WO2006062042A1 - 超音波観測装置 - Google Patents
超音波観測装置 Download PDFInfo
- Publication number
- WO2006062042A1 WO2006062042A1 PCT/JP2005/022198 JP2005022198W WO2006062042A1 WO 2006062042 A1 WO2006062042 A1 WO 2006062042A1 JP 2005022198 W JP2005022198 W JP 2005022198W WO 2006062042 A1 WO2006062042 A1 WO 2006062042A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- circuit
- ultrasonic
- observation apparatus
- timing
- signal
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
- G01S7/52017—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00 particularly adapted to short-range imaging
- G01S7/52023—Details of receivers
- G01S7/52025—Details of receivers for pulse systems
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/12—Diagnosis using ultrasonic, sonic or infrasonic waves in body cavities or body tracts, e.g. by using catheters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/0207—Driving circuits
- B06B1/0215—Driving circuits for generating pulses, e.g. bursts of oscillations, envelopes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/88—Sonar systems specially adapted for specific applications
- G01S15/89—Sonar systems specially adapted for specific applications for mapping or imaging
- G01S15/8906—Short-range imaging systems; Acoustic microscope systems using pulse-echo techniques
- G01S15/8934—Short-range imaging systems; Acoustic microscope systems using pulse-echo techniques using a dynamic transducer configuration
- G01S15/8938—Short-range imaging systems; Acoustic microscope systems using pulse-echo techniques using a dynamic transducer configuration using transducers mounted for mechanical movement in two dimensions
- G01S15/894—Short-range imaging systems; Acoustic microscope systems using pulse-echo techniques using a dynamic transducer configuration using transducers mounted for mechanical movement in two dimensions by rotation about a single axis
Definitions
- the present invention relates to an ultrasonic observation apparatus that generates a transmission pulse suitable for exciting an ultrasonic transducer.
- an ultrasonic observation apparatus is connected to an ultrasonic endoscope or an ultrasonic probe and used for the depth of a lesion, substantial diagnosis of an organ, and the like.
- An ultrasonic transducer is built in the tip of the ultrasonic endoscope or ultrasonic probe. By applying an electrical drive pulse transmitted from the ultrasonic observation device to the ultrasonic transducer, this ultrasonic transducer is installed. It is converted into an acoustic ultrasonic pulse by the ultrasonic transducer and irradiated to the body tissue.
- this ultrasonic vibrator uses a PZT (two-component piezoelectric ceramic Pb (Ti, Zr) 03) vibrator or a composite piezoelectric element, and a driving method suitable for the ultrasonic vibrator has been adopted. .
- PZT two-component piezoelectric ceramic Pb (Ti, Zr) 03
- the conventional PZT resonator has a specific bandwidth of about 70%.
- about three waves of no-les having a time width of the center frequency are used.
- the above-described composite piezoelectric element has a very wide relative bandwidth with respect to the conventional PZT vibrator and has 100% or more.
- the frequency band of the transmission pulse in which the frequency bandwidth of the composite piezoelectric element is wider than the frequency bandwidth of the transmission noise has become highly dependent on the ultrasonic image.
- THI tissue Harmonic Imaging
- the harmonic signal generated in the body and extracted and imaged is called THI.
- the ultrasonic observation apparatus has problems specific to medical devices.
- Ultrasound endoscopes or ultrasound probes must be inserted into the human body, and in order to ensure safety to humans from that perspective, standards for electrical safety such as leakage current and withstand voltage are required. It is necessary to satisfy.
- an ultrasonic endoscope or ultrasonic probe is electrically connected to a circuit, for example, a transmission circuit portion. It was necessary to form a patient circuit that floats from the primary circuit (commercial power supply) of the observation device and the secondary circuit (including the device housing) that operates the inside of the device.
- the ultrasonic observation apparatus needs to suppress the amount of noise (radiated electromagnetic field noise) radiated outside the apparatus to a specified value or less while providing the patient circuit.
- noise radiated electromagnetic field noise
- the radiated electromagnetic field noise is a regulation for preventing a device used in a medical institution from adversely affecting, for example, pacemaker power.
- FIG. 7 is a timing chart showing a process in which a transmission waveform is created.
- An ultrasonic endoscope is provided with a single ultrasonic transducer at the distal end of the endoscope.
- the ultrasonic transducer is rotated around the axis of the endoscope insertion portion by rotating rotational driving power, and the ultrasonic scanning is performed by this rotational scanning.
- a synchronization signal (A-phase trigger) is transmitted from the ultrasonic endoscope to the ultrasonic observation apparatus in synchronization with the rotation of the ultrasonic transducer.
- the A-phase trigger generates, for example, 512 pulses while the ultrasonic transducer rotates once in the radial direction.
- the ultrasonic observation device applies a transmission signal (transmission pulse) synchronized with 512 pulses to the ultrasonic vibrator, acquires a reception echo at that time, and generates one image.
- a transmission signal transmission pulse
- the transmission pulse of two burst waves is output using the A phase trigger as a synchronization signal.
- FIG. 7 shows a process for outputting two burst waves.
- a pulse with a fixed pulse width is generated using the A-phase trigger in Fig. 7 as a synchronization signal.
- the created pulses are sequentially delayed as shown in FIG. 7 by delay elements (hereinafter simply referred to as “delays”) D1 to D8 having eight delay lines.
- the first wave of the composite pulse P1 is generated by the delays Dl and D2.
- Delay D5 and D6 generate the second wave of composite pulse P1.
