CN106901739B - Virtual reality stimulation device for functional magnetic resonance imaging - Google Patents
Virtual reality stimulation device for functional magnetic resonance imaging Download PDFInfo
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- CN106901739B CN106901739B CN201710171641.7A CN201710171641A CN106901739B CN 106901739 B CN106901739 B CN 106901739B CN 201710171641 A CN201710171641 A CN 201710171641A CN 106901739 B CN106901739 B CN 106901739B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/055—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/40—Detecting, measuring or recording for evaluating the nervous system
- A61B5/4058—Detecting, measuring or recording for evaluating the nervous system for evaluating the central nervous system
- A61B5/4064—Evaluating the brain
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/011—Arrangements for interaction with the human body, e.g. for user immersion in virtual reality
Abstract
The invention discloses a virtual reality stimulation device for functional magnetic resonance imaging, which comprises a virtual visual presentation component, an auditory presentation component, a motion detection feedback component and an operation control component. The device can effectively realize the presentation of the virtual environment with a large field angle, and the cooperation with the motion detection feedback assembly can ensure that the interaction such as visual angle rotation, motion control and the like can be carried out between a testee and the virtual environment, so that a virtual environment scene which is as close as possible to the real environment is provided, and the brain activity fMRI experiment result which is more close to the real environment can be obtained.
Description
Technical Field
The invention belongs to the field of medical instruments, and particularly relates to a virtual reality stimulation device for functional magnetic resonance imaging.
Background
Functional magnetic resonance imaging (fMRI) is an imaging technique that can be used to measure functional activation of brain regions, and is currently widely used in neurological and psychological studies. When a person receives various external stimuli, corresponding brain regions are activated in the brain, and different external stimuli can generate different activated brain regions. fMRI is mainly used to detect the location of functional areas in the brain and the degree of response to various stimuli; before a surgery that may involve a functional brain region, it is known in advance whether the corresponding functional region will be damaged by the fMRI technique. Meanwhile, fMRI technique is also one of the most important methods for non-invasive assessment and understanding of brain function.
When carrying out fMRI function magnetic resonance imaging experiment, need design corresponding external stimulus source according to the experiment purpose, through applying external stimulus to the quilt, record external stimulus in succession and apply the brain image of preceding (resting state) back (activation state), and then the processing obtains the brain area function activation picture that corresponds with external stimulus, consequently fMRI stimulation device is the essential auxiliary assembly who carries out nervous system function formation of image, provides very big convenience for nervous system function and psychological cognition research, plays important position in the fMRI system. Visual and auditory stimuli are the two most commonly used sources of stimulation, with the visual stimuli representing the vast majority of human neurosensory stimuli and more than 70% of the information entering the brain being received through the visual system, and thus visual research is an important aspect of brain science. Currently, many companies provide visual and auditory stimulation device products, but the traditional visual stimulation device can only provide graphic stimulation in a 2D plane, the stimulation mode is relatively single, and a more real visual stimulation environment cannot be provided, so that it is difficult to obtain a function activation image of a human brain region in the real environment, and the obtained fMRI research result has certain limitations.
Disclosure of Invention
In order to solve the technical problem, the invention provides a virtual reality stimulation device for functional magnetic resonance imaging, which combines a Virtual Reality (VR) technology with fMRI and is applied to the research of human brain function.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a virtual reality stimulation apparatus for functional magnetic resonance imaging, comprising: the virtual visual presentation component is used for providing a virtual visual scene for a human body; an auditory presentation component for providing auditory audio to a human body; the motion detection feedback assembly is used for detecting the motion state of the human body and forming feedback information to be transmitted to the operation control assembly; the input end of the operation control component is connected with the motion detection feedback component and receives feedback information, and the output end of the operation control component is respectively connected with the virtual visual presentation component and the auditory presentation component and provides visual stimulation signals for the virtual visual presentation component and auditory stimulation signals for the auditory presentation component; the virtual visual presentation component, the auditory presentation component and the motion detection feedback component are arranged in the magnet cavity, the magnet cavity is arranged in the magnet room, and the operation control component is arranged in the external equipment room.
