WO2016024449A1 - 光音響画像化装置 - Google Patents
光音響画像化装置 Download PDFInfo
- Publication number
- WO2016024449A1 WO2016024449A1 PCT/JP2015/069286 JP2015069286W WO2016024449A1 WO 2016024449 A1 WO2016024449 A1 WO 2016024449A1 JP 2015069286 W JP2015069286 W JP 2015069286W WO 2016024449 A1 WO2016024449 A1 WO 2016024449A1
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- Prior art keywords
- coaxial cable
- unit
- light emitting
- photoacoustic imaging
- imaging apparatus
- Prior art date
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/56—Details of data transmission or power supply
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0093—Detecting, measuring or recording by applying one single type of energy and measuring its conversion into another type of energy
- A61B5/0095—Detecting, measuring or recording by applying one single type of energy and measuring its conversion into another type of energy by applying light and detecting acoustic waves, i.e. photoacoustic measurements
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/13—Tomography
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/44—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device
- A61B8/4444—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device related to the probe
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2562/00—Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
- A61B2562/18—Shielding or protection of sensors from environmental influences, e.g. protection from mechanical damage
- A61B2562/182—Electrical shielding, e.g. using a Faraday cage
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2562/00—Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
- A61B2562/22—Arrangements of medical sensors with cables or leads; Connectors or couplings specifically adapted for medical sensors
- A61B2562/221—Arrangements of sensors with cables or leads, e.g. cable harnesses
- A61B2562/222—Electrical cables or leads therefor, e.g. coaxial cables or ribbon cables
Definitions
- the present invention relates to a photoacoustic imaging apparatus, and more particularly to a photoacoustic imaging apparatus provided with a probe including a detection unit.
- a photoacoustic imaging apparatus including a probe including a detection unit is known.
- Such a photoacoustic imaging apparatus is disclosed in, for example, Japanese Patent Laid-Open No. 2013-188330.
- JP 2013-188330 A discloses an object information acquisition apparatus provided with a probe including an ultrasonic probe.
- the subject information acquisition apparatus includes a light source, a probe including an emitting unit and an ultrasonic probe, and a processing device.
- the emitting unit is configured to guide the pulsed light from the light source disposed away from the emitting unit to the subject.
- the ultrasonic probe is configured to acquire an acoustic wave that is generated when pulse light is irradiated on the subject from the emission unit.
- the processing device is configured to image the acoustic wave acquired by the ultrasonic probe.
- an image forming apparatus including a connection cable is known.
- Such a photoacoustic imaging apparatus is disclosed in, for example, Japanese Patent Application Laid-Open No. 2008-44148.
- Japanese Patent Application Laid-Open No. 2008-44148 discloses an image forming apparatus provided with a connection cable.
- This image forming apparatus includes a print control unit, a connection cable, and an LED head.
- the print control unit and the LED head are connected by a connection cable.
- the LED head is provided with an input section resistance and a terminating resistance, and is configured to match the impedance of the LED head and the impedance (characteristic impedance) of the connection cable.
- it is comprised so that the reflected wave of the control signal from a printing control part resulting from the impedance of an LED head and the impedance of a connection cable being not matched may generate
- the probe is provided with a light source in order to reduce the loss of light amount when the light from the light source is irradiated (guided) to the subject.
- a light source in order to reduce the loss of light amount when the light from the light source is irradiated (guided) to the subject.
- a configuration in which the input unit resistance and the termination resistance described in JP 2008-44148 A are provided in the light source is conceivable.
- the input unit resistance and the termination resistance of Japanese Patent Application Laid-Open No. 2008-44148 are provided in the light source. It is considered that the responsiveness of the current flowing through the light source (light emitting element) decreases with respect to the pulsed power (pulse irradiation signal).
- the pulse irradiation signal is transmitted through the connection cable, electromagnetic waves or the like (noise) enter the inside from the outside (other devices, etc.) of the connection cable, and the pulse It is considered that the waveform of the irradiation signal is disturbed.
- the response of the current flowing through the light emitting element is the time from when the pulse irradiation signal (voltage) is applied to the light emitting element until the current value of the current flowing through the light emitting element reaches a substantially peak value. And the time from when the pulse irradiation signal is stopped to when the current value of the current flowing through the light emitting element becomes substantially zero.
- the present invention has been made in order to solve the above-described problems, and one object of the present invention is to suppress an electromagnetic wave from the outside while suppressing a decrease in responsiveness of a current flowing through the light emitting element.
- Photoacoustic imaging capable of suppressing the shortage of the amount of light irradiated from the light emitting element by suppressing intrusion of (noise) and suppressing radiation of electromagnetic waves from the inside to the outside Is to provide a device.
- a photoacoustic imaging apparatus includes a light emitting element capable of irradiating a subject with light, and light emitted from the light emitting element to the subject.
- a detection unit that detects an acoustic wave generated by absorption by a detection target inside the specimen, a power supply unit that supplies power to the light emitting element, a state in which the light emitting element emits light, and the light emitting element emits light
- a light source driving unit including a signal generation unit that generates a pulse irradiation signal for controlling a state of not performing the operation, and a coaxial cable that connects the light emitting element and the device main body unit
- the outer conductor of the coaxial cable is connected to the power source unit of the light source driving unit or grounded, and the inner conductor of the coaxial cable is connected to the signal generation unit of the light source driving unit.
- the coaxial cable is provided so as to connect the light emitting element and the apparatus main body, and the outer conductor of the coaxial cable is connected to the power source of the light source driving unit.
- the internal conductor of the coaxial cable is connected to the signal generation unit of the light source driving unit.
- the light source driving unit generates a pulsed signal of 10 A or more on the coaxial cable when generating a pulse irradiation signal for the light emitting element to irradiate light. It is comprised so that the electric current of may flow.
- a large current of 10 A or more is caused to flow by making it into a pulsed current.
- the flow of a pulsed current of 10 A or more to the above-described coaxial cable is not limited to the flow of a pulsed current of 10 A or more to one coaxial cable, and a case where a plurality of coaxial cables are provided.
- the total value of the current values flowing through the plurality of coaxial cables may be 10 A or more.
- the coaxial cable is preferably configured such that the characteristic impedance of the coaxial cable is 30 ⁇ or less.
- the characteristic impedance of the cable is large, the responsiveness of the current flowing through the light emitting element is lowered. Therefore, if the coaxial cable is configured such that the characteristic impedance of the coaxial cable is 30 ⁇ or less, the responsiveness of the current flowing through the light emitting element can be further suppressed from decreasing. As a result, it is possible to more reliably suppress a shortage of the amount of light emitted from the light emitting element due to a decrease in responsiveness of the current flowing through the light emitting element.
- the coaxial cable is preferably configured so that the characteristic impedance of the coaxial cable is 15 ⁇ or more.
- the characteristic impedance of the coaxial cable can be reduced by increasing the diameter of the inner conductor of the coaxial cable or by reducing the thickness of the insulator provided between the outer conductor of the coaxial cable and the inner conductor of the coaxial cable. Can be small.
- the coaxial cable is configured so that the characteristic impedance of the coaxial cable is 15 ⁇ or more as in the present invention, the diameter of the inner conductor can be prevented from becoming too large, and the thickness of the insulator is reduced. It can be suppressed.
- the light emitting element and the apparatus main body are preferably connected by a plurality of coaxial cables.
- a coaxial cable having a characteristic impedance of 50 ⁇ or 75 ⁇ is used. Therefore, if the light emitting element and the apparatus main body are connected by a plurality of coaxial cables as described above, a general (general-purpose) coaxial cable can be used without using a dedicated (custom) coaxial cable. Therefore, the combined characteristic impedance of the plurality of coaxial cables can be configured to be smaller than 50 ⁇ or 75 ⁇ .
- the imaging unit that performs acoustic wave imaging based on the acoustic wave signal detected by the detection unit, and the imaging unit and the detection unit are connected.
- a signal cable for transmitting an acoustic wave signal preferably, the coaxial cable and the signal cable are configured to be routed in an integrated state.
- a first shield that covers at least one of the coaxial cable and the signal cable. If comprised in this way, since a 1st shield can shield electromagnetic waves, the electromagnetic waves (noise) which penetrate
- the coaxial cable and the signal cable form a cable group that is routed in an integrated state.
- a second shield that covers the outside of the cable group. If comprised in this way, since a 2nd shield can shield electromagnetic waves, it can shield the electromagnetic waves (noise) which penetrate
- the coaxial cable includes an outer conductor of the coaxial cable connected to a power supply unit of the light source driving unit, and an inner conductor of the coaxial cable is connected to the signal generation unit. It is connected.
- a negative voltage connected to the signal generator can be applied. It is necessary to provide a power supply unit.
- providing a power supply unit capable of applying a negative voltage makes the configuration of the photoacoustic imaging apparatus more complicated than providing a power supply unit capable of applying a positive voltage. Turn into.
- the outer conductor of the coaxial cable is connected to the power source unit of the light source driving unit and the inner conductor of the coaxial cable is connected to the signal generation unit, a negative voltage can be applied. Since it is not necessary to provide a possible power supply unit, it is possible to suppress a shortage of the amount of light emitted from the light emitting element while suppressing a complicated configuration of the photoacoustic imaging apparatus.
- the coaxial cable is preferably configured such that the conductor resistance is 0.5 ⁇ / m or less. If comprised in this way, compared with the case where a coaxial cable is comprised larger than 0.5 ohm / m, the loss of the electric power in the coaxial cable resulting from a conductor resistance can be made small.
- the light source unit including the light emitting element and the light source unit are disposed on the first surface, and the first surface or the second surface opposite to the first surface. It further includes a substrate on which the wiring is arranged, and an electromagnetic wave absorption layer provided so as to cover the wiring from the second surface side of the substrate.