- One wave day of composite pulse P2 is generated by delays D3 and D4.
- Delay D7 and D8 generate the second wave of composite pulse P2.
- the transmission pulse output of two burst waves can be obtained.
- a burst wave output is obtained from synthesized pulses PI and P2
- a switched waveform is synthesized by a field effect transistor (FET) using a transformer.
- the output amplitude of this burst wave is about 200Vp_p.
- a programmable delay line is used to feed back the delayed pulse to the input side and delay again.
- This technique is certainly effective in reducing the delay line.
- the above circuit was capable of handling only the generation of relatively slow pulses. For example, when creating a 4-wave burst with a half-wavelength of 16 ns (about 30 MHz), assume that eight programmer delay lines are used.
- Holding the output pulse with the timing controller, reading the delay data from the delay data generator, and setting the data in the programmable delay line is difficult at the current device operation speed.
- FPGA Field Programmable Gate Array
- the timing of this pulse width adjustment is a level of 1 to several ns, and the master clock of the FPGA needs to be about 1 GHz to 300 MHz.
- the present invention has been made in view of the above-described problems, and has a waveform corresponding to the characteristics of the ultrasonic transducer and the like, can reduce the generation of radiated electromagnetic noise, and can reduce the force cost.
- An object of the present invention is to provide an ultrasonic observation apparatus capable of generating a transmission signal to be transmitted.
- the present invention is an ultrasonic observation apparatus that is connected to an ultrasonic probe that is inserted into a body cavity, and that outputs a pulsed transmission signal to an ultrasonic transducer built in the ultrasonic probe.
- a timing generation circuit provided in the secondary circuit for generating a timing signal for generating the transmission signal
- An insulating circuit that insulates the timing signal from the secondary circuit and transmits it to the patient circuit, and a transmission signal generator that is provided in the patient circuit and generates the transmission signal in synchronization with the input timing signal Circuit,
- a timing generation circuit that handles high-speed timing signals is provided in a secondary circuit whose ground is connected to the casing of the ultrasonic observation apparatus, and the ground of the secondary circuit is included in the casing. By being connected, the generation of noise in the secondary circuit is suppressed.
- a transmission signal generation circuit for generating a transmission signal is provided in the patient circuit, and the timing signal generated in the secondary circuit is transmitted through the insulation circuit, thereby suppressing the current value required in the patient circuit.
- electromagnetic radiation noise is suppressed and the size of the patient circuit is reduced, so that the ultrasonic observation apparatus can be reduced in size and cost.
- FIG. 1 is a configuration diagram showing the overall configuration of an ultrasonic diagnostic apparatus provided with Embodiment 1 of the present invention.
- FIG. 2 is a timing chart showing the operation of the first embodiment.
- FIG. 3 is a configuration diagram showing the overall configuration of an ultrasonic diagnostic apparatus provided with Embodiment 2 of the present invention.
- FIG. 4 is a timing chart showing the operation of the second embodiment.
- FIG. 5 is a configuration diagram showing the overall configuration of an ultrasonic diagnostic apparatus including Example 3 of the present invention.
- FIG. 6 is a timing chart showing the operation of the third embodiment.
- FIG. 7 is a timing chart showing a process of creating a transmission waveform in the preceding example.
- FIG. 1 shows an ultrasonic diagnostic apparatus including Example 1 of the present invention.
- An ultrasonic diagnostic apparatus 1 including the first embodiment of the present invention shown in FIG. 1 includes an ultrasonic endoscope (abbreviated as an ultrasonic scope) 2 inserted into a body cavity, and the ultrasonic scope 2 is detachable.
- the drive pulse (or transmission pulse) that is connected and drives the ultrasonic transducer 3 built in the ultrasonic scope 2 is generated, and the signal processing is performed on the received ultrasonic signal.
- a sonic endoscope observation apparatus (hereinafter simply referred to as an observation apparatus) 4 and a monitor 5 for displaying a video signal generated by the observation apparatus 4 are provided.
- the ultrasonic scope 2 has an elongated insertion part 6 to be inserted into a body cavity, and an ultrasonic transducer 3 for transmitting and receiving ultrasonic waves is disposed at a distal end part 7 of the insertion part 6.
- the distal end portion 7 is provided with illumination means and an observation optical system (not shown) so that optical observation can be performed.
- Figure 1 shows only the ultrasonic probe part.
- the ultrasonic transducer 3 disposed in the distal end portion 7 is attached to the distal end of the flexible shaft 8 passed through the insertion portion 6.
- the rear end of the flexible shaft 8 is connected to a rotation drive unit 11 provided in a grip 9 provided at the rear end of the insertion portion 6.
- the rotation drive unit 11 includes a motor (not shown), and the rotation force is transmitted to the ultrasonic transducer 3 through the flexible shaft 8 by the rotation of the motor.
- the ultrasonic transducer 3 is rotated along with the rotation of the motor. Rotates.
- the ultrasonic transducer 3 is connected to the rotor side contact of the slip ring 13 in the grip 9 via, for example, a coaxial cable 12a inserted into the flexible shaft 8, and this rotor side contact is the stator of the slip ring. Connected via coaxial cable 12b connected to side contact Connected to the contact of This connector 14 is detachably connected to the observation device 4.
- a position detection unit 15 that detects the rotation angle of a rotary coder or the like or detects the position of the rotation amount is provided, for example, on the rotation shaft of the motor of the rotation drive unit 11 in the grip unit 9.
- the connector 14 is provided with a scope detection unit 16 for detecting frequency information of the ultrasonic transducers 3 incorporated in each ultrasonic scope 2 and writing timing information for imaging.
