CN109157217A - A kind of malcoils localization method based on passive RFID - Google Patents
A kind of malcoils localization method based on passive RFID Download PDFInfo
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- CN109157217A CN109157217A CN201810755768.8A CN201810755768A CN109157217A CN 109157217 A CN109157217 A CN 109157217A CN 201810755768 A CN201810755768 A CN 201810755768A CN 109157217 A CN109157217 A CN 109157217A
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- 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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
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- G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
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Abstract
The invention discloses a kind of malcoils localization method based on passive RFID.In the present invention: being respectively equipped with signal emitting-source in the corner of station；Passive RFID electronic label is installed on malcoils；When passive RFID electronic label T enters reader sphere of action, passive RFID electronic label T feeds back the radiofrequency signal that reader is sent；Calculate the intensity of signal decaying and the relational expression of propagation distance；Coordinate system is established using signal emitting-source A point as origin；The space coordinate of passive RFID electronic label is calculated according to triangle polyester fibre algorithm.The present invention positions malcoils by passive RFID, in Magnetic resonance imaging resonance process, guarantees that coil has accessed NMR system；The carelessness because of operation doctor is avoided, coil does not have access system to lead to the system failure, and prevents from damaging patient；By the utilization of calculating and triangle polyester fibre algorithm to propagation model, the positioning accuracy of passive RFID is improved.
Description
Technical field
The invention belongs to technical field of software development, fixed more particularly to a kind of malcoils based on passive RFID
Position method.
Background technique
Magnetic resonance imaging is a kind of newer medical imaging technology, just formal for clinic from 1982 in the world.
Tissue is imaged using magnetostatic field and RF magnetic field in it, in imaging process, neither with electronics from radiation, without radiography
Agent is achieved with the clear image of high contrast.It can reflect that human organ is not normal and early stage is sick from human body intramolecule
Become.It is better than x-ray CT in many places.Although X-CT solves body effect's overlap problem, since the image of offer is still
It organizes that the physiological state information of human organ can not be provided to the spatial distribution image of X-ray absorption.When pathological tissues and week
Enclose normal tissue absorption coefficient it is identical when, valuable information can not be just provided.Only when pathological development is to changing organ
Form, position and itself increasing to can be just found when giving abnormal sensory.MR imaging apparatus is in addition to having x-ray CT's
Anatomic Types feature obtains except non-overlapping proton density body tomographic image, can also accurately measure by nuclear magnetic resonance principle
Atomic nucleus relaxation time T1 and T2 can come out the message reflection in tissue in relation to chemical structure.These information pass through meter
The image that calculation machine is rebuild is ingredient image (chemical structure picture), it has the ability the different tissues of same density and same tissue
Different chemical structures are shown by image and are characterized.This facilitates the grey matter and white matter distinguished in brain, to tissue necrosis, pernicious
Illness and the early diagnosis effect of degenerative disorders have great superiority, and the contrast of soft tissue is also more accurate.
Malcoils are the important components of NMR system, it typically serves to transmitting impulse interference wave machine and receives signal
Effect；In workflow, malcoils need access system that could be identified and operate normally, but because operation
The carelessness of doctor, coil are misplaced on station without access system sometimes, this will lead to the system failure and to patient
It damages.So wireless location malcoils just become extremely important.
Summary of the invention
The purpose of the present invention is to provide a kind of malcoils localization method based on passive RFID, by passive
RFID positions malcoils, in Magnetic resonance imaging resonance process, guarantees that coil has accessed nuclear magnetic resonance system
System；The carelessness because of operation doctor is avoided, coil does not have access system to lead to the system failure, and prevents from damaging patient；
By the utilization of calculating and triangle polyester fibre algorithm to propagation model, the positioning accuracy of passive RFID is improved.
In order to solve the above technical problems, the present invention is achieved by the following technical solutions:
The present invention is a kind of malcoils localization method based on passive RFID, is included the following steps:
Step 1, data acquisition；
Signal emitting-source A, B, C, a D is respectively equipped in four corners of station；It is equipped on malcoils
Passive RFID electronic label T；When the passive RFID electronic label T enters reader sphere of action, the passive RFID
Label T feeds back the radiofrequency signal that reader is sent；The reader handles feedback signal transmission to processor；
Step 2 establishes radio transmission model；
SS01, calculations for signal attenuation amount
The intensity of signal decaying is calculated according to the feedback signal of reader；The calculation formula of the signal attenuation are as follows:
It=20*log10fc+10*n*log10d+sf*(nf)-28 (1)
Wherein, It is the intensity of signal decaying in communication process, is carrier frequency, and n is signal strength coefficient, and d is to propagate
Distance, is coefficient between layers, and the coefficient between layers is determined by the number of floor levels between signal source and reception source；
SS01, propagation distance is calculated
The relationship between propagation distance d and signal attenuation It is obtained according to above formula；By above formula abbreviation:
a0=20*log10fc+sf*(nf)-28 (2)
a1=10*n (3)
Two formulas above are brought into (1) formula and are obtained:
It=a0+a1*log10d (4)
Above formula abbreviation is changed as following formula:
Step 3 calculates space coordinate
Coordinate system is established using signal emitting-source A point as origin；Wherein, the signal emitting-source A point coordinate is (x1, y1),
The signal emitting-source B point coordinate is (x2, y2), and the signal emitting-source B point coordinate is (x3, y3)；
The space coordinate of passive RFID electronic label T point is calculated according to triangle polyester fibre algorithm, calculation formula is respectively as follows:
Wherein, d1 is distance of the passive RFID electronic label T point to signal emitting-source A point, and d2 is passive RFID mark
T point is signed to the distance of signal emitting-source B point, d3 is distance of the passive RFID electronic label T point to signal emitting-source C point；
To obtain the three-dimensional coordinate (x, y, z) of passive RFID electronic label T point.
