improved. However, the spread of the ultrasonic wave at the position deviated from the focus becomes larger than that at the small aperture, and the resolution is reduced. For this reason, it is necessary to reduce the distance d between the focal points (see FIG. 6) and increase the number of focal points set by the dynamic focus.

As a result of increasing the delay time D and reducing the distance d between the focal points as described above, when D> 2 d / V, a problem occurs if the conventional dynamic focus method is used. . Hereinafter, a case where D> 2d / V is satisfied will be considered. For example, focus A shown in FIG.
Is received at point O, the reflected wave going to point R is at point P. The signal received at point 0 is delayed by a delay time D (see FIG. 7), and should be finally added at the same time as the signal received by all transducers 1 of the reflected wave from focal point A. , D> 2 d / V, the focus A
Before the reflected waves from are received by the vibrators 1_1 and 1_128 at the end, the delay time of each reception signal in the reception delay unit 10 (see FIG. 5) is the delay time corresponding to the focal point B (see FIG. 7). To the end, for example, point R,
The signals of the reflected waves from the focal point A received by the transducers 1_1 and 1_128 arranged at S are delayed by a delay time corresponding to the focal point B, and therefore, the correct focal point is not formed, and the resolution is reduced. Instead of improving it, it causes it to worsen. Therefore, the conventional method has a limitation of D <2d / V, and there is also a limitation in improving the resolution.

The present invention has been made in view of the above-mentioned problems in the prior art, and has as its object to provide an ultrasonic diagnostic apparatus capable of forming a correct focal point and achieving high resolution even when the diameter is increased. I do.

[0017]

An ultrasonic diagnostic apparatus according to the present invention for achieving the above object transmits ultrasonic waves into a subject, receives ultrasonic waves reflected in the subject, and receives each received signal. An ultrasonic probe consisting of a number of ultrasonic transducers arranged in a predetermined direction, a delay time for delaying each received signal and adding them to each other so as to form a focus that moves sequentially inside the subject A variable delay addition unit, a delay time control unit that controls each delay time of each reception signal in the delay addition unit, and a tomographic image inside the subject based on the reception signals output from the delay addition unit that are added to each other. In the ultrasonic diagnostic apparatus having display means for performing the above, the delay time control means controls the delay addition means.
The delay adding means may further include the plurality of ultrasonic transducers.
Each received signal obtained in each, the focal position to move sequentially, each arrangement position of each of the plurality of ultrasonic transducers,
The reception by one ultrasonic transducer based on the elapsed time from the point at which the ultrasonic wave was transmitted from the ultrasonic probe.
The obtained received signal is delayed corresponding to one focus.
Time delay and at the same time another ultrasonic transducer
The received signal obtained by reception corresponds to another focus
This includes the timing of delay by the delay time
As described above, individual decisions are made for each of
Characterized in that the constant is but the delay times digits applied応的is the CERUMO delayed.

Here, as the ultrasonic deep probe, there is provided a linear ultrasonic probe in which a number of ultrasonic transducers are linearly arranged, and the ultrasonic probe is perpendicular to the arrangement direction of the many ultrasonic transducers. In the case of a linear scanning type ultrasonic diagnostic apparatus which forms a simple scanning line and sequentially two-dimensionally scans the scanning line in the arrangement direction to obtain a rectangular tomographic image inside the subject, the delay time control The means is H for the distance between the scanning line and each ultrasonic transducer, t for the elapsed time from the time of ultrasonic transmission, V for the sound velocity inside the subject, K for each delay time, and negative for each delay time. When a predetermined constant for preventing the above is set to D, the delay adder is controlled so that each of the received signals is delayed according to the following equation: K = D−H ² / (V ² t) (4) It is said.

In the case of this linear scanning type ultrasonic diagnostic apparatus, the delay time control means controls the delay addition means based on each delay time K which is quantized in unit time and converted to an integer value. It is preferable that the delay time control unit obtains each delay time K using D, H / V, and t, which are quantized in advance in a unit time and converted into integer values. The configuration may be such that the delay addition means is controlled based on the delay time K. Alternatively, control may be performed using an expression obtained by appropriately modifying expression (4).

