An optoacoustic imaging device

Abstract

The present invention discloses a photoacoustic imaging device, belonging to the technical field of photoacoustic imaging. It includes a transducer array and a bridge axis. The first bridge includes a first upper bracket and a first lower bracket; a head fixing structure is provided on the first upper bracket, and a leg fixing structure and a box body filled with a liquid medium are provided on the first lower bracket; after rotating the bridge axis to the first position, an optical fiber bundle array is fixed on the transducer array; the second bridge includes a second upper bracket and a second lower bracket; a light beam output component is provided on the second upper bracket, and a support fixing component is provided on the second lower bracket; after rotating the bridge axis to the second position, a thin film component is fixed at the bottom of the transducer array and a light transmissive component is fixed at the top of the transducer array; this solution realizes the switching of multiple imaging modes; a laser transmission system based on the optical fiber bundle array is used for whole body imaging, and top illumination is used for head imaging and local imaging; there is no mutual interference between the three irradiation methods and they can be used in the same set of systems.

Description

Technical Field

[0001] The present invention belongs to the technical field of photoacoustic imaging, and particularly relates to a photoacoustic imaging device with an integrated design of multiple imaging methods. Background Art

[0002] For photoacoustic imaging of animals, a dual-purpose mode is generally adopted, that is, it includes whole-body imaging and head (brain) imaging; the two modes have different illumination methods. When performing head imaging, illumination is required at the top of the animal; when performing whole-body imaging, illumination is required at the body position of the animal.

[0003] Currently, both modes have their own separate devices, each equipped with a separate photoacoustic imaging system; the different structural designs mentioned above require a large amount of space, making the operation cumbersome; at the same time, because two ultrasonic transducer imaging systems need to be equipped, the cost investment of enterprises is huge.

[0004] Regarding this, how to streamline the structure of the photoacoustic imaging device, especially how to integrate different imaging modes into a single device, has become the direction for current R & D engineers to overcome. Summary of the Invention

[0005] Aiming at the problems existing in the prior art, the present invention provides a photoacoustic imaging device. Through a clever structural design, this device integrates modes such as whole-body imaging and head imaging into a single device, and at the same time enables multiple modes to be applicable to a single transducer array.

[0006] The specific solution proposed by the present invention is as follows:

[0007] A photoacoustic imaging device, comprising

[0008] A transducer array;

[0009] A bridge shaft, which is arranged to be movable up and down relative to a base through a sliding seat; the bridge shaft is installed on the sliding seat and can rotate around its own axis;

[0010] A first bridge, including a corresponding first upper bracket and a first lower bracket; the first upper bracket and the first lower bracket are respectively sleeved and fixed on the top and bottom of the bridge shaft; the first upper bracket is provided with a head fixing structure, the first lower bracket is provided with a leg fixing structure and a box filled with a liquid medium; after rotating the bridge shaft to the first position, a fiber bundle array is fixed on the transducer array to complete whole-body imaging;

[0011] The second bridge includes a second upper bracket sleeved on the top of the bridge shaft; the second upper bracket is vertically arranged at 90° to the first upper bracket; a second lower bracket corresponding to the second upper bracket is also sleeved at the bottom of the bridge shaft; a beam output assembly is arranged on the second upper bracket, and a support fixing assembly is arranged on the second lower bracket; rotate the bridge shaft to the second position so that the transducer array is located between the support fixing assembly and the beam output assembly, and fix a film assembly at the bottom of the transducer array and a light-transmitting assembly at the top of the transducer array to complete head imaging.

[0012] Further, the fiber bundle array includes

[0013] A base, with locking members for fixing to the transducer array arranged around it;

[0014] An installation table, having a frustum structure and a large circular hole opened at the center; the installation table is coaxially fixed to the base;

[0015] A plurality of optical fibers, fixed on the installation table and arranged in a circular array along the central axis of the installation table; the light beams output by the plurality of optical fibers converge into an illumination area, and the center point of the illumination area is located on the central axis of the installation table.

[0016] Further, each of the optical fibers is inclined on the installation table such that the center point of the light beam illumination area is not on the plane formed by the output ends of the optical fibers.

