CN105310704B - The control system and control method of radiophotography - Google Patents
The control system and control method of radiophotography Download PDFInfo
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- CN105310704B CN105310704B CN201410241082.9A CN201410241082A CN105310704B CN 105310704 B CN105310704 B CN 105310704B CN 201410241082 A CN201410241082 A CN 201410241082A CN 105310704 B CN105310704 B CN 105310704B
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- movement
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- radiophotography
- detection signal
- displacement
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Abstract
The present invention relates to the control system of radiophotography and control methods.A kind of control system of radiophotography, comprising: motion sensor is configured to the movement of detected target object and generates detection signal；Controller, is configured to assess the detection signal, and when assessment result indicates that the movement of the target object enables a radiologicaal imaging system to execute radiophotography to the target object when not influencing image quality.Using the scheme in the present invention, it can be effectively reduced or even prevent the unsuccessful radiophotography as caused by the movement of target object, the movement of carrying platform or the movement of flat panel detector, to reduce the radiological dose and injury risk for each target object from the angle of statistical average.
Description
Technical field
The present invention relates generally to the controls of radiophotography.
Background technique
X-ray wavelength is short (about 0.1~10 nanometer), and energy is big, and when impinging upon on substance, only a part is absorbed by substance,
It is most of to be penetrated via atom gap, show very strong penetration capacity.The penetration power of X-ray is related with material density, puts
The different substance of density (such as bone and muscle) can be distinguished using this property of differential absorption by penetrating imaging technique.From
After being found from X-ray, radiographic viewing techniques are widely used in medical domain.
The X-ray radiation of large dosage can generate injury to human body.Radiologic technologist is completed to go to computer room to the pendulum position of patient
Outside, it adjusts exposure parameter and presses exposure button, the process for completing X-ray exposure needs several minutes of time, the mobile body of patient
Body or cough etc., will lead to receptive area domain not in correct position on.In addition to this, the duration of primary electrical radiophotography
About 1~50 millisecond (changing depending on activity and single fraction metering).During radiophotography, such as move or by cough
The movement of the human bodies such as shake caused by coughing will leave motion artifacts in final image, unqualified so as to cause image quality
(quality of image requirement for being not suitable for medical diagnosis), and then additional radiological dose reimaging is needed, it increases to human body band
Come the risk injured.
Disclosure
It has been investigated that the duration of the discernable action state (such as dither state or stationary state) of human body is usual
Greater than the radiation duration of primary emission imaging, so that detection human action is possibly realized with controlling radiation timing.
One embodiment discloses a kind of control system of radiophotography, comprising: motion sensor is configured to detect
The movement of target object simultaneously generates detection signal；Controller is configured to assess the detection signal, and when assessment result refers to
Show that the movement of the target object does not influence that a radiologicaal imaging system is enabled to execute the target object when image quality
Radiophotography.
Another embodiment discloses a kind of control method of radiophotography, comprising: via motion sensor senses target
The movement of object simultaneously generates detection signal；The detection signal is assessed, and when assessment result indicates the movement of the target object
It does not influence that a radiologicaal imaging system is enabled to execute radiophotography to the target object when image quality.
In one embodiment, the detection signal for assessing motion sensor includes filtering to the detection low pass signal.
In one embodiment, the detection signal for assessing motion sensor further includes carrying out temperature drift to the detection signal
Move compensation.
In one embodiment, the detection signal includes the acceleration letter of the movement of target object in a plurality of directions
Number.
In one embodiment, assessing the detection signal includes identifying described in movement and the determination of the target object
The displacement of movement, when the displacement of the movement is less than predetermined threshold, assessment result indicates the movement of the target object
Do not influence image quality.
In one embodiment, the displacement for determining the movement includes the position for determining the movement on the multiple direction
It moves, when displacement of the movement on the multiple direction is respectively less than corresponding predetermined threshold, assessment result indicates institute
The movement for stating target object does not influence image quality.
In one embodiment, the radiophotography includes X-ray radiophotography.
In one embodiment, the motion sensor includes MEMS acceleration transducer.
In one embodiment, the motion sensor is integrated in wearable device, carrying platform or plate detection
Device.
Using the system and method in the present invention, movement, the carrying by target object are can be effectively reduced or even prevented
Unsuccessful radiophotography caused by the movement of platform or the movement of flat panel detector, to be reduced from the angle of statistical average
For the radiological dose and injury risk of each target object.
