CN104000589B - The localization method of a kind of magnetic resonance imaging system and positioner - Google Patents
The localization method of a kind of magnetic resonance imaging system and positioner Download PDFInfo
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- CN104000589B CN104000589B CN201310061082.6A CN201310061082A CN104000589B CN 104000589 B CN104000589 B CN 104000589B CN 201310061082 A CN201310061082 A CN 201310061082A CN 104000589 B CN104000589 B CN 104000589B
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Abstract
The invention discloses localization method and the positioner of a kind of magnetic resonance imaging system, the localization method of wherein said magnetic resonance imaging system, including, gather the image of detected object；Show described image；Identify position to be detected in the displayed image；By controlling the movement of the sick bed of described magnetic resonance imaging system, the position to be detected identified is transported to described magnetic field center.Localization method according to the present invention and positioner, avoid use generating laser thus improve the magnetic resonance imaging system safety for detected object (patient), and simple to operate without operator's (doctor) Non-follow control thus improve efficiency and accuracy.
Description
Technical field
The present invention relates to magnetic resonance imaging system technical field, be specifically related to the localization method of a kind of magnetic resonance imaging system
And positioner.
Background technology
Nuclear magnetic resonance (Magnetic Resonance Imaging, MRI) utilizes magnetic resonance phenomenon to carry out imaging
A kind of technology.The hydrogen that the principle of magnetic resonance phenomenon is widely present in specifically including that the atomic nucleus comprising odd number proton, such as human body
Atomic nucleus, its proton has spin motion, and just as a small magnet, and the spin axis of these small magnets does not has certain rule
Rule, if applying exterior magnetic field, these small magnets will be rearranged by the magnetic line of force of exterior magnetic field, is specially and is being parallel to or instead
It is parallel to the both direction arrangement of the exterior magnetic field magnetic line of force, the above-mentioned direction being parallel to the exterior magnetic field magnetic line of force is referred to as positive longitudinal
Axle, is referred to as negative longitudinal axis by the above-mentioned direction being antiparallel to the exterior magnetic field magnetic line of force；Atomic nucleus only has longitudinal magnetization component, should
Longitudinal magnetization component not only has direction but also have amplitude.By radio frequency (Radio Frequency, the RF) pulse excitation of characteristic frequency
The atomic nucleus being in exterior magnetic field, makes these nuclear spin axiss deviate positive longitudinal axis or negative longitudinal axis, produces resonance, this
It it is exactly magnetic resonance phenomenon.After the above-mentioned nuclear spin axis being excited deviates positive longitudinal axis or negative longitudinal axis, this atomic nucleus
Just it is provided with component of transverse magnetisation.After stopping launching radio-frequency pulse, the atomic nucleus being excited launches echo-signal, the energy that will absorb
Amount discharges the most in the form of an electromagnetic wave, and its phase place and energy level all return to the state before exciting, and is launched by atomic nucleus
Image can be rebuild through further process such as space encodings with ripple signal.
In magnetic resonance imaging system, the position to be detected of detected object should be placed on magnetic field center thus reach optimal
Imaging effect, therefore before carrying out nuclear magnetic resonance, needs to calculate the distance between position to be detected and magnetic field center, then
Move this distance by the sick bed of control magnetic resonance imaging system thus be intended to detect position and be placed on magnetic field center.Namely
Say how to determine that the distance between position to be detected and magnetic field center is those skilled in the art's technical issues that need to address.
In the prior art, generating laser is used to solve above-mentioned technical problem.The positioner that generating laser is constituted
The localization method carried out includes three steps: first, is moved by sick bed and is generally in below generating laser to position to be detected
Position；Secondly, open generating laser, and sick bed is moved be in the position immediately below generating laser to position to be detected
Put；Finally, close generating laser, sick bed is moved a fixed range, i.e. level between generating laser and magnetic field center
Distance so that position to be detected is in magnetic field center.
