JP2003265479A - Ultrasound diagnostic equipment - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide an ultrasonic diagnostic apparatus capable of preventing misjudgment that is likely to occur due to misunderstanding or misunderstanding of measured values and calculation results in various measurements. An ultrasonic wave that transmits an ultrasonic wave into a subject, receives an ultrasonic wave reflected back in the subject, returns a received signal, and displays an image in the subject based on the received signal. The diagnostic apparatus includes a function measurement unit that measures a function in the subject based on the received signal, and a measurement value display unit that displays a value measured by the function measurement unit. Displays an index of the degree of the value deviating from the standard value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic diagnostic apparatus for displaying an image showing the state of internal tissue based on a reception signal obtained by transmitting and receiving ultrasonic waves to and from internal tissue of the human body.

[0002]

2. Description of the Related Art Conventionally, there are a method of using a pulse ultrasonic wave and a method of using a continuous wave ultrasonic wave as a method of measuring the state of internal tissues of a human body using ultrasonic waves. The method using pulsed ultrasonic waves is to send an ultrasonic pulse inside the human body and receive reflected ultrasonic waves to display an image of the internal form of the human body.
There are a B-mode method for displaying the amplitude of reflected ultrasonic waves in luminance and an M-mode method for displaying the temporal change of a moving reflecting source.
The method using continuous wave ultrasonic waves is to transmit continuous wave ultrasonic waves to a reflection source and utilize the Doppler effect to measure blood flow, and for example, for blood cells that move in blood vessels (target). When an ultrasonic wave hits, the reflected ultrasonic wave shifts to a high frequency or a low frequency due to the Doppler effect,
The continuous wave Doppler method is used to measure the blood flow velocity, direction, etc. by obtaining the shifted frequency. In the continuous wave Doppler method, an ultrasonic continuous wave is transmitted and a reflected ultrasonic wave is received at the same time by dividing a transducer into a transmitter only and a receiver only.

However, since the continuous wave Doppler method cannot specify the depth of the blood flow, the pulse Doppler method is used for measuring the blood flow whose depth must be specified. In the pulse Doppler method, ultrasonic burst wave transmission and reflected ultrasonic wave reception are alternately repeated using the same transducer, and the time from transmission to reception is proportional to the depth of the target. Therefore, the signal when a predetermined time has elapsed after the wave transmission is sampled, and the blood flow velocity specified at a certain depth is measured from the Doppler-shifted frequency.

The ultrasonic diagnostic apparatus measures the size and blood flow state of a predetermined part of human body tissue, switches the type of ultrasonic wave to be transmitted in order to obtain measurement values representing various functions of internal tissue, By replacing the probe for transmitting waves, the various types of methods described above can be combined for diagnosis.

FIG. 1 is a diagram showing an example of a flow for measuring, for example, the left ventricle function by the area-length method / B-mode elliptic approximation method in cardiovascular measurement using an ultrasonic diagnostic apparatus.

In FIG. 1, when the measurement method (AL-E; the left ventricular function is measured by the Area-length method / B-mode ellipse approximation method) is selected (S-1), the contour of the internal tissue is traced. The caliper mark 10 and the measurement item 11 for specifying the position and the position are displayed (S-2),
The trackball (not shown) for moving the caliper mark is operated to move the caliper mark 10 to the left ventricular end-diastolic image 1.
If you move to 2 and set it, the cursor 13 will move to measurement item 1
1 (EDA) is displayed (S-3). Caliper mark 1
When 0 is set to the major axis 14 and the minor axis 15 of the ellipse, the left ventricular end diastolic area (ED
A), left ventricular end diastolic major axis diameter (EDL), left ventricular end diastolic minor axis diameter (EDS), left ventricular end diastolic volume (EDV) are displayed on the screen. Next, by operating the trackball to move and set the caliper mark 10 to the left ventricular end systole image,
The cursor 13 displays the measurement item 11 (ESA). When the caliper mark 10 is set on the major axis and the minor axis of the ellipse respectively, the left ventricular end systolic area (ESA), the left ventricular end systolic major axis diameter (ESL), and the left ventricular end systolic minor axis diameter ( ESS) and left ventricular end systolic volume (ESV) are displayed on the screen (S-4).