[0017] Further, each of the optical fibers penetrates the installation table obliquely such that the center point of the illumination area is 4 mm lower than the central focus of the transducer array.

[0018] Further, a first limit block for fixing the whole-body imaging position and a second limit block for fixing the head imaging position are sleeved and fixed on the bridge shaft;

[0019] The first limit block and the second limit block have the same structure and both include a sleeved portion and a limit portion; the limit portion of the first limit block and the limit portion of the second limit block are arranged at 90°.

[0020] Further, a first end switch for first position monitoring and a second end switch for second position monitoring are arranged on the sliding seat; the first end switch and the second end switch have the same structure.

[0021] Furthermore, the first end switch and the second end switch are both mechanical switches; the first end switch and the second end switch both have switch buttons and elastic paddles are provided at the switch button positions; the bridge shaft is provided with a first resist block corresponding to the first end switch and a second resist block corresponding to the second end switch; when the bridge shaft rotates to the first position, the first resist block presses the elastic paddle on the first end switch to turn on the switch button of the first end switch; when the bridge shaft rotates to the second position, the second resist block presses the elastic paddle on the second end switch to turn on the switch button of the second end switch.

[0022] Furthermore, a protruding guide wheel is provided on the elastic pick.

[0023] Furthermore, the beam output assembly includes a connecting arm fixedly mounted on the second upper bracket and an illuminator mounted on the connecting arm, and the illuminator emits a laser beam toward the upward supporting fixing assembly.

[0024] Furthermore, the beam output assembly includes a connecting arm movably mounted on the second upper bracket and an illuminator mounted on the connecting arm, and the illuminator emits a laser beam obliquely toward the leg fixing structure.

[0025] The beneficial effects achieved by adopting this technical solution are:

[0026] In this solution, the entire device structure is redesigned to enable switching between multiple imaging modes. In a specific implementation case, a laser transmission system based on a fiber optic bundle array is used for whole-body (torso) imaging, while top illumination is used for head (brain) imaging and local imaging. The three illumination methods do not interfere with each other and can be used in the same system. Compared with the traditional solution of using two separate devices, the device structure proposed in this solution has been greatly optimized, making operation easier and greatly promoting the reduction of enterprise cost investment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a structural diagram of the whole body imaging when the bridge axis is in the first position.

[0028] Figure 2 The structural diagram of the transducer array.

[0029] Figure 3 This is a diagram of the matching structure between the base and the slide.

[0030] Figure 4 This is the assembly structure diagram between the bridge shaft and the first and second bridges.

[0031] Figure 5Structural diagram of the photoacoustic imaging device without a transducer array.

[0032] Figure 6 Structural diagram of the fiber bundle array.

[0033] Figure 7 Cross-sectional structural diagram of the fiber bundle array mounted on the transducer array.

[0034] Figure 8 Structural diagram of head imaging when the bridge axis is in the second position.

[0035] Figure 9 Cross-sectional structural diagram of head imaging.

[0036] Figure 10 Structural diagram of local imaging when the bridge axis is in the first position.

[0037] Figure 11 For Figure 5 Partial enlarged view at A in , showing the limit structure on the bridge axis.

[0038] Figure 12 Schematic structural diagram of the end switch.

[0039] Wherein: 10 base, 11 slide, 20 bridge axis, 21 first limit block, 22 second limit block, 23 first end switch, 24 second end switch, 30 first bridge, 31 first upper bracket, 32 first lower bracket, 40 second bridge, 41 second upper bracket, 42 second lower bracket, 43 beam output assembly, 44 support fixing assembly, 45 film assembly, 46 light transmission assembly, 100 reference fixing surface, 200 transducer array, 300 fiber bundle array, 301 base, 302 mounting table, 303 optical fiber, 431 connecting arm, 432 irradiator. Specific embodiments

[0040] The principles and features of the present invention will be described below in conjunction with the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0041] This embodiment provides a photoacoustic imaging device, which integrates the structures required for whole-body imaging, head imaging, and local imaging. Through a clever design of the structure of the device, the switching of three imaging modes (whole-body imaging, head imaging, and local imaging) is realized, so as to further achieve the purpose of convenient operation and reduction of enterprise cost input.

