CN108227014A - The detection device of human body metal material before a kind of inspection for MR - Google Patents
The detection device of human body metal material before a kind of inspection for MR Download PDFInfo
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- CN108227014A CN108227014A CN201810273205.5A CN201810273205A CN108227014A CN 108227014 A CN108227014 A CN 108227014A CN 201810273205 A CN201810273205 A CN 201810273205A CN 108227014 A CN108227014 A CN 108227014A
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/10—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils
Abstract
The present invention relates to it is a kind of for MR check before human body metal material detection device, including：Control core microcontroller, metal object detector, stepper motor, photoelectric sensor, D/A converter, signal amplifier, audible-visual annunciator, large-screen display；Stepper motor controls the movement of metal object detector, the metal object detector, photoelectric sensor, D/A converter, signal amplifier, audible-visual annunciator, large-screen display are both connected on core microcontroller, audible-visual annunciator, large-screen display are both connected on signal amplifier, and entire detection device is powered using power supply module.The present invention can be quickly detected the presence of metal object and accurately provide specific location information, and can fundamentally avoid using the unnecessary injury caused by human body of x-ray detection mode.
Description
Technical field
The present invention relates to a kind of detection devices of human metalloproteinase material, and in particular to a kind of to be quickly detected metal object
The presence of body simultaneously accurately provides specific location information, and human body will not be damaged is used for human body metal material before MR is checked
The detection device of material.
Background technology
The medical detection method high as a noninvasive "dead" radiation damage diagnosis efficiency, magnetic resonance (MR) have,
Energy unrestricted choice photography level, and can show the spatial distribution of reflection histoorgan metabolic function, physiology and Biochemical Information, so as to
Achieve the purpose that a variety of diseases of diagnosis.Favored by more and more medical personnels and those who are investigated.Magnetic resonance
(MR) structure of scanning machine can be divided into two large divisions by its function：(1) signal is generated, detects and is encoded；(2) data acquisition, place
Reason and image show, store.It can generate powerful and uniform main field.Patient is placed in main field during inspection, by
The coil that can generate radio-frequency pulse is placed at inspection position, and the second magnetic field is formed after energization.The frequency that coil generates radio-frequency pulse such as connects
Metal material that person of modern times's body carries in various ways (coin, metal hanger, underwear brassiere for making with metal material etc.) draws
Magnetic resonance imaging can be impacted by playing artifact：Metal material can generate electric current when human motion and displacement in MR checking processes
And fever.Magnetization can be generated, and occur with magnetic field into the ferrimagnet (ferromagnetic materia1) behind magnetic field
Effect, related with the ferromagnetic size of the field strength size and object of main field and gradient fields first, shape, matter secondly with object
Amount, the position and direction of plane are in relation to being finally the length with imaging time.If metal implant is nonferromagnetic in human body
The either suffered deflecting force or attraction is smaller is not enough to cause object of which movement and displacement or magnetic force in magnetic field
During interior fixed force when being implanted into less than metal, MR checks still safe and feasible.There is quite a few that can measure partially in oral cavity material
Turn power, but wherein only have Magnetized Material (magnetically activateddevice) to be only MR and check taboo.Silver amalgam,
There is no deflecting forces for silver-colored points etc..Cardiac replacement valve majority has ferromagnetism, can measure deflecting force, but the deflecting force is much smaller than heart
The active force that beating applies valve, thus patient remains to receive MR inspections in most cases.Blood vessel internal filter and stent
After several weeks are implanted into, once it is securely connect with vascular wall, it, will not be because of the powerful effect in magnetic field when checking even if there is ferromagnetism
It falls off.Materials most is fixed in bone surgery to be made of nonmagnetic alloy, can equally receive MR inspections.And early stage
Some can then seriously affect the effect of magnetic resonance imaging to reduce cost using the material that inferior stainless steel makes.However
Ferromagnetic aneurysm clip and hemostatic clamp cannot then do MR inspections certainly.In addition artificial cochlea or intraocular have ferromagnetic material
Patient can not do MR inspections.These metal materials cause artifact, also known as magnetic susceptibility artifact