The invention relates to a virtual reality stimulation device for functional magnetic resonance imaging, which comprises a virtual visual presentation component, an auditory presentation component, a motion detection feedback component and an operation control component. The operation control component generates a visual stimulation signal and an auditory stimulation signal which are used for generating a virtual reality scene, wherein the visual stimulation signal is transmitted to the virtual visual presentation component, and an immersive visual scene with a large 3D visual field angle is generated in front of the tested eyes; the visual stimulation signal reaches the auditory presenting device to generate a high-quality auditory effect at the tested ear, so that the presentation of the virtual reality environment stimulation at the tested end is realized; the motion detection feedback component receives feedback information given by the testee, such as: the hand motion information is transmitted back to the operation control assembly, and the operation control assembly immediately updates the stimulation of the virtual reality environment before the testee by analyzing the feedback information, so that the testee can deeply interact with the virtual reality environment.
The virtual reality stimulation device for functional magnetic resonance imaging can realize the presentation of various user-defined virtual reality scenes at the tested end, has good interaction function between the tested end and the virtual environment, and can meet the requirements of more fMRI experimental designs.
On the basis of the technical scheme, the following improvements can be made:
preferably, the auditory presentation component and the motion detection feedback component are respectively connected with a converter for photoelectric conversion through optical fibers, and the converter is connected with the operation control component through a connecting cable passing through the waveguide board;
the virtual visual presentation component passes through the waveguide board through a shielded cable and is connected with the operation control component;
the converter is arranged between the magnets, and the waveguide plate is arranged between the magnets and the external equipment.
By adopting the preferable scheme, the electromagnetic shielding effect among all parts is ensured, and the real effectiveness of the obtained experimental result is ensured.
Preferably, the virtual visual presentation component comprises: the subassembly is presented on the left side of eyeshade frame and setting up in the eyeshade frame and the subassembly is presented on the right side, and the subassembly is presented on the left side and the subassembly is presented on the right side and includes respectively: the OLED screen is used for displaying the virtual visual stimulation images, and the VR eyepiece is arranged in front of the OLED screen, and the OLED screen and the VR eyepiece are coaxially arranged.
By adopting the preferable scheme, a testee can directly observe the virtual visual stimulation image displayed on the OLED screen through the VR eyepiece, and the optimal virtual visual effect is obtained.
Preferably, the OLED screen and the VR eyepiece are arranged in a Faraday cage, and a metal mesh shielding observation window is arranged on one side, close to the VR eyepiece, of the Faraday cage.
By adopting the preferred scheme, the video stimulation electric signal, the OLED screen and the magnetic resonance scanning equipment are electromagnetically shielded, and the mutual interference between the virtual vision presenting device and the magnetic resonance scanning equipment is avoided.
Preferably, a first distance adjusting component for adjusting the distance between the left and right presenting components and a second distance adjusting component for adjusting the distance between the VR ocular lens and the two eyes of the testee are arranged on the eyeshade frame.
By adopting the preferable scheme, the first distance adjusting component adjusts the distance between the left and right presenting components so as to adapt to the distance between two eyes of different testees. The distance between VR eyepiece and the person under test's eyes is adjusted to second interval adjustment subassembly to adapt to different person under test's eye diopter, thereby make the person under test can observe the most clear virtual reality scene.
Preferably, the auditory presentation component comprises an earmuff frame and an audio generating piece arranged in the earmuff frame, and the earmuff frame is connected with the eyemuff frame.
Adopt above-mentioned preferred scheme, be in the same place ear muff frame and eye-shade frame integration, improve the integrated level of being equipped with, realize integration VR virtual reality head-mounted apparatus.