- the scope detection unit 16 may generate an identification signal or store an identification signal according to each scope, or may be one in which an identification resistor is connected to a contact pin of a connector. Then, by connecting the connector 14 to the observation device 4, the ultrasonic transducer 3 is connected to the ultrasonic pulse generation unit 17 and the ultrasonic image generation unit 18 in the observation device 4, and the rotation drive unit 11, The position detection unit 15 and the scope detection unit 16 are connected to a first controller 19 in the observation device 4.
- the ultrasonic transducer 3 of the ultrasonic scope 2 is connected to a transmission circuit 22 and a preamplifier 23 as a transmission signal generation circuit via a branch unit 20 belonging to the patient circuit 21 in the observation apparatus 4.
- the transmission circuit 22 includes a pulsed transmission signal that drives the ultrasonic transducer 3, that is, a pulse generation circuit 24 that generates a transmission pulse, a pulse driver 25 that drives the pulse generation circuit 24, and a secondary circuit described later.
- a first isolation circuit 27a that insulates and transmits the timing signal from 26.
- the first insulation circuit 27 a is connected to an insulation circuit driver 28 belonging to the secondary circuit 26, and the insulation circuit driver 28 is connected to a timing generation circuit 29 belonging to the secondary circuit 26.
- the timing generation circuit 29 is connected to the memory 30 and the second controller 31.
- the first controller 19 is connected to the second controller 31 via a second insulation circuit 27b that insulates and transmits the output signal.
- the preamplifier 23 that amplifies the echo signal received by the ultrasonic transducer 3 is connected to the ultrasonic image generation circuit 32 belonging to the secondary circuit 26 via a third insulation circuit 27c that insulates and transmits the signal.
- the ultrasonic image generated by the ultrasonic image generation circuit 32 The image signal is output to the monitor 5, and an ultrasonic tomographic image is displayed on the display surface of the monitor 5.
- Each circuit belonging to the patient circuit 21 and each circuit belonging to the secondary circuit 26 are supplied with power from the power supply circuit 33, that is, patient circuit power and secondary circuit power.
- the metal device housing 34 of the observation device 4 is directly connected to the ground (abbreviated as GND) of the secondary circuit 26, whereas the GND of the patient circuit 21 has a high withstand voltage. It is connected to the device casing 34 via a capacitor 36.
- GND ground
- the GND of the patient circuit 21 is insulated (floating) in a direct current (DC) manner with respect to the device housing 34, and becomes conductive with a small impedance at a high frequency with a frequency sufficiently higher than the alternating current of the commercial power supply. It is in a close state.
- the device casing 34 is connected to the ground (earth).
- the timing generation circuit 29 generates a high-speed timing signal necessary for generating a transmission pulse, and outputs it to the first insulation circuit 27a via the insulation circuit driver 28. As will be described later, the timing generation circuit 29 generates a pair of positive and negative pulses as a timing signal corresponding to the generation of the bipolar pulse by the pulse generation circuit 24 to generate two systems of insulating circuit drivers. Output to the first insulation circuit 27a via 28.
- the two systems of the insulating circuit driver 28 include a resistor 41a, a buffer 42a, a resistor 43a, a resistor 41b, a buffer 42b, and a resistor 43b.
- the output signals of the buffers 42a and 42b are output to the pulse driver 25 through the pulse transformers 44a and 44b constituting the first insulating circuit 27a.
- This pulse driver 25 is also provided in two systems, and is composed of a resistor 45a, a capacitor 46a, a resistor 47a, a buffer 48a, a resistor 45b, a capacitor 46b, a resistor 47b, and a buffer 48b. Output signals from the buffers 48a and 48b of the pulse driver 25 are output to the pulse generation circuit 24.
- This pulse generation circuit 24 includes a power FET 49a that switches the power supply voltage Vcc from ON to OFF with a positive output pulse (positive pulse) and a power supply voltage + Vcc with a negative output pulse (negative pulse).
- Power FET 49b that switches from OFF to ON, and transformer 50 composed of a pulse transformer, etc., to which the output signals of these two power FETs 49a and 49b are applied to the primary power line, respectively.
- a pair of pulses is generated as a timing signal that is necessary for generating a transmission pulse in the secondary circuit 26 and increases current consumption. Then, the signal is transmitted to the pulse driver 25 side provided in the patient circuit 21 through the insulating circuit 27a. Furthermore, the pulse generator circuit 24 is configured to generate positive and negative transmission pulses, reducing the circuit configuration scale of the patient circuit 21 and reducing the current consumption, effectively generating noise (radiated electromagnetic field noise).
- the special teaching is that it has a structure that can be easily controlled.
- the ultrasonic transducer 3 built in the ultrasonic scope 2 transmits and receives ultrasonic waves.
- the transmission frequency of the frequency and the number of pulses appropriately corresponding to the frequency characteristics to be performed can be easily generated (in contrast, the previous example uses a delay line to measure the number of pulses). Etc.).
- the frequency detection and imaging of the ultrasonic transducer 3 in the connected ultrasonic scope 2 is performed by the scope detection unit 16 built in the ultrasonic scope 2. It is possible to detect information such as the write timing information at the time of reading.
- the first controller 19 connected to the scope detector 16 transmits the above information to the second controller 31 via the insulation circuit 27b.
- the second controller 31 instructs the timing generation circuit 29 to specify the address of the memory 30 that stores the waveform generation data for generating the transmission node that drives the ultrasonic transducer 3.