When all the measurement items are completed (S-5), the stroke volume (SV) for one stroke is calculated based on the measured values, and when the heart rate (HR) is input, the cardiac output (CO ), The ejection fraction (EF) is calculated (S-6), and when the calculation result is displayed (S-7), the measurement ends (S-8). After the measurement is completed, all the measurement results can be displayed in a list or the measurement results can be stored in the memory.

FIG. 2 is a diagram schematically showing a list of measurement results of the heart as an example.

In the list of measurement results shown in FIG. 2, the identification number (ID), sex (SEX), and age (AGE) of the subject are displayed, and the measurement / calculation value by each measurement method, for example, is displayed below it. Area-length method (measurement / calculation value 1), S
IMPSON method (measurement / calculation value 2), GIBSON method (measurement / calculation value 3), aortic valve measurement (measurement / calculation value 4)
The measured and calculated values by are displayed respectively.

However, the measured value and the calculation result displayed at each measurement are different in the standard value which represents the allowable range depending on the subject's sex, age, size, etc., and also depending on the symptom of the patient. , There are a wide variety of measurement items and measurement methods to be measured. Therefore, when judging the state of the subject based on the displayed numerical values, there is a risk of misjudgment or misjudgment.

[0011]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention is capable of preventing a misjudgment that is likely to occur due to misunderstanding or misunderstanding of a measured value or calculation result in various measurements. An object is to provide a diagnostic device.

[0012]

An ultrasonic diagnostic apparatus of the present invention that achieves the above-mentioned object transmits an ultrasonic wave into a subject and receives and receives an ultrasonic wave reflected and returned in the subject. In an ultrasonic diagnostic apparatus that obtains a signal and displays an image inside the subject based on the received signal, a function measuring unit that measures a function inside the subject based on the received signal, and a measurement value by the function measuring unit. And a measurement value display means for displaying, and the measurement value display means displays, together with the measurement value, an index of the measurement value deviating from a standard value.

As described above, since the measurement result is displayed as a numerical value and the index compared with the standard value is displayed, it is possible to prevent misjudgment or misjudgment of the measured value, or misjudgment due to misunderstanding.

Here, the function measuring means has a site specifying means for specifying a predetermined site of the displayed image of the inside of the subject according to a manual operation, and the size of the site specified by the site specifying means. It is preferable that the function in the subject is measured by the calculation using the obtained size, angle, or velocity in addition to the determination of the angle, the velocity, or the speed, and the display image in the subject is a still image from a moving image. It is also possible to provide an interface to which a timing signal to be changed is input, and the part specifying means specifies the predetermined part based on the still image displayed by the timing signal.

The image to be measured can be automatically stopped, and the function in the subject can be measured by a simple operation based on these images.

Further, storage means for storing the standard value corresponding to the attribute or size of the subject and the allowable amount from the standard value, and the attribute or size of the subject are acquired and stored from the storage means. , The standard value and the permissible amount according to the attribute or size of the subject, and the standard value of the measured value displayed on the function measuring means based on the read standard value and the permissible amount. It is preferable that the measurement value display means displays the index calculated by the calculation means together with the measurement value.

As described above, the standard value and the permissible amount thereof are stored in the memory for each attribute or size of the subject, and the necessary standard value and the permissible amount are read out whenever necessary, and the index is arithmetically processed. Therefore, the index can be displayed at high speed.

Further, the calculating means has a first permissible range obtained by adding or subtracting the permissible amount to the standard value, and a second permissible range obtained by adding or subtracting an amount smaller than the permissible amount to the standard value. By obtaining the allowable range and selecting whether the measured value belongs to the first or second allowable range, an index of the measured value deviating from the standard value can be obtained. It is also a preferable embodiment.

If the allowable range is divided into two in this way,
Fine-grained index can be obtained.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the ultrasonic diagnostic apparatus of the present invention will be described below.

FIG. 3 is a schematic block diagram showing the ultrasonic diagnostic apparatus of this embodiment.