Preferably, the eyeshade frame comprises a frame body and a horn-shaped covering flange which is arranged on the frame body and extends outwards in an expanding mode, an elastic layer and a flexible layer are sequentially arranged on the inner side surface of the covering flange, an air cavity is arranged between the elastic layer and the flexible layer, and the air cavity is connected with external air equipment through an airflow hole formed in the covering flange.
By adopting the preferable scheme, the fitting degree of the virtual visual presentation component and the testee can be effectively improved, the testee is isolated from the real scene, and only the virtual real scene displayed in the virtual visual presentation device can be observed, so that a more real immersion virtual visual effect is obtained.
Preferably, the external air device is connected to the air flow hole through an air flow size adjusting device, and the air flow size adjusting device includes: the air flow seat is provided with a first through hole, and the outer side of the first through hole is provided with a regular polygonal sliding groove; the guide seat is arranged on one side of the airflow seat, a second through hole corresponding to the first through hole is formed in the guide seat, and a plurality of guide grooves are formed in the outer side of the second through hole in the guide seat; the baffle plates are arranged between the airflow seat and the guide seat, a first protruding part and a second protruding part are respectively arranged on the front and back opposite surfaces of each baffle plate, the first protruding part extends into the sliding groove, and the second protruding part extends into the guide groove; the driving device is connected with the airflow seat and the guide seat respectively, drives the airflow seat and the guide seat to rotate, and changes the positions of the separation blades, so that the exposed sizes of the first through hole and the second through hole are changed.
By adopting the preferable scheme, the external air equipment can perform blowing and air exhaust actions, and the air flow size adjusting device can effectively adjust the exposed sizes of the first through hole and the second through hole, so that the air flow size is adjusted, and the air content and the change rate in the air cavity are adjusted. The air flow size adjusting device disclosed by the invention can quickly adjust the exposed size of the through hole, and has the advantages of low noise, low power and low cost.
Preferably, a photosensitive sensor and/or a pressure sensor are arranged on the flexible layer, and the photosensitive sensor and/or the pressure sensor are connected with the airflow size adjusting device.
Adopt above-mentioned preferred scheme, detect virtual vision through light sensor and/or pressure sensor and present the laminating degree of subassembly and human being tested to better regulation air current size adjusting device makes human being tested and real scene keep apart, improves the effect of experiment.
Preferably, a plurality of isolation layers are arranged on one side of the flexible layer close to the air cavity, an inner cavity is formed between the isolation layers and the flexible layer, and one, two or more than two balls are arranged in the inner cavity.
Adopt above-mentioned preferred scheme, the ball can effectively massage the testee eye, improves the comfort level of wearing, and a plurality of inner chambers can distribute at the key point, and owing to there being the ball to assist at the key point, virtual vision presents subassembly and testee's laminating degree better.
Drawings
Fig. 1 is a schematic diagram of a virtual reality stimulation apparatus framework for functional magnetic resonance imaging according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a framework of a virtual visual presentation component according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a virtual visual presentation component and an auditory presentation component provided in an embodiment of the present invention.
Fig. 4 is a schematic diagram of an internal partial structure of a virtual visual presentation component and an auditory presentation component provided in an embodiment of the present invention.
Fig. 5 is a top view of a virtual visual presentation component and an auditory presentation component provided by an embodiment of the present invention.
Fig. 6 is a schematic diagram of a frame of a motion detection feedback assembly according to an embodiment of the present invention.
FIG. 7 is a partial cross-sectional view of an elastomeric layer, a flexible layer, and an air chamber provided by an embodiment of the invention.
Fig. 8 is a schematic structural diagram of an airflow seat according to an embodiment of the present invention.
Fig. 9 is a schematic structural view of an airflow seat and a baffle plate according to an embodiment of the present invention.
Fig. 10 is a schematic structural diagram of a guide seat according to an embodiment of the present invention.
FIG. 11 is a second partial cross-sectional view of the flexible layer, the elastic layer and the air chamber according to the embodiment of the invention.