But, the defect of technique scheme is, one, location during, laser likely hurts patient or doctor
Raw eyes；Two, the process of location includes the step such as coarse adjustment and fine tuning, and needs doctor's manual operation in operation room sick
Bed, the process therefore positioned is relatively complicated and accuracy is also difficult to ensure that.
Summary of the invention
For above-mentioned technical problem, the purpose of the embodiment of the present invention is to provide the location side of a kind of magnetic resonance imaging system
Method, including, gather the image of detected object；Show described image；Identify position to be detected in the displayed image；By control
Make the movement of the sick bed of described magnetic resonance imaging system, the position to be detected identified is transported to described magnetic field center.
In one embodiment of the invention, the described position to be detected is transported to described magnetic field center, including, root
According to position in described image of the ratio of described image, described position to be detected and the magnetic field of described magnetic resonance imaging system
The position at center, estimates the distance of position to be detected and the described magnetic field center identified.
In one embodiment of the invention, the described position to be detected is transported to described magnetic field center, including, chase after
Position in described image, the position to be detected that track is identified through a precalculated position and is being moved from described precalculated position
One fixed range arrives at described magnetic field center.
In one embodiment of the invention, position in described image, the described position to be detected is described detection
The geometric center at position or specified location in user.
The purpose of the embodiment of the present invention also resides in the positioner of a kind of magnetic resonance imaging system, including an image acquisition part
Divide, a display part, an identification division and control part, wherein, described image acquisition part, for gathering detected object
Image and by described image transmitting to described display part；Described display part, is used for showing described image；Described mark part
Point, for identifying position to be detected in the displayed image；Described control part, for by controlling described nuclear magnetic resonance
The movement of the sick bed of system, is transported to described magnetic field center by the position to be detected identified.
In one embodiment of the invention, described control part also includes an evaluation unit, described evaluation unit, uses
In becoming according to position in described image of the ratio according to described image, the position to be detected that identified and described magnetic resonance
As the position of the magnetic field center of system, estimate the distance of position to be detected and the described magnetic field center identified.
In one embodiment of the invention, described control part also includes a tracing unit, described tracing unit, uses
In following the trail of position in described image, the position to be detected identified through a precalculated position and from described precalculated position
A mobile fixed range arrives at described magnetic field center.
In one embodiment of the invention, described precalculated position is the underface of described image acquisition part.
In one embodiment of the invention, position in described image, the described position to be detected is described detection
The geometric center at position or specified location in user.
The embodiment of the present invention also provides for a kind of magnetic resonance imaging system, including any of the above-described positioner.
It can be seen that localization method according to a particular embodiment of the invention and positioner,.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the localization method of the first specific embodiment according to the present invention.
Fig. 2 is the schematic diagram of the localization method of the second specific embodiment according to the present invention.
Fig. 3 is the schematic diagram of positioner according to an embodiment of the invention.
Fig. 4 is the display part institute of the positioner of the first specific embodiment according to the present invention and the second specific embodiment
The schematic diagram of display image.
Detailed description of the invention
In order to make the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below illustrate and the present invention is implemented
Example is described in further detail.
In order to solve the problem proposed in background technology, the present invention proposes.
Specifically, the present invention:
1. utilizing video camera and display (or touch screen) to substitute generating laser, wherein video camera is arranged on above sick bed
And display (or touch screen) be arranged on the guidance panel of magnetic resonance imaging system or control between main frame on；
2. camera acquisition detected object (patient) image on one's sick bed, operator (doctor) display (or touch
Touch screen) upper selection position to be detected, then control parts by follow the tracks of or the mode such as estimation be automatically intended to test section displacement move to
Magnetic field center.
Localization method according to a particular embodiment of the invention and positioner, it is to avoid use generating laser thus improve
The magnetic resonance imaging system safety for detected object (patient), and simple to operate manual without operator (doctor)
Control thus improve efficiency and accuracy.