- the start switch (freeze release signal) is input to the first controller 19 by operating a console (not shown) or the scope switch of the ultrasonic scope 2
- the first controller 19 A drive signal is sent to the motor in the rotation drive unit 11, and the motor rotates. With this rotation of the motor, the ultrasonic transducer 3 in the ultrasonic scope 2 starts rotating as shown by the arrow in FIG.
- position information (A phase and Z phase signals) of the ultrasonic transducer 3 is obtained by the position detector 15 provided in the ultrasonic scope 2.
- the A-phase signal and the Z-phase signal that is the reference pulse that is output once per rotation are input to the first controller 19, and after waveform shaping, are input to the second controller 31 through the insulation circuit 27 b. .
- the A phase and Z phase signals are transmitted to the timing generation circuit 29 by the second controller 31 and simultaneously transmitted as timing signals to the ultrasonic image generation circuit 32.
- the ultrasonic image generation circuit 32 performs image processing for generating an ultrasonic tomographic image from the echo signal in synchronization with this timing signal.
- the timing generation circuit 29 the basic pulse of the transmission pulse waveform before synthesis is used as the timing signal for generating the transmission pulse to be transmitted to the pulse generation circuit 24 by the information from the scope detection unit 16 and the A phase signal. (Core pulse) is generated.
- the timing generation circuit 29 is basically composed of a field 'programmable gate array (abbreviated as FPGA). This FPGA uses a synchronous clock with a frequency of about 320 MHz.
- the basic resolution time resolution as the timing pulse generated from the pulse generation circuit 24 can be reduced to about 3 ns.
- the core voltage consumed inside the FPGA and the current consumption of the IO power used by the external interface increase.
- both the core power and IO power consumed by the FPGA are class 2A.
- the current consumption is about 100mA, whereas in the case of FPGA, the current consumption is about 40 times.
- the timing signal generated by the timing generation circuit 29 is transmitted to the insulation circuit driver 28.
- the timing signal passes through each buffer 42a and 42b of the isolation circuit driver 28, and then the next stage isolation. Applied to the primary winding side of each pulse transformer 44a, 44b of the circuit 27a, and the signal is transmitted to the secondary winding belonging to the patient circuit 21 isolated from the secondary circuit 26 on the primary winding side. , Output to the driver 25.
- the output signal of the insulation circuit driver 28 is a high frequency signal having a frequency of several MHz, and is transmitted to the pulse driver 25 through the pulse transformers 44a and 44b.
- the pulse transformers 44a and 44b insulate the insulating circuit driver 28 on the secondary circuit 26 side from the pulse driver 25 belonging to the patient circuit 21.
- the DC withstand voltage between the secondary circuit 26 and the patient circuit 21 by the pulse transformers 44a, 44b, etc. is about 4000V, and the transmission circuit 22 belonging to the patient circuit 21 is floating from the secondary circuit 26.
- the pulse driver 25 amplifies and shapes the transmitted pulse signal, and outputs it to the pulse generation circuit 24 from the output terminals of the buffers 48a and 48b.
- the pulse generation circuit 24 includes a positive drive FET 49a, a negative drive FET 49b, and a transformer 50.
- the pulse generation circuit 24 is applied to the primary winding of the output balance 50 of both FETs 49a and 49b in a relatively opposite phase.
- the next winding is synthesized to have a bipolar output.
- the bipolar transmission pulse synthesized by the transformer 50 is transmitted through the ultrasonic vibrator 3 accommodated in the distal end portion 7 of the insertion portion 6 through the coaxial cable 12a in the ultrasonic scope 2 described above. Will be driven.
- the transmission circuit 22 belonging to the patient circuit 21 is connected to GND by a device housing 34 and a high-voltage capacitor 36, and is set to a state close to the same potential as the device housing 34 in terms of high frequency.
- the operation of the timing generation circuit 29, the memory 30, etc. will be described in detail with reference to FIG.
- the A phase signal is detected by the position detector 15 of the ultrasonic scope 2. This A-phase signal is shaped and transmitted to the timing generation circuit 29 as an A-phase trigger shown in FIG.
- the timing generation circuit 29 is composed of, for example, an FPGA, and a clock when the FPGA operates is shown in FIG. 2B, and its frequency is about 320 MHz.
- the timing generation circuit 29 stores the positive polarity memory data for waveform generation and the negative polarity memory data from the memory 30 in the memories M 1 and M 2 in the FPGA based on the signal from the scope detection unit 16. . Then, the timing generation circuit 29, as shown in FIG. 2 (C) and FIG. 2 (D), stores the memory data stored in the memory Ml and the memory M2, respectively, for the positive and negative pulses for generating the transmission noise.
- the negative pulse is sequentially output as a pair of pulses to the buffers 42a and 42b of the insulation circuit driver 28 with a short time difference at a predetermined timing from the A phase trigger.
- the pulse signals output to the buffers 42a and 42b are transmitted to the subsequent stage in two systems (for transmission pulse generation) and applied to the FETs 49a and 49b of the pulse generation circuit 24.
- the transformer 50 force of the pulse generation circuit 24 generates a bipolar waveform transmission pulse as shown in FIG. 2E, and the ultrasonic transducer 3 is driven by this transmission pulse.
- the timing generation circuit 29 generates the next positive pulse and negative pulse at the predetermined timing of the A-phase trigger force.
- the pulses for negative and negative pulses generate the next transmission pulse in the pulse generation circuit 24.
