JPS60116337A - Doppler blood flow meter output system - 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] [Technical Field of the Invention] The present invention relates to a Doppler blood flow meter that can simultaneously measure blood velocity data at multiple points, and particularly relates to a Doppler blood flow meter that can measure blood velocity data at multiple points at the same time. Displays the flow velocity and drains 2 according to the flow velocity
It is designed to generate sound.

[Conventional technology and problems]

There is a Dob 2 blood flow needle that utilizes the Doppler effect as a method for measuring the flow velocity of blood in the blood vessels of the human body. This Doppler blood flow needle uses the Doppler effect, in which when ultrasound with a known frequency is applied to blood, the frequency of the reflected wave from the blood changes higher or lower depending on the blood flow velocity, and analyzes the frequency change. This is used to measure the blood flow rate (blood flow).

Doppler blood flowmeters are also used that simultaneously measure blood flow velocities at multiple points from the surface of the human body to a certain depth using such Doppler blood flow needles.

This multi-point simultaneous measurement Dobu 2 blood flow needle is, for example, 20MH.
approximately 1 at intervals of 0.3 F1a using ultrasonic waves of z
Since the blood flow at 50 locations up to a depth of 5111 can be measured simultaneously, it is possible to measure, for example, the condition of blood vessels. The state of this blood flow is then converted into sound, and the faster the blood flow, the higher the sound, and the slower the blood flow, the lower the sound, producing the so-called Doppler sound.

By the way, in the conventional multi-point simultaneous measurement type Doppler blood flow meter, the selection of time-series blood velocity data and Doppler sound generation point was achieved by manual means such as key input from outside. Since the position of blood vessels varies greatly from person to person, it is necessary to move the position of the point each time the ultrasonic probe for measurement is moved, which has the disadvantage that both hands cannot be used freely for measurement.

[Purpose of the invention]

The purpose of the present invention is to improve these drawbacks.

By selecting the point with the maximum absolute value of blood flow velocity from the measurement data of multiple sample points, the time-series blood flow velocity is automatically selected and displayed, or Doppler sound is generated. This provides a Doppler blood flow meter output method.

[Structure of the invention]

In order to achieve this purpose, the Doppler blood flow meter output method of the present invention uses a Dog 2 blood flow needle that can simultaneously measure the flow velocity at multiple sample points, and automatically detects the point at which the absolute value of the blood flow velocity in the measurement data is the highest. Maximum point searching means for performing tracking, data selection means controlled by this maximum point searching means, display means for visually displaying the output of this data selection means, or output of the data selection means according to the blood flow velocity. The present invention is characterized in that it includes an audible sound generating means that outputs an audio signal to generate Doppler sound.

[Embodiments of the invention]

Before describing one embodiment of the present invention in detail, its outline will be explained.

In the present invention, when measuring blood flow, data is measured at multiple locations from the body surface to a predetermined depth.

The maximum flow velocity point is detected, and the flow velocity data at the maximum flow velocity point is output as maximum flow velocity data. This makes it possible to accurately detect the blood vessel position and measure its blood flow even if there is a large variation in the blood vessel position due to individual differences. Then, the maximum flow velocity data is obtained in this way, and converted into, for example, an audio signal with a frequency corresponding to the flow velocity, and outputted as a preface.

This eliminates the need for the doctor to manually search for the sample point where the maximum blood flow velocity exists in the flow velocity data.

Since the speed of blood flow can be determined to some extent by sound, doctors can focus their hands and eyes on the patient during diagnosis.

An embodiment of the present invention will be described based on FIGS. 1 and 2. FIG.

FIG. 1 is an example of a display suitable for the Doppler blood flow meter output method of the present invention, and FIG. 2 is a configuration diagram of an embodiment of the present invention.

In the figure, reference numeral 1 denotes an ultrasonic probe which outputs an ultrasonic signal based on an oscillation signal transmitted from a carrier oscillation unit 9 (to be described later), receives an ultrasonic signal reflected from blood, and converts it into an electrical signal. Something to do.