Wherein: 101 magnet room, 102 equipment room, 103 operation room, 104 magnet room, 111 virtual visual presentation component, 112 auditory presentation component, 113 motion detection feedback component, 114 operation control component, 120 waveguide plate, 121 shielded cable, 122 optical fiber, 123 optical fiber, 124 converter, 125 connecting cable, 201OLED screen, 202VR eyepiece, 203 Faraday cage, 204 human eye, 205HDMI port, 301 eyeshade frame, 3011 frame body, 3012 wrapping flange, 302 metal mesh shielded viewing window, 303 first spacing adjustment component, 304 second spacing adjustment component, 401 track ball, 402 key handle, 403 motion glove, 411RS232 port, 412USB port, 501 elastic layer, 502 flexible layer, 503 air cavity, 504 isolation layer, 505 inner cavity, ball 506, 601 airflow seat, 602 first through hole, 603 sliding groove, 604 guide seat, 605 second through hole, 606 guide groove, 607, 608 first protrusion part, and, 609 a second projection.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
To achieve the objects of the invention, in some embodiments of a virtual reality stimulation apparatus for functional magnetic resonance imaging,
as shown in fig. 1, a virtual reality stimulation apparatus for functional magnetic resonance imaging includes a virtual visual presentation component 111, an auditory presentation component 112, a motion detection feedback component 113, and an operational control component 114.
The virtual visual presentation component 111 is used for providing a virtual visual scene for a human body; the auditory presentation component 112 is used to provide auditory audio to a human body; the motion detection feedback component 113 is used for detecting the motion state of the human body and forming feedback information to be transmitted to the operation control component 114; the input end of the operation control component 114 is connected with the motion detection feedback component 113 to receive feedback information, and the output end of the operation control component 114 is respectively connected with the virtual visual presentation component 111 and the auditory presentation component 112 to provide visual stimulation signals for the virtual visual presentation component 111 and auditory stimulation signals for the auditory presentation component 112.
The virtual visual presentation component 111, the auditory presentation component 112 and the motion detection feedback component 113 are arranged in the magnet cavity 104 for being worn at the corresponding part on the subject in an fMRI experiment, and the magnet cavity 104 is arranged in the magnet room 101. Wherein the operation control component 114 is placed in the operation room 103 between the external devices; a magnet chamber 104 is located within the magnet room 101. The virtual visual presentation component 111 is connected with the operation control component 114 through a shielded cable 121, the auditory presentation component 112 and the motion detection feedback component 113 are respectively connected with a converter 124 through optical fibers 122 and 123, and then connected with the operation control component 114 through a connecting cable 125, and the converter 124 is used for realizing photoelectric conversion. The shielded cable 121 and the connection cable 125 are each passed through the equipment room 102 via the waveguide board 120 provided between the magnet room 101 and the equipment room 102 of the external equipment room, and finally connected to the corresponding port of the operation control unit 114. It is noted that the magnet chamber 104 may be a large magnet, while the magnet room 101 is a shielded room, and the external equipment room includes the equipment room 102 for storing equipment and the operating room 103 for operation, but may also be a room or a plurality of rooms, which may be adjusted according to specific situations.
Electrical signals are transmitted in the shielded cable 121 and the connection cable 125, and optical signals are transmitted in the optical fibers 122, 123. To avoid interference of the transducer 124 and the connecting cable 125 with the magnetic resonance imaging apparatus, the transducer 124 is placed as far away from the magnet bore 104 as possible within the magnet room 101.