- the ultrasonic vibrator 3 transmits ultrasonic waves in a radial manner while the insertion shaft is rotated by performing ultrasonic vibration (ultrasonic excitation) for a short time in a pulse-like manner by applying a transmission pulse, and performs radial running.
- the ultrasonic wave is transmitted to the inner side of the wall surface in the body cavity where the distal end portion 7 is in contact, reflected at the portion where the acoustic impedance is changed, and the reflected ultrasonic wave is received by the ultrasonic transducer 3. And converted into an electrical signal to become an ultrasonic echo signal (echo signal)
- This echo signal is switched immediately after transmission of a transmission pulse to be transmitted radially.
- the echo signal is input from the branch unit 20 to the preamplifier 23, amplified, and then passed through the insulation circuit 27c to generate an ultrasonic image belonging to the second path 26. Input to circuit 32.
- the ultrasonic image generation circuit 32 includes an AZD conversion circuit and a memory, A / D converts each echo signal when it is transmitted radially, and stores the echo data in the memory. Then, for example, echo data for one frame from a radial raft that has been rotated once is subjected to a conversion process for display on the monitor 5 by a digital scan converter (DSC). Is displayed.
- DSC digital scan converter
- the data in memory 30 was connected by setting it to the desired value.
- a pulse waveform and a pulse length with an optimum frequency can be output to the ultrasonic transducer 3.
- the timing generation circuit 29 operates with a very fast clock and the current consumption increases.
- the timing generation circuit 29 is provided in the secondary circuit 26, and its GND is connected to the device housing 34 of the observation device 4. Therefore, radiated electromagnetic field noise can be made extremely small.
- this embodiment has the following effects.
- the configuration scale of the patient circuit can be reduced, and the size of the observation apparatus body can be reduced. Become.
- FIG. 1 shows the overall configuration of an ultrasonic diagnostic apparatus 1 equipped with Example 2.
- the ultrasonic diagnostic apparatus 1 shown in FIG. 3 is the same as the ultrasonic diagnostic apparatus 1 shown in FIG. 1 except that the pulse driver 25 constituting the transmission circuit 22 adjusts the timing of the positive pulse and the negative pulse (depending on the delay time).
- An adjustment circuit 51 is provided.
- the other end of the capacitor 46a connected in series to one end of the secondary winding of the pulse transformer 44a is grounded via a resistor 52a and buffered via a variable delay 53a with a variable delay amount. Connected to 48a input.
- the other end of the capacitor 46b connected in series to one end of the secondary winding of the pulse transformer 44b is grounded via the resistor 52b, and the input of the buffer 48b via the variable delay 53b with variable delay amount. Connected to the end.
- the timing adjustment circuit 51 may be provided between the force insulation circuit 27 a and the pulse driver 25, which is shown in the configuration in which the timing adjustment circuit 51 is provided in the pulse driver 25.
- the path from the timing generation circuit 29 to the pulse generation circuit 24 is adapted to cope with the case where the delay amount of the positive and negative pulses is different. .
- the delay amount between the positive pulse and the negative pulse is different from FIG. 4 (C) to FIG. 4 (E), and an unintended transmission pulse (output) cannot be obtained.
- an appropriate transmission noise can be obtained as shown in FIG. 4).
- the timing generation circuit 29 composed of the FPGA is synchronized with the clock in FIG. 4 (B) using the A phase trigger in FIG. Read memory data and memory data for negative electrode and store them in memory Ml and M2 in FPGA. Then, using the A-phase trigger as a synchronization signal, it reads out from the memories Ml and M2 at a predetermined timing as shown in FIGS. Output negative pulse.
- the insulating circuit driver 28 applies the positive pulse and the negative pulse to the pulse driver 25 through the insulating circuit 27a, and the pulse driver 25 transmits the transmitted positive pulse and negative pulse. It is transmitted to the pulse generation circuit 24.
- the timing of the positive pulse and the negative pulse may be shifted due to the influence of the path from the force generation circuit 29 to the pulse generation circuit 24 where the output of the transmission pulse is generated by the noise generation circuit 24. . If there is a difference in the delay amount in the propagation path between the two systems so that the delay amount of the positive pulse is large and the negative pulse delay amount is small, the output of the waveform shown in Fig. 4 (E) (transmission pulse) ) And the intended waveform cannot be obtained.
- the delay amount of the positive and negative pulses is adjusted by the timing adjustment circuit 51 so that the transmission pulse as the output of the pulse generation circuit 24 has the waveform shown in FIG.
- the positive pulse is delayed by dl by a variable delay 53a as shown in Fig. 4 (H)
- the negative pulse is delayed by a variable delay 53b as shown in Fig. 4 (1).
- delaying by d2 it is possible to obtain a transmission pulse having a desired waveform.
- the timing generation circuit 29 with large current consumption is provided in the secondary circuit 26, and the propagation delay until the propagation from the timing generation circuit 29 to the patient circuit 21 is different between the two systems. Even so, the timing adjustment circuit 51 can appropriately correct the difference in propagation delay.
- the timing adjustment circuit 51 does not require a large delay amount, and thus can be realized with a very small circuit.
- the power consumption is hardly changed, the radiation electromagnetic field noise is not increased.
- the case where the delay amount of the positive pulse and the negative pulse is different in the path from the timing generation circuit 29 to the pulse generation circuit 24 is also supported. It has an effect that can be done.
- FIG. 5 shows an overall configuration of an ultrasonic diagnostic apparatus including the third embodiment.