[0042] Specifically, refer to Figure 1 - Figure 5, the photoacoustic imaging device includes a base 10, a transducer array 200, a bridge shaft 20, a first bridge 30, and a second bridge 40. The base 10 is fixed on a reference fixing surface 100, and the reference fixing surface 100 provides stable support for the base 10. At the same time, the transducer array 200 is also fixed on the reference fixing surface 100 to ensure the stable operation of the transducer array 200.

[0043] A sliding seat 11 is installed on the base 10. The sliding seat 11 can slide up and down on the base 10. Specifically, the sliding seat 11 is driven by a driver, that is, the driver drives the sliding seat 11 to slide up and down on the base 10. The bridge shaft 20 is arranged on the sliding seat 11. The up and down sliding of the sliding seat 11 will cause the bridge shaft 20 to move up and down synchronously. At the same time, the bridge shaft 20 is movably connected to the sliding seat 11, that is, the bridge shaft 20 is installed on the sliding seat 11 and can rotate around its own axis. It can be understood that the bridge shaft 20 can follow up and down with the sliding seat 11, and at the same time, the bridge shaft 20 can also rotate around its own axis.

[0044] In this solution, the first bridge 30 includes a corresponding first upper bracket 31 and a first lower bracket 32. The first upper bracket 31 and the first lower bracket 32 are respectively sleeved and fixed on the top and bottom of the bridge shaft 20. At the same time, a head fixing structure is provided on the first upper bracket 31, and a leg fixing structure and a box body filled with a liquid medium are provided on the first lower bracket 32. After rotating the bridge shaft 20 to the first position, an optical fiber bundle array 300 is fixed on the transducer array 200 to complete whole-body imaging.

[0045] The first position here can be understood as the position for whole-body imaging. In the specific use process, first, the bridge shaft 20 should be adjusted up and down in the vertical direction by the driver so that the head fixing structure and the leg fixing structure are corresponding to the position of the transducer array 200. Then, rotate the bridge shaft 20 to the whole-body imaging position (i.e., the first position) so that the head fixing structure and the leg fixing structure are respectively on the upper and lower sides of the transducer array 200. Then, fix the optical fiber bundle array 300 on the transducer array 200, and use the optical fiber bundle array 300 to provide 360° illumination for the whole body imaging of the animal.

[0046] In the prior art (patent number: CN212438939U; patent name: An animal fixing device for an ultrasonic transducer array), the structures and specific usage methods of the head fixing structure, leg fixing structure, transducer array 200, and box body in this solution are introduced in detail, and the structures here are the same as those in the prior art and will not be repeated.

[0047] In this solution, see Figure 1 、 Figure 6 - Figure 7, In order to provide 360° unobstructed full-body illumination for animals, an optical fiber bundle array 300 is fixed on the transducer array 200. The specific structure of the optical fiber bundle array 300 includes a base 301, a mounting table 302, and multiple optical fibers 303; locking members for fixing to the transducer array 200 are provided around the base 301; that is, the base 301 is fixed on the transducer array 200 through the locking members; the mounting table 302 is coaxially fixed to the base 301; the mounting table 302 has a frustum structure and a large circular hole is provided at the center; multiple optical fibers 303 are fixed on the mounting table 302 and are arranged in a circular array along the central axis of the mounting table 302; the light beams output by the multiple optical fibers 303 converge into an illumination area, and the center point of the illumination area is located on the central axis of the mounting table 302.

[0048] By arranging the optical fibers 303 in a circular array on the mounting table 302, when performing full-body imaging on small animals, the optical fibers 303 in the circular array can provide comprehensive and unobstructed illumination. In cooperation with the use of the transducer array 200, the full-body imaging of the animal is clearer and there will be no distortion phenomenon.

[0049] In this embodiment, each optical fiber 303 is inclined on the mounting table 302 so that the center point of the illumination area is not on the plane formed by the output ends of the optical fibers 303; that is, it can be understood that the light beams emitted from the output ends of the optical fibers 303 form an illumination area, but the center point of the illumination area of the light beams is not located on the plane formed by the output ends of all the optical fibers 303, which is equivalent to that all the optical fibers 303 are not horizontally arranged, effectively avoiding the situation of direct shooting between the optical fibers 303.