The operation control component 114 is provided with the set of operating software special for the VR virtual reality stimulation device, and can support user-defined operation, generate video and audio stimulation signals of different virtual reality scenes, and meet different requirements of fMRI experimental design. Wherein the visual stimulation signal reaches the virtual visual presentation component 111 through the shielded cable 121, and generates a 3D immersive visual scene with a large field angle in front of the eyes of the subject; the auditory stimulation signals reach the auditory presenting component 112 through the converter 124 and the optical fiber 122, so that a high-quality auditory effect is generated at the ear of the testee, and the presentation of the virtual reality environment stimulation at the tested end is realized; the motion detection feedback component 113 receives feedback information given by the subject, such as: the hand movement information is transmitted back to the operation control component 114 through the optical fiber 123 and the converter 124, and the operation control component 114 updates the virtual environment stimulus presented before the test in real time by analyzing the feedback information, so that the test can deeply interact with the virtual reality environment.
As shown in fig. 2, the virtual visual presenting component 111 is a schematic frame diagram for presenting the visual stimulation signal generated by the operation control component 114 in front of the eyes of the human subject, so that the human subject observes the virtual reality scene. The virtual visual presentation component includes: eyeshade frame 301 and the left and right presentation components disposed within eyeshade frame 301, the left and right presentation components include respectively: the device comprises an OLED screen 201 and a VR eyepiece 202, wherein the OLED screen 201 is used for displaying virtual visual stimulation images, the VR eyepiece 202 is arranged in front of the OLED screen 201, and the OLED screen 201 and the VR eyepiece 202 are coaxially arranged.
In order to make the tested person observe vivid high-definition virtual visual effect, two OLED screens 201 are preferably used to display video stimulation signals, two different images are generated, and the tested two eyes 204 can directly observe the images displayed on the OLED screens 201 through the VR eyepieces 202. Preferably, the resolution of a single OLED screen is 1080 × 1200, so that the combined resolution of 2160 × 1200 is achieved, and the dynamic refresh rate is larger than 85 Hz.
In order to avoid the OLED screen 201 from interfering with the magnetic resonance imaging apparatus, the OLED screen 201 and the VR eyepiece 202 need to be placed in the faraday cage 203 to achieve electromagnetic shielding of the OLED screen 201.
The shielded cable 121 of the OLED screen 201 passes through the waveguide board 120, passes through the equipment room 102 to the operation room 103, is connected to the HDMI port 205 of the operation control component 114, and receives a video electric signal.
As shown in fig. 3, the virtual visual presenting component 111 and the auditory presenting component are schematically configured, and the virtual visual presenting component 111 is designed by using a head-mounted eye mask, so that a human subject is isolated from a real scene, and only a virtual real scene displayed in the virtual visual presenting component 111 can be observed, thereby obtaining a more real immersive virtual visual effect.
Virtual visual presentation component 111 utilizes eye shield frame 301 to fixedly support internal structures.
Generally, the virtual visual presentation component 111 and the auditory presentation component 112 are two modules working independently, but the present application integrates the earmuff frame and the eyecup frame together, so as to improve the integration level of the device and realize an integrated VR virtual reality headset.
As shown in fig. 4 and 5, the internal partial structural diagrams of the virtual visual presentation component and the auditory presentation component are schematic. Two faraday cages 203 (the faraday cage on the right side in fig. 4 is not shown to show the internal structure) are arranged in the eyeshade frame 301, a VR eyepiece 202 and an OLED screen 201 are respectively arranged in each faraday cage 203, and a shielding cable 121 passes through the eyeshade frame 301 and the faraday cage 203, is connected with the OLED screen 201 and transmits video electric signals. The relative position between each OLED screen 201 and the corresponding VR eyepiece 202 is fixed and arranged coaxially; the faraday cage 203 is provided with a metal mesh shielding observation window 302 at one side close to the eyes of the testee, so that the left and right eyes of the testee can respectively observe two different visual stimulation images displayed on the OLED screen 201 through the VR eyepiece 202, and thus, an immersion virtual reality scene with a large 3D visual angle can be observed. VR eyepiece 202 preferably uses a Fresnel lens, which is lighter and thinner than conventional lenses.