The ultrasonic diagnostic apparatus shown in FIG. 3 includes a transmission control section 23 for transmitting a trigger pulse, a transmission circuit 21 for transmitting a pulse signal obtained by amplifying the trigger pulse, and an ultrasonic wave excited by the pulse signal to the subject. A probe 20 that receives an ultrasonic wave that has been transmitted into the interior of the subject and is reflected by the subject and returned to obtain a received signal, a receiving circuit 22 that amplifies the received signal, and a predetermined process is performed on the amplified received signal. A reception control unit 24 and a display control unit 2 for performing image processing on the reception signal processed by the reception control unit 24 and displaying an image according to each mode on the display unit.
5, a display unit 27 for displaying the received signal image-processed by the display control unit 25, a keyboard (KEY) 28 for giving a predetermined command to each control unit via the CPU 30,
The caliper mark displayed on the display unit 27 is moved to a predetermined position, and a trackball 29 for specifying a part of the displayed image and a CPU 30 for interrupting based on a signal input from the KEY 28 and information from the trackball 19 are inserted. An KEY control unit 26 that makes an interrupt request, a memory 31 that stores a standard value and a permissible value of a function in the subject and an execution program, and adjusts the operation of each control unit based on the program or performs a predetermined calculation. CPU30 and CPU
A CP that connects between the control unit 30 and each control unit to send and receive various signals
U BUS 30a. Further, the ultrasonic diagnostic apparatus includes an electrocardiographic unit 32 that measures an electrocardiogram as a CPU.
There is an interface 30b connected to the BUS 30a, and a predetermined timing signal for displaying a tomographic image of the left ventricle displayed on the display unit 27, for example, a still image at end diastole or end systole, can be obtained from the electrocardiographic unit 32. .

Here, the function measuring means of the present invention is the trackball 29, the CPU 30, and the display control unit 2 of this embodiment.
5 and the display unit 27, and the measured value display unit of the present invention corresponds to the CPU 30, the display control unit 25, and the display unit 27 of the present embodiment. Further, the CPU 30 of the present embodiment corresponds to the calculation means for calculating the index of the present invention.

In the present embodiment, the electrocardiographic unit 32 is connected via the interface 30b, and the R wave and Q of the electrocardiogram are obtained.
Wave or T-wave signal is input and a still image of ventricular end diastole or end systole is automatically displayed, but a timing signal for connecting the electrocardiographic unit 32 to display a still image Need not be obtained, and a still image may be displayed manually.

When measuring the function in the subject by using the ultrasonic diagnostic apparatus of this embodiment, first, personal information such as an identification number (ID) and sex is input from the KEY 28, and
A measurement type, for example, left ventricular function measurement is input, and a measurement method, for example, Area-length method is designated. Then, for example, a B-mode image of the left ventricle is displayed on the display unit 27, a timing signal is obtained from the electrocardiographic unit 32 by specifying the measurement item as, for example, the end diastole, and the tomographic image of the left ventricle is the end diastole image. Make it stationary. Then, the caliper mark is moved by the trackball 29, and the long axis and the short axis of the left ventricle are set by the caliper mark by using, for example, an ellipse approximation method, and then the CPU 30 causes the long axis to be based on the command from the KEY control unit 28. The diameter, the minor axis diameter, the end-diastolic area and volume of the left ventricle, etc. are obtained, and the obtained results are displayed on the display unit 27. Instead of the elliptic approximation method, for example, using the tracing method,
When the locus of the left ventricle is drawn on the end diastole image with the caliper mark, the CPU 30 obtains the area based on the command from the KEY control unit 28, then obtains the major axis diameter, the minor axis diameter, and the volume, and obtains the result. Can be displayed on the display unit 27.

When all the measurement items are completed, the stroke volume and the like are calculated, and the measured value including the calculated result and the calculated result is displayed on the display unit 27. The heart rate may be input from KEY.

Next, the CPU 30 sets the P of the memory 31 based on the attributes or dimensions of the subject input from the KEY 28.
The standard value stored in the ROM, which represents the standard of the function in the subject, and the permissible amount from the standard value are read out, and the permissible range is obtained from the read standard value and permissible amount, and the permissible range and the measured value. By comparing with, the index of the measured value deviating from the standard value is obtained, and the obtained index is displayed on the display unit 27.

Here, the attributes or dimensions of the subject input from the KEY 28 include an identification number (ID), sex, age,
Height and weight are included. In addition, the PROM stores standard values corresponding to those attributes or dimensions, and an allowable amount that represents an allowable level from the standard values.