[0050] In this solution, each optical fiber 303 is inclined to pass through the mounting table 302 so that the center point of the illumination area of the light beam is slightly lower than the central focus of the transducer array 200. That is, it can be understood that the center point of the illumination area formed by the optical fibers 303 is set about 4 mm lower than the central focus of the transducer array 200. When performing full-body imaging on small animals, the imaging accuracy can be effectively improved, and the full-body imaging of the small animals can be displayed more vividly in three dimensions, avoiding the situation of image shadows and image distortion.

[0051] In order to achieve the conversion between full-body imaging and head imaging, a second bridge 40 is also provided on the bridge axis 20; specifically, see Figure 4 - Figure 5 、 Figure 8 - Figure 9, the second bridge 40 includes a second upper bracket 41 sleeved on the top of the bridge shaft 20; wherein the second upper bracket 41 is vertically arranged at 90° to the first upper bracket 31; a second lower bracket 42 corresponding to the second upper bracket 41 is also sleeved at the bottom of the bridge shaft 20; a beam output assembly 43 is arranged on the second upper bracket 41, and a support fixing assembly 44 is arranged on the second lower bracket 42; rotate the bridge shaft 20 to the second position (i.e., the head imaging position) so that the transducer array 200 is located between the support fixing assembly 44 and the beam output assembly 43, and at the same time, a film assembly 45 is fixed at the bottom of the transducer array 200 and a light-transmitting assembly 46 is fixed at the top of the transducer array 200 to complete head imaging.

[0052] Simply understood, a first upper bracket 31 and a second upper bracket 41 are arranged at the top of the bridge shaft 20, and the first upper bracket 31 and the second upper bracket 41 are perpendicular to each other at 90°; similarly, the first lower bracket 32 and the second lower bracket 42 arranged at the bottom of the bridge shaft 20 are perpendicular to each other at 90°; through such an arrangement, while ensuring the fixed position of the transducer array 200, only by rotating the bridge shaft 20, the bridge shaft 20 can be arbitrarily switched between the first position (whole body imaging position) and the second position (head imaging position), and then corresponding components are installed on the transducer array 200, so as to complete the whole body imaging and head imaging of small animals.

[0053] The following will be described with specific embodiments:

[0054] Whole body imaging (see Figure 1 )

[0055] S1: Use the driver to adjust the bridge shaft 20 up and down, and then rotate the bridge shaft 20 to the first position, so that the transducer array 200 fixed on the reference fixing surface 100 is located between the head fixing structure and the leg fixing structure, and fix and install the fiber optic bundle array 300 on the transducer array.

[0056] S2: Anesthetize and fix the head of the small animal through the head fixing structure; then fix the legs of the small animal using the leg fixing structure; finely adjust the head fixing structure to keep the small animal slightly stretched.

[0057] S3: Start the driver to move the bridge shaft 20 in the vertical direction, and the fixed small animal gradually moves downward along the axis of the transducer array 200, so that the whole body of the small animal is gradually irradiated by the fiber optic bundle array 300, and cooperate with the transducer array 200 to realize the whole body imaging of the small animal.

[0058] Head imaging (see Figure 8 )

[0059] S1: Detach the fiber optic bundle array 300 on the transducer array 200, and then rotate the bridge shaft 20 to the second position so that the transducer array 200 is between the beam output component 43 and the support fixing component 44.

[0060] S2: Fix the film component 45 at the bottom of the transducer array 200 and fix the light-transmitting component 46 at the top of the transducer array 200.

[0061] S3: Fix the small animal on the support fixing component 44, start the beam output component 43 for illumination, and cooperate with the transducer array 200 to achieve imaging of the head of the small animal.

[0062] In this embodiment, refer to Figure 9 , the support fixing component 44 includes a telescopic adjusting rod, the bottom of which is fixed to the second lower bracket 42; a connecting plate is fixed to the top of the telescopic adjusting rod; the body support seat is rotatably connected to the connecting plate through a first pin shaft; the head mask is connected to the connecting plate through an adapter block; the adapter block and the connecting plate are rotatably connected through a second pin shaft; rotate the body support seat and the adapter block respectively to adjust the formed elevation angle.