Detailed description of the invention
In conjunction with attached drawing, the detailed description below in relation to the preferred embodiment of this announcement be will become apparent to.This announcement is to lift
The mode of example is explained, and is not limited to attached drawing, and similar appended drawing reference indicates similar element in attached drawing.
Fig. 1 shows the illustrative system block diagram of the radiophotography control system of one embodiment；
Fig. 2 shows the detection signal waveform figures of the motion sensor of one embodiment；
Fig. 3 show Fig. 2 signal waveform it is low-pass filtered after curve graph；
Fig. 4 shows the flow chart of the control method 400 of the radiophotography of one embodiment.
The detailed description of attached drawing is intended to the explanation as currently preferred embodiment of the invention, and is not intended to represent the present invention
The only form that can be achieved.It should be understood that identical or equivalent function can be by being intended to be contained in essence of the invention
Different embodiments of the mind within the scope of are completed.
Specific embodiment
Fig. 1 shows the schematic block diagram of the radiophotography control system 100 of one embodiment.Radiophotography control system
System 100 includes a radiophotography subsystem and a control subsystem.Radiophotography subsystem includes emitter 111, horizontal
Plummer 112.Control subsystem includes motion sensor 121 and controller 123.Controller 123 and motion sensor 121 and
It is communicatively coupled between emitter 111.In radiophotography, target object 130 is lieed down on horizontal plummer 112, fortune
Dynamic sensor is attached to target object 130.Emitter 111 is such as, but not limited to X-ray emitter.
Fig. 2 shows the detection signal waveform figures of the motion sensor of one embodiment.Motion-sensing in the embodiment
Device is such as, but not limited to MEMS acceleration transducer comprising acceleration transducer and gyroscope are able to detect in space three
Acceleration on a direction, and the sequence (curve) that acceleration signal changes over time is able to reflect the frequency of the signal acceleration
Rate.Pulse as shown in Figure 2 is the waveform diagram that acceleration signal when object moves back and forth changes over time.Motion-sensing
The output data rate of device 121 is such as, but not limited within the scope of 500Hz~2000Hz, can either guarantee enough sampling precisions and
Sufficiently small sluggishness, and can avoid excessively high operand bring burden.Number between motion sensor 121 and controller 123
It is such as, but not limited to Serial Peripheral Interface (SPI) (Serial Peripheral Interface, SPI), I2C interface according to coffret
Deng.The data transfer rate of Serial Peripheral Interface (SPI) is higher than 2Mbps；The data transfer rate of I2C interface be chosen as 100kbps, 400kbps or
3.4Mbps。
It has been investigated that there are noises in the common motion process of human body, the acceleration frequency of these noises is higher but does not produce
Raw displacement, has no substantial effect on the quality of radiophotography.The movement of the common generation displacement of human body --- for example move, swing,
Shake --- acceleration frequency then concentrate on 10Hz hereinafter, the quality of radiophotography may be influenced.
High-frequency noise does not generate displacement, and generates the acceleration frequency of the movement of displacement in 10Hz or less.Therefore, movement passes
The acceleration signal sequence that sensor detection generates can be about 10Hz (± 5% model of 10Hz ± 10% or 10Hz via cutoff frequency
In enclosing) low-pass filtering treatment to filter out noise.This low-pass filtering operation can be by digital signal processor with number filter
Wave mode is realized.Inspection is surveyed depending on the characteristic of required precision and specific device or equipment, can also be raw to motion sensor senses
At acceleration signal sequence carry out temperature drift compensation.
Fig. 3 shows low-pass filtered treated the curve of x-axis acceleration change curve in Fig. 2.One one direction movement
Starting and ending be in stationary state, and accelerate, the amplitude of the vector of acceleration in moderating process it is positive and negative opposite.Cause
This, it is (negative comprising two zero endpoints and (positive value) wave crest and one in time period t 1 as shown in Figure 3 or t2
Value) waveform of trough can be used as the mark of one direction movement (starting and ending).The tandem of wave crest and trough can
Using as the mark for judging direction of action (along an arrow direction still against arrow direction).