In this embodiment, the CPU obtains a first allowable range obtained by adjusting the allowable amount to the standard value and a second allowable range obtained by adjusting the standard value by half the allowable amount. At the same time, the index of the measured value deviating from the standard value is obtained by selecting which of the first and second allowable ranges the measured value belongs to. However, the second allowable range is not always required. There is no need to limit what is obtained by adding and subtracting half the allowable amount to the standard value, and any amount that is smaller or smaller than the allowable amount may be used. Further, the allowable range does not have to be limited to two, and three or more may be provided.

An index obtained by the CPU by selecting whether each of the measured values belongs to the first allowable range, the second allowable range, or deviates from the first allowable range. Is displayed on the display unit as a graph so that it can be seen at a glance.

FIG. 4 is a schematic diagram showing an example of the standard value table stored in the PROM of the memory.

The standard value table shown in FIG.
FIG. 3 shows a memory structure in which a standard value used when performing left ventricular function measurement using the length method and an allowable amount thereof are stored. The first column stores measurement items and the second and subsequent columns are stored. Indicates that the standard value and the allowable amount are gender, age, and height, for example, in the second and third columns, male, under 45 years old, 17
0 cm or less, for example, the rightmost two columns are female, over 50 years old, 1
It is memorized in correspondence with each exceeding 55 cm. The standard value is EDA (left ventricular end diastolic area) in order from the first row.
Is 30.0, EDL (left ventricular end-diastolic major axis diameter) is 6.5,
EDS (left ventricular end diastolic minor axis diameter) of 6.0, EDV (left ventricular end diastolic volume) of 123, ESA (left ventricular end systolic area)
Is 11.8, ESL (left ventricular end systolic major axis diameter) is 5.0,
ESS (left ventricular end-diastolic minor axis diameter) is 3.0, ESV (left ventricular end-systolic volume) is 24, SV (stroke volume) is 99, H
R (heart rate) is 55, CO (cardiac output) is 5.5, EF
(Ejection rate) is set to 75.

FIG. 5 is a schematic diagram showing a process of obtaining, by the CPU, a measured value and an index of the measured value deviating from the standard value.

In FIG. 5, the standard value and its allowable amount are
Since it is stored in the PROM area of the memory, the CPU reads out the necessary standard value and its allowable amount from the PROM based on the inputted attribute or size each time it is necessary, and temporarily stores it in the work RAM area. And work RA
The degree of deviation from the standard value by comparing the measured value (measured value obtained as a result of a series of measurements) already stored in the M area with the read standard value and the allowable range obtained from the allowable amount. Create a result list that includes the indicators. The result list is
It is displayed on the display unit via the display control unit and
It is stored in an external storage medium such as.

FIG. 6 is a diagram showing a flow when measurement is performed using the ultrasonic diagnostic apparatus of this embodiment.

In FIG. 6, when the power of the ultrasonic diagnostic apparatus is turned on, a subject information input screen is displayed (S-2
1), items to be displayed, for example ID (identification number), SE
Predetermined information is input from KEY according to X (sex), AGE (age), etc. (S-22). When all items have been input (S-23), the display mode is selected, the measurement menu is displayed, and the measurement method is selected (S).
-24). For example, AL-E (left ventricular function measurement is Area-
When the length method / the B-mode ellipse approximation method is selected), the caliper mark 10 and the measurement item (EDA) 13 that specify the contour of the internal tissue or a predetermined part are displayed (S-25). . When the caliper mark 10 is moved to and set on the left ventricle end diastolic image 12 by operating the trackball, the cursor displays the measurement item (EDA) 13 (S-26). When the caliper mark 10 is set on the major axis 14 and the minor axis 15 of the ellipse, respectively, the left ventricular end diastolic area (EDA), which is the measured value, the left ventricular end diastolic major axis diameter (EDL), which is the measured value, and the left ventricle End diastolic short axis diameter (ED
S), the left ventricular end diastolic volume (EDV) is displayed on the screen (S-27). Next, when the caliper mark is moved to and set on the left ventricular end systole image by operating the trackball, the cursor displays the measurement item (ESA) (S-26).
When the caliper marks are set on the major axis and the minor axis of the ellipse, respectively, the left ventricular end systolic area (E
SA), left ventricular end systolic major axis diameter (ESL), left ventricular end systolic minor axis diameter (ESS), and left ventricular end systolic volume (ESV) are displayed on the screen (S-27). When all measurement items are completed in this way (S-28), predetermined calculation is performed based on the measured values, and stroke volume (SV), heart rate (HR),
The cardiac output (CO) and the ejection fraction (EF) are calculated (S-29), and the calculation results are displayed (S-30). At this time, if the user wants to display the index, he / she inputs predetermined information from the KEY (S-31), and "automatic analysis" for displaying the index is made (S-32), and the predetermined information is not input. The measurement is finished after a certain time (S-3
3). At this time, all the measurement results can be displayed in a list or the measurement results can be stored in the memory.