Further, as the above-mentioned ultrasonic probe, there is provided a convex type ultrasonic probe in which a number of ultrasonic probes are arranged in an arc shape, and a tangential line in the arrangement direction of the number of ultrasonic transducers is provided. In the case of a convex sector scanning type ultrasonic diagnostic apparatus which forms a vertical scanning line and sequentially moves the scanning line in the arrangement direction to perform two-dimensional scanning to obtain a fan-shaped tomographic image inside the object, the delay time The control means sets a radius of an arc in which the plurality of ultrasonic transducers are arranged to R, an angle between a scanning line and a line connecting the center point of the arc and each ultrasonic transducer to θ, and an ultrasonic transmission time. T, the sound velocity inside the subject is V, each delay time is K, and D is a predetermined constant for preventing each delay time K from being negative. {R / V (l-cos θ) (t + 2R / V)} / ｛R / V (l-co θ) + t} ... (5) as a delay in accordance with, and is configured for controlling said delay adding means.

In the case of the convex sector scanning type ultrasonic diagnostic apparatus, the delay time control means is quantized in a unit time to obtain an integer value as in the case of the above-described linear scanning type ultrasonic diagnostic apparatus. It is preferable that the delay addition means is controlled based on each of the converted delay times K. Alternatively, the delay time control means may be configured such that D, R /
It is preferable that the delay time K is obtained using V, R / V (l-cos θ), and t, and the delay addition means is controlled based on the delay time K. Alternatively, control may be performed using an expression obtained by appropriately modifying expression (4).

Further, as the ultrasonic probe, there is provided a linear ultrasonic probe in which a number of ultrasonic transducers are linearly arranged, and a predetermined point on the array of the number of ultrasonic transducers is determined. As described above, a scan line extending in a plane including the arrangement direction of the plurality of ultrasonic transducers and extending in a direction at a predetermined angle with respect to a normal to the arrangement direction is formed, and the scan line is changed in a direction in which the predetermined angle sequentially changes. In the case of a phased array sector scanning type ultrasonic diagnostic apparatus that obtains a fan-shaped tomographic image of the inside of the subject by sequentially performing two-dimensional scanning by sequentially moving the ultrasonic transducers, the delay time control unit includes the predetermined point and each ultrasonic transducer. H, the predetermined angle θ, the elapsed time from the point of transmission of the ultrasonic wave, t, the sound velocity inside the subject, V, each delay time K, and each delay time K is not negative. Where D is a predetermined constant of
The delay adding means is controlled so that each received signal is delayed according to the following equation: K = D− {H sin θ / V (t + H / (V sin θ))} / {t−H sin θ / V} (6) You.

Also in the case of this phased array sector scanning type ultrasonic diagnostic apparatus, the delay time control means is provided with each delay time K which is quantized in unit time and converted into an integer value.
It is preferable that the delay addition means is controlled based on the following. Alternatively, the delay time control means is an integer value D which is quantized in advance in a unit time,
Preferably, each delay time K is obtained using Hsin θ / V, H / (Vsin θ), and t, and the delay addition means is controlled based on each delay time K. Alternatively, control may be performed using an expression obtained by appropriately modifying expression (4).

[0024]

In the conventional dynamic focus method, the focus of reception is moved from, for example, the focus A shown in FIG. 6 to the focus B at a certain moment, that is, the reception delay means 10 (see FIG. 5) at a certain moment. Since the delay curve is switched from the curve of the focus A to the curve of the focus B, the above-described problem occurs. According to the present invention, the idea is changed and the elapsed time from the time when the ultrasonic wave is transmitted is changed. Based on each of the transducers, it calculates (or stores the calculation result) at which focal point the signal currently received by each of the transducers is a signal reflected at that focal point. Each delay time of each received signal obtained by the vibrator is determined.

More specifically, FIG.
A vibrator near the center O, for example, vibrator 1_64, 1
For the received signal obtained at _65, focus A at a certain time
Is switched to the delay time corresponding to the focal point B, the transducer near the end, for example, the transducer 1
_1 and 1_128, the ultrasonic waves reflected from the focal point A are generated by these vibrators (vibrator 1_128).
1, 1_128), and then switch to the delay time corresponding to the focal point B. As a result, even in a situation where the above inequality D> 2d / V is satisfied, a correct focus is achieved, and a high-resolution tomographic image can be obtained.