Known to the duration of data and movement that movement is changed over time along the acceleration of a direction (such as x-axis)
In the case where, displacement of the available This move along this direction (such as x-axis).In known action along the position in three directions
In the case where moving absolute value and the mutual angle in three directions, the total displacement of movement is readily available (absolutely by mathematical operation
Value).By obtained total displacement value to judge whether This move will affect radiophotography compared with a predetermined threshold
Quality.Total displacement value be higher than predetermined threshold (assessment result) indicate the movement be likely to result in pendulum position or movement tail shadow from
And the quality of radiophotography is influenced, shift value, which indicates the movement lower than predetermined threshold (assessment result), will not influence radiation
The quality of imaging.Predetermined threshold can be by obtaining the preparatory experiment statistics of used radiologicaal imaging system.
When the detection data of motion sensor includes the acceleration of (usually three mutually orthogonal directions) on three directions
The displacement (absolute value) in three directions can also be judged that This move whether can compared with respective doors limit value respectively by degree series
Influence the quality of radiophotography.It respectively can be different from each other for the displacement predetermined threshold in three directions.It is common radiation at
As in system, the direction of radioactive ray is essentially perpendicular to imaging plane (target surface).Those skilled in the art will be understood that target pair
As along the displacement on radioactive ray direction (perpendicular to radial plane) on image quality influence it is smaller, be displaced predetermined door accordingly
The desirable range of limit value it is larger and can value can be larger；And target object in the direction for being parallel to radial plane (perpendicular to putting
Directions of rays) on displacement be affected to image quality, it is corresponding to be displaced predetermined threshold to can use range smaller and value
It is generally also smaller.When the displacement absolute value on three directions is respectively less than corresponding threshold value, assessment result indicates the movement
It will not influence the quality of radiophotography.And when at least one of the displacement absolute value on three directions is higher than corresponding door
When limit value, assessment result indicates the movement and is likely to result in pendulum position or moves tail shadow to influence the quality of radiophotography.
There are many optional modes for the calculating of displacement.A kind of direct mode be in the duration of movement (such as
T1 or t2 shown in Fig. 3) calculate acceleration double integral.One multiple integral of acceleration the result is that speed, the knot of double integral
Fruit is exactly to be displaced.
In order to reduce computation complexity and operation delay, displacement can be calculated using simplified formula.It can be by one
The displacement of movement is equivalent to the uniformly accelrated rectilinear motion that initial velocity is zero, corresponding to similar action different size acceleration in advance
Uniform acceleration value counted, to obtain the transfer factor between acceleration peak-to-peak value and average acceleration, and will shift because
Son saves.Such as it when calculating displacement to time period t 1 shown in Fig. 3, can be put down according to acceleration peak-to-peak value and transfer factor
Equal acceleration alpha, then displacement can use formulaTo calculate.
When the movement that assessment result indicates target object 130 does not influence image quality, controller 123, which generates one, to be made
Energy signal, the enable signal enable emitter 111 to execute radiation to target object 130 to be imaged via imaging target surface.
It can also include by the timing signal of the control radiation function switch of operator's input in system.This timing signal
The enable signal generated with controller 123 can generate the control signal of emitter 111 via ' with ' logic.
The undesirable movement of carrying platform 112 may also cause to leave motion artifacts in final image.In Fig. 1 institute
Show in a change case of embodiment, motion sensor 121 is integrated in horizontal plummer 112, so as to efficiently reduce very
To unsuccessful radiophotography caused by the movement prevented as plummer 112.
In another embodiment, the detection output signal of the motion sensor in system includes at least two directions
Acceleration information and angular velocity data.Detection signal assessment still include low-pass filtering (and inspection survey required precision and
Temperature drift compensation depending on the characteristic of specific device or equipment), movement determined according to the duration of acceleration and movement
Displacement judges whether movement influences the quality of radiophotography according to displacement compared with respective doors limit value.
In another embodiment, wireless data connection is used between controller and motion sensor and/or emitter, is made
With such as, but not limited to blue tooth interface.
In one embodiment, when emitter, load bearing equipment, imaging device are designed as executing radiophotography to target object
Target object is in sitting posture.In another embodiment, when emitter, imaging device are designed as executing radiophotography to target object
Target object is in stance.
In one embodiment, motion sensor is integrated in the wearable device used for target object.
In another embodiment, X-ray radiation imaging apparatus or subsystem include flat panel detector.Flat panel detector
Undesirable movement may also cause to leave motion artifacts in final image.Motion sensor is integrated in flat panel detector,
So as to efficiently reduce or even prevent the unsuccessful radiophotography as caused by the movement of flat panel detector.