[0063] Optionally, the body support seat includes a support block and a heating tile arranged on the support block, the heating tile is in an arc structure; a tail blocking block for limiting the tail of the animal is also arranged in the heating tile.

[0064] In the prior art (patent number: CN202120122098.3; patent name: A fixing device for animal experiments), the provided fixing device has the same structure as the support fixing component 44 of this solution. Its specific composition structure and action mode are introduced in detail therein, and will not be elaborated here.

[0065] In this solution, the film component 45 includes a first snap ring and a polyurethane film. The polyurethane film is attached to the lower end face of the transducer array 200, and the outer edge of the polyurethane film is fixed to the transducer array 200 through the first snap ring.

[0066] Optionally, the polyurethane film is in an arched structure, and the highest point of the polyurethane film coincides with the center point of the central light illumination area of the transducer array. Through such a structural setting, the small animal placed on the support fixing component 44, especially the head of the small animal, can be in the center position of the transducer array 200, ensuring more comprehensive head imaging and effectively avoiding the phenomenon of distortion.

[0067] In this solution, the light-transmitting component 46 includes a second snap ring and a transparent cover plate. The second snap ring fixes the transparent cover plate on the top of the transducer array 200.

[0068] At this point, the transducer array 200 forms a cavity under the sealed connection of the transparent cover plate and the polyurethane film, and the cavity is filled with liquid medium.

[0069] In the existing technology (patent number: 202022462538.8; patent name: A device for photoacoustic imaging of animal heads), a detailed description is given of the specific coordination and specific usage of the thin film component 45, the transparent component 46 and the transducer array. The technical solution adopted in this solution is consistent with it, so it will not be repeated here.

[0070] The beam output assembly 43 proposed in this solution includes a connecting arm 431 and an illuminator 432 mounted on the connecting arm 431; the connecting arm 431 is fixed on the second upper bracket 41 so that the light beam emitted by the illuminator 432 is collinear with the central axis of the transducer array 200, that is, the light beam emitted by the illuminator 432 can be irradiated along the central axis of the transducer array 200 onto the small animal fixed on the overhead support fixing assembly 44.

[0071] Optional, see Figure 10 The connecting arm 431 can be movably connected to the second upper bracket 41, that is, the connecting arm 431 is connected to the second upper bracket 41, and can be adjusted to any angle relative to the second upper bracket 41, so that the illuminator 432 can be adjusted arbitrarily within the spatial range; the adjustable illuminator 432 here can not only make the light beam better irradiate the brain of the small animal, but also realize local irradiation of the small animal.

[0072] The local irradiation here is only applicable to the whole-body imaging position; that is, when the bridge shaft 20 is in the first position, the position of the connecting arm 431 is adjusted so that the laser beam emitted by the irradiator 432 is obliquely directed toward the fixed structure of the leg, and finally irradiates a local area on the small animal (at this time, there is no need to install the fiber bundle array 300); compared with 360° irradiation of the whole body, local irradiation has more advantages when performing small-area imaging. This method can better utilize laser energy, thereby enhancing signal strength. Removing the photoacoustic signal in areas of no interest also simplifies the image reconstruction process and reduces image clutter.

[0073] It can be understood that this is the third imaging mode, namely local imaging; the specific imaging modes can be summarized as follows:

[0074] S1: Use the driver to adjust the bridge shaft 20 up and down, and then rotate the bridge shaft 20 to the first position, so that the transducer array 200 fixed on the reference fixing surface 100 is between the head fixing structure and the leg fixing structure.

[0075] S2: Anesthetize and fix the head of the small animal through the head fixation structure; then fix the legs of the small animal using the leg fixation structure; finely adjust the head fixation structure to keep the small animal slightly stretched.

[0076] S3: Adjust the connecting arm 431 so that the laser beam emitted by the irradiator 432 obliquely irradiates a local area of the small animal, and cooperate with the transducer array 200 to achieve local imaging of a small area of the small animal.