7 to 9 are views showing a processing flow for displaying the index of the measured value when "automatic analysis" is selected when the measurement is performed using the ultrasonic diagnostic apparatus of this embodiment. is there.

In FIG. 7, when "automatic analysis" is selected, a tree-structured program 40 that branches in the order of gender 35, age 36, and height 37 based on the input attributes or dimensions of the subject is entered. The calculation is performed to determine the columns of the standard value table shown in FIG. For example, if the input subject information is a male, younger than 45 years old, and a height of 175 cm, the standard value stored in the second column of the standard value table and the allowable amount stored in the third column Is read out,
The first allowable range and the second allowable range are obtained and temporarily stored in the work RAM area.

Next, a comparison (B) is performed between the obtained first and second allowable ranges and the obtained measured values stored in the same work RAM area. First, the measured value of EDA, which is the first measurement item, is compared 41 with the first allowable range, and if it is out of the first allowable range,
The process moves to that of FIG. If it is within the first allowable range, it is further compared with the second allowable range 42, and if it is outside the second allowable range, the process proceeds to FIG. 8 and if it is within the second allowable range. Then, the process moves to that of FIG.

In the case of shifting to and of FIG. 8, for example, "○" is displayed in the corresponding position of the measurement item EDA column of the "automatic analysis" screen, and
In the case of, “Δ” is displayed, in the case of, “×” is displayed, and the number of items for which “×” is displayed is counted by the NG counter. Below, EDL, EDS, EDV, E
Similar comparisons are made for each measurement item such as SA, ESL, ESS, and ESV.

When the comparison (B) with the obtained measured value is completed, the comparison (C) with the calculated measured value (hereinafter referred to as a calculated value) shown in FIG. 7 is performed.

The calculated value of SV, which is a measurement item, is compared 43 with the first allowable range, and if the calculated value is out of the first allowable range, the process proceeds to FIG. If it is within the first allowable range, it is further compared with the second allowable range 44. If it is out of the second allowable range, the process proceeds to FIG. 9 and if it is within the second allowable range. Shifts to that of FIG.

In the case of shifting to and of FIG. 9, for example, "○" is displayed in the corresponding position of the measurement item SV column of the "automatic analysis" screen, and "△" is displayed in the case of. Is displayed, and in the case of, “x” is displayed. Hereinafter, the same comparison is made for each measurement item such as HR, CO, and EF. Then, when the comparison with the standard values for all measurement items is completed and the calculated value is "○" and the count number of the NG counter is "zero", it is displayed in the analysis result display area of the "automatic analysis" screen. "Normal range"
Is displayed. When the calculated value is "△" and the count number of the NG counter is not "zero", "Inside the normal range, but caution is required" is displayed in the analysis result display area of the "Automatic analysis" screen. , If the calculated value is ×, “Out of normal range” is displayed and the measurement ends.

FIG. 10 is a diagram showing an example of the analysis result displayed on the "automatic analysis" screen.

As shown in FIG. 10, on the "automatic analysis" screen, the measurement item and its measured value and calculated value are displayed numerically for each measuring method (for example, AREA LENGTH), and the first allowable range and The result of comparison with the second allowable range is displayed with symbols such as "○", "△", and "×", and the "○" area () is green, the "△" area () is yellow, and "×". Since the area () is displayed in red, measured values and the like can be grasped at a glance.
Also, although not shown, the evaluation for all measurement items is
For example, three levels are displayed, such as "normal range", "inside normal range, but needs attention", "out of normal range".

[0046]

As described above, according to the ultrasonic diagnostic apparatus of the present invention, the measurement result is displayed as a numerical value, and the standard value and the index compared with the allowable value are displayed in an easy-to-understand manner. It is possible to prevent misjudgment due to misrecognition, misperception, or misunderstanding.