Preferably, the step 2 is handled with the calculating process in step 3 by cpu or single-chip microcontroller.
Preferably, calculated result is shown by display unit in step 3, and the display unit is LED display.
The invention has the following advantages:
The present invention positions malcoils by passive RFID, in Magnetic resonance imaging resonance process, protects
Card coil has accessed NMR system；The carelessness because of operation doctor is avoided, coil does not have access system to lead to the system failure,
And it prevents from damaging patient；By the utilization of calculating and triangle polyester fibre algorithm to propagation model, improve passive
The positioning accuracy of RFID.
Certainly, it implements any of the products of the present invention and does not necessarily require achieving all the advantages described above at the same time.
Specific embodiment
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's all other embodiment obtained without creative efforts belongs to the model that the present invention protects
It encloses.
The present invention is a kind of malcoils localization method based on passive RFID, is included the following steps:
Step 1, data acquisition；
Signal emitting-source A, B, C, a D is respectively equipped in four corners of station；It is equipped on malcoils
Passive RFID electronic label T；When passive RFID electronic label T enters reader sphere of action, passive RFID electronic label T feedback
The radiofrequency signal that reader is sent；Reader handles feedback signal transmission to processor；
Step 2 establishes radio transmission model；
SS01, calculations for signal attenuation amount
The intensity of signal decaying is calculated according to the feedback signal of reader；The calculation formula of signal attenuation are as follows:
It=20*log10fc+10*n*log10d+sf*(nf)-28 (1)
Wherein, It is the intensity of signal decaying in communication process, is carrier frequency, and n is signal strength coefficient, and d is to propagate
Distance, is coefficient between layers, and coefficient between layers is determined by the number of floor levels between signal source and reception source；
SS01, propagation distance is calculated
The relationship between propagation distance d and signal attenuation It is obtained according to above formula；By above formula abbreviation:
a0=20*log10fc+sf*(nf)-28 (2)
a1=10*n (3)
Two formulas above are brought into (1) formula and are obtained:
It=a0+a1*log10d (4)
Above formula abbreviation is changed as following formula:
Step 3 calculates space coordinate
Coordinate system is established using signal emitting-source A point as origin；Wherein, signal emitting-source A point coordinate is (x1, y1), signal
Emission source B point coordinate is (x2, y2), and signal emitting-source B point coordinate is (x3, y3)；
The space coordinate of passive RFID electronic label T point is calculated according to triangle polyester fibre algorithm, calculation formula is respectively as follows:
Wherein, d1 is distance of the passive RFID electronic label T point to signal emitting-source A point, and d2 is passive RFID mark
T point is signed to the distance of signal emitting-source B point, d3 is distance of the passive RFID electronic label T point to signal emitting-source C point；
To obtain the three-dimensional coordinate (x, y, z) of passive RFID electronic label T point.
Preferably, step 2 is handled with the calculating process in step 3 by cpu or single-chip microcontroller.
Preferably, calculated result is shown by display unit in step 3, and display unit is LED display.
It is worth noting that, included each unit is only drawn according to function logic in the above system embodiment
Point, but be not limited to the above division, as long as corresponding functions can be realized；In addition, each functional unit is specific
Title is also only for convenience of distinguishing each other, the protection scope being not intended to restrict the invention.
In addition, those of ordinary skill in the art will appreciate that realizing all or part of the steps in the various embodiments described above method
It is that relevant hardware can be instructed to complete by program, corresponding program can store to be situated between in a computer-readable storage
In matter, the storage medium, such as ROM/RAM, disk or CD.
Present invention disclosed above preferred embodiment is only intended to help to illustrate the present invention.There is no detailed for preferred embodiment
All details are described, are not limited the invention to the specific embodiments described.Obviously, according to the content of this specification,
It can make many modifications and variations.These embodiments are chosen and specifically described to this specification, is in order to better explain the present invention
Principle and practical application, so that skilled artisan be enable to better understand and utilize the present invention.The present invention is only
It is limited by claims and its full scope and equivalent.