[0077] Optionally, a conventional fiber optic imaging arrangement is used in the irradiator 432 to maintain the Gaussian beam shape of the laser; this is because the generation of the photoacoustic signal comes from the gradient deposition of light energy, and correspondingly, it can also be generated by the edge of the beam and bring artifacts; here, the conventional fiber optic imaging arrangement is used to maintain the Gaussian beam shape of the laser mainly to reduce the artifacts at the beam edge.

[0078] In this solution, through reasonable structural design, three different imaging modes (i.e., whole-body imaging, head imaging, and local imaging) are integrated into a set of equipment. In particular, by designing the bridge axis 20 and cooperating with the components arranged on the bridge axis 20, the connection of whole-body imaging, head imaging, and local imaging can be effectively achieved.

[0079] To define the first position (whole-body imaging position) and the second position (head imaging position), in this solution, a first limit block 21 for fixing the whole-body imaging position and a second limit block 22 for fixing the head imaging position are sleeved and fixed on the bridge axis 20; specifically, see Figure 5 、 Figure 11 , the first limit block 21 and the second limit block 22 have the same structure and both include a socket part and a limit part; the socket part is used for socket fixing with the bridge axis 20, and the limit parts of the first limit block 21 and the second limit block 22 are arranged at 90°.

[0080] It can be understood that when the bridge axis 20 is rotated to the first position, at this time, the limit part of the first limit block 21 abuts against the slide seat 11 to prevent the bridge axis 20 from rotating excessively; when the bridge axis 20 is rotated to the second position, at this time, the limit part of the second limit block 22 abuts against the slide seat 11 to ensure that the rotation is in place.

[0081] Optionally, see Figure 11 - Figure 12 , in order to enable the externally connected electronic system (not shown) to accurately sense whether the bridge axis 20 is in the first position or the second position at this time; a first end switch 23 for monitoring the first position and a second end switch 24 for monitoring the second position are arranged on the slide seat 11; the first end switch and the second end switch have the same structure; the position of the bridge axis 20 can be accurately sensed by using the end switch.

[0082] The end switches here can be photoelectric induction switches or mechanical push-button switches. In this solution, to ensure that each rotation reaches the correct position and avoid the insensitivity of photoelectric induction switches, mechanical push-button switches are preferred.

[0083] That is, both the first end switch 23 and the second end switch 24 are mechanical switches; both the first end switch 23 and the second end switch 24 have switch buttons and elastic paddles are provided at the positions of the switch buttons; a first abutting block corresponding to the first end switch 23 and a second abutting block corresponding to the second end switch 24 are provided on the bridge shaft 20; when the bridge shaft 20 rotates to the first position, the first abutting block presses the elastic paddle on the first end switch 23 to open the switch button of the first end switch 23; similarly, when the bridge shaft 20 rotates to the second position, the second abutting block presses the elastic paddle on the second end switch 24 to open the switch button of the second end switch 24; by adopting a mechanical structure design, the first end switch 23 and the second end switch 24 are opened at the corresponding positions, so that the external electronic system can accurately obtain the position information of the bridge shaft 20 and perform signal switching of corresponding modes.

[0084] Optionally, a protruding guide wheel is provided on the elastic paddle. That is to say, the elastic paddle and the abutting blocks (the first abutting block and the second abutting block) do not have hard contact, but rolling contact is achieved by using the guide wheel. In this way, when the abutting block approaches and presses the elastic paddle, the elastic paddle is pressed by squeezing the guide wheel, and then the switch button can be opened; at the same time, the guide wheel rotates during the squeezing process to reduce friction.

[0085] Through the redesign of the entire device structure, this technical solution realizes the switching of three imaging modes (whole body imaging, head imaging, and local imaging); there is no mutual interference between multiple irradiation methods, and they can be used in the same set of systems. Compared with the traditional solution of using two sets of devices separately, the device structure proposed in this solution has been greatly optimized, making the operation more convenient, and at the same time, it has a great promoting effect on reducing the cost investment of enterprises.