- This ultrasonic diagnostic apparatus 1 is the same as the ultrasonic diagnostic apparatus 1 of the first embodiment, and the timing generation circuit 29 generates two timing signals as in the first embodiment.
- a DAC circuit 61 is connected to convert the digital signal into an analog signal, that is, D / A conversion.
- the output signal of the DAC circuit 61 is input to the isolation circuit driver 28 together with the second system side signal output from the timing generation circuit 29.
- the amplifier 62 is connected to the output terminal on the first system side in the insulation circuit 27a, for example, via the capacitor 46a.
- the output terminal of the amplifier 62 is connected to the matching resistor 63, and is connected to the ultrasonic transducer 3 of the ultrasonic scope 2 via the branch unit 20, and the transmission output from the amplifier 62 is performed.
- the ultrasonic transducer 3 is driven by the noise.
- the other output signal of the timing generation circuit 29 is input to the bias circuit 64 provided in the patient circuit 21 via the isolation circuit driver 28 and the isolation circuit 27a.
- the bias circuit 64 is configured using, for example, a buffer circuit 65, and an output signal of the bias circuit 64 is connected to a bias terminal that controls the amplification operation of the amplifier 62.
- the bias circuit 64 normally applies an “L” level signal to the bias terminal so that the amplifier 62 does not perform an amplification operation. During the period in which the transmission signal is generated, the bias circuit 64 generates a noise signal.
- the terminal is set to a state where an “H '” level signal is applied to the terminal for amplification operation, that is, the other output signal (second signal) output from the timing generation circuit 29 constitutes the transmission circuit 22.
- the control signal controls the operation of the amplifier 62.
- the ultrasonic transducer 3 has less harmonic components and a waveform transmission pulse.
- Transmission signal can be generated. Therefore, the timing generation circuit 29 In this system, a signal having a transmission pulse waveform is sent to the transmission circuit 22 side, and in the other system, a control signal for operating the amplifier 62 of the transmission circuit 22 is transmitted during a period in which the transmission pulse is generated. .
- the power supply circuit 33 has a function of a positive / negative bipolar patient circuit power supply (in Examples 1 and 2, it has a function of only a positive (unipolar) patient circuit power supply). .
- the power supply circuit 33 has a function of outputting a positive / negative bipolar signal even through a secondary circuit power supply (in Examples 1 and 2, it has a function of only a positive (single polarity) secondary circuit power supply. ).
- the transmission pulse is obtained by synchronizing with the A-phase trigger.
- 6A shows a phase A trigger
- the timing generation circuit 29 is composed of an FPGA operating with a clock of about 320 MHz shown in FIG.
- This FPGA reads the memory data stored in the memory 30.
- the force S was 1-bit data content, and in this embodiment, for example, 8-bit data content is used.
- the memory data once read from the memory 30 is output in 8 bits in synchronization with the clock after a predetermined time has elapsed since the A phase trigger.
- the 8-bit memory data output from the FPGA can be generated in an arbitrary waveform by the DAC circuit 61 as shown in the DAC output of FIG.
- the FPGA (timing generation circuit 29) generates a bias circuit output as a control signal (of the amplifier 62) output to the bias circuit 64 as shown in FIG. 6D as the other output.
- the data is read from the memory 30 and is generated by the timing generation circuit 29.
- the DAC output and the bias circuit output are applied to the amplifier 62 in the patient circuit 21 via the isolation circuit driver 28 and the isolation circuit 27a.
- this amplifier 62 is almost OFF when no bias circuit output (output level is zero or “L” level) is applied, and no amplification operation is performed.
- the bias circuit output shown in FIG. 6D is given from the bias circuit 64, a bias current flows through the amplifier 62, the amplifier 62 is enabled, and an amplification operation is performed.
- the DAC output shown in FIG. 6C is applied to the amplifier 62.
- the amplifier 62 linearly amplifies the signal input through the DAC circuit 61 to an amplitude of about 200 Vpp.
- the amplified transmission output is applied to the ultrasonic transducer 3 of the ultrasonic scope 2 as a transmission pulse, and ultrasonic waves are excited.
- the transmission pulse shown in FIG. 6 (E) is a drive signal applied to the ultrasonic transducer 3, and can be made a transmission waveform with its harmonics suppressed by several + dB with respect to the pulse waveform of the fundamental wave.
- the broadband ultrasonic transducer 3 even when the broadband ultrasonic transducer 3 is used, it is possible to greatly reduce the harmonic component of the transmission waveform.
- the harmonic component of the received signal returned from the subject can be efficiently received by the broadband transducer 3 to be used as an echo signal, which greatly improves the sensitivity for generating THI images. To do.
- processing for generating an ultrasonic image based on the fundamental wave is performed in the ultrasonic image generation circuit 32 on the echo signal received by the ultrasonic transducer 3.
- processing for generating an ultrasonic image based on the fundamental wave is performed in the ultrasonic image generation circuit 32 on the echo signal received by the ultrasonic transducer 3.
- the signal components of the second or third harmonics of the fundamental wave in the echo signal it is possible to obtain an ultrasound image that suppresses side lobes and has good azimuth resolution. You can also do it.
- the transmission circuit 22 can be configured with the minimum necessary power consumption by controlling the operation of the amplifier 62 by the bias circuit 64 to be OFF and OFF.
- the circuit scale can be reduced, and accordingly, the circuit scale of the observation apparatus 4 can be reduced and the size and cost can be reduced.
- the present embodiment has the effects of the first embodiment, and further has a pulse waveform (corresponding appropriately to the characteristics of the ultrasonic transducer 3 built in the ultrasonic scope 2 connected to the observation device 4 (In other words, it is possible to generate a transmission pulse having an arbitrarily close pulse waveform.