In the ultrasonic diagnostic apparatus of the present invention, each delay time with respect to each received signal obtained by each transducer basically includes a focal position which moves sequentially, and each arrangement of a plurality of ultrasonic transducers. It is determined based on the position and the elapsed time from the time when the ultrasonic wave was transmitted from the ultrasonic probe. Specifically, in each of the linear scanning ultrasonic diagnostic apparatus, the convex sector scanning ultrasonic diagnostic apparatus, and the phased array sector scanning ultrasonic diagnostic apparatus, the delay time K of each transducer is set to the above (4). ), (5), and (6).

In the conventional calculation of the delay time, the square root must be calculated as shown in the above equation (2), and the calculation of the square root requires a great amount of time. It has to be calculated separately for each transducer and each focal point. Therefore, due to the problem of calculation time and data volume,
It has to be calculated in advance outside the apparatus, and the data has to be written into, for example, a ROM or the like provided in the transmission delay amount storage means 4 and the reception delay amount storage means 7. In this case, particularly, the reception delay amount storage means 7 has an extremely large capacity. In addition, there is a possibility that it may be necessary to perform rewriting due to a change in the specification of the probe or a new addition. This is extremely disadvantageous in terms of cost, device size, device maintenance, and the like.

According to the present invention, as shown in the above equations (4), (5), and (6), the calculation of the square root is unnecessary, and the variable is only the elapsed time t, and the other coefficients are superfluous. It is a constant determined by the structure of the acoustic probe, the scanning pattern, and the like. Therefore, real-time high-speed calculation is possible, and the reception delay amount is calculated in real time instead of the reception delay amount storage means 7 (see FIG. 5). A calculation means can be provided, and in this case, it is possible to easily cope with a change in the specification of the probe or a new addition. Here, the above (4)
The derivation of the equations, (5) and (6) will be described.

First, equation (4) in the case of a linear scanning ultrasonic diagnostic apparatus will be described. FIG. 1 is an explanatory diagram of delay amount calculation in the case of linear scanning. First, time 0 is set immediately after the ultrasonic wave is transmitted from point O, and time t is set. It is assumed that an ultrasonic wave received at a point A (or A ′) at a certain time t and a distance H from the point O is reflected at a point F on a scanning line. At this time, if the length of the focal length line segment FO is k,

[0030]

(Equation 4)

The distance traveled by the ultrasonic wave up to time t is

[0032]

(Equation 5)

[0033]

[0034]

(Equation 6)

Therefore, the delay time K given to points A and A '
Is

[0036]

(Equation 7)

Is given by Next, equation (5) in the case of a convex sector scanning type ultrasonic diagnostic apparatus will be described. FIG. 2 is an explanatory diagram of delay amount calculation in the case of convex sector scanning. Here, R represents the radius of the convex probe, and θ represents the angle between the scanning line and a line connecting the radial center O and the transducer (point A). If the length of the focal length line segment FP is k,

[0038]

(Equation 8)

Here, the delay time K given to points A and A 'is

[0040]

(Equation 9)

Is given by Further, a case of a phased array sector type ultrasonic diagnostic apparatus will be described. FIG.
FIG. 9 is an explanatory diagram of delay amount calculation in the case of phased array sector scanning. Here, H represents the distance from the scanning center point O to each transducer, and θ represents the angle between the normal direction of the transducer array plane and the scanning line. Also, if the length of the focal length line segment FO is k,

[0042]

(Equation 10)

The delay time K given to the point A is

[0044]

[Equation 11]

Is given by Note that the delay time given to the point A 'can be obtained by substituting the distance from the point O to the point A' into the equation (6), assuming -H, so that the point A side is positive, the point A 'side is negative and H By adding a sign, it is directly calculated by equation (6). When setting the delay time of each reception signal obtained by each transducer based on the result of calculating the delay time K using the above equations (4), (5), and (6), the delay time Is quantized in unit time and converted to an integer value, and it is practical to delay the signal by the integer value. In addition, using the above equations (4), (5), and (6), Even when calculating the delay time (4),
If the predetermined values in the expressions (5) and (6) are converted into integer values in advance, higher-speed calculations can be performed, and it is particularly preferable when an arithmetic means for calculating the reception delay amount in real time is provided.

Here, a linear scanning ultrasonic diagnostic apparatus,
Although each of the convex sector scanning ultrasonic diagnostic apparatus and the phased array scanning ultrasonic diagnostic apparatus has been described, in configuring an actual ultrasonic diagnostic apparatus, a plurality of types of ultrasonic probes are provided. It is needless to say that an ultrasonic diagnostic apparatus having the above scanning pattern may be configured.