A first distance adjusting component 303 for adjusting the distance between the left and right presenting components and a second distance adjusting component 304 for adjusting the distance between the VR eyepiece and the two eyes of the human subject are arranged on the eyeshade frame 301. The first spacing adjustment assembly 303 adjusts the distance between the left and right presenting assemblies to accommodate the distance between the eyes of different subjects. The second distance adjusting component 304 adjusts the distance between the VR eyepieces and the two eyes of the testee to adapt to the eye diopters of different testees, so that the testee can observe the clearest virtual reality scene.
The auditory presentation component 112 mainly adopts a special optical fiber type non-magnetic earphone for magnetic resonance to realize presentation of auditory stimulation signals at a tested end, and has a good noise shielding effect while meeting magnetic compatibility conditions.
The connection of the auditory presentation component 112 is through the waveguide board 120, through the equipment room 102 to the operator room 103, and is connected to the operation control component 114, and is mainly used to present various environmental sound effects in the virtual environment, and voice commands from the outside.
Because the head of being examined is fixed unable removal in the fMRI experimental process, consequently can't utilize the head to carry out the motion feedback operation, so this application sets up motion detection feedback subassembly 113 in the hand of testee and realizes the feedback function.
Fig. 6 is a schematic diagram of a framework of the motion detection feedback assembly 113, and the main motion detection feedback assembly 113 includes a trackball 401, a key handle 402 and a sports glove 403 to meet different requirements of fMRI experiment scene design. The trackball 401 can be used to complete the interactive actions of visual angle rotation and position movement in the virtual reality environment, the key handle 402 can be used to complete the interactive actions of key feedback and the like in the virtual reality environment, the sports glove 403 contains a plurality of position sensors, the actions of the tested hand can be accurately sensed, and the method can be used for the feedback of the hand movement in the more precise virtual reality environment, such as playing musical instruments, driving vehicles, operating instrument equipment and other scenes.
The trackball 401, the key handle 402 and the sports glove 403 are all designed to be compatible with magnetic resonance, do not contain any magnetic component, do not interfere with fMRI imaging, and are respectively connected to the converter 124 through the optical fiber 123, the converter 124 performs photoelectric conversion on the received optical fiber signal, then passes through the waveguide plate 120 through the connecting cable 125, passes through the equipment room 102, and finally reaches the RS232 port 411 or the USB port 412 of the operation control component 114 in the operation room 103, and feeds back the detected motion information to the operation control component 114.
To avoid the transducer 124 interfering with the operation of the magnetic resonance apparatus, the transducer 124 needs to be positioned within the magnet room 101 at a location remote from the magnet bore 104.
The operation control component 114 is provided with the operating software special for the VR virtual reality stimulation device, and the operation control component 114 receives the feedback information of the testee fed back by the motion detection feedback component 113, analyzes the feedback information, and immediately updates the virtual reality video and audio presented in front of the testee, so that the interaction function between the testee and the virtual reality environment is realized.
The virtual reality stimulation device for functional magnetic resonance imaging can realize the presentation of a 3D virtual environment with a large field angle, and can be matched with a motion detection device to realize the interaction of visual angle rotation, motion control and the like between a tested object and the virtual environment. The invention provides a method for combining VR virtual reality technology and fMRI to be used for researching human brain functions, and provides more real virtual environment interactive experience, so that the result of human brain area function activity distribution in different specific scenes under a real environment is obtained as close as possible.
As shown in fig. 7, in order to further optimize the implementation effect of the present invention, in other embodiments, the remaining features are the same, except that the eyeshade frame 301 includes a frame body 3011 and a flared covering flange 3012 disposed on the frame body 3011 and extending outward, an elastic layer 501 and a flexible layer 502 are sequentially disposed on the inner surface of the covering flange 3012, an air cavity 503 is disposed between the elastic layer 501 and the flexible layer 502, and the air cavity 503 is connected to an external air device (not shown) through an air flow hole (not shown) disposed on the covering flange 3012.
