CN102894988B - Method and device for dual energy X-ray photography - Google Patents
Method and device for dual energy X-ray photography Download PDFInfo
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- CN102894988B CN102894988B CN201110209620.2A CN201110209620A CN102894988B CN 102894988 B CN102894988 B CN 102894988B CN 201110209620 A CN201110209620 A CN 201110209620A CN 102894988 B CN102894988 B CN 102894988B
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Abstract
The invention provides a method and a device for dual energy X-ray photography. The method includes: using a computer X-ray photography plate to image X-rays permeating an object; using a first X-ray filter to filter X-rays permeating the computer X-ray photography plate; and using a digital X-ray detector to image X-rays permeating the first X-ray filter. The method and the device use single X-ray exposure to obtain dual energy X-ray images, and accordingly false contour, such as false contour caused by movement of the object and false contour caused by tube voltage change of X exposure tubes, caused by twice X-ray exposure can be effectively avoided.
Description
Technical field
The present invention relates to dual-energy x-ray photography, and relate to a kind of dual-energy x-ray method for imaging and equipment particularly.
Background technology
Utilize dual-energy x-ray camera work to obtain two radioscopic images with different average x-ray energies (that is, harmonic(-)mean energy and high average energy) at same visual angle, that is, low energy X ray image and sigmatron image.By combining this low energy X ray image and sigmatron image, the image of special characteristic can be derived.Such as, for torso model image, utilize dual-energy x-ray camera work can derive only skeletal graph picture and/or only soft-tissue image.
At present, two kinds of dual-energy x-ray camera chains are commercially had.A kind of dual-energy x-ray camera chain is the dual-energy x-ray camera chain of company of Fuji, it inserts the acquisition that a metallic plate realizes dual-energy x-ray image by use two CR (computer camera) plates and between these two CR plates, wherein, described two CR plates are designed to for different X-ray energy responsive.But owing to needing auxiliary photoscanning to irradiate CR plate when watching the image that CR plate is formed, the dual-energy x-ray image that therefore the dual-energy x-ray camera chain of company of Fuji obtains can not be read immediately, is difficult to carry out real-time digitized image process.
Another kind of dual-energy x-ray camera chain is the dual-energy x-ray camera chain of GE company, it obtains two radioscopic images with different x-ray energy by using individual digit X-ray detector and rapid X-ray energy switch, wherein, the exposure tube voltage of described X-ray energy Switch Controller X-ray tube carries out switching to obtain high X-ray energy and low X-ray energy.Although the dual-energy x-ray camera chain of GE company can read radioscopic image immediately, it requires successively twice X-ray exposure.Due to needs successively double exposure, therefore this dual-energy x-ray camera chain is very responsive to the motion of subject, may occur diplopia between obtained sigmatron image and low energy X ray image.In addition, because the exposure tube voltage of described X-ray energy Switch Controller X-ray tube switches, the x-ray focus between double exposing in X-ray tube is offset, and this also result in the diplopia between obtained sigmatron image and low energy X ray image.
Therefore, exist and can immediately check obtained radioscopic image for a kind of and solve the dual-energy x-ray method for imaging of diplopia problem and the needs of equipment.
Summary of the invention
Consider the problems referred to above and propose the present invention.The present invention aims to provide and a kind ofly can immediately check obtained radioscopic image and solve dual-energy x-ray method for imaging and the equipment of diplopia problem.
According to an aspect of the present invention, provide a kind of dual-energy x-ray method for imaging, comprising: utilize computer X-ray photography plate to carry out imaging to the X-ray through subject; The first X-ray filter is utilized to filter the X-ray through described computer X-ray photography plate; And utilize digital X ray detector to carry out imaging to the X-ray through described first X-ray filter.
Preferably, described dual-energy x-ray method for imaging can also comprise: read the photographs of described computer X-ray photography plate and described photographs be converted to number format, to provide the first radioscopic image; Digital X ray detector provides the second radioscopic image; And described first radioscopic image and the second radioscopic image are processed, to generate result images.
Preferably, described dual-energy x-ray method for imaging can also comprise: judge whether described second radioscopic image meets predetermined image quality; And when described second radioscopic image does not meet described predetermined image quality, regulate the exposure parameter of x-ray source according to the picture quality of described second radioscopic image.
Preferably, described result images can be at least one in the soft-tissue image of subject and bone image.
Preferably, described first radioscopic image is low energy X ray image, and described second radioscopic image is sigmatron image, forms the average energy of average energy lower than the photon of the described sigmatron image of formation of the photon of described low energy X ray image.