2 is a receiving amplifier that amplifies the signal received by the ultrasonic probe, 6 is a real mixer that multiplies the received signal by a carrier to obtain the real part of the demodulated signal, and 4 is an imaginary mixer that amplifies the received signal by 90%. 5 is a 90 degree delay circuit which outputs a carrier delayed by 90 degrees to obtain the imaginary component; 6 is a complex direction detection circuit. By adding the outputs of the Littell section mixer 3 and the input and output section mixers 4, a frequency corresponding to the blood flow velocity is obtained, and a frequency analysis circuit that calculates the blood flow velocity accordingly. In this case, the flow velocity at a plurality of measurement points is calculated as described later. 7 is a transmission amplifier which transmits the oscillation signal output from the carrier oscillation unit 9 to the ultrasound probe 1 under the control of the transmission timing control unit 8; 8 is a transmission timing control unit which outputs four files at regular intervals; 9 is a carrier oscillation unit that oscillates an electric signal at an ultrasonic frequency of 20 MHz, for example. 10 is a data selector which selects one of the flow velocities at a plurality of measurement points output from the complex direction detection circuit 6.
11 is a left register which holds a predetermined number of flow velocity data from a plurality of measurement points.

For example, flow velocity data of measured values for 2 seconds is held. 12 is an accumulator that adds the predetermined number of data held in the shift register 11 for each measurement point and subtracts this from the instantaneous value of each measurement point;
13 is a maximum point search circuit which performs the above accumulation p1.
1 detects the maximum value among the calculated values for each measurement point outputted from 2 and outputs it to the data selector 10; 14 is a display output control section for various controls for displaying on the display output section 16; 15 is a bit-grain memory in which data to be displayed is set in a display output section 16; 16 is a display output section such as a CRT for displaying and outputting measurement data; 17; 18 is a D/A converter that converts a digital signal into an audible analog signal; 18 is an audio amplifier that amplifies the analog signal output from the D/A converter 17; 19; The audio output unit outputs an audible signal from speakers, headphones, etc.

As shown in FIG. 1, the display output section 16 displays an electrocardiogram E +
Scroll profile SP9 A selected point flow velocity waveform VP indicating the blood flow at the selected point, a maximum point flow velocity waveform VM indicating the flow velocity at the maximum point, a blood flow waveform VL indicating the blood flow rate, a fixed profile FP, etc. are displayed. Here, the scroll profile SP is a measurement point that is approximately 1.5 cm deep from the body surface at a distance of, for example, 0.3 mm, and the blood flow in that area is shown in terms of depth on the vertical axis and time on the horizontal axis. The curved portion of each line indicates the blood flow velocity, and since the measuring means is well known, the details thereof will be omitted.

The fixed profile shows the latest profile, and is the latest data that is not displayed at the right end of the scroll profile SP.
Conversely, the horizontal axis shows the depth from the body surface, and the vertical axis shows the speed of blood flow. Point P indicates a specified point, and point M indicates the position of the maximum value of this profile.

A characteristic display of the present invention is to display the maximum point flow velocity waveform VM. This VM is roughly divided from the body surface, for example, 1.
The figure shows the velocity of the point with the highest blood flow velocity among 50 measurement points spaced at 0.5 M intervals up to a depth of 5 m.

Next, the operation of the present invention will be explained based on FIG.

An electric signal of 20 MHz (fl) is oscillated from the carrier oscillator 9. This electrical signal is outputted from the transmission amplifier 7 under the control of the transmission timing control section 8 and transmitted to the ultrasound probe 1, whereby the ultrasound probe 1 outputs 20 MHz ultrasound.

When this ultrasonic probe 1 touches the surface of the human body with the measurement light, reflected waves from a large number of measurement points are received by the ultrasonic probe 1 as described above, and this reception signal f1fi (f
z is a change corresponding to the Doppler effect due to blood flow) is sent from the receiving amplifier 2 to the real part mixer 5 and the imaginary part mixer 4, respectively.

The electric signal fl output from the carrier oscillation section 9 is input to the real Toden mixer 3, and the imaginary section mixer 4
The electric signal of f8 delayed by 90 degrees by the 90 degree delay circuit 5 is input to the respective outputs of the receiving amplifier 2 (fl
fz) is performed.