- the present embodiment makes it possible to suppress harmonics as the waveform of the transmission pulse, there is also an effect that it is possible to improve the sensitivity of THI.
- weighting can be performed with a window function such as Gaussian, which can contribute to suppression of side lobes and improvement of resolution.
- connection to the apparatus housing 34 may be turned off during a period during which transmission failure occurs, and may be set to 0 N during a period during which processing for the echo signal after the transmission pulse is output.
- the GND of the patient circuit 21 is conducted at high frequency by the impedance of the capacitor 36, and the GND of the patient circuit 21 is also connected by another capacitor. Conduct at high frequency. It is also possible to reduce the intrusion of external force noise during ultrasonic image generation during signal processing for echo signals, and to generate an ultrasonic image with good S / N.
- the generation of radiated electromagnetic noise that reduces the circuit scale can be reduced, and an arbitrary waveform suitable for driving an ultrasonic transducer (a waveform with fewer restrictions). )) A transmission signal can be generated.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05811349A EP1825816B1 (en) | 2004-12-06 | 2005-12-02 | Ultrasonic observation apparatus |
DE602005022227T DE602005022227D1 (de) | 2004-12-06 | 2005-12-02 | Ultraschallbeobachtungsgerät |
US11/810,084 US7905839B2 (en) | 2004-12-06 | 2007-06-04 | Ultrasonic observation apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-353426 | 2004-12-06 | ||
JP2004353426A JP4642450B2 (ja) | 2004-12-06 | 2004-12-06 | 超音波観測装置 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/810,084 Continuation US7905839B2 (en) | 2004-12-06 | 2007-06-04 | Ultrasonic observation apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006062042A1 true WO2006062042A1 (ja) | 2006-06-15 |
Family
ID=36577871
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/022198 WO2006062042A1 (ja) | 2004-12-06 | 2005-12-02 | 超音波観測装置 |
Country Status (5)
Country | Link |
---|---|
US (1) | US7905839B2 (ja) |
EP (1) | EP1825816B1 (ja) |
JP (1) | JP4642450B2 (ja) |
DE (1) | DE602005022227D1 (ja) |
WO (1) | WO2006062042A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008073137A (ja) * | 2006-09-20 | 2008-04-03 | Aloka Co Ltd | 超音波診断装置及び超音波プローブ |
JPWO2020245959A1 (ja) * | 2019-06-05 | 2020-12-10 |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5138249B2 (ja) * | 2007-03-26 | 2013-02-06 | 株式会社日立メディコ | 超音波診断装置 |
JP2008253524A (ja) * | 2007-04-04 | 2008-10-23 | Olympus Medical Systems Corp | 超音波観測システム |
US8864675B2 (en) | 2007-06-28 | 2014-10-21 | W. L. Gore & Associates, Inc. | Catheter |
WO2009006335A1 (en) * | 2007-06-28 | 2009-01-08 | Gore Enterprise Holdings, Inc. | Improved catheter |
US8852112B2 (en) | 2007-06-28 | 2014-10-07 | W. L. Gore & Associates, Inc. | Catheter with deflectable imaging device and bendable electrical conductor |
US20100238278A1 (en) * | 2009-01-27 | 2010-09-23 | Tokendo | Videoendoscopy system |
US9162255B1 (en) * | 2010-01-13 | 2015-10-20 | Fujifilm Sonosite, Inc. | Tunable ultrasound transmitter |
US9155140B2 (en) * | 2012-06-07 | 2015-10-06 | Gabriel Yavor | Optical waveform generator |
JP6272745B2 (ja) | 2014-10-27 | 2018-01-31 | ソニー・オリンパスメディカルソリューションズ株式会社 | 医療機器用基板および医療機器 |
JP6666367B2 (ja) * | 2018-01-04 | 2020-03-13 | ソニー・オリンパスメディカルソリューションズ株式会社 | 医療機器用基板および医療機器 |
JP2019150466A (ja) * | 2018-03-06 | 2019-09-12 | ソニー・オリンパスメディカルソリューションズ株式会社 | 医療機器 |
CN111867480A (zh) * | 2018-03-15 | 2020-10-30 | 皇家飞利浦有限公司 | 可变管腔内超声发射脉冲生成和控制设备、系统和方法 |
CN108553125B (zh) * | 2018-05-23 | 2024-01-26 | 深圳市德力凯医疗设备股份有限公司 | 一种超声经颅多普勒采集装置及系统 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61103436A (ja) * | 1984-10-26 | 1986-05-21 | オリンパス光学工業株式会社 | 超音波内視鏡装置 |
US4674515A (en) | 1984-10-26 | 1987-06-23 | Olympus Optical Co., Ltd. | Ultrasonic endoscope |
JPH11276484A (ja) * | 1998-03-26 | 1999-10-12 | Terumo Corp | 体腔内超音波診断装置 |
JP2000296128A (ja) * | 1999-04-16 | 2000-10-24 | Ge Yokogawa Medical Systems Ltd | 超音波発生装置制御方法、超音波発生装置および超音波撮像装置 |