[0086] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A photoacoustic imaging device, characterized in that, Comprising a transducer array (200); a bridge shaft (20), which is arranged to be vertically movable relative to a base (10) through a carriage (11); the bridge shaft (20) is mounted on the carriage (11) and can rotate around its own axis; a first bridge (30), comprising a correspondingly arranged first upper bracket (31) and a first lower bracket (32); the first upper bracket (31) and the first lower bracket (32) are respectively sleeved and fixed on the top and bottom of the bridge shaft (20); the first upper bracket (31) is provided with a head fixing structure, the first lower bracket (32) is provided with a leg fixing structure and a box body filled with a liquid medium; after rotating the bridge shaft (20) to a first position, a fiber bundle array (300) is fixed on the transducer array (200) to complete whole-body imaging; a second bridge (40), comprising a second upper bracket (41) sleeved on the top of the bridge shaft (20); the second upper bracket (41) is perpendicularly arranged at 90° to the first upper bracket (31); a second lower bracket (42) corresponding to the second upper bracket (41) is also sleeved on the bottom of the bridge shaft (20); the second upper bracket (41) is provided with a light beam output assembly (43), and the second lower bracket (42) is provided with a backrest fixing assembly (44); rotating the bridge shaft (20) to a second position such that the transducer array (200) is located between the backrest fixing assembly (44) and the light beam output assembly (43), a film assembly (45) is fixed at the bottom of the transducer array (200) and a light-transmitting assembly (46) is fixed at the top of the transducer array (200) to complete head imaging.

2. The photoacoustic imaging device according to claim 1, characterized in that, The fiber bundle array (300) comprises a base (301), with locking members for fixing to the transducer array (200) arranged around its perimeter; a mounting table (302), having a frustum structure and a large round hole opened at its center; the mounting table (302) is coaxially fixed to the base (301); a plurality of optical fibers (303), fixed on the mounting table (302) and arranged in a circular array along the central axis of the mounting table (302); the light beams output by the plurality of optical fibers (303) converge into an illumination area, and the center point of the illumination area is located on the central axis of the mounting table (302).

3. The photoacoustic imaging device according to claim 2, wherein Each of the optical fibers (303) is inclined on the mounting table (302) such that the center point of the illumination area is not in the plane formed by the output ends of the optical fibers (303).

4. The photoacoustic imaging device according to claim 3, wherein Each of the optical fibers (303) is inclined through the mounting table (302) such that the center point of the illumination area is 4 mm lower than the central focus of the transducer array (200).

5. A photoacoustic imaging device according to claim 1, characterized in that, A first limit block (21) for fixing the position of whole-body imaging and a second limit block (22) for fixing the position of head imaging are sleeved and fixed on the bridge shaft (20); The first limit block (21) and the second limit block (22) have the same structure and both comprise a sleeved portion and a limiting portion; the limiting portions of the first limit block (21) and the second limit block (22) are arranged at 90°.

6. The photoacoustic imaging device according to claim 5, wherein A first end switch (23) for monitoring a first position and a second end switch (24) for monitoring a second position are provided on the slide (11); the first end switch (23) and the second end switch (24) have the same structure.

7. The photoacoustic imaging device according to claim 6, wherein, The first end switch (23) and the second end switch (24) are both mechanical switches; the first end switch (23) and the second end switch (24) both have switch buttons and elastic paddles are provided at the switch button positions; the bridge shaft (20) is provided with a first resisting block corresponding to the first end switch (23) and a second resisting block corresponding to the second end switch (24); when the bridge shaft (20) rotates to the first position, the first resisting block presses the elastic paddle on the first end switch (23) so that the switch button of the first end switch (23) is turned on; when the bridge shaft (20) rotates to the second position, the second resisting block presses the elastic paddle on the second end switch (24) so that the switch button of the second end switch (24) is turned on.

8. The photoacoustic imaging device according to claim 7, wherein The elastic paddle is provided with a protruding guide wheel.

9. The photoacoustic imaging device according to claim 1, characterized in that, The beam output assembly (43) comprises a connecting arm (431) fixedly mounted on the second upper bracket (41) and an illuminator (432) mounted on the connecting arm (431), wherein the illuminator (432) emits a laser beam in the direction of the upward support fixing assembly (44).

10. A photoacoustic imaging device according to claim 1, wherein, The beam output assembly (43) comprises a connecting arm (431) movably mounted on the second upper bracket (41) and an illuminator (432) mounted on the connecting arm (431), wherein the illuminator (432) emits a laser beam obliquely toward the leg fixing structure.

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