(magneticsusceptibility artifact).It, which shows as local signal, which loses around low signal, high RST ring,
Frequency coding and select layer coding direction occur object form distortion.The reason is that：(1) cause local magnetic field uneven and spin proton
Dephasing position, the frequency and phase anomaly of (2) spin proton cause space orientation mistake, and (3) metal material is encouraged in radio-frequency pulse
Lower generation eddy current, it is uneven to will also result in local magnetic field, and this effect is relatively weak, but nonferromugnetic material generate it is pseudo-
The basis of shadow.So ferrimagnet and nonferromugnetic material can generate artifact, magnetic field intensity is bigger, ferrimagnet magnetization
Rate is bigger, and quality is bigger, and artifact is more serious.Artifact not only deforms topography on image, but also can be expanded at a distance,
Seriously affect picture quality.In summary：It must strictly be checked before being checked before carrying out MR and checking.To prevent metal object from depositing
In the influence to inspection, various metal detectors can only be higher to coin and this kind of magnetic intensity of metal on-hook currently on the market
Material is detected, the pendant weaker to some metal magnetics, underwear slide fastener and the magnetic implanted surgical material of use
But it is difficult to detect, so as to affect the effect and working efficiency of MR diagnosis.It is simple checked by staff inevitably have an omission can
Can, at the same when human body carry metal material (coin or key etc) by the strong magnetic field of MR equipment be drawn into it is scanning bed in
Coin is taken to different positions by face by the movement of bed, and the artifact of generation not only directly affects the diagnosis of MR, but also in many
In the case of directly result in MR equipment damage cause scanning can not continue.According to Pudong New District one, diformazan hospital not exclusively unites
The case that meter 2017 influences diagnosis because metal material brings into (wherein some is the family members that accompany patient's inspection) is more than 120
Example, causes machine halt trouble up to 30.One senior MR Maintenance Engineer is taught that because metal is drawn into MR magnets Nei Laiwei
Situation about repairing accounts for percent the 40 or so of repair total amount.The various forms for the unconscious carrying that human body carries is removed before MR is scanned
Metal material have become check preparation a very important job.
There are a series of reality such as missing inspection flase drop wrong report in serious analysis of the present invention market metal detection various products
Problem examines changing room and devises detection device pre-.Using high performance inductance sensor and microcontroller and peripheral integrated circuit
The metal detecting apparatus of optimum organization top-down scanning automatically is carried out to human body, so as to there are human body surfaces and body
Interior metal group material is accurately detected, compared with conventional detectors：Detection area working face has carried out special designing, detects
Area is big, sweep speed is fast, high sensitivity." N " cluster film coil metope built in frame-type metope is covered by active picture, is stood
The metal object for all kinds being hidden in human body can be detected by turning around in specified position, including jewellery, brassiere
A variety of materials for influencing normal MR scannings such as the tinsel on underwear.People is shown with intuitive way by large screen display
The metal decoration and internal metal material at each position of body.And it is plucked by what voice system prompting patient can handle
It removes.The novel high 180cm of detecting devices, wide 80cm.Have the scanned metal ornament positions of materials detected to show, be aided with LED
A variety of intelligent functions such as light flash alarm, voice warm tip.It is effective to prevent metal material from being checked after carrying in MR
In caused by adverse consequences.
Invention content
In view of the above-mentioned problems, it is a primary object of the present invention to provide a kind of presence that can be quickly detected metal object
And specific location information is accurately provided, and the detection for human body metal material before MR inspections that will not be damaged to human body
Device.
The present invention is to solve above-mentioned technical problem by following technical proposals：Human metalloproteinase before one kind checks for MR
The detection device of material, the detection device of human body metal material includes before the inspection for MR：Control core microcontroller, metal
Object detector, stepper motor, photoelectric sensor, D/A converter, signal amplifier, audible-visual annunciator, large-screen display；Step
Into the movement of motor control metal object detector, the metal object detector, photoelectric sensor, D/A converter, signal
Amplifier, audible-visual annunciator, large-screen display are both connected on core microcontroller, and audible-visual annunciator, large-screen display are all connected with
On signal amplifier, entire detection device is powered using power supply module.