The multiplication outputs from the real part mixer 4 and the imaginary part mixer 4 are added and demodulated by the complex direction detection circuit 6, so that the above f is obtained from the complex direction detection circuit 6. As is well known, this fz is a value that corresponds to the velocity of blood flow, so this value is outputted from the complex direction detection circuit 6 as digital data as the velocity of blood flow.

Of course, this blood flow velocity is 50 for each o, syttx above.
This data is output as data for each measurement point.

Blood flow velocity data for each of these measurement points is transmitted to the shift register 11. At this time, the shift register 11 is configured to hold approximately 2 seconds of speed data for each measurement point. Although there are individual differences in the number of heartbeats, most people have a heartbeat at least once every 42 seconds, and the shift register 11 stores data based on the presence of this pulse, so it is possible to correctly determine the point of maximum blood flow velocity. Depends on what you can do. The data at each measurement point is input to the shift register 11 and accumulated by the accumulator 12, and the output from the shift register 11 is subtracted from the accumulated value of the accumulator 12. As a result, the accumulated value line shift register 11 in the accumulator 12
It always shows the integrated value of the measured values for the past two seconds. This calculation result is transmitted to the maximum point search circuit 13, and the maximum point among these measurement points is detected, and this is transmitted to the data selector 10. Thereby, the data selector 10 outputs the instantaneous value of the blood flow velocity at the measurement point designated as the maximum point, which is transmitted to the display output control section 14 and displayed on the display output section 16 as the maximum point flow velocity waveform VM. become.

Since the screen of the display output unit 16 is scanned every 55.6 msec, the maximum point search circuit 13 also performs a maximum point search every 33.5 msec based on the data of the previous 2 seconds to find the maximum blood flow velocity. The point is detected and the data selector 10 displays the current blood flow velocity at the detected measurement point as the VM.

The blood flow velocity of the data selector 10 is also transmitted to the D/A converter 17 and converted into an analog signal of an audio frequency corresponding to the velocity, for example. This analog signal is amplified by an audio amplifier 18, and an audio output section 19 outputs a sound with a frequency corresponding to this speed. Therefore,
A doctor can determine the speed of blood flow based on the sound from this audio output section 19.

Of course, in addition to the output of the data selector 10, the output of the complex direction detection circuit B is input to the display output control section 14.
The output display section 16 can display 11 pieces of data as shown in FIG.

According to the present invention, the doctor does not have to manually search for the sample measurement point where the maximum blood flow velocity exists in the measured blood flow velocity data, and can focus both hands and eyes on the patient in one diagnosis. It is possible to reduce labor, shorten measurement time, improve reliability and reproducibility of measurement positions, and reduce individual differences in measurement.

〔Effect of the invention〕

According to the present invention, the @teacher does not need to manually search for the maximum blood flow velocity point and can concentrate on 9 diagnoses, reducing labor, shortening measurement time, improving reliability and reproducibility, and measuring individual differences. It has excellent effects such as a reduction in

[Brief explanation of the drawing]

FIG. 1 shows an example of a display suitable for the present invention. FIG. 2 is a configuration diagram of an embodiment of the present invention. In the figure, 1 is an ultrasonic glove and 2 is a receiving amplifier. 3 is the real part mixer, 4 is the imaginary part mixer. 5 is a 90 degree delay circuit, 6 is a complex direction detection circuit, 7 is a transmission amplifier, 8 is a transmission timing control section, 9 is a carrier oscillation section, 10 is a data selector, 11 is a shift register, 1
2 is an accumulator, 13 is a maximum point search circuit, 14 is a display output control section, 15 is a bit plane memory, 16 is a display output section, 17 is a D/A converter, and 1B is an audio amplifier. 19 indicates an audio output section. Patent applicant Fujitsu Ltd. Representative Patent Attorney Akira Yamatani

Claims (1)

[Scope of Claim] A Doppler blood flow meter capable of simultaneously measuring flow velocities at a plurality of sample points, comprising maximum point search means for automatically tracking the point of maximum absolute value of blood flow velocity in measurement data. A data selection means controlled by the maximum point search means, a display means for visually displaying the output of the data selection means, or a Doppler sound by outputting the output of the data selection means as an audio signal corresponding to the blood flow velocity. A Doppler blood flow meter output method characterized by comprising an audible sound generating means.