By adopting the above preferred scheme, the fitting degree of the virtual visual presentation component 111 and the testee can be effectively improved, so that the testee is isolated from the real scene, and only the virtual real scene displayed in the virtual visual presentation device can be observed, thereby obtaining a more real immersive virtual visual effect.
As shown in fig. 8 to 10, further, the outside air device is connected to the airflow hole through an airflow size adjusting means, the airflow size adjusting means including: the air flow seat 601 is provided with a first through hole 602, and a regular polygonal sliding groove 603 is arranged on the outer side of the first through hole 602; a guide seat 604 arranged at one side of the airflow seat 601, wherein a second through hole 605 corresponding to the first through hole 602 is arranged on the guide seat 604, and a plurality of guide grooves 606 are arranged at the outer side of the second through hole 605 on the guide seat 604; a plurality of blocking pieces 607 arranged between the airflow seat 601 and the guide seat 604, wherein a first protrusion 608 (not shown) and a second protrusion 609 are respectively arranged on the front and back opposite sides of the blocking pieces 607, the first protrusion 608 extends into the sliding groove 603, and the second protrusion 509 extends into the guide groove 606; and a driving device (not shown in the figure) respectively connected with the airflow seat 601 and the guide seat 604, wherein the driving device drives the airflow seat 601 and the guide seat 604 to rotate, and changes the position of the blocking sheet 607, so as to change the exposed size of the first through hole 602 and the second through hole 605.
By adopting the above preferred scheme, the external air device can perform blowing and air-extracting actions, and the air flow seat 601 and the guide seat 604 rotate to effectively adjust the exposed sizes of the first through hole 602 and the second through hole 605, thereby adjusting the size of the air flow, and adjusting the amount and the change rate of the air content in the air cavity 503. The air flow size adjusting device disclosed by the invention can quickly adjust the exposed sizes of the first through hole 602 and the second through hole 605, has low noise, low power and low cost, can effectively adjust the air content in the air cavity 503, and ensures the fitting degree of the virtual visual presentation component 111 and the testee.
In order to further optimize the implementation effect of the present invention, in other embodiments, the rest features are the same, except that a photosensitive sensor and/or a pressure sensor is provided on the flexible layer 502, and the photosensitive sensor and/or the pressure sensor are connected with the airflow size adjusting device.
Further, the degree of fitting of virtual visual presentation component 111 and the human subject is detected through a photosensitive sensor (not shown in the figure) and/or a pressure sensor (not shown in the figure), so that the size of the air flow can be adjusted better, the human subject is isolated from a real scene, and the experimental effect is improved.
As shown in fig. 11, in order to further optimize the implementation effect of the present invention, in other embodiments, the remaining features are the same, except that a plurality of isolation layers 504 are disposed on one side of the flexible layer 502 close to the air cavity 503, an inner cavity 505 is formed between the isolation layers 504 and the flexible layer 502, and one, two or more balls 506 are disposed in the inner cavity 505.
Adopt above-mentioned preferred scheme, ball 506 can effectively massage the testee eye, improves the comfort level of wearing, and a plurality of inner chambers 505 can distribute at the key point, and owing to there is ball 506 to assist at the key point, virtual vision presents subassembly 111 and testee's laminating degree better.
The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many variations and modifications can be made without departing from the inventive concept of the present invention, which falls into the protection scope of the present invention.