[Brief description of drawings]

FIG. 1 Among circulatory system measurement, for example, the left ventricular function is Area.
It is a figure which shows an example of the flow measured by the -length method / B mode ellipse approximation method.

FIG. 2 is a diagram schematically showing a heart measurement result list as an example.

FIG. 3 is a schematic configuration diagram showing an ultrasonic diagnostic apparatus of this embodiment.

FIG. 4 is a schematic diagram showing an example of a standard value table stored in a ROM of a CPU.

FIG. 5 is a schematic diagram showing a process of calculating a measured value and an index of the measured value deviating from a standard value.

FIG. 6 is a diagram showing a flow when measurement is performed using the ultrasonic diagnostic apparatus of the present embodiment.

FIG. 7 is a diagram showing a processing flow for displaying an index of a measured value when “automatic analysis” is selected when performing measurement using the ultrasonic diagnostic apparatus of this embodiment.

FIG. 8 is a diagram showing a processing flow for displaying an index of a measurement value when “automatic analysis” is selected when performing measurement using the ultrasonic diagnostic apparatus of this embodiment.

FIG. 9 is a diagram showing a processing flow for displaying an index of a measurement value when “automatic analysis” is selected when performing measurement using the ultrasonic diagnostic apparatus of this embodiment.

FIG. 10 is a diagram showing an example of an analysis result displayed on an “automatic analysis” screen.

[Explanation of symbols]

10 caliper mark 11 measurement items 12 Left ventricular end-stage image 13 cursor 14 long axis 15 Minor axis 20 probes 21 Transmitter circuit 22 Receiver circuit 23 Transmission control unit 24 Reception control unit 25 Display control unit 27 Display 28 Keyboard (KEY) 29 trackball 30 CPU 30a CPU BUS 30b interface 31 memory 32 ECG unit 35 sex 36 age 37 height 40 tree structure program 41,43 Compare with the 1st tolerance 42,44 Compare with the second tolerance

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 4C301 AA02 DD01 DD06 DD10 EE11                       EE20 FF28 KK01 KK24 KK27                       KK31 KK34 KK40 LL05 LL20                 4C601 DD03 DD07 DD26 EE09 EE30                       FF08 JC40 KK01 KK28 KK31                       KK33 KK36 KK50 LL01 LL05                       LL40                 5B057 AA07 BA05 BA24 CA12 CB12                       CH01 CH11 CH14 DA08 DA16                       DB02 DC04 DC08                 5L096 BA06 BA13 CA24 DA01 FA06                       FA59

Claims (4)

[Claims] 1. An ultrasonic wave is transmitted to the inside of a subject, the ultrasonic wave reflected and returned within the subject is received to obtain a reception signal, and an image inside the subject is displayed based on the reception signal. In the ultrasonic diagnostic apparatus, a function measuring unit that measures a function in the subject based on the received signal, and a measurement value display unit that displays a measurement value by the function measuring unit, the measurement value display unit, An ultrasonic diagnostic apparatus displaying, together with the measured value, an index of the measured value deviating from a standard value. 2. The function measuring means has a site specifying means for specifying a predetermined site of the displayed image in the subject according to a manual operation, and the size of the site specified by the site specifying means. , The angle or speed is calculated, and the size is calculated,
The ultrasonic diagnostic apparatus according to claim 1, wherein the function in the subject is measured by calculation using an angle or a velocity. 3. Storage means for storing the standard value corresponding to an attribute or size of a subject and an allowable amount from the standard value, and an attribute or size of the subject is acquired and stored from the storage means. ,
While reading the standard value and the allowable amount according to the attribute or size of the subject, from the standard value of the measured value displayed on the function measuring means based on the read standard value and the allowable amount The calculation means for obtaining an index of the degree of deviation, the measurement value display means displays the index obtained by the calculation means together with the measurement value. Ultrasonic diagnostic equipment. 4. The calculation means includes a first allowable range obtained by adding and subtracting the allowable amount to the standard value, and a second allowable range obtained by adding and subtracting an amount smaller than the allowable amount to the standard value. By obtaining the allowable range and selecting which of the first and second allowable ranges the measured value belongs to, an index of the measured value deviating from the standard value can be obtained. The ultrasonic diagnostic apparatus according to claim 3, wherein the ultrasonic diagnostic apparatus is present.