First specific embodiment
The localization method of the first specific embodiment according to the present invention includes: gather the image of detected object；Display is described
Image；Identify position to be detected in the displayed image；By controlling the movement of the sick bed of described magnetic resonance imaging system, will
The position to be detected identified is transported to described magnetic field center.Fig. 1 is the location side of the first specific embodiment according to the present invention
The schematic diagram of method, Fig. 3 is the schematic diagram of positioner according to an embodiment of the invention, and Fig. 4 is the first tool according to the present invention
The schematic diagram of the shown image of display part of the positioner of body embodiment and the second specific embodiment.
As shown in figures 1 and 3, video camera 101 He is included according to the positioner 100 of first specific embodiment of the present invention
Display 102, video camera 101 is used for gathering the image of detected object (patient) and by described image transmitting to display 102,
Display 102 is used for showing described image, and wherein, video camera 101 is installed on above sick bed, and display 102 may be mounted at magnetic altogether
At the guidance panel of imaging system of shaking (as shown in Figure 3), it is also possible to be arranged on the main frame of magnetic resonance imaging system.
Positioner 100 also includes identification division and controls part (not shown), and identification division is at shown figure
Position 201 to be detected is identified in Xiang；Control the part movement for the sick bed by controlling described magnetic resonance imaging system, by institute
The position to be detected of mark is transported to described magnetic field center 202.
In first specific embodiment of the present invention, video camera 101 gathers the image of detected object 200, and by this image
Transmission is to display 102；Display 102 shows the image of the detected object 200 that video camera 101 gathered, and as shown in Figure 4, takes the photograph
The image of the detected object 200 gathered as device 101 shows on the display 102, and this image includes detected object whole body, sick bed
Magnet with magnetic resonance imaging system；On this image, identification division is utilized can to define position 201 to be detected, such as Fig. 4 institute
Show, wherein identification division can be mouse, felt pen etc. for defining the peripheral hardware of image range, identification division definition picture
On face, identification division can define a region can also define a central point, and the center at position 201 to be detected indicates one
Cross figure (as shown in Figure 4)；After success defines position 201 to be detected, by controlling the disease of described magnetic resonance imaging system
The movement of bed, control part is intended to detect position 201 and is transported to magnetic field center 202, and wherein, control part to be detected according to described
The position of the magnetic field center 202 of position in described image, the position 201 and described magnetic resonance imaging system, estimation is identified
Distance L1 of position to be detected 201 and described magnetic field center 202, be a region in the region to be detected of identification division definition
In the case of, control part using the geometric center in this region as the position at position 201 to be detected.Described position to be detected is in institute
State geometric center or specified location in user that the position in image is described position to be detected.
Specifically, control part also includes evaluation unit, this evaluation unit can according to the ratio of described image, be intended to examine
Survey the formula that the parameter such as coordinate position of position 201 coordinate position in the picture and magnetic field center 202 is constituted, to being intended to detect
The distance of position 201 and magnetic field center 202 is estimated.For example, as it is known that the coordinate position of magnetic field center and some and magnetic field
The relatively-stationary coordinate position in center, according to the ratio of described image, the most proportionally estimates desire test section
The coordinate position of position, and then draw the distance at position to be detected and magnetic field center.
Second specific embodiment
The localization method of the second specific embodiment according to the present invention includes: gather the image of detected object；Display is described
Image；Identify position to be detected in the displayed image；By controlling the movement of the sick bed of described magnetic resonance imaging system, will
The position to be detected identified is transported to described magnetic field center.Fig. 2 is the location side of the second specific embodiment according to the present invention
The schematic diagram of method, Fig. 3 is the schematic diagram of positioner according to an embodiment of the invention, and Fig. 4 is the first tool according to the present invention
The schematic diagram of the shown image of display part of the positioner of body embodiment and the second specific embodiment.
As shown in Figures 2 and 3, video camera 101 He is included according to the positioner 100 of second specific embodiment of the present invention
Display 102, video camera 101 is used for gathering the image of detected object (patient) and by described image transmitting to display 102,
Display 102 is used for showing described image, and wherein, video camera 101 is installed on above sick bed, and display 102 may be mounted at magnetic altogether
At the guidance panel of imaging system of shaking (as shown in Figure 3), it is also possible to be arranged on the main frame of magnetic resonance imaging system.