- the part other than the coaxial cable, specifically, the light source unit including the light emitting element suppresses intrusion of electromagnetic waves or the like (noise) from the outside, and suppresses radiation of the electromagnetic waves from the inside to the outside. May be insufficient.
- the photoacoustic imaging apparatus is provided with an electromagnetic wave absorption layer that covers the wiring from the second surface side of the substrate.
- the electromagnetic wave generated from the light source unit and the wiring connected to the light source unit and directed to the detection unit in the vicinity of the light source unit can be absorbed by the electromagnetic wave absorption layer.
- the detection unit since it is possible to suppress the detection of electromagnetic waves by the detection unit, it is possible to suppress noise from being generated on the image generated by the photoacoustic imaging apparatus.
- the electromagnetic wave absorbing layer is formed with a substrate exposed portion for exposing the second surface of the substrate, and is in contact with the second surface of the substrate through the substrate exposed portion of the electromagnetic wave absorbing layer. It is further provided with a heat conduction part for dissipating the heat of the substrate. If comprised in this way, the heat
- the photoacoustic imaging apparatus further includes a housing that accommodates the detection unit.
- the heat conduction unit has one end side in contact with the second surface of the substrate, and the other end. It is comprised so that the side may contact a housing
- the housing includes a heat dissipation unit, and the heat conduction unit is configured such that the other end side is connected to the heat dissipation unit. . If comprised in this way, the heat
- an insulating member is preferably provided between the second surface of the substrate and the electromagnetic wave absorbing layer.
- the withstand voltage can be increased by the insulating layer.
- a high voltage can be applied to the light source unit, and the intensity of light emitted from the light source unit can be increased.
- the photoacoustic imaging apparatus it is preferable to further include a light source unit including a light emitting element, and the light source unit and the detection unit are arranged adjacent to each other.
- the light from the light source unit and the acoustic wave from the subject are attenuated as the propagation distance increases.
- the distance between the light source unit, the detection unit and the subject can be relatively reduced, respectively.
- the acoustic wave can be efficiently detected by the detection unit in a state where the attenuation of the light from the light source unit and the acoustic wave from the subject is suppressed.
- a plurality of light emitting elements are provided, and the plurality of light emitting elements are arranged linearly. If comprised in this way, even when the light quantity per light emitting element is small, with the some light emitting element arranged in a straight line, sufficient light quantity for imaging an acoustic wave as a whole several light emitting element is sufficient. Obtainable.
- the light emitting element is preferably formed of a light emitting diode element.
- the light emitting diode element has lower directivity than the light emitting element that emits laser light, and therefore, even when a positional shift occurs, the light irradiation range is relatively difficult to change.
- precise alignment (positioning) of optical members is not necessary, and an optical surface plate or a strong housing for suppressing characteristic fluctuation due to vibration of the optical system is required. The body becomes unnecessary.
- the light emitting diode element has a smaller amount of light per element than a light emitting element or the like that emits laser light, the light emitting diode element is preferably disposed in the vicinity of the detection unit.
- the coaxial cable is provided so as to connect the probe and the apparatus main body, and more effectively, while suppressing the decrease in the response of the current flowing through the light emitting diode element, By suppressing the intrusion of electromagnetic waves or the like (noise) from the light source, and suppressing the radiation of electromagnetic waves from the inside to the outside, it is possible to suppress the shortage of the amount of light emitted from the light emitting diode element. .
- the light emitting element is preferably constituted by a semiconductor laser element.
- the subject can be irradiated with laser light having relatively high directivity as compared with the light-emitting diode element. Therefore, most of the light from the semiconductor laser element can be reliably irradiated onto the subject. be able to.
- the light emitting element is preferably composed of an organic light emitting diode element. If comprised in this way, the probe part containing an organic light emitting diode element can be reduced in size easily by using an organic light emitting diode element with easy thickness reduction.
- the invasion of electromagnetic waves or the like (noise) from the outside is suppressed while suppressing the response of the current flowing through the light emitting element from being lowered, and from the inside to the outside.
- By suppressing the emission of electromagnetic waves it is possible to suppress a shortage of the amount of light emitted from the light emitting element.
- FIG. 1 is a block diagram illustrating an overall configuration of a photoacoustic imaging apparatus according to a first embodiment of the present invention. It is a figure for demonstrating the experimental result regarding operation
- the photoacoustic imaging apparatus 100 is provided with a probe 1 and an apparatus main body 2 as shown in FIG.
- the photoacoustic imaging apparatus 100 is provided with a coaxial cable 3 and a signal cable 4.
- the coaxial cable 3 and the signal cable 4 are configured to have a length of about 2 m, for example, and are configured to connect the probe 1 and the apparatus main body 2.
- the probe 1 is configured to be moved on the surface of the subject P (such as a human body surface) while being held by an operator.
- the coaxial cable 3 is configured to transmit electric power from the apparatus main body 2 to the probe 1, and the probe 1 generates light by the electric power acquired via the coaxial cable 3 and transmits light to the subject P. Can be irradiated.
- the probe 1 detects an acoustic wave A and an ultrasonic wave B2, which will be described later, from the subject P, and receives the acoustic wave A and the ultrasonic wave B2 via the signal cable 4 as a reception signal.
- the apparatus main body 2 is configured to process and image the received signal detected by the probe 1.
- the apparatus main body 2 is provided with an image display unit 21.
- the image display unit 21 is configured by a liquid crystal panel or the like, and is configured to display an image acquired from the apparatus main body unit 2.
- the probe 1 is provided with a probe main body 11 and illumination units 12 and 13.
- the probe main body 11 is formed in a linear type.
- the illumination unit 12 is disposed in the vicinity of the distal end portion (arrow Z2 direction side) of the probe main body portion 11 and on the arrow X1 direction side, and the illumination portion 13 is disposed on the distal end portion (arrow Z2 direction side of the probe main body portion 11).
- It is arranged in the vicinity and on the arrow X2 direction side.
- the illumination part 12 and the illumination part 13 are arrange
- An acoustic wave detection unit 14 is disposed at the tip of the probe main body 11. That is, the illumination units 12 and 13 are disposed in the vicinity of the acoustic wave detection unit 14.
- the acoustic wave detection unit 14 is an example of the “detection unit” in the present invention.
- the illumination unit 12 is provided with a light source unit 15, and the light source unit 15 is provided with a plurality of (for example, 108) light emitting diode elements 16 capable of irradiating the subject P with light. ing. Further, similarly to the illumination unit 12, the illumination unit 13 is provided with a light source unit 17 provided with a plurality of light emitting diode elements 16. The plurality of light emitting diode elements 16 are arranged in an array (linear shape), and the light emitting diode elements 16 arranged in an array are configured as a surface light source as a whole.
- the light emitting diode element 16 is an example of the “light emitting element” in the present invention.
- the coaxial cable 3 includes coaxial cables 31 and 32.
- the coaxial cable 31 is connected to the arrow Z1 direction side of the illumination unit 12, and the coaxial cable 32 is connected to the arrow Z1 direction side of the illumination unit 13.
- the coaxial cable 31 has, for example, a size such as AWG20 (UL standard size), AWG30, AWG36, or AWG40, and has an internal conductor 3a, an insulator 3b, and an external conductor. It is comprised by 3c and the jacket 3d.
- the inner conductor 3a is disposed at the central portion C of the coaxial cable 31, and is made of, for example, an annealed copper wire, a silver-plated annealed copper wire, a tin-plated copper alloy wire, or a tin-plated annealed copper wire.
- the internal conductor 3a is configured by a single wire or a plurality of (for example, seven) stranded wires.
- the inner conductor 3a is configured such that the outer diameter D of the inner conductor 3a (in the case of a plurality of stranded wires, the outer diameter of the entire stranded wire) is, for example, 0.26 mm or more and 0.30 mm or less. Yes.
- the insulator 3b is provided so as to cover the outer peripheral surface of the internal conductor 3a.
- polyethylene, FEP (tetrafluoroethylene / hexafluoropropylene copolymer), or PFA (perfluoroalkoxy fluorocarbon resin) is provided.
- Etc the insulator 3b is comprised so that the thickness t of the insulator 3b may be 0.08 mm or more and 0.40 mm or less, for example.
- the external conductor 3c is provided so as to cover the outer peripheral surface of the insulator 3b, and has a function of shielding electromagnetic waves (noise) from the outside of the external conductor 3c with respect to the internal conductor 3a. It is configured.
- the outer conductor 3c is configured to have a function of shielding electromagnetic waves (noise) from the inner conductor 3a to the outside.
- the outer conductor 3c is comprised by the annealed copper wire, the tin plating copper alloy wire, or the tin plating annealed copper wire, for example.
- the outer conductor 3c is provided in the state by which the strand with a wire diameter of 0.03 mm or more and 0.08 mm or less was braided or laterally wound, for example.
- the jacket 3d is provided so as to cover the outer peripheral surface of the outer conductor 3c, and is made of, for example, FEP, PVC (polyvinyl chloride), PFA, or PET (polyethylene terephthalate).
- the coaxial cable 31 is configured to have, for example, a conductor resistance of about 1.0 ⁇ / 2 m or less and a characteristic impedance of 22 ⁇ to 75 ⁇ by the above configuration.
- the apparatus main body unit 2 is provided with a light source driving unit 22 and a control unit 23.
- the light source drive unit 22 is configured to acquire power from an external power supply unit (not shown) and supply the acquired power to the light emitting diode element 16 via the coaxial cable 3.
- the control unit 23 includes a CPU (Central Processing Unit) and the like, and is configured to control the entire photoacoustic imaging apparatus 100 by transmitting a control signal to each unit.
- CPU Central Processing Unit
- the light source drive unit 22 is provided with a power supply unit 22a and a signal generation unit 22b.