Claims (7)
1. A virtual reality stimulation apparatus for functional magnetic resonance imaging, comprising:
a virtual visual presentation component for providing a virtual visual scene for a human body, the virtual visual presentation component comprising: the eyeshade comprises an eyeshade frame, a left presenting component and a right presenting component, wherein the left presenting component and the right presenting component are arranged in the eyeshade frame;
an auditory presentation component for providing auditory audio to a human body;
the motion detection feedback assembly is used for detecting the motion state of the human body and forming feedback information to be transmitted to the operation control assembly;
the input end of the operation control component is connected with the motion detection feedback component to receive the feedback information, and the output end of the operation control component is respectively connected with the virtual visual presentation component and the auditory presentation component to provide visual stimulation signals for the virtual visual presentation component and auditory stimulation signals for the auditory presentation component;
the virtual visual presentation component, the auditory presentation component and the motion detection feedback component are arranged in a magnet cavity, the magnet cavity is arranged in a magnet room, and the operation control component is arranged in an external device room;
the auditory presentation assembly comprises an earmuff frame and an audio generating piece arranged in the earmuff frame, and the earmuff frame is connected with the eyemuff frame;
the eyeshade frame comprises a frame body and a horn-shaped covering flange which is arranged on the frame body and extends outwards in an expanding manner, an elastic layer and a flexible layer are sequentially arranged on the inner side surface of the covering flange, an air cavity is arranged between the elastic layer and the flexible layer, and the air cavity is connected with external air equipment through an airflow hole arranged on the covering flange;
the outside air device is connected to the airflow hole through an airflow size adjusting device, and the airflow size adjusting device includes:
the air flow seat is provided with a first through hole, and the outer side of the first through hole is provided with a regular polygonal sliding groove;
the guide seat is arranged on one side of the airflow seat, a second through hole corresponding to the first through hole is formed in the guide seat, and a plurality of guide grooves are formed in the outer side of the second through hole in the guide seat;
the baffle plates are arranged between the airflow seat and the guide seat, a first protruding part and a second protruding part are respectively arranged on the front and back opposite surfaces of each baffle plate, the first protruding part extends into the sliding groove, and the second protruding part extends into the guide groove;
and the driving device is respectively connected with the airflow seat and the guide seat, drives the airflow seat and the guide seat to rotate, and changes the position of the baffle plate, thereby changing the exposed sizes of the first through hole and the second through hole.
2. The virtual reality stimulation device for functional magnetic resonance imaging according to claim 1, wherein the auditory presentation component and the motion detection feedback component are respectively connected with a converter for photoelectric conversion through an optical fiber, and the converter is connected with the operation control component through a waveguide board through a connecting cable;
the virtual visual presentation component is connected with the operation control component through the waveguide board by a shielded cable;
the converter is arranged between the magnets, and the waveguide plate is arranged between the magnets and the external equipment.
3. The virtual reality stimulation apparatus for functional magnetic resonance imaging according to claim 1 or 2, wherein the left and right presenting components each comprise: the OLED screen is used for displaying virtual visual stimulation images and the virtual reality eyepiece is arranged in front of the OLED screen, and the OLED screen and the virtual reality eyepiece are coaxially arranged.
4. The virtual reality stimulation device for functional magnetic resonance imaging according to claim 3, wherein the OLED screen and the virtual reality eyepiece are arranged in a Faraday cage, and a metal mesh shielding observation window is arranged on the Faraday cage at a side close to the virtual reality eyepiece.
5. The virtual reality stimulating device for functional magnetic resonance imaging according to claim 4, wherein a first distance adjusting component for adjusting the distance between the left and right presenting components and a second distance adjusting component for adjusting the distance between the virtual reality eyepieces and the two eyes of the testee are arranged on the eyeshade frame.
6. The virtual reality stimulation device for functional magnetic resonance imaging according to claim 1, wherein a light sensor and/or a pressure sensor is provided on the flexible layer, and the light sensor and/or the pressure sensor is connected with the airflow size adjustment device.
7. The virtual reality stimulation device for functional magnetic resonance imaging according to claim 6, wherein a plurality of isolation layers are provided on the side of the flexible layer adjacent to the air chamber, an inner chamber is formed between the isolation layers and the flexible layer, and one or more than two balls are provided in the inner chamber.
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| CN110192861A (en) * | 2019-06-14 | 2019-09-03 | 广州医科大学附属肿瘤医院 | A kind of intelligence auxiliary brain function real-time detecting system |
| CN113407024B (en) * | 2021-05-25 | 2022-10-11 | 四川大学 | Evidence display and switching method and device for court trial virtual reality environment |
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