[0047]

Embodiments of the present invention will be described below. FIG. 4 is a configuration block diagram of an ultrasonic diagnostic apparatus according to one embodiment of the present invention. A duplicate description will be avoided, and only the differences from the conventional example shown in FIG. 5 will be described. In this embodiment, instead of the consultation delay amount storage means 7 shown in FIG.
2 are provided. This receiving delay amount calculating means 12
Equation (4) according to the type of the vibrator 1 and the scanning method,
Any of the equations (5) and (6) is performed in real time, and the reception based on the calculation result is performed so that each reception signal obtained by each transducer 1 is adaptively delayed by the reception delay means 10. The delay control data is set in the reception delay means 10.

It is to be noted that, in place of the reception delay amount calculating means 12, a storage means for storing the reception delay amount calculated in advance is provided as in the prior art, and the stored value is read out and the reception delay means 10 is stored. You may comprise so that it may control. Even in this case, it is possible to respond to a request for a large diameter.

[0049]

As described above, the ultrasonic diagnostic apparatus according to the present invention, when applying the dynamic focus method, determines the delay time of each received signal obtained by each transducer from the point at which the ultrasonic wave is transmitted. Is calculated for each transducer based on the elapsed time, and at which focal position the signal received by the transducer is reflected (or the calculation result is stored). , Each delay time of each received signal obtained by each transducer is determined, so that even if the aperture is large, a correct focus is formed, and high resolution can be achieved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of delay amount calculation in the case of linear scanning.

FIG. 2 is an explanatory diagram of delay amount calculation in the case of convex sector scanning.

FIG. 3 is an explanatory diagram of delay amount calculation in the case of phased array sector scanning.

FIG. 4 is a configuration block diagram of an ultrasonic diagnostic apparatus according to an embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration example of a conventional ultrasonic diagnostic apparatus.

FIG. 6 is a schematic diagram illustrating a relationship between an arrayed ultrasonic transducers and a focal position in a subject.

FIG. 7 is a schematic diagram showing a relationship between a vibrator and a delay time.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 oscillator 2 transmission driver 3 transmission delay means 4 transmission delay amount storage means 5 preamplifier 7 reception delay amount storage means 8 control means 9 reception delay addition means 10 reception delay means 11 addition means 12 reception delay amount calculation means

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-55-94242 (JP, A) JP-A-56-112234 (JP, A) JP-A-60-111645 (JP, A) JP-A 60-112 199438 (JP, A) JP-A-62-102743 (JP, A) JP-A-62-268539 (JP, A) JP-A-3-146034 (JP, A) (58) Fields investigated (Int. ⁷ , DB name) A61B 8/00-8/15

Claims (10)