Claims (3)
1. a kind of malcoils localization method based on passive RFID, which comprises the steps of:
Step 1, data acquisition；
Signal emitting-source A, B, C, a D is respectively equipped in four corners of station；It is equipped on malcoils passive
RFID electronic label T；When the passive RFID electronic label T enters reader sphere of action, the passive RFID electronic label T
Feed back the radiofrequency signal that reader is sent；The reader handles feedback signal transmission to processor；
Step 2 establishes radio transmission model；
SS01, calculations for signal attenuation amount
The intensity of signal decaying is calculated according to the feedback signal of reader；The calculation formula of the signal attenuation are as follows:
It=20*log10fc+10*n*log10d+sf*(nf)-28 (1)
Wherein, ItFor the intensity that signal in communication process is decayed, fcFor carrier frequency, n is signal strength coefficient, d be propagate away from
From sf*(nf) it is coefficient between layers, the coefficient between layers is determined by the number of floor levels between signal source and reception source；
SS01, propagation distance is calculated
Propagation distance d and signal attenuation I are obtained according to above formulatBetween relationship；By above formula abbreviation:
a0=20*log10fc+sf*(nf)-28 (2)
a1=10*n
(3)
Two formulas above are brought into (1) formula and are obtained:
It=a0+a1*log10d
(4)
Above formula abbreviation is changed as following formula:
Step 3 calculates space coordinate
Coordinate system is established using signal emitting-source A point as origin；Wherein, the signal emitting-source A point coordinate is (x1, y1), the letter
Number emission source B point coordinate is (x2, y2), the signal emitting-source B point coordinate is (x3, y3)；
The space coordinate of passive RFID electronic label T point is calculated according to triangle polyester fibre algorithm, calculation formula is respectively as follows:
Wherein, d1For passive RFID electronic label T point to the distance of signal emitting-source A point, d2For passive RFID electronic label T point
To the distance of signal emitting-source B point, d3For passive RFID electronic label T point to the distance of signal emitting-source C point；
To obtain the three-dimensional coordinate (x, y, z) of passive RFID electronic label T point.
2. a kind of malcoils localization method based on passive RFID according to claim 1, which is characterized in that step
Rapid two are handled with the calculating process in step 3 by cpu or single-chip microcontroller.
3. a kind of malcoils localization method based on passive RFID according to claim 1, which is characterized in that step
Calculated result is shown by display unit in rapid three, and the display unit is LED display.
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| CN201810755768.8A CN109157217A (en) | 2018-07-11 | 2018-07-11 | A kind of malcoils localization method based on passive RFID |
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| CN201810755768.8A CN109157217A (en) | 2018-07-11 | 2018-07-11 | A kind of malcoils localization method based on passive RFID |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110428888A (en) * | 2019-06-17 | 2019-11-08 | 邱洪钢 | A kind of label management method and system |
| CN115331408A (en) * | 2022-08-10 | 2022-11-11 | 河南中医药大学第一附属医院 | Kidney physiotherapy equipment and system |
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| CN101604397A (en) * | 2009-07-17 | 2009-12-16 | 公安部第三研究所 | Passive ultra-high frequency rfid indoor positioning system |
| CN103207375A (en) * | 2012-01-17 | 2013-07-17 | 西门子公司 | Mrt local coil position detection in an mrt system |
| US20140055148A1 (en) * | 2012-08-23 | 2014-02-27 | Stephan Biber | Identifying Transmission/Reception Coils of a Magnetic Resonance Imaging Scanner with the Aid of Electronically Readable Labels |
| CN105476635A (en) * | 2015-12-29 | 2016-04-13 | 沈阳东软医疗系统有限公司 | Positioning method and device of radio frequency coil in nuclear magnetic resonance imaging system |
| CN107356903A (en) * | 2017-06-28 | 2017-11-17 | 智坤（江苏）半导体有限公司 | Passive RFID localization method and device based on phase difference measurement |
-
2018
- 2018-07-11 CN CN201810755768.8A patent/CN109157217A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101604397A (en) * | 2009-07-17 | 2009-12-16 | 公安部第三研究所 | Passive ultra-high frequency rfid indoor positioning system |
| CN103207375A (en) * | 2012-01-17 | 2013-07-17 | 西门子公司 | Mrt local coil position detection in an mrt system |
| US20140055148A1 (en) * | 2012-08-23 | 2014-02-27 | Stephan Biber | Identifying Transmission/Reception Coils of a Magnetic Resonance Imaging Scanner with the Aid of Electronically Readable Labels |
| CN105476635A (en) * | 2015-12-29 | 2016-04-13 | 沈阳东软医疗系统有限公司 | Positioning method and device of radio frequency coil in nuclear magnetic resonance imaging system |
| CN107356903A (en) * | 2017-06-28 | 2017-11-17 | 智坤（江苏）半导体有限公司 | Passive RFID localization method and device based on phase difference measurement |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110428888A (en) * | 2019-06-17 | 2019-11-08 | 邱洪钢 | A kind of label management method and system |
| CN115331408A (en) * | 2022-08-10 | 2022-11-11 | 河南中医药大学第一附属医院 | Kidney physiotherapy equipment and system |
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Application publication date: 20190108 |