- the coaxial cables 31 and 32 are configured such that the outer conductor 3c of the coaxial cables 31 and 32 is connected to the power supply unit 22a of the light source driving unit 22 and the inner conductors of the coaxial cables 31 and 32. 3 a is connected to the signal generator 22 b of the light source driver 22.
- the light source driving unit 22 is configured to flow a pulsed current of 10 A or more through the coaxial cables 31 and 32 when generating a pulse irradiation signal for the light emitting diode element 16 to be in a state of irradiating light. Has been.
- the power supply unit 22a is connected to the respective outer conductors 3c of the coaxial cables 31 and 32 and includes, for example, a DC / DC converter and the like, and applies a predetermined voltage (for example, about 200V). It is configured as follows. Further, the outer conductor 3c of the coaxial cables 31 and 32 is connected to the anode of the light emitting diode element 16, and is configured to apply a predetermined voltage to the anode.
- the signal generation unit 22b includes, for example, two FETs (Field Effect Transistors). One drain of the two FETs is connected to the inner conductor 3 a of the coaxial cable 31, and the other drain of the two FETs is connected to the inner conductor 3 a of the coaxial cable 32.
- the inner conductor 3 a of the coaxial cables 31 and 32 is connected to the cathode of the light emitting diode element 16.
- the sources of the FETs of the signal generator 22b are grounded.
- the pulse irradiation signal is generated, thereby generating the anode of the light emitting diode element 16.
- a pulsed current (for example, a peak current of 15 A (10 A or more)) is allowed to flow from the side toward the cathode.
- the light emitting diode element 16 is configured to irradiate the subject P with pulsed light corresponding to the pulsed current.
- the light source driving unit 22 and the control unit 23 are configured such that the pulse width of the pulsed light is about 150 ns, for example.
- generating the pulse irradiation signal represents reducing the voltage on the cathode side of the light emitting diode element 16.
- the light irradiated from the probe 1 onto the subject P is absorbed by the detection object Pa (for example, hemoglobin) in the subject P.
- the detection object Pa expands and contracts (returns from the expanded size to the original size) according to the irradiation intensity (absorption amount) of the pulsed light, whereby the detection target Pa (subject P).
- an acoustic wave A an ultrasonic wave generated when the detection object Pa in the subject P absorbs light
- the ultrasonic wave reflected by the subject P is distinguished and described as “ultrasonic wave B2” to be described later.
- the acoustic wave detection unit 14 is provided with an ultrasonic transducer (not shown) having 128 channels.
- the ultrasonic transducer of the acoustic wave detection unit 14 is composed of a piezoelectric element (for example, lead zirconate titanate (PZT)).
- PZT lead zirconate titanate
- the ultrasonic transducer vibrates.
- a voltage (received signal) is generated.
- the acoustic wave detection unit 14 is configured to transmit the acquired reception signal to an imaging unit 24 (see FIG. 4) described later.
- the ultrasonic transducer of the acoustic wave detection unit 14 is configured to generate the ultrasonic wave B1 by vibrating at a frequency corresponding to the transducer drive signal from the control unit 23, and the ultrasonic wave B1. Is irradiated to the subject P.
- the ultrasonic wave B1 generated by the acoustic wave detection unit 14 is reflected by a substance (detection object Pa) having a high acoustic impedance in the subject P.
- the ultrasonic wave B2 (the ultrasonic wave B1 is reflected) is acquired by the acoustic wave detection unit 14.
- the acoustic wave detection unit 14 is configured to transmit the received signal to the imaging unit 24 even when the ultrasonic wave B2 is acquired, similarly to the case where the acoustic wave A is acquired.
- the photoacoustic imaging apparatus 100 is configured not to overlap the period in which the acoustic wave A is acquired by the acoustic wave detection unit 14 and the period in which the ultrasonic wave B2 is acquired by the acoustic wave detection unit 14.
- the acoustic wave A and the ultrasonic wave B2 can be distinguished from each other.
- the apparatus main body 2 is provided with an imaging unit 24.
- the imaging unit 24 is configured to acquire a sampling trigger signal synchronized with the light trigger signal from the control unit 23 and to acquire a reception signal from the acoustic wave detection unit 14. Then, the imaging unit 24 generates a tomographic image based on the acoustic wave A and a tomographic image based on the ultrasonic wave B2 based on the acquired sampling trigger signal and the acquired received signal, and synthesizes the tomographic image. It is comprised so that the process to perform may be performed.
- the imaging unit 24 is configured to output the synthesized image to the image display unit 21.
- the coaxial cable 3 is used (first embodiment) and the coaxial cable 3 is not used (twisted pair).
- An experiment conducted in order to compare the response of the current flowing through the light emitting diode element 16 with (when using a cable) (comparative example) will be described.
- a 150 ns pulse was applied to the photoacoustic imaging apparatus 100 according to the first embodiment using the coaxial cable 3 (see FIG. 5) and the photoacoustic imaging apparatus using the twisted pair cable (see FIG. 6).
- An optical trigger signal having a width was input, and the waveform of the anode voltage of the light emitting diode element 16, the waveform of the cathode voltage, and the waveform of the current value flowing through the light emitting diode element 16 were measured.
- the response time was measured by acquiring the waveform of the current value flowing through the light emitting diode element 16.
- the conducting wire on one side of the twisted pair of the photoacoustic imaging apparatus using the twisted pair cable is connected to the anode of the power supply unit and the light emitting diode element.
- the waveform of the anode voltage is approximately 200 V and becomes constant.
- the waveform of the anode voltage is a reflected wave having a period of 50 ns and an amplitude (voltage value between the maximum value and the minimum value) of 80V. Occurred and fluctuated.
- the waveform of the cathode voltage (the waveform of the pulse irradiation signal) is substantially 60 V and constant in the photoacoustic imaging apparatus 100 using the coaxial cable 3.
- the waveform of the cathode voltage fluctuates because a reflected wave is generated.
- the value of the current flowing through the light emitting diode element 16 is approximately 15 A (after about 100 ns after the signal level of the light trigger signal is set to H. 10A or more).
- the current value flowing through the light emitting diode element 16 did not reach 10 A after the signal level of the light trigger signal was set to H. .
- the waveforms of the anode voltage and the cathode voltage are approximately 200V. It became constant.
- the waveforms of the anode voltage and the cathode voltage fluctuated due to a reflected wave having an amplitude of 220 V.
- the value of the current flowing through the light emitting diode element 16 is approximately 0 after 50 ns after the signal level of the light trigger signal is set to L. It became.
- the value of the current flowing through the light emitting diode element 16 becomes substantially 0 after 100 ns after the signal level of the light trigger signal is set to L. It was.
- the response time of the current flowing through the light emitting diode element 16 is 150 ns (100 ns + 50 ns), and the photoacoustic image using the twisted pair cable is used. It was found that the response time of the current flowing through the light emitting diode element 16 is at least 250 ns or more in the conversion device (comparative example). Further, in the photoacoustic imaging apparatus 100 using the coaxial cable 3, the value of the current flowing through the light emitting diode element 16 reaches 15A, whereas in the photoacoustic imaging apparatus using the twisted pair cable, it is less than 10A (up to about 9A). It has been found.
- the light waveform (the waveform of the current value flowing through the light-emitting diode element 16) is steep, compared to the photoacoustic imaging apparatus using the twisted pair cable, and It was found that the amount of light can be increased.
- the coaxial cable 3 is provided so as to connect the probe 1 (light emitting diode element 16) and the apparatus main body 2 and the external conductor 3c of the coaxial cable 3 is connected to the light source driving unit.
- the internal conductor 3 a of the coaxial cable 3 is connected to the signal generator 22 b of the light source driver 22.
- the coaxial cable 3 has 10 A or more. It is configured to pass a pulsed current.
- a large current of 10 A or more is caused to flow by using a pulsed current.
- the outer conductor 3c of the coaxial cable 3 is connected to the power supply unit 22a of the light source driving unit 22, and the inner conductor 3a of the coaxial cable 3 is connected to the signal generation unit 22b.
- a negative voltage connected to the signal generator 22b is set. It is necessary to provide a power supply unit that can be applied.
- the configuration of the photoacoustic imaging apparatus 100 is more when providing a power supply unit capable of applying a negative voltage than when providing a power supply unit 22a capable of applying a positive voltage. Complicate.
- the configuration of the photoacoustic imaging apparatus 100 is complicated because the configuration as described above eliminates the need to provide a power supply unit that can apply a negative voltage. While suppressing, it can suppress that the light quantity of the light irradiated from the light emitting diode element 16 runs short.
- the light emitting diode elements 16 are provided in the light source units 15 and 17.
- the light emitting diode element 16 has lower directivity than the light emitting element that emits laser light, the light irradiation range is relatively difficult to change even when a positional shift occurs.
- precise alignment (positioning) of optical members is not necessary, and an optical surface plate or a strong housing for suppressing characteristic fluctuation due to vibration of the optical system is required. The body becomes unnecessary.
- the photoacoustic imaging device 100 is increased in size and the configuration of the photoacoustic imaging device 100 is complicated because precise alignment of the optical members is not required and an optical surface plate and a strong housing are not required. Can be suppressed.
- the light emitting diode element 16 since the light emitting diode element 16 has a smaller light amount per element than a light emitting element or the like that emits laser light, the light emitting diode element 16 is preferably disposed in the vicinity of the acoustic wave detection unit 14. Therefore, in the first embodiment, by providing the coaxial cable 3 so as to connect the probe 1 (light emitting diode element 16) and the apparatus main body 2 to each other, the response of the current flowing through the light emitting diode element 16 is more effectively achieved. It is possible to suppress a shortage of the amount of light emitted from the light emitting diode element 16 by suppressing the intrusion of electromagnetic waves or the like (noise) from the outside while suppressing the deterioration of the property.