In specific embodiments of the present invention, the patient of preparation MR inspections holds POS entrance and is equipped with gating device
Inspection chamber, using the movement of stepper motor control metal object detector, metal object detector is at a certain time interval
Whether Scanning Detction has the position on the patient body of metal object, in the presence of metal object is detected, the letter that will detect
Number input to photoelectric sensor, the signal of photoelectric sensor passes sequentially through D/A converter, after signal amplifier, passes to acousto-optic
Alarm, and show on large-screen display the position of metal object.
In specific embodiments of the present invention, the control core microcontroller is selected as AT90S8515 microcontrollers.
In specific embodiments of the present invention, the metal object detector is LDC1000 inductance/digital quantizer.
In specific embodiments of the present invention, the D/A converter is MAX536D/A conversion chips.
The positive effect of the present invention is：The detection of human body metal material fills before being checked provided by the present invention for MR
Putting mainly has following advantage：1st, the presence of metal object can be quickly detected and accurately provide specific location information,
2nd, metal object detector of the present invention utilizes the basic principle of electromagnetic induction, using have alternating current by coil, generate rapid
Changing magnetic field.This magnetic field energy can induct eddy current inside metal object.There is eddy current and can generate difference without eddy current
Signal strength, shaping is amplified by acquisition, shaping is further amplified in analog-to-digital conversion and driving circuit, is shown and restored by display screen
Position existing for metal.It is possible thereby to it fundamentally avoids with the unnecessary injury caused by human body of x-ray detection mode.
Description of the drawings
Fig. 1 is the overall structure diagram of the present invention.
Specific embodiment
Present pre-ferred embodiments are provided below in conjunction with the accompanying drawings, with the technical solution that the present invention will be described in detail.
Fig. 1 is the overall structure diagram in the present invention, as shown in Figure 1, before the inspection for MR provided by the invention
The detection device of human metalloproteinase material includes：Control core microcontroller, metal object detector, stepper motor, photoelectric sensor,
D/A converter, signal amplifier, audible-visual annunciator, large-screen display；Stepper motor controls the movement of metal object detector,
The metal object detector, photoelectric sensor, D/A converter, signal amplifier, audible-visual annunciator, large-screen display are equal
It is connected on core microcontroller, audible-visual annunciator, large-screen display are both connected on signal amplifier, and entire detection device uses
Power supply module is powered.
Prepare the patient that MR is checked and hold the POS into the inspection chamber for being equipped with gating device, gold is controlled using stepper motor
Belong to the movement of object detector, whether Scanning Detction has the trouble of metal object to metal object detector at a certain time interval
The signal detected in the presence of metal object is detected, is inputed to photoelectric sensor, photoelectric sensing by the position on person's body
The signal of device passes sequentially through D/A converter, after signal amplifier, passes to audible-visual annunciator, and shown on large-screen display
The position of metal object.
Control core microcontroller in the present invention is selected as AT90S8515 microcontrollers.
Metal object detector is LDC1000 inductance/digital quantizer in the present invention.
Metal object detector utilizes the basic principle of electromagnetic induction, using have alternating current by coil, generate rapid
Changing magnetic field.This magnetic field energy can induct eddy current inside metal object.There is eddy current and can generate difference without eddy current
Signal strength, shaping is amplified by acquisition, shaping is further amplified in analog-to-digital conversion and driving circuit, is shown and restored by display screen
Position existing for metal.It is possible thereby to it fundamentally avoids with the unnecessary injury caused by human body of x-ray detection mode.
D/A converter in the present invention is MAX536D/A conversion chips.