JP2002315748A (ja) * | 2001-04-24 | 2002-10-29 | Matsushita Electric Ind Co Ltd | 超音波診断装置用送信回路 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1366879A (fr) * | 1963-06-04 | 1964-07-17 | Générateur d'ultra-sons | |
JPH0399644A (ja) * | 1989-09-14 | 1991-04-24 | Toshiba Corp | 超音波診断装置 |
US5209235A (en) * | 1991-09-13 | 1993-05-11 | Cardiovascular Imaging Systems, Inc. | Ultrasonic imaging catheter assembly and method for identification of the same |
US7343195B2 (en) * | 1999-05-18 | 2008-03-11 | Mediguide Ltd. | Method and apparatus for real time quantitative three-dimensional image reconstruction of a moving organ and intra-body navigation |
US6645148B2 (en) * | 2001-03-20 | 2003-11-11 | Vermon | Ultrasonic probe including pointing devices for remotely controlling functions of an associated imaging system |
JP2002315749A (ja) * | 2001-04-24 | 2002-10-29 | Olympus Optical Co Ltd | 超音波駆動回路 |
JP4216647B2 (ja) * | 2003-05-29 | 2009-01-28 | 古野電気株式会社 | 超音波送信装置、超音波送受信装置、および探知装置 |
-
2004
- 2004-12-06 JP JP2004353426A patent/JP4642450B2/ja not_active Expired - Fee Related
-
2005
- 2005-12-02 WO PCT/JP2005/022198 patent/WO2006062042A1/ja active Application Filing
- 2005-12-02 EP EP05811349A patent/EP1825816B1/en not_active Expired - Fee Related
- 2005-12-02 DE DE602005022227T patent/DE602005022227D1/de active Active
-
2007
- 2007-06-04 US US11/810,084 patent/US7905839B2/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61103436A (ja) * | 1984-10-26 | 1986-05-21 | オリンパス光学工業株式会社 | 超音波内視鏡装置 |
US4674515A (en) | 1984-10-26 | 1987-06-23 | Olympus Optical Co., Ltd. | Ultrasonic endoscope |
JPH11276484A (ja) * | 1998-03-26 | 1999-10-12 | Terumo Corp | 体腔内超音波診断装置 |
JP2000296128A (ja) * | 1999-04-16 | 2000-10-24 | Ge Yokogawa Medical Systems Ltd | 超音波発生装置制御方法、超音波発生装置および超音波撮像装置 |
JP2002315748A (ja) * | 2001-04-24 | 2002-10-29 | Matsushita Electric Ind Co Ltd | 超音波診断装置用送信回路 |
Non-Patent Citations (1)
Title |
---|
See also references of EP1825816A4 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008073137A (ja) * | 2006-09-20 | 2008-04-03 | Aloka Co Ltd | 超音波診断装置及び超音波プローブ |
JPWO2020245959A1 (ja) * | 2019-06-05 | 2020-12-10 | ||
JP7289352B2 (ja) | 2019-06-05 | 2023-06-09 | オリンパス株式会社 | 駆動装置 |
Also Published As
Publication number | Publication date |
---|---|
EP1825816A1 (en) | 2007-08-29 |
JP2006158598A (ja) | 2006-06-22 |
JP4642450B2 (ja) | 2011-03-02 |
DE602005022227D1 (de) | 2010-08-19 |
US7905839B2 (en) | 2011-03-15 |
US20080009744A1 (en) | 2008-01-10 |
EP1825816A4 (en) | 2009-01-21 |
EP1825816B1 (en) | 2010-07-07 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2006062042A1 (ja) | 超音波観測装置 | |
JP4917699B2 (ja) | 超音波診断装置 | |
JP5087722B2 (ja) | 超音波観測装置 | |
US7883466B2 (en) | Ultrasonic probe apparatus and ultrasonic diagnostic apparatus | |
JP2002530174A (ja) | コードレス走査ヘッド伝送システムを用いた超音波診断撮像 | |
JP2001516075A (ja) | 超音波フェーズドアレーの駆動方式および集束超音波ビーム発生および指向方式 | |
JPH09522A (ja) | 超音波プローブ及び超音波診断装置 | |
JP5459975B2 (ja) | 超音波診断装置 | |
US7115094B2 (en) | Ultrasonic probe, ultrasonic imaging apparatus and ultrasonic imaging method | |
JPH08628A (ja) | 超音波断層装置 | |
JP3730823B2 (ja) | 超音波振動子駆動回路 | |
JP4429701B2 (ja) | 超音波観測装置 | |
JP2849131B2 (ja) | 超音波診断医用カプセル | |
KR100413779B1 (ko) | 초음파 진단 장치 | |
JP2000023979A (ja) | 超音波診断装置 | |
JP2000005169A (ja) | 超音波送受信回路および超音波送受信回路を備えた超音波診断装置 | |
US20210204905A1 (en) | Ultrasound diagnostic apparatus and pulse signal transmitter | |
JP3062313B2 (ja) | 超音波診断装置 | |
JP2002315749A (ja) | 超音波駆動回路 | |
JP2001346798A (ja) | 超音波駆動回路 | |
JP2003290227A (ja) | 超音波診断装置及び超音波プローブ | |
JPS5911302B2 (ja) | 超音波映像装置およびその動作方法 | |
JP2004188171A (ja) | 超音波診断装置 | |
JP2005185566A (ja) | 超音波診断装置 | |
KR20090078624A (ko) | 단일 변환소자를 이용한 초음파 진단 장치 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS KE KG KM KN KP KR KZ LC LK LR LS LT LU LV LY MA MD MG MK MN MW MX MZ NA NG NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SM SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU LV MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 11810084 Country of ref document: US Ref document number: 2005811349 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWP | Wipo information: published in national office |
Ref document number: 2005811349 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 11810084 Country of ref document: US |