- the coaxial cable 3 is configured such that the conductor resistance is 0.5 ⁇ / m or less (1.0 ⁇ / 2 m). Thereby, compared with the case where the coaxial cable 3 is configured with a conductor resistance larger than 0.5 ⁇ / m, it is possible to reduce power loss in the coaxial cable 3 due to the conductor resistance.
- the light source units 15 and 17 including the light emitting diode elements 16 are further provided, and the light source unit 15 (illumination unit 12), the light source unit 17 (illumination unit 13), and the acoustic wave detection unit are included. 14 are arranged adjacent to each other.
- the light from the light sources 15 and 17 and the acoustic wave A from the subject P are more attenuated as the propagation distance increases.
- the light source units 15 and 17, the acoustic wave detection unit 14, and the subject P are arranged by arranging the light source units 15 and 17 and the acoustic wave detection unit 14 adjacent to each other.
- the acoustic wave A is generated by the acoustic wave detection unit 14 in a state in which attenuation of the light from the light source units 15 and 17 and the acoustic wave A from the subject P is suppressed. It can be detected efficiently.
- the plurality of light emitting diode elements 16 are arranged in a straight line (array form). Thereby, even when the light quantity per one light emitting diode element 16 is small, the plurality of light emitting diode elements 16 arranged in a straight line are sufficient to image the acoustic wave A as a whole by the light source sections 15 and 17. A sufficient amount of light can be obtained.
- the photoacoustic imaging apparatus 200 is provided with a coaxial cable having a characteristic impedance of 15 ⁇ or more and 30 ⁇ or less.
- the photoacoustic imaging apparatus 200 is provided with a coaxial cable 203.
- the coaxial cable 203 includes coaxial cables 231 and 232.
- the coaxial cables 231 and 232 are configured such that the characteristic impedance is 15 ⁇ or more and 30 ⁇ or less.
- FIG. 7 shows the relationship between the characteristic impedance of the coaxial cables 231 and 232 and the response time of the current flowing through the light-emitting diode element 16.
- the response time (tr + tf) includes the time tr from when the light emitting diode element 16 acquires the pulse irradiation signal until the current value reaches a substantially peak value, and the current value from when the pulse irradiation signal is stopped. The time obtained by adding the time tf until the time becomes substantially zero is shown.
- the characteristic impedance of the coaxial cable 203 is larger than 30 ⁇ , the characteristic impedance and the response time have a substantially linear relationship. That is, there is a relationship that the response time of the current flowing through the light emitting diode element 16 increases as the characteristic impedance of the coaxial cable 203 increases.
- the response time is relatively constant (80 ns or more and 100 ns or less) with respect to the characteristic impedance.
- the response time was 100 ns. Therefore, by configuring the coaxial cable 203 so that the characteristic impedance of the coaxial cable 203 is 30 ⁇ or less, the response time of the current flowing through the light emitting diode element 16 can be 100 ns or less.
- the inductance L of the coaxial cable 203 can be reduced by increasing the outer diameter D (see FIG. 3) of the inner conductor 3a. Therefore, the characteristic impedance Z can be reduced by increasing the outer diameter D of the inner conductor 3a.
- the outer diameter D of the inner conductor 3a is preferably about 0.3 mm (about AWG30).
- the capacitance C of the coaxial cable 203 can be increased by reducing the thickness t of the insulator 3b. Therefore, the characteristic impedance Z can be reduced by reducing the thickness t of the insulator 3b.
- the withstand voltage (withstand voltage) of the coaxial cable 203 is insufficient.
- the size of the coaxial cable 203 is AWG30, it is possible to secure the withstand voltage of the coaxial cable 203 at 250 V by configuring the insulator 3b with a thickness t such that the characteristic impedance of the coaxial cable 203 is 15 ⁇ or more. It becomes possible.
- the coaxial cable 203 is configured so that the characteristic impedance of the coaxial cable 203 is 30 ⁇ or less.
- the characteristic impedance of the coaxial cable 203 is configured to be larger than 30 ⁇ , it is possible to further suppress the response time of the current flowing through the light emitting diode element 16 from being increased (the responsiveness is lowered). .
- the coaxial cable 203 is configured so that the characteristic impedance of the coaxial cable 203 is 15 ⁇ or more. As a result, it is possible to suppress the outer diameter D of the inner conductor 3a from becoming too large as compared with the case where the characteristic impedance of the coaxial cable 203 is less than 15 ⁇ , and the thickness t of the insulator 3b becomes too small. Can be suppressed. As a result, by suppressing the outer diameter D of the inner conductor 3a from becoming too large, it is possible to prevent the operability of the probe 1 from deteriorating, and that the thickness t of the insulator 3b becomes too small. By suppressing, it can suppress that the withstand pressure
- the configuration of the photoacoustic imaging apparatus 300 according to the third embodiment will be described with reference to FIG.
- the two light source sections of the probe and the apparatus main body section are different from the photoacoustic imaging apparatuses according to the first embodiment and the second embodiment, respectively connected by one coaxial cable,
- the two light source sections of the probe and the apparatus main body section are connected by two (plural) coaxial cables.
- the photoacoustic imaging apparatus 300 is provided with a coaxial cable 303.
- the photoacoustic imaging apparatus 300 is provided with an illumination unit 312 including a light source unit 315, an illumination unit 313 including a light source unit 317, and a light source driving unit 322.
- the coaxial cable 303 includes a first coaxial cable 331 and a second coaxial cable 332 that connect the light source unit 315 and the light source driving unit 322.
- the first coaxial cable 331 and the second coaxial cable 332 are connected in parallel to the light source unit 315 and the light source driving unit 322. Further, when power is supplied from the light source driving unit 322 to the light source unit 315, the total value of the current values (peak values) flowing through the first coaxial cable 331 and the second coaxial cable 332 is 10A or more. It is configured.
- the coaxial cable 303 includes a third coaxial cable 333 and a fourth coaxial cable 334 that connect the light source unit 317 and the light source driving unit 322, and the third coaxial cable 333 and the fourth coaxial cable 334 include the light source unit 317. And the light source driving unit 322 are connected in parallel. Further, when electric power is supplied from the light source driving unit 322 to the light source unit 317, the total value of current values (peak values) flowing through the third coaxial cable 333 and the fourth coaxial cable 334 is 10A or more. It is configured.
- first coaxial cable 331, the second coaxial cable 332, the third coaxial cable 333, and the fourth coaxial cable 334 are configured in the same manner, and are configured to have a characteristic impedance of about 50 ⁇ respectively. ing. And the 1st coaxial cable 331 and the 2nd coaxial cable 332 connected in parallel will be in the state which has a characteristic impedance of about 25 ohms, when each characteristic impedance is synthesize
- the coaxial cable 303 has a characteristic impedance of 30 ⁇ or less (see FIG. 7), like the coaxial cable 203 according to the second embodiment, the responsiveness of the current flowing through the light emitting diode element 16 is reduced. Can be further suppressed.
- the other configuration of the photoacoustic imaging apparatus 300 according to the third embodiment is the same as that of the photoacoustic imaging apparatus 100 according to the first embodiment.
- the probe 1 and the apparatus main body 2 are connected by the first coaxial cable 331, the second coaxial cable 332, the third coaxial cable 333, and the fourth coaxial cable 334.
- a coaxial cable having a characteristic impedance of 50 ⁇ (or 75 ⁇ ) is used. Therefore, by configuring as described above, the characteristic impedance of the coaxial cable 303 can be easily set to 50 ⁇ (or 75 ⁇ ) using a general (general-purpose) coaxial cable without using a dedicated (custom-made) coaxial cable. Can be configured to a smaller value.
- Other effects of the photoacoustic imaging apparatus 300 according to the third embodiment are the same as those of the photoacoustic imaging apparatus 100 according to the first embodiment.
- the signal cable and the coaxial cable are different from the photoacoustic imaging apparatuses according to the first to third embodiments that are connected to the probe and the apparatus main body so as to be routed separately.
- the signal cable and the coaxial cable are connected to the probe and the apparatus main body so as to be routed integrally.
- the photoacoustic imaging apparatus 400 is provided with a probe 401 and a cable 402.
- a coaxial cable 403 and a signal cable 404 are provided inside the cable 402, and the coaxial cable 403 and the signal cable 404 are configured to be routed together.
- the cable 402 is provided with a jacket 405 so as to cover the coaxial cable 403 and the signal cable 404.
- the signal cable 404 includes a plurality of (128 cables) wired to each of the channels (128 channels) of the ultrasonic transducer described above. Each cable is configured to transmit a signal when signals are transmitted and received between each channel of the ultrasonic transducer and the control unit 23 and the imaging unit 24.
- the signal cable 441 includes a conductor 441a and a jacket 441b (insulator) that covers the outer peripheral surface of the conductor 441a.
- the signal cable 442 includes a conductor 442a and a jacket 442b (insulator) that covers the outer peripheral surface of the conductor 442a.
- the cable 402 includes a shield 403 a that covers the outside of the coaxial cable 403.
- the shield 403a is an example of the “first shield” in the present invention.
- the coaxial cable 403 includes coaxial cables 431 and 432.
- the coaxial cable 431 is provided with an internal conductor 431a, an insulator 431b, an external conductor 431c, and a jacket 431d (insulator) in this order from the inside to the outside.
- the coaxial cable 432 includes an inner conductor 432a, an insulator 432b, an outer conductor 432c, and a jacket 432d (insulator).
- the shield 403a is made of metal and configured to shield electromagnetic waves.
- the shield 403a is provided so as to integrally cover the outer sides of the coaxial cables 431 and 432 arranged adjacent to each other.
- the shield 403a may be grounded.