Positioner 100 also includes identification division and controls part (not shown), and identification division is at shown figure
Position to be detected is identified in Xiang；Control the part movement for the sick bed by controlling described magnetic resonance imaging system, will be marked
The position to be detected known is transported to described magnetic field center.
In first specific embodiment of the present invention, video camera 101 gathers the image of detected object 200, and by this image
Transmission is to display 102；Display 102 shows the image of the detected object 200 that video camera 101 gathered, and as shown in Figure 4, takes the photograph
The image of the detected object 200 gathered as device 101 shows on the display 102, and this image includes detected object whole body, sick bed
Magnet with magnetic resonance imaging system；On this image, identification division is utilized can to define position 201 to be detected, such as Fig. 4 institute
Show, wherein identification division can be mouse, felt pen etc. for defining the peripheral hardware of image range, in position 201 to be detected
The heart indicates a cross figure；After success defines position 201 to be detected, by controlling the sick bed of described magnetic resonance imaging system
Movement, control part is intended to detect position 201 and is transported to magnetic field center, wherein, controls being intended to of being identified of subtrace and detects
Described magnetic field center is arrived at through a precalculated position and moving a fixed range L2 from described precalculated position in position, concrete and
Speech, control part includes tracing unit, and during detected object moves with sick bed, described tracing unit is constantly followed the trail of and marked
The magnetic field center of the relation in the precalculated position in the position to be detected known and an image, this precalculated position and magnetic resonance imaging system
Position relationship i.e. distance determine and it is known that in other words, after the center at position to be detected overlaps with this precalculated position, be intended to
The distance that detection position is moved to magnetic field center also determines that and there is known.Position in described image, the described position to be detected
Putting is geometric center or the specified location in user at described position to be detected.
After success defines position to be detected, under positioner preserves the position to be detected of current video frame as target
Come, in video next frame, then search the part mated most with described target (position to be detected) as new target and protect
Deposit, and repeat this process.In other words, tracking is intended to detect part is exactly the mistake constantly mating target in video next frame
, there is multiple image processing method in prior art and be capable of this image object tracing process in journey.This precalculated position is permissible
It is immediately below video camera or immediately below other positions, preferably video camera, thus reduces error as far as possible；Meanwhile, can be in display
On the image of device, the sick bed of magnetic resonance imaging system is first-class etc. indicates this precalculated position, in order to target arrives at this precalculated position
Time can effectively follow the trail of.
Localization method and the positioner of the present invention based on above-mentioned two specific embodiment have plurality of advantages, wherein wrap
Include: avoid using generating laser thus improve the magnetic resonance imaging system safety for detected object (patient), and
Simple to operate without operator's (doctor) Non-follow control thus improve efficiency and accuracy.
The above, only presently preferred embodiments of the present invention, it is not intended to limit protection scope of the present invention.At tool
Can be to being improved appropriately according to a preferred embodiment of the invention in the implementation process of body, to adapt to specifically needing of concrete condition
Want.It will therefore be appreciated that the detailed description of the invention of invention as described herein simply plays an exemplary role, not in order to limit this
Bright protection domain.
Claims (8)
1. a localization method for magnetic resonance imaging system, including,
Gather the image of detected object；
Show described image；
Identify position to be detected in the displayed image；
By controlling the movement of the sick bed of described magnetic resonance imaging system, the position to be detected identified is transported to described magnetic altogether
The magnetic field center of imaging system of shaking,
Wherein, the described position to be detected is transported to described magnetic field center, including, according to ratio, the described desire of described image
Detecting the position of the magnetic field center of position in described image, the position and described magnetic resonance imaging system, estimation is identified
Position to be detected and the distance of described magnetic field center.
2. a localization method for magnetic resonance imaging system, including,
Gather the image of detected object；
Show described image；
Identify position to be detected in the displayed image；
By controlling the movement of the sick bed of described magnetic resonance imaging system, the position to be detected identified is transported to described magnetic altogether
The magnetic field center of imaging system of shaking,
Wherein, the described position to be detected is transported to described magnetic field center, including, follow the trail of the position to be detected identified in institute
State the position in image and arrive in described magnetic field through a precalculated position and moving a fixed range from described precalculated position
The heart.