With AT90S8515, core, AT90S8515 are the low work(based on AVR enhancings performance, risc architecture to the present invention in order to control
Consumption, CMOS technology, eight-bit microcontroller (Enhanced RISC Microcontrollers).AVR cores are 32 general deposits
Device and abundant instruction set.32 registers are all connect with arithmetic and logical unit so that can be performed within a clock cycle
Two independent registers are accessed in one instruction.AT90S8515 has the Downloadable flash storage of 8K bytes, 512 bytes
RAM, 32 general purpose Is/O lines, 512 byte EEPROM (service life is 100,000 times), the flexibility timer with comparison pattern can
Programming serial UART, inside and out interrupt, programmable watchdog (WDT) timer with internal crystal oscillator；One is is downloaded
Program and the SPI serial ports designed and 2 battery saving modes that can be selected by software.Can also be the same similar to 51 series, make
During with external SRAM, the former exports as the address/data mouth being multiplexed, the latter as address, and DH also has other many functions.
In short, using AT90S8515 as embedded efficient microcontroller, without additional program storage, data storage, PWM controls
Special chip processed, the greatly simplified hardware of system, improves reliability and the safety of system.One is designed with AT90S8515
The metal object probe positioners group (hereinafter referred to as detector group) of a 80CmX200Cm using array scan control.
The present invention is by the use of LDC1000 inductance sensors as the critical piece of detection metal, and the probe of detector is using TI public affairs
LDC1000 inductance/digital quantizer is taken charge of as metal object detector.Its testing principle is to utilize electromagnetic induction principle.
Add an alternating current in coil, alternating magnetic field can be generated around coil, at this moment if there is metal object enters this magnetic field then
Vortex can be generated in metal object surface.It is like with the presence of another secondary coil.The coil conduct of LDC1000 in this way
Primary coil is formed a transformer.Since the mutual inductance of transformer acts on, in primary coil, this side can detect
The parameter of secondary coil.You can be allowed easily to connect MCU by SPI interface, it can be real by simple peripheral coil
Existing contactless inductance detection function.External metallization object and spatial relation coil connected LDC1000 can be tested.
Sensitivity is the most important parameters for the detectivity for weighing metal detector, and the preferable metal detector of performance ratio can detect
To 0.13 gram of gold, non-ferrous metal is more far short of what is expected than the detection difficulty of non-non-ferrous metal, the reason is that the magnetic field sense of non-ferrous metal
Answer poor ability.The characteristics of metal detector：Advanced DSP processing chips, hypersensitivity；Intelligent liquid-crystal display function, intelligence
Energy operating system, it is with better function；Stronger stability, superpower antijamming capability and adaptability；Meet HACCP systems,
QS systems and ISO system Specifications；Simple two-way signal detection circuit folding, accurate detection iron and nonferrous metal are miscellaneous
Matter；Simple two-way signal display function；Different inductions can be shown according to metal size；It is adapted to moist, high temperature and low temperature work
Make environment；Using stepless time adjustment motor, conveying tape speed is arbitrarily adjusted；Easy detachable rack, easy to clean, transmission is fast
It is prompt.
It is a completely new application that LDC1000, which is selected in metal detection, and inductance type transducer has simple in structure, measurement
The series of advantages such as the high zero point stability of precision and output power are larger, major defect are sensitivity, the linearity and measurement range
Mutually restrict.But the response of sensor own frequency is low, and discomfort carries out quickly dynamic and measures.But this is not inductance sensor
The shortcomings that most fatal, but conversion circuit is had to pass through, electricity could be exported, therefore for majority design application, it is complicated
Conversion circuit be only and hinder the widely available stumbling-block of inductance sensor.TI is selected to push away in the metal detector that we design
This inductance digital quantizer gone out then without complicated conversion circuit, directly exports detectable digital signal by LDC1000.
Higher resolution ratio：It can realize that submicron order is differentiated in the Application in Sensing of position by 16 resonant resistances and 24 inductance values
There is higher reliability can provide influence caused by non-contact sensing technology avoids contact with, can extend service life of equipment for rate.
LDC1000 has very high flexibility simultaneously：Sensor is allowed to be placed far from electronic product, in the position that PCB can not be placed.