- the cable 402 includes a jacket 403b (insulator) that covers the outer peripheral surface of the shield 403a inside the jacket 405.
- the probe 401 is configured such that a light source unit 415 and an acoustic wave detection unit 414 are disposed therein.
- the coaxial cable 403 is connected to the light source unit 415, and the signal cable 404 is connected to the acoustic wave detection unit 414.
- the coaxial cable 403 and the signal cable 404 are configured to be routed in an integrated state. Thereby, since the coaxial cable 403 and the signal cable 404 are not separated from each other, the coaxial cable 403 and the signal cable 404 are separated from each other as compared with the case where the coaxial cable 403 and the signal cable 404 are arranged separately. Operability can be improved.
- the cable 402 is provided with the shield 403a covering the outside of the coaxial cable 403. Accordingly, since the shield 403a can shield electromagnetic waves, the electromagnetic waves (noise) entering the coaxial cable 403 covered with the shield 403a and the electromagnetic waves radiated from the coaxial cable covered with the shield 403a are shielded. can do.
- the other effects of the photoacoustic imaging apparatus 400 according to the fourth embodiment are the same as those of the photoacoustic imaging apparatus 100 according to the first embodiment.
- the cable 502 is provided with a shield 505 a that covers the outside of the cable group 502 a including the coaxial cable 403 and the signal cable 404.
- a cable 502 is provided in the photoacoustic imaging apparatus 500 according to the fifth embodiment.
- the cable 502 includes a coaxial cable 403 and a signal cable 404.
- the cable 502 includes a shield 403a that covers the outside of the coaxial cable 402 and a shield 404a that covers the outside of the signal cable 402.
- the shields 403a and 404a are examples of the “first shield” in the present invention.
- the shield 403a is configured similarly to the shield 403a of the photoacoustic imager 400 according to the fourth embodiment.
- the shield 404a is made of metal like the shield 403a and is configured to shield electromagnetic waves.
- the signal cable 404 includes signal cables 441 and 442.
- the shield 404a is disposed so as to cover from the outside of the signal cables 441 and 442 disposed adjacent to each other.
- the cable 502 includes a jacket 403b (insulator) that covers the outer peripheral surface of the shield 403a and a jacket 404b that covers the outer peripheral surface of the shield 404a.
- the coaxial cable 403 and the signal cable 404 form a cable group 502a that is routed in an integrated state, and the cable 502 is a shield 505a that covers the outside of the cable group 502a.
- the shield 505a is an example of the “second shield” in the present invention.
- the cable group 502a includes a coaxial cable 403, a shield 403a, and a jacket 403b, and a signal cable 404, a shield 404a, and a jacket 404b.
- the cable 502 includes a shield 505a that covers the outside of the cable group 502a.
- the shield 505 is made of metal and configured to shield electromagnetic waves.
- the cable 502 includes a jacket 505b that covers the outer peripheral surface of the shield 505a. Accordingly, the cable group 505a is configured to be integrally routed by the jacket 505b while shielding electromagnetic waves by the shield 505a.
- the coaxial cable 403 and the signal cable 404 are configured to form a cable group 502a that is routed in an integrated state, and the cable 502 includes a cable group 502a.
- a shield 505a is provided to cover the outside. Accordingly, since the shield 505a can shield electromagnetic waves, it can shield electromagnetic waves (noise) entering from the outside of the cable group 502a and electromagnetic waves radiated to the outside of the cable group 502a.
- the photoacoustic imaging apparatus 600 includes a first casing 610a, a second casing 610b, a light source unit 620, and a substrate 630.
- the photoacoustic imaging apparatus 600 includes an insulating member 640, an electromagnetic wave absorption layer 650, a heat conduction unit 660, a detection unit 670 (see FIG. 13), and an apparatus main body 680 (see FIG. 18). ).
- the insulating member 640 and the electromagnetic wave absorbing layer 650 are omitted.
- the first casing 610a and the second casing 610b are made of resin.
- the first housing 610a is an example of the “housing” in the present invention.
- the first housing 610 a houses the detection unit 670.
- the first casing 610a includes a heat radiating portion 601a at the upper portion (Z1 side).
- the heat radiation part 601a is made of a metal such as aluminum, for example.
- a linear type, a convex type, a sector type, or the like can be applied as the first casing 610a (photoacoustic imaging apparatus 600).
- the second casing 610b accommodates a light source unit 620, a substrate 630, an insulating member 640 (see FIG. 14), and an electromagnetic wave absorption layer 650 (see FIG. 14).
- a pair of second casings 610b are provided so as to sandwich the first casing 610a.
- the Z2 side of the second casing 610b is configured to transmit light.
- the light source unit 620 is disposed in the vicinity of the detection unit 670. As shown in FIG. 15, the light source unit 620 is provided on the first surface 630 a side (Z2 side) of the substrate 630.
- the light source unit 620 includes a plurality of light emitting elements 620a.
- the light emitting element 620a is configured by an LED element (light emitting diode element). Further, the light emitting elements 620a adjacent to each other in the longitudinal direction (X direction) of the substrate 630 are connected to each other by a bonding wire (not shown). Each light emitting element 620a is connected in series.
- the light source unit 620 is configured to irradiate the subject P (see FIG. 13) with light.
- the detection object Pa see FIG.
- substrate 630 is a concept which shows the surface which opposes the test object P of the board
- the ultrasonic wave in this specification is a sound wave (elastic wave) whose frequency is so high that it does not cause an auditory sensation in a person with normal hearing ability, and is a concept indicating a sound wave of about 16000 Hz or higher.
- the ultrasonic wave generated when the detection object Pa in the subject P absorbs the light emitted from the light source unit 620 is referred to as “acoustic wave”.
- the ultrasonic wave generated by the detection unit 670 an ultrasonic transducer 673 described later
- reflected by the detection target Pa in the subject P is simply referred to as “ultrasonic wave”.
- the substrate 630 is a plate-like aluminum substrate.
- the surface of the substrate 630 is covered with an insulating film.
- the substrate 630 has a rectangular shape extending in the X direction in plan view.
- the substrate 630 is configured such that the light source unit 620 is disposed on the first surface 630a.
- the substrate 630 is accommodated in the second casing 610b so that the first surface 630a faces the subject P. Further, the substrate 630 is disposed below an ultrasonic transducer 673 (see FIG. 13) of the detection unit 670 described later in the use state shown in FIG.
- a wiring 631 is provided on the second surface 630b of the substrate 630 opposite to the first surface 630a (Z1 side).
- the wiring 631 is provided on the insulating film of the substrate 630. Unlike the case where both the light source unit 620 and the wiring 631 are arranged on the first surface 630a by arranging the light source unit 620 on the first surface 630a and the wiring 631 on the second surface 630b, the substrate 630 in plan view. Can be reduced in size (area). As a result, the second housing 610b can be formed in a compact manner.
- the wiring 631 may be configured by, for example, a metal wiring such as copper, or may be a wiring pattern formed on the second surface 630b.
- the light source unit 620 is electrically connected to the wiring 631 through the through hole 630c at both ends in the X direction. Further, the wiring 631 is connected to the coaxial cable 3 (31 and 32) (see FIG. 13) at the connection portion 631a.
- the coaxial cable 3 is processed so as not to generate electromagnetic waves.
- the insulating member 640 is formed of a film member.
- the insulating member 640 is made of a material made of an insulator.
- a polyimide film or the like can be used for the insulating member 640.
- the insulating member 640 has a rectangular shape (see FIG. 16) in which the X direction is the longitudinal direction in plan view.
- the insulating member 640 is provided between the second surface 630 b of the substrate 630 and the electromagnetic wave absorption layer 650.
- the insulating member 640 is provided so as to cover the second surface 630b of the substrate 630 substantially over the entire surface (see FIG. 16).
- the insulating member 640 is in close contact with each of the second surface 630b of the substrate 630 and the electromagnetic wave absorbing layer 650.
- the insulating member 640 is provided so as to cover the wiring 631 of the substrate 630.
- the insulating member 640 is disposed so as to be in close contact with the wiring 631.
- the insulating member 640 is attached to each of the second surface 630b of the substrate 630 and the electromagnetic wave absorption layer 650 with an adhesive.
- the insulating member 640 is formed with a notch-shaped substrate exposed portion 641 for exposing a part of the second surface 630b of the substrate 630.
- the electromagnetic wave absorbing layer 650 is composed of a sheet-like member.
- the electromagnetic wave absorption layer 650 is configured to cover the wiring 631 from the second surface 630b side (Z1 side) of the substrate 630.
- the electromagnetic wave absorbing layer 650 is configured to cover the entire surface of the insulating member 640 opposite to the substrate 630 side (Z1 side) (see FIG. 16).
- the electromagnetic wave absorbing layer 650 is attached to the second surface 630b of the substrate 630 with the insulating member 640 interposed therebetween.
- the electromagnetic wave absorption layer 650 is provided so as to cover the wiring 631 and the second surface 630b of the substrate 630 over substantially the whole with the insulating member 640 interposed therebetween.
- the electromagnetic wave absorbing layer 650 is provided with a notch-shaped substrate exposed portion 651 (see FIG. 16) for exposing the second surface 630b of the substrate 630.
- the substrate exposed portion 651 is provided at a position corresponding to the substrate exposed portion 641 of the insulating member 640.
- the electromagnetic wave absorbing layer 650 includes a magnetic material and a dielectric.
- a magnetic material a ferromagnetic metal, a ferromagnetic alloy, a ferromagnetic sintered body, a ferromagnetic oxide, or the like can be used.
- Fe, Ni, Co, Gd, etc. can be used as the ferromagnetic metal.
- the ferromagnetic alloy Fe-Ni alloys such as permalloy and supermalloy, permendur (Fe—Co alloy), sendust (Fe—Si—Al alloy), SmCo, NdFeB, and the like can be used.