The localization method of magnetic resonance imaging system the most according to claim 1 and 2, wherein, described position to be detected is in institute
State geometric center or specified location in user that the position in image is described position to be detected.
4. a positioner for magnetic resonance imaging system, including an image acquisition part, a display part, an identification division and
One control part, wherein,
Described image acquisition part, for gathering the image of detected object and by described image transmitting to described display part；
Described display part, is used for showing described image；
Described identification division, for identifying position to be detected in the displayed image；
Described control part, for the movement of sick bed by controlling described magnetic resonance imaging system, detects being intended to of being identified
Position is transported to the magnetic field center of described magnetic resonance imaging system,
Wherein, described control part also includes an evaluation unit, and described evaluation unit, for according to the ratio according to described image
The position of the magnetic field center of position in described image of example, the position to be detected identified and described magnetic resonance imaging system
Put, estimate the distance of position to be detected and the described magnetic field center identified.
5. a positioner for magnetic resonance imaging system, including an image acquisition part, a display part, an identification division and
One control part, wherein,
Described image acquisition part, for gathering the image of detected object and by described image transmitting to described display part；
Described display part, is used for showing described image；
Described identification division, for identifying position to be detected in the displayed image；
Described control part, for the movement of sick bed by controlling described magnetic resonance imaging system, detects being intended to of being identified
Position is transported to the magnetic field center of described magnetic resonance imaging system,
Wherein, described control part also includes a tracing unit, and described tracing unit, for following the trail of the position to be detected identified
Described magnetic is arrived at through a precalculated position and moving a fixed range from described precalculated position in position in described image
Center, field.
The positioner of magnetic resonance imaging system the most according to claim 5, wherein, described precalculated position is described image
The underface of collecting part.
7. according to the positioner of described magnetic resonance imaging system arbitrary in claim 4-6, wherein, described position to be detected
Position in described image is geometric center or the specified location in user at described position to be detected.
8. a magnetic resonance imaging system, wherein, including the positioner as described in arbitrary in claim 4-7.
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| CN105476634B (en) * | 2014-09-15 | 2019-02-22 | 西门子(深圳)磁共振有限公司 | Imaging device and positioning device |
| CN105726025A (en) * | 2014-12-09 | 2016-07-06 | Ge医疗系统环球技术有限公司 | Magnetic resonance imaging scanning method |
| CN107144805A (en) * | 2017-06-09 | 2017-09-08 | 创领心律管理医疗器械（上海）有限公司 | A kind of synthesis field method of testing of lower limb model and magnetic resonance imaging safety evaluation |
| CN107861079B (en) * | 2017-11-03 | 2020-04-24 | 上海联影医疗科技有限公司 | Method for local coil localization, magnetic resonance system and computer-readable storage medium |
| CN108968960A (en) * | 2018-06-27 | 2018-12-11 | 上海联影医疗科技有限公司 | Localization method and magnetic resonance system for magnetic resonance system |
| CN113908452B (en) * | 2021-10-15 | 2024-05-24 | 国宏国康(北京)健康科技发展有限公司 | Proton treatment auxiliary positioning illumination system and method |
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| JPH03258244A (en) * | 1990-03-09 | 1991-11-18 | Toshiba Corp | Tomographic equipment |
| US5588430A (en) * | 1995-02-14 | 1996-12-31 | University Of Florida Research Foundation, Inc. | Repeat fixation for frameless stereotactic procedure |
| DE10232681A1 (en) * | 2002-07-18 | 2004-01-29 | Siemens Ag | Method and device for positioning a patient in a medical diagnostic or therapeutic device |
| CN201384493Y (en) * | 2009-03-12 | 2010-01-20 | 西门子迈迪特(深圳)磁共振有限公司 | Positioning device used for magnetic resonance system |
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