The characteristics of LDC1000 can not be compared there are one other equipment, has very low system cost：Using inexpensive sensor and conduction
Target, without magnet and with extremely low system power dissipation, power consumption is not less than 8.5mW, under standby mode for power consumption when standard works
Sufficient 1.25mW.Therefore it is a kind of new way to present metallic test using inductance digital quantizer.It is designed as matrix form
Acquire wall, it is ensured that capture small metal material.Simultaneously in order to which inductance digital quantizer is made to be capable of providing better performance,
There is higher reliability to the WeChat ID that some are detected.It needs to carry out conditioning amplification to the sensor signal of access ADC conversions
Filtering process designs the amplification to WeChat ID using high cmrr, high-precision instrument amplifier INA326.INA326 is
One kind of TI companies production is used for precision instrument amplifier.It has unique topological structure, it can be achieved that positive and negative power limit of supply input/
Output, is highly suitable for single supply, low-power consumption and the application scenario of accurate measurement.It acts on the interference on the one hand reducing noise,
On the other hand the detectability to weak signal is improved.Improve the measurement accuracy and transfer efficiency of analog-digital converter.
It is U.S. MAXIN public affairs to carry out digital-to-analogue conversion MAX536D/A conversion chips using chip inlet MAX536 in the present invention
Take charge of the product released.Its 4 tunnel of Embedded independently can Synchronization Control 12 high-precision double buffering digital analog converters, have 3 lines
With 4 line serial line interfaces, saved and encapsulated using 16 feet, make its smaller that takes up space.OUTA, OUTB, OUTC and OUTD believe for simulation
Number output pin.REFAB and REFCD is respectively the reference voltage input terminal of AB and CD, and LDAC is loading DAC input signals, low
Level will be transmitted to input register content in corresponding DAC registers.SDI is serial data input, and SDO is serial data
Output terminal.CS is chip select input signal, and the maximum clock of the serial line interface of sequential MAX536 is 10MHz.Therefore CS bows l feet is low
After level must keep 20ns, it could start to receive data.LDAC feet are controlled by the I/O mouths of AT90S8515.The string of SDI pins
Row input data is sent into shift register by turn by the rising edge of serial clock SCK, is converted into parallel data.The data of input are complete
After portion enters shift register, CS is put as high level, and the parallel data of shift register output is filled into people using the rising edge of CS
In input register.Then, LDAC bow I feet low level when, directly by the number two of input register send D/A converter into
Row conversion.
In the present invention, metal detector needs to realize the automatic detecting function in the range of different height, and procedure selection is in Y
Vertical movement is carried out by stepper motor on axis, this requirement is detected to reach whole body.Stepper motor is selected in Y-axis
It is vertically moved, the two is combined the Surface scan that can be carried out in vertical range.The operation of stepper motor is controlled, this hair
Bright to have selected the integrated stepping motor controller that professional factory forms a complete production network, model-DKC-230A passes through AT90S8515
The P0 mouths of microcontroller and P3 mouthfuls are connected with stepper motor drive module, by positioning close to switch output low and high level control step
The direction of stepper motor movement, the speed and distance of AT90S8515P0-2 mouthfuls of output PWM wave control stepper motor movements are final to walk
Stepper motor drive module exports the operating of corresponding voltage driving stepper motor by A, B two-phase.While in order to prevent from anticipating
Operating is abnormal caused by outer, and the control displacement distance that detecting system is needed to be set to stepper motor, system passes through infrared sensor
Module is detected, and double control is realized by DKC-230A.And phonetic warning system while being shone by P0-1 mouthfuls of driving LED
Send out prompt tone.The hardware design present invention of metal detection alignment system needs to drive with LDC1000 inductance sensors and system
Dynamic stepper motor then requires power supply reliable and stable, is powered so directly selecting numerical control source of stable pressure.To the direct current of+24V
Voltage subsequently into reduction voltage circuit, reduces the voltage to+12V, 5V and 3.3V, to microcontroller and other module for power supply.