- a ferromagnetic sintered body can be used.
- the magnetic body absorbs a magnetic field component in the electromagnetic wave, and converts it into heat.
- the dielectric rubber, resin, glass, ceramic, or the like can be used. The dielectric absorbs an electric field component of the electromagnetic wave, and converts it into heat.
- the heat conducting part 660 is configured by a heat pipe having a cavity 660a inside. Moreover, the heat conductive part 660 is comprised by metals, such as copper, for example.
- the heat conduction part 660 includes a diameter-enlarged part 661 on one end side (Z2 side). As a result, the contact area with the substrate 630 can be increased, so that heat can be efficiently removed from the substrate 630.
- the heat conducting portion 660 has one end side (the enlarged diameter portion 661) on the second surface 630 b of the substrate 630 with the substrate exposed portion 651 of the electromagnetic wave absorbing layer 650 and the substrate exposed portion 641 of the insulating member 640 interposed therebetween. Direct contact is taken away from the heat of the substrate 630.
- the insulation process is given to the surface of one edge part side (diameter enlarged part 661).
- the heat conduction part 660 has the other edge part side (Z1 side) contacting the 1st housing 610a.
- the other end side (Z1 side) of the heat conducting unit 660 is connected to the heat radiating unit 601a of the first casing 610a.
- the heat conducting unit 660 is configured such that heat moves from the high temperature side (Z2 side) in contact with the substrate 630 to the low temperature side (Z1 side).
- the detection unit 670 is configured to detect an acoustic wave generated from the detection object Pa (see FIG. 13) in the subject P that has absorbed the light emitted from the light source unit 620.
- the detection unit 670 includes an acoustic lens 671, an acoustic matching layer 672, an ultrasonic transducer 673, and a backing material 674.
- the detection unit 670 is configured to irradiate ultrasonic waves.
- the detection unit 670 is configured to detect ultrasonic waves and acoustic waves.
- the detection unit 670 detects an acoustic wave (ultrasonic wave) generated from the detection target Pa in the subject P when the subject P is irradiated with light from the light source unit 620.
- the photoacoustic imaging apparatus 600 is configured to be able to image the detection object Pa based on the acoustic wave detected by the detection unit 670.
- the detection unit 670 is configured to irradiate the subject P with ultrasonic waves from the ultrasonic transducer 673 and to detect the ultrasonic waves reflected by the detection target Pa in the subject P.
- the photoacoustic imaging apparatus 600 is configured to be able to image a detection target based on the reflected ultrasonic waves detected by the detection unit 670.
- the acoustic lens 671 (see FIG. 13) is configured to irradiate the subject P while focusing the ultrasonic waves from the acoustic matching layer 672 (ultrasonic transducer 673).
- the acoustic matching layer 672 (see FIG. 13) is composed of a plurality of layers having different acoustic impedances, and is configured to match the acoustic impedance between the ultrasonic transducer 673 and the subject P.
- the ultrasonic vibrator 673 (see FIG. 13) is composed of a piezoelectric element (for example, lead zirconate titanate (PZT)).
- the ultrasonic vibrator 673 vibrates by applying a voltage to generate an ultrasonic wave, and vibrates to generate a voltage (reception signal) when an acoustic wave (ultrasonic wave) is detected. Further, the ultrasonic vibrator 673 generates a voltage also by electromagnetic waves generated from the light source unit 620 and the wiring 631, and generates an ultrasonic wave by being vibrated.
- the ultrasonic wave caused by the electromagnetic wave is reflected by the detection object Pa in the subject P, and the reflected ultrasonic wave is detected by the ultrasonic vibrator 673 (detection unit 670). Is the cause of getting on.
- the backing material 674 (see FIG. 13) is arranged behind the ultrasonic transducer 673 (Z1 side), and is configured to suppress propagation of ultrasonic waves and acoustic waves backward.
- the apparatus main body 680 includes a controller 681, a light source driver 682, a signal processor 683, and an image display 684.
- the control unit 681 includes a CPU (Central Processing Unit) and the like, and is configured to operate based on a predetermined program.
- the control unit 681 is configured to perform overall control of the photoacoustic imaging apparatus 600.
- the light source driving unit 682 is configured to acquire power from an external power supply unit (not shown).
- the light source driving unit 682 is disposed in a device main body 680 that is separate from the first housing 610 a that houses the detection unit 670. Thereby, it can suppress that the noise resulting from the electromagnetic waves irradiated from the light source drive part 682 by the detection part 670 is detected.
- the light source driving unit 682 is configured to acquire the light trigger signal from the control unit 681 and supply power to the light source unit 620 based on the acquired light trigger signal.
- the light source driving unit 682 is configured to supply power based on the light trigger signal to the light source unit 620 via the coaxial cable 3 (see FIG. 13) connected to the wiring 631 of the substrate 630. Further, the light source driving unit 682 is configured to generate pulsed light having a pulse width of about 150 ns from the light source unit 620, for example.
- the signal processing unit 683 is configured to acquire a sampling trigger signal synchronized with the optical trigger signal from the control unit 681.
- the signal processing unit 683 is configured to acquire a voltage (reception signal) when the ultrasonic transducer 673 vibrates by detecting an acoustic wave (ultrasonic wave) from the detection unit 670.
- the signal processing unit 683 generates a tomographic image based on the acoustic wave and a tomographic image based on the ultrasonic wave based on the acquired sampling trigger signal and the acquired received signal, and performs a process of synthesizing the tomographic image.
- the synthesized image is output to the image display unit 684.
- the image display unit 684 is configured by a liquid crystal panel or the like.
- the image display unit 684 is configured to display the synthesized image.
- the speed Vc (3 ⁇ 10 8 m / s) of light emitted from the light source unit 620 is extremely large (Vc >> Vs) compared with the speed of the acoustic wave (ultrasonic wave) Vs.
- Vc very large
- Vs the speed of the acoustic wave
- the time t1 until the light emitted from the light source unit 620 reaches the detection target Pa is the time t2 until the ultrasonic wave generated from the detection unit 670 reaches the detection target Pa, and the sound.
- t1 can be regarded as substantially 0 in the relationship between t2 and t3.
- FIG. 19 is a diagram schematically showing an image generated by a photoacoustic imaging apparatus not provided with an electromagnetic wave absorbing layer.
- a photoacoustic imaging apparatus without an electromagnetic wave absorption layer was used, a real image RI indicating a stainless bar (detection object Pa) was confirmed at a position corresponding to 20 mm from the surface of the agar.
- an acoustic wave from the stainless steel rod is detected after t1 + t3 ( ⁇ t3) from the time t0 when the light is emitted.
- An image generated from this acoustic wave is a real image RI.
- a virtual image VI was confirmed at a position corresponding to 40 mm from the surface of the agar (a position where there is no stainless steel rod).
- electromagnetic waves are generated from the light source unit and the wiring simultaneously with the time t0 when the light is irradiated. That is, the ultrasonic transducer of the detection unit is vibrated at time t0. Thereby, the ultrasonic wave reflected by the stainless steel rod is detected after time t0 to t2 + t3 ( ⁇ 2 ⁇ t3).
- the virtual image VI is generated at a depth position twice as large as the depth position of the real image RI (position from the surface of the subject P).
- An image generated from this ultrasonic wave is a virtual image VI, and the virtual image VI is noise caused by electromagnetic waves generated from the light source unit and the wiring simultaneously with light irradiation.
- FIG. 20 is a diagram schematically showing an image generated by the photoacoustic imaging apparatus 600 provided with the electromagnetic wave absorbing layer 650.
- the photoacoustic imaging apparatus 600 provided with the electromagnetic wave absorption layer 650 was used, only a real image RI indicating a stainless rod (detection object Pa) was confirmed at a position corresponding to 20 mm from the surface of the agar.
- t1 + t3 ( ⁇ t3) from time t0 when the light is irradiated
- An acoustic wave from the stainless steel rod is detected.
- An image generated from this acoustic wave is a real image RI.
- the surface is 40 mm from the surface of the agar.
- the virtual image VI was not confirmed at the corresponding position (position where the stainless steel rod does not exist). Accordingly, it was confirmed that the electromagnetic wave generated from the light source unit 620 and the wiring 631 was absorbed by the electromagnetic wave absorption layer 650 at the same time t0 when the light source unit 620 was irradiated with light.
- the electromagnetic wave absorption layer 650 that covers the wiring 631 from the second surface 630b of the substrate 630 is provided.
- the portion other than the coaxial cable 3, specifically, the light source unit 620 including the light emitting element 620 a suppresses intrusion of electromagnetic waves and the like (noise) from the outside, and emits electromagnetic waves from the inside to the outside. It may be insufficient to suppress.
- the photoacoustic imaging apparatus 600 is provided with an electromagnetic wave absorption layer 650 that covers the wiring 631 from the second surface 630b side of the substrate 630.
- the electromagnetic wave absorbing layer 650 can absorb the electromagnetic wave generated from the light source unit 620 and the wiring 631 connected to the light source unit 620 and directed to the detection unit 670 in the vicinity of the light source unit 620. As a result, it is possible to suppress the detection of electromagnetic waves by the detection unit 670, and thus it is possible to suppress noise from being generated on the image generated by the photoacoustic imaging apparatus 600.
- the substrate exposure part 651 for exposing the second surface 630b of the substrate 630 is formed in the electromagnetic wave absorption layer 650.
- a heat conducting unit 660 is provided to be in contact with the second surface 630b of the substrate 630 through the substrate exposed portion 651 of the electromagnetic wave absorbing layer 650 and to dissipate the heat of the substrate 630.
- the heat generated from the light source unit 620 can be effectively radiated from the second surface 630b of the substrate 630 by the heat conducting unit 660.