(57) [Claims] 1. An ultrasonic transducer, which transmits ultrasonic waves into a subject and receives ultrasonic waves reflected in the subject to obtain respective received signals, includes a plurality of ultrasonic transducers arranged in a predetermined direction. An ultrasonic probe, delay time variable delay adding means for delaying each of the received signals and adding them to each other so as to form a focal point that sequentially moves inside the subject; and each of the received signals in the delay adding means. An ultrasonic diagnostic apparatus comprising: a delay time control unit that controls a delay time; and a display unit that displays a tomographic image inside the subject based on the received signals output from the delay addition unit and added together. The delay time control means controls the delay addition means
In this way, the plurality of ultrasonic vibrations
Each received signal obtained by each of the transducers, the focal position to sequentially move , the respective arrangement positions of the plurality of ultrasonic transducers, and the elapsed time from the time when ultrasonic waves are transmitted from the ultrasonic probe With one ultrasonic transducer based on
The received signal obtained by the signal corresponds to one focus
Another ultrasonic transducer that is delayed by the delay time and at the same time
The received signal obtained by the reception at
Timing that is delayed by the corresponding delay time.
So that each of the multiple ultrasonic transducers is individually
Ultrasonic diagnostic apparatus characterized by only the delay times determined are the CERUMO delayed suitable応的to. 2. The ultrasonic probe according to claim 1, further comprising a linear ultrasonic probe in which the plurality of ultrasonic transducers are linearly arranged, and wherein the linear ultrasonic probe is arranged in a direction in which the plurality of ultrasonic transducers are arranged. A linear scanning ultrasonic diagnostic apparatus for forming a vertical scanning line and sequentially moving the scanning line in the arrangement direction to perform two-dimensional scanning to obtain a rectangular tomographic image inside the subject, wherein the delay time The control means sets the distance between the scanning line and each ultrasonic transducer to H, the elapsed time from the transmission time of the ultrasonic wave to t, the sound velocity inside the subject to V, the respective delay times to K, and the respective delay times to K
When the predetermined constant for preventing the negative value from being negative is D, the delay adding means is controlled so that each of the received signals is delayed according to the following equation: K = D−H ² / (V ² t). The ultrasonic diagnostic apparatus according to claim 1, wherein: 3. The delay time control means according to claim 1, wherein the delay time control means quantizes the delay time K into an integer value by quantizing the unit time.
3. The ultrasonic diagnostic apparatus according to claim 2, wherein the delay adding means is controlled based on the following. 4. The method according to claim 1, wherein said delay time control means quantizes D, H / V,
3. The ultrasonic diagnostic apparatus according to claim 2, wherein each of said delay times K is obtained by using said delay time and t, and said delay adding means is controlled based on each of said delay times K. 5. An ultrasonic probe according to claim 1, wherein said ultrasonic probe comprises a convex ultrasonic probe in which said plurality of ultrasonic probes are arranged in an arc shape. A convex sector scanning ultrasonic diagnostic apparatus for forming a scanning line perpendicular to a tangent line and sequentially moving the scanning line in the arrangement direction to obtain a fan-shaped tomographic image inside the subject by two-dimensional scanning, The delay time control means sets a radius of an arc on which the plurality of ultrasonic transducers are arranged to R, an angle between a scanning line and a line connecting the center point of the arc and each ultrasonic transducer to θ, Assuming that the elapsed time from the transmission of the sound wave is t, the sound speed inside the subject is V, each delay time is K, and a predetermined constant for not making each delay time K negative is D, the received signals are: K = D− {R / V (1-cos θ) (t + 2R / V)} / {R / V l-cosθ) + t} As the delay in accordance with, the ultrasonic diagnostic apparatus according to claim 1, characterized in that for controlling the delay adding means. 6. The delay time control unit according to claim 1, wherein the delay time control unit quantizes the delay time K into an integer value by quantizing the unit time.
6. The ultrasonic diagnostic apparatus according to claim 5, wherein the delay adding means is controlled based on the following. 7. The delay time control means, wherein D, R / V, D, R / V,
6. The delay unit according to claim 5, wherein the delay times are obtained by using R / V (1-cos .theta.) And t, and the delay adding means is controlled based on the delay times. Ultrasound diagnostic equipment. 8. The ultrasonic probe according to claim 1, further comprising a linear ultrasonic probe in which the plurality of ultrasonic transducers are linearly arranged, and a position on the arrangement of the plurality of ultrasonic transducers. A scan line that passes through a fixed point and extends in a plane including the arrangement direction of the plurality of ultrasonic transducers and extends in a direction at a predetermined angle with respect to a normal to the arrangement direction is formed, and the predetermined angle of the scan line is sequentially changed. A phased array sector scanning type ultrasonic diagnostic apparatus that obtains a fan-shaped tomographic image of the inside of the subject by performing two-dimensional scanning by sequentially moving in a direction in which the predetermined point and each of the ultrasonic waves are moved. The distance from the transducer is H, the predetermined angle is θ, the elapsed time from the ultrasonic transmission time is t, the sound velocity inside the subject is V, each delay time is K, and each delay time K is negative. Assuming that a predetermined constant for not performing is D, each of the received signals is K = D− ｛H sin θ / V (t + H / (V sin
2) The ultrasonic diagnostic apparatus according to claim 1, wherein the delay adding means is controlled so as to be delayed according to the following equation:? / {t-Hsin? / V}. 9. The delay time control unit according to claim 1, wherein the delay time control unit quantizes each of the delay times K by quantizing in unit time.
9. The ultrasonic diagnostic apparatus according to claim 8, wherein the delay adding means is controlled based on the following. 10. The delay time control means according to claim 6, wherein said delay time control means quantizes D, Hsi
9. The apparatus according to claim 8, wherein said delay times K are obtained by using n.theta./V, H / (Vsin .theta.), and t, and said delay adding means is controlled based on said respective delay times K. Ultrasonic diagnostic equipment.