The selection present invention of position sensor selects OMROM reflective infrared photoelectrics switch, and distance of reaction is 1~50cm (adjustable), is felt
Mode is answered as diffusing reflection (nontransparent object), operating voltage is DC4.5~5.5V, and operating current 50mA, the way of output is that NPN is normal
It opens, response time 2ms.For the length that detection of straight lines motor stretches out, the position that linear motor can arbitrarily be set to move in this way
Range is put, to achieve the purpose that quickly to position.By comparing the performance of various motors, 42 stepper motors, stepping accuracy have been selected
Up to 5%.Direct current generator shaft a diameter of 5mm, motor diameter 42mm, motor length 67mm, rotating speed may be up to 4000 turns.
System needs preferable human-computer interaction function, thus in peripheral circuit using 55 cun of big screen LCDs with
The universaling I/O port of AT90S8515 microcontrollers is connected, and large-sized liquid crystal display is fully able to the requirement for meeting system, regards simultaneously
Wild open advantage.
Before the present invention is to preventing patient from doing MR inspections, because a variety of causes carries metal material, ornaments and pendant and self
Reason is studied and has been designed, and for problem state existing for current existing equipment, human body can be acquired in real time by, which devising, takes
Band metal information, obtained information by microcontroller is handled and generates multi-signal, realizes automatic alarm, prompting and display.And most
Expected design object is reached eventually.The realization of the present invention can reduce the equipment breakdown because accidentally entering interior initiation with metal, reduce
Artifact is scanned caused by human factor.Improve the working efficiency of diagnostician.Safeguard the normal operation of MR equipment, the present invention is not only
The preliminary examination that can be conveniently used in Medical Devices upgrades its module modification and can be used for subway, airport and high ferro entrance
Self-service safety check, improve working efficiency, it is true to solve the problems, such as that current these industry safety checks row group stands in a long queue, have
Good development prospect.
The basic principles, main features and the advantages of the invention have been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention, the claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (5)
1. a kind of detection device of human body metal material before inspection for MR, it is characterised in that：Human body before the inspection for MR
The detection device of metal material includes：Control core microcontroller, metal object detector, stepper motor, photoelectric sensor, D/A
Converter, signal amplifier, audible-visual annunciator, large-screen display；Stepper motor controls the movement of metal object detector, described
Metal object detector, photoelectric sensor, D/A converter, signal amplifier, audible-visual annunciator, large-screen display are all connected with
On core microcontroller, audible-visual annunciator, large-screen display are both connected on signal amplifier, and entire detection device uses power supply
Assembly power supply.
2. the detection device of human body metal material before the inspection according to claim 1 for MR, it is characterised in that：Prepare MR
The patient of inspection holds the POS and enters the inspection chamber for being equipped with gating device, using stepper motor control metal object detector
Mobile, whether Scanning Detction has portion on the patient body of metal object to metal object detector at a certain time interval
Position, in the presence of metal object is detected, inputs to photoelectric sensor, the signal of photoelectric sensor is successively by the signal detected
By D/A converter, after signal amplifier, audible-visual annunciator is passed to, and the position of metal object is shown on large-screen display
It puts.
3. the detection device of human body metal material before the inspection according to claim 1 for MR, it is characterised in that：The control
Core microcontroller processed is selected as AT90S8515 microcontrollers.
4. the detection device of human body metal material before the inspection according to claim 1 for MR, it is characterised in that：The gold
Category object detector is LDC1000 inductance/digital quantizer.
5. the detection device of human body metal material before the inspection according to claim 1 for MR, it is characterised in that：The D/
A converters are MAX536D/A conversion chips.
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| CN201810273205.5A CN108227014A (en) | 2018-03-29 | 2018-03-29 | The detection device of human body metal material before a kind of inspection for MR |
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| CN201810273205.5A CN108227014A (en) | 2018-03-29 | 2018-03-29 | The detection device of human body metal material before a kind of inspection for MR |
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