- the lifetime of the light source unit 620 can be extended.
- a first housing 610a that houses the detection unit 670 is provided.
- the heat conducting unit 660 is configured such that one end side is in contact with the second surface 630b of the substrate 630 and the other end side is in contact with the first housing 610a.
- the heat generated by the light source unit 620 can be released to the first casing 610a side by the heat conducting unit 660.
- the heat generated from the light source unit 620 can be radiated more effectively.
- the heat radiating portion 601a is provided in the first casing 610a. Further, the other end side of the heat conducting unit 660 is connected to the heat radiating unit 601a. Thereby, the heat generated from the light source unit 620 can be radiated more effectively by the heat radiating unit 601a on the other end side of the heat conducting unit 660.
- the insulating member 640 is provided between the second surface 630b of the substrate 630 and the electromagnetic wave absorption layer 650. Thereby, the withstand voltage can be increased by the insulating layer. As a result, a high voltage can be applied to the light source unit 620 and the intensity of light emitted from the light source unit 620 can be increased.
- the light emitting element 620a of the light source unit 620 is configured by a light emitting diode element.
- the seventh embodiment unlike the sixth embodiment in which the insulating member 640 is provided between the second surface 630b of the substrate 630 and the electromagnetic wave absorption layer 650, the second surface 630b of the substrate 630 and the electromagnetic wave
- the photoacoustic imaging apparatus 700 in which the insulating member 640 is not provided between the absorption layer 650 and the absorption layer 650 will be described. Note that in the seventh embodiment, identical symbols are used for configurations similar to those in the sixth embodiment and descriptions thereof are omitted.
- the electromagnetic wave absorbing layer 650 is provided in contact with the second surface 630b side of the substrate 630.
- the electromagnetic wave absorbing layer 650 is configured to cover the second surface 630b of the substrate 630 over substantially the whole. Further, the Z2 side surface of the electromagnetic wave absorbing layer 650 is subjected to insulation treatment.
- the electromagnetic wave absorbing layer 650 is provided so as to directly cover the wiring 631 and the second surface 630b of the substrate 630.
- the electromagnetic wave absorption layer 650 is disposed so as to be in close contact (contact) with the wiring 631 and the second surface 630b of the substrate 630. Further, the electromagnetic wave absorbing layer 650 is attached to the second surface 630b of the substrate 630 with an adhesive.
- the electromagnetic wave absorbing layer 650 can be brought into close contact (contact) with the wiring 631 and the second surface 630b of the substrate 630, the electromagnetic wave irradiated from the wiring 631 can be reliably absorbed.
- the structure of the photoacoustic imaging apparatus 700 can be simplified. Further, unlike the configuration in which the insulating member 640 is provided, the number of parts can be reduced.
- the sheet-like insulating member 640 since the sheet-like insulating member 640 is provided, a higher voltage can be easily applied to the light source unit 620 than in the seventh embodiment, and thus the light emitted from the light source unit 620 Can be easily increased in strength.
- the remaining configuration of the seventh embodiment is similar to that of the aforementioned sixth embodiment.
- detection of electromagnetic waves by the detection unit 670 can be suppressed, so that noise generated on the image generated by the photoacoustic imaging apparatus 700 is suppressed. be able to.
- the photoacoustic imaging apparatus 800 includes a first casing 610 a, a second casing 610 b, a light source unit 620, and a substrate 630.
- the photoacoustic imaging apparatus 800 includes an insulating member 640 (see FIG. 14), an electromagnetic wave absorption layer 650 (see FIG. 14), a detection unit 670, and an apparatus main body 680 (see FIG. 18). .
- the configuration of the photoacoustic imaging apparatus 800 can be simplified, unlike the configuration in which the heat conducting unit 660 is provided. Further, unlike the configuration in which the heat conducting unit 660 is provided, the number of parts can be reduced.
- the remaining configuration of the eighth embodiment is similar to that of the aforementioned sixth embodiment.
- detection of electromagnetic waves by the detection unit 670 can be suppressed, so that noise generated on the image generated by the photoacoustic imaging apparatus 800 is suppressed. be able to.
- a light-emitting diode element is used as the light-emitting element of the present invention
- the present invention is not limited to this.
- a light emitting element other than the light emitting diode element may be used as the light emitting element.
- a semiconductor laser element may be used as the light emitting element.
- the present invention is not limited to this.
- the apparatus main body 2a may be configured to include a light source drive main body 2b and an imaging unit main body 2c.
- the apparatus main body 2a according to the first modification includes a light source drive main body 2b and an imaging main body 2c.
- a light source drive unit 2d is provided inside the light source drive unit main body 2b.
- the configuration excluding the light source driving unit 2d (22) of the apparatus main body 2 according to the first embodiment is disposed inside the imaging unit main body 2c.
- the light source driving unit main body 2b and the imaging unit main body 2c are connected by a control cable 2e, and are configured to transmit a light trigger signal from the imaging unit main body 2c to the light source driving unit main body 2b.
- a coaxial cable 3 is connected to the light source drive unit main body 2b, and a signal cable 4 is connected to the imaging unit main body 2c.
- the outer conductor of the coaxial cable according to the present invention is connected to the power source unit of the light source driving unit, and the inner conductor of the coaxial cable is connected to the signal generating unit.
- the present invention is not limited to this.
- the outer conductor of the coaxial cable may be grounded, and the inner conductor of the coaxial cable may be connected to the signal generation unit.
- the outer conductor 3c of the coaxial cable 3 may be grounded, and the inner conductor 3a of the coaxial cable 3 may be connected to the signal generator 922b.
- the light source driving unit 922 includes a power supply unit 922a and a signal generation unit 922b.
- the power supply unit 922a is connected to the signal generation unit 922b and is configured to be able to apply a negative voltage (for example, ⁇ 200 V).
- the outer conductor 3c of the coaxial cable 3 is grounded, and the inner conductor 3a of the coaxial cable 3 is connected to the signal generation unit 922b.
- the cathode of the light emitting diode element 16 connected to the inner conductor 3a of the coaxial cable 3 becomes a negative voltage, and the light emitting diode element 16 A current flows from the anode side to the cathode side. Since the outer conductor 3c of the coaxial cable 3 is grounded, a potential difference from the outside (for example, ground) rather than the jacket 3d as compared with the case where the outer conductor 3c is connected to the power supply unit 922a (or 22a). Becomes smaller. As a result, it is possible to suppress an increase in the thickness of the jacket 3d of the coaxial cable 3.
- one or two coaxial cables of the present invention are provided for one light source unit.
- the present invention is not limited to this. Absent.
- three or more coaxial cables may be provided for one light source unit.
- the coaxial cable of the present invention is configured to use a plurality of coaxial cables each having a characteristic impedance of 50 ⁇
- the coaxial cable may be configured to use a plurality of coaxial cables each having a characteristic impedance other than 50 ⁇ .
- a plurality of coaxial cables having a characteristic impedance of 75 ⁇ may be used.
- the example in which one or two light source units of the present invention are provided in the probe is shown.
- the present invention is not limited to this.
- three or more light source units may be provided on the probe.
- three light source units may be provided on the probe, and a coaxial cable may be connected to each.
- the withstand voltage 250 V
- the optical trigger signal pulse time width 150 ns
- the cable length 2 m
- the withstand voltage may be configured to 300 V
- the pulse time width may be configured to 100 ns
- the cable may be configured to 3 m.
- the probe of the present invention is configured in a linear shape.
- the present invention is not limited to this.
- the probe may have a shape other than the linear type.
- the probe may have a convex shape or a sector shape.
- the probe of the present invention is provided with both the light emitting diode element (illumination unit) and the acoustic wave detection unit (probe main body unit). Not limited. In the present invention, it is not necessary to provide both the light emitting diode element and the acoustic wave detector in the probe.
- an acoustic wave detection unit may be provided in the probe, and an illumination unit including a light emitting diode element may be arranged separately from the probe.
- the present invention is not limited to this.
- a light emitting element other than the light emitting diode element may be used as the light emitting element.
- the semiconductor laser element 16a or the organic light emitting diode element 16b may be used as the light emitting element.
- the illumination unit 12a (and 13a) according to the third modification includes a light source unit 15a (and 17a), and the light source unit 15a (and 17a) includes a semiconductor laser element 16a.
- the semiconductor laser element 16a can irradiate the subject P with laser light having a relatively high directivity as compared with the light emitting diode element, the most part of the light from the semiconductor laser element 16a is reliably covered.
- the specimen P can be irradiated.
- the illumination unit 12b (and 13b) according to the fourth modification includes a light source unit 15b (and 17b), and the light source unit 15b (and 17b) includes an organic light emitting diode element 16b.
- the organic light emitting diode element 16b can be easily reduced in thickness, and the light source unit 15b (and 17b) can be easily reduced in size.
- the signal generation unit may be provided with a number of FETs other than two.
- the signal generation unit may be provided with a number of FETs other than two.
- the forward voltage values of the light-emitting diode elements are substantially equal (small variation)
- one An FET may be provided, and the inner conductors of the two coaxial cables may be connected to the drain of the FET.
- the cable 402 is provided with a shield 403a (first shield) that covers the outside of the coaxial cable 403
- the cable 502 is connected to the outside of the coaxial cable 403.
- this invention is not limited to this.
- a shield 404a that covers the outside of the signal cable 404 without providing a shield 403a that covers the outside of the coaxial cable 403, as in the cable 402a according to the fourth modification of the fourth embodiment and the fifth embodiment shown in FIG. A (first shield) may be provided.
- the cable 402a according to the fifth modification includes a coaxial cable 403 and a signal cable 404 as shown in FIG.
- the cable 402 a is provided with a shield 404 a that covers the outside of the signal cable 404.