Fig. 4 shows the flow chart of the control method 400 of the radiophotography of one embodiment.The control method 400 includes
Step 410 and step 420.In step 410, via the movement of motion sensor senses target object and detection signal is generated.
At step 420, the detection signal is assessed, and when assessment result indicates that the movement of the target object does not influence image quality
When enable a radiologicaal imaging system to the target object execute radiophotography.Step 420 can be by one and motion sensor
The controller that is communicatively coupled executes.The more details of control method have been embodied in the control in conjunction with described in Fig. 1 to Fig. 3
In the embodiment of system processed, repeat no more.
Although having illustrated and having described different embodiments of the invention, invention is not limited to these embodiments.Only exist
The technical characteristic occurred in certain claims or embodiment be not meant to cannot in other claims or embodiment
Other features are combined to realize beneficial new technical solution.Without departing substantially from essence of the invention as described in claims
In the case where mind and range, many modifications, change, deformation, substitution and it is equivalent be obvious to those skilled in the art
's.
Claims (16)
1. a kind of control system of radiophotography, comprising:
Motion sensor is configured to the movement of detected target object and generates detection signal；
Controller, is configured to assess the detection signal, and when assessment result indicates the movement of the target object not shadow
A radiologicaal imaging system is enabled to execute radiophotography to the target object when ringing image quality,
Wherein assessing the detection signal includes the movement for identifying the target object and the displacement for determining the movement, works as institute
When stating the displacement of movement less than predetermined threshold, the movement that assessment result indicates the target object does not influence image quality.
2. control system as described in claim 1, wherein assessing the detection signal includes filtering to the detection low pass signal
Wave.
3. control system as claimed in claim 2, wherein assessing the detection signal further includes carrying out to the detection signal
Temperature drift compensation.
4. control system as claimed in claim 2, wherein the detection signal includes the movement of target object in multiple directions
On acceleration signal.
5. control system as described in claim 1, wherein determining that the displacement of the movement includes determining the movement multiple
Displacement on direction, when displacement of the movement on the multiple direction is respectively less than corresponding predetermined threshold, assessment knot
The movement that fruit indicates the target object does not influence image quality.
6. control system according to any one of claims 1 to 5, wherein the radiophotography includes X-ray radiophotography.
7. control system according to any one of claims 1 to 5, wherein the motion sensor includes that MEMS acceleration passes
Sensor.
8. control system according to any one of claims 1 to 5, the motion sensor is integrated in wearable device, holds
Carrying platform or flat panel detector.
9. a kind of control method of radiophotography, comprising:
Via motion sensor senses target object movement and generate detection signal；
Assess the detection signal, and when assessment result indicates that the movement of the target object makes one when not influencing image quality
Radiologicaal imaging system can execute radiophotography to the target object,
Wherein assessing the detection signal includes the movement for identifying the target object and the displacement for determining the movement, works as institute
When stating the displacement of movement less than predetermined threshold, the movement that assessment result indicates the target object does not influence image quality.
10. control method as claimed in claim 9, wherein assessing the detection signal includes filtering to the detection low pass signal
Wave.
11. control method as claimed in claim 10, wherein assessing the detection signal to include further includes believing the detection
Number carry out temperature drift compensation.
12. control method as claimed in claim 9, wherein the detection signal includes the movement of target object in multiple directions
On acceleration signal.
13. control method as claimed in claim 9, wherein determining that the displacement of the movement includes determining the movement multiple
Displacement on direction, when displacement of the movement on the multiple direction is respectively less than corresponding predetermined threshold, assessment knot
The movement that fruit indicates the target object does not influence image quality.
14. the control method as described in any one of claim 9-13, wherein the radiophotography include X-ray radiation at
Picture.
15. the control method as described in any one of claim 9-13, wherein the motion sensor includes MEMS acceleration
Sensor.
16. the control method as described in any one of claim 9-13, the motion sensor be integrated in wearable device,
Carrying platform or flat panel detector.
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| CN104644265B (en) * | 2015-03-03 | 2017-10-27 | 中国科学院苏州生物医学工程技术研究所 | Intelligent Laser treatment hand tool with motion and temperature sense |
| CN106859679B (en) * | 2017-01-25 | 2023-11-03 | 泰山医学院 | PET-MR quality evaluation method, server, terminal and system |
| US10445886B2 (en) * | 2017-05-30 | 2019-10-15 | General Electric Company | Motion-gated medical imaging |
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