- the cable 402a includes a jacket 404b that covers the outer peripheral surface of the shield 404a, and a jacket 405a that covers the outside of the coaxial cable 403, the signal cable 404, the shield 404a, and the jacket 404b.
- the cable 402a is configured so that the coaxial cable 403 and the signal cable 404 covered with the shield 404a can be routed integrally.
- the light source unit 620 is provided on the first surface 630a of the substrate 630 and the wiring 631 is provided on the second surface 630b.
- the present invention is not limited to this.
- a wiring 631 may be provided on the first surface 630a of the substrate 630 as in the sixth modification shown in FIG.
- the electromagnetic wave absorbing layer 650 may be provided not only on the second surface 630b of the substrate 630 but also on the first surface 630a.
- the electromagnetic wave absorbing layer 650 of a sheet-like member is provided, but the present invention is not limited to this.
- a paste-like electromagnetic wave absorption layer 650 may be provided.
Abstract
Description
図1~図4を参照して、本発明の第1実施形態による光音響画像化装置100の構成について説明する。
次に、図1および図7を参照して、第2実施形態による光音響画像化装置200の構成について説明する。第2実施形態では、光音響画像化装置に、15Ω以上で、かつ、30Ω以下の特性インピーダンスを有する同軸ケーブルが設けられている。
Z=√(L/C)・・・(1)
次に、図8を参照して、第3実施形態による光音響画像化装置300の構成について説明する。第3実施形態では、プローブの2つの光源部と装置本体部とは、それぞれ1本ずつの同軸ケーブルにより接続されていた第1実施形態および第2実施形態による光音響画像化装置とは異なり、プローブの2つの光源部と装置本体部とは、それぞれ2本ずつ(複数)の同軸ケーブルにより接続されている。
次に、図9~図11を参照して、第4実施形態による光音響画像化装置400の構成について説明する。第4実施形態では、信号ケーブルと同軸ケーブルとは、プローブと装置本体部とに、別々に取り回されるように接続されていた第1~第3実施形態による光音響画像化装置とは異なり、信号ケーブルと同軸ケーブルとは、プローブと装置本体部とに、一体的に取り回されるように接続されている。
次に、図12を参照して、第5実施形態による光音響画像化装置500の構成について説明する。第5実施形態では、ケーブル502に、同軸ケーブル403と信号ケーブル404からなるケーブル群502aの外側を覆うシールド505aが設けられている。
まず、図13~図18を参照して、本発明の第6実施形態による光音響画像化装置600の構成について説明する。
以下、図21を参照して、本発明の第7実施形態による光音響画像化装置700の構成について説明する。
以下、図22を参照して、本発明の第8実施形態による光音響画像化装置800の構成について説明する。
3、31、32、203、231、232、303、403、431、432 同軸ケーブル
3a、431a、432a 内部導体
3c、431c、432c 外部導体
4、404、441、442 信号ケーブル
14 音響波検出部(検出部)
15、15a、17、17a、620 光源部
16 発光ダイオード素子(発光素子)
16a 半導体レーザ素子(発光素子)
16b 有機発光ダイオード素子(発光素子)
22、322、682、922 光源駆動部
22a、922a 電源部
22b、922b 信号生成部
100、200、300、400、500、600、700、800 光音響画像化装置
331 第1同軸ケーブル(同軸ケーブル)
332 第2同軸ケーブル(同軸ケーブル)
333 第3同軸ケーブル(同軸ケーブル)
334 第4同軸ケーブル(同軸ケーブル)
403a、404a シールド(第1シールド)
502a ケーブル群
505a シールド(第2シールド)
601a 放熱部
610a 第1筺体(筺体)
620a 発光素子
630 基板
630a 第1面
630b 第2面
631 配線
640 絶縁部材
650 電磁波吸収層
651 基板露出部
670 検出部
660 熱伝導部
Claims (20)
- 被検体に光を照射することが可能な発光素子(16、16a、16b、620a)と、
前記発光素子から前記被検体に照射された光が、前記被検体の内部の検出対象物により吸収されることにより発生する音響波を検出する検出部(14、670)と、
前記発光素子に電力を供給する電源部(22a、922a)と、前記発光素子が光を照射する状態と前記発光素子が光を照射しない状態とを制御するためのパルス照射信号を生成する信号生成部(22b、922b)とを含む、光源駆動部(22、322、682、922)が設けられている、装置本体部(2、2a、680)と、
前記発光素子と前記装置本体部とを接続する同軸ケーブル(3、31、32、203、231、232、303、331~334、403、431、432)を備え、
前記同軸ケーブルは、前記同軸ケーブルの外部導体(3c、431c、432c)が、前記光源駆動部の前記電源部に接続されているか、または、接地されているとともに、前記同軸ケーブルの内部導体(3a、431a、432a)が、前記光源駆動部の前記信号生成部に接続されている、光音響画像化装置(100、200、300、400、500、600、700、800)。 - 前記光源駆動部は、前記発光素子が光を照射する状態となるための前記パルス照射信号を生成する際に、前記同軸ケーブルに、10A以上のパルス状の電流を流すように構成されている、請求項1に記載の光音響画像化装置。
- 前記同軸ケーブルは、前記同軸ケーブルの特性インピーダンスが、30Ω以下になるように構成されている、請求項1に記載の光音響画像化装置。
- 前記同軸ケーブルは、前記同軸ケーブルの特性インピーダンスが、15Ω以上になるように構成されている、請求項3に記載の光音響画像化装置。
- 前記発光素子と前記装置本体部とは、複数本の前記同軸ケーブルにより接続されている、請求項1に記載の光音響画像化装置。
- 前記検出部により検出された前記音響波の信号に基づいて、前記音響波の画像化を行う画像化部と、
前記画像化部と前記検出部とに接続され、前記音響波の信号を伝達する信号ケーブル(4、404、441、442)とをさらに備え、
前記同軸ケーブルと前記信号ケーブルとは、一体となった状態で取り回されるように構成されている、請求項1に記載の光音響画像化装置。 - 前記同軸ケーブルまたは前記信号ケーブルのうちの少なくとも一方の外側を覆う第1シールド(403a、404a)をさらに備える、請求項6に記載の光音響画像化装置。
- 前記同軸ケーブルと前記信号ケーブルとは、一体となった状態で取り回されるケーブル群(502a)を形成しており、
前記ケーブル群の外側を覆う第2シールド(505a)をさらに備える、請求項6に記載の光音響画像化装置。 - 前記同軸ケーブルは、前記同軸ケーブルの外部導体が、前記光源駆動部の前記電源部に接続されているとともに、前記同軸ケーブルの内部導体が、前記信号生成部と接続されている、請求項1に記載の光音響画像化装置。
- 前記同軸ケーブルは、導体抵抗が0.5Ω/m以下になるように構成されている、請求項1に記載の光音響画像化装置。
- 前記発光素子を含む光源部(620)と、
第1面(630a)に前記光源部が配置されるとともに、前記第1面または前記第1面と反対側の第2面(630b)に配線(631)が配置される基板(630)と、
前記配線を前記基板の第2面側から覆うように設けられた電磁波吸収層(650)とをさらに備える、請求項1に記載の光音響画像化装置。 - 前記電磁波吸収層には、前記基板の第2面を露出させるための基板露出部(651)が形成され、
前記電磁波吸収層の前記基板露出部を介して、前記基板の第2面に接触するように配置され、前記基板の熱を放熱するための熱伝導部(660)をさらに備える、請求項11に記載の光音響画像化装置。 - 前記検出部を収容する筐体(610a)をさらに備え、
前記熱伝導部は、一方の端部側が前記基板の第2面に接触し、他方の端部側が前記筐体に接触するように構成されている、請求項12に記載の光音響画像化装置。 - 前記筺体は、放熱部(601a)を含み、
前記熱伝導部は、他方の端部側が前記放熱部に接続されるように構成されている、請求項13に記載の光音響画像化装置。 - 前記基板の第2面と、前記電磁波吸収層との間には、絶縁部材(640)が設けられている、請求項11に記載の光音響画像化装置。
- 前記発光素子を含む光源部(15、15a、17、17a、620)をさらに備え、
前記光源部と前記検出部とは隣接して配置されている、請求項1に記載の光音響画像化装置。 - 前記発光素子は、複数設けられており、
複数の前記発光素子は、直線状に配列されている、請求項1に記載の光音響画像化装置。 - 前記発光素子は、発光ダイオード素子(16)により構成されている、請求項1に記載の光音響画像化装置。
- 前記発光素子は、半導体レーザ素子(16a)により構成されている、請求項1に記載の光音響画像化装置。
- 前記発光素子は、有機発光ダイオード素子(16b)により構成されている、請求項1に記載の光音響画像化装置。
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US15/503,056 US20170231503A1 (en) | 2014-08-12 | 2015-07-03 | Photo-Acoustic Imaging Device |
EP15832033.3A EP3181057A1 (en) | 2014-08-12 | 2015-07-03 | Photo-acoustic imaging device |
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JP2014532520A (ja) * | 2011-11-02 | 2014-12-08 | セノ メディカル インストルメンツ,インク. | ハンドヘルド光音響プローブ |
JP2013208230A (ja) * | 2012-03-30 | 2013-10-10 | Fujifilm Corp | 超音波探触子および信号線の接続方法 |
JP2014039801A (ja) * | 2012-07-27 | 2014-03-06 | Fujifilm Corp | 音響信号検出用のプローブおよびそれを備えた光音響計測装置 |
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EP3181057A1 (en) | 2017-06-21 |
US20170231503A1 (en) | 2017-08-17 |
CN106659479A (zh) | 2017-05-10 |
JP6495296B2 (ja) | 2019-04-03 |
JPWO2016024449A1 (ja) | 2017-05-25 |
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