According to a further aspect in the invention, provide a kind of dual-energy x-ray photographic equipment, comprising: computer X-ray photography plate, for carrying out imaging to the X-ray be irradiated to through subject on it; First X-ray filter, for filtering the X-ray through described computer X-ray photography plate; And digital X ray detector, for carrying out imaging to the X-ray through described first X-ray filter.
Preferably, described dual-energy x-ray photographic equipment can also comprise: computer X-ray photography plate reader, for reading the photographs of described computer X-ray photography plate and described photographs being converted to number format, thus provides the first radioscopic image; Described digital X ray detector provides the second radioscopic image; And image processing section, for processing described first radioscopic image and the second radioscopic image, to generate result images.
Preferably, described dual-energy x-ray photographic equipment can also comprise: radioscopic image analysis component, whether meet predetermined image quality for analyzing described second radioscopic image, and regulate the exposure parameter of x-ray source according to the picture quality of described second radioscopic image.
Preferably, described result images can be at least one in the soft-tissue image of subject and bone image.
Preferably, described first X-ray filter is metallic plate, described first radioscopic image is low energy X ray image, and described second radioscopic image is sigmatron image, form the average energy of average energy lower than the photon of the described sigmatron image of formation of the photon of described low energy X ray image.
According to another aspect of the invention, provide a kind of dual-energy x-ray method for imaging, comprising: utilize the first X-ray filter to filter the X-ray sent from X-ray source; Utilize, through the X-ray of described first X-ray filter, X-ray is carried out to subject; Digital X ray detector is utilized to carry out imaging to the X-ray through subject, to provide the first radioscopic image; First X-ray filter is switched to the second X-ray filter; The second X-ray filter is utilized to filter the X-ray sent from X-ray source; Utilize, through the X-ray of described second X-ray filter, X-ray is carried out to subject; And utilize digital X ray detector to carry out imaging to the X-ray through subject, to provide the second radioscopic image.
Preferably, described dual-energy x-ray method for imaging can also comprise: process described first radioscopic image and the second radioscopic image, to generate result images.
Preferably, described result images can be at least one in the soft-tissue image of shadow object being shot and bone image.
Preferably, described dual-energy x-ray method for imaging can also comprise: judge whether described first radioscopic image meets predetermined image quality; And when described first radioscopic image meets described predetermined image quality, the first X-ray filter is switched to the second X-ray filter.
Preferably, described dual-energy x-ray method for imaging can also comprise: when described first radioscopic image does not meet described predetermined image quality, regulates the exposure parameter of x-ray source according to the picture quality of described first radioscopic image.
Preferably, described dual-energy x-ray method for imaging can also comprise: judge whether described second radioscopic image meets predetermined image quality; And when described second radioscopic image meets described predetermined image quality, process to generate result images to described first radioscopic image and the second radioscopic image.
Preferably, described dual-energy x-ray method for imaging can also comprise: when described second radioscopic image does not meet described predetermined image quality, regulates the exposure parameter of x-ray source according to the picture quality of described second radioscopic image.
Preferably, described first radioscopic image is low energy X ray image, and described second radioscopic image is sigmatron image, forms the average energy of average energy lower than the photon of the described sigmatron image of formation of the photon of described low energy X ray image.
In accordance with a further aspect of the present invention, provide a kind of dual-energy x-ray photographic equipment, comprising: the first X-ray filter, for filtering the X-ray sent from X-ray source; Second X-ray filter, for filtering the X-ray sent from X-ray source; X-ray filter switch, for switching between described first X-ray filter and described second X-ray filter, only to utilize one of them to filter the X-ray sent from X-ray source; And digital X ray detector, for carrying out imaging to the X-ray through subject, to provide radioscopic image, wherein, when described first X-ray filter filters the X-ray sent from X-ray source, described digital X ray detector provides the first radioscopic image, and when described second X-ray filter filters the X-ray sent from X-ray source, described digital X ray detector provides the second radioscopic image.
Preferably, described dual-energy x-ray photographic equipment can also comprise: image processing section, for processing described first radioscopic image and the second radioscopic image, to generate result images.
Preferably, described result images can be at least one in the soft-tissue image of subject and bone image.
Preferably, described dual-energy x-ray photographic equipment can also comprise: the first radioscopic image analysis component, predetermined image quality whether is met for analyzing described first radioscopic image, wherein, when described first radioscopic image meets described predetermined image quality, the first X-ray filter is switched to the second X-ray filter by described X-ray filter switch.
Preferably, when described first radioscopic image does not meet described predetermined image quality, described first radioscopic image analysis component can also regulate the exposure parameter of x-ray source according to the picture quality of described first radioscopic image.
Preferably, described dual-energy x-ray method for imaging can also comprise: the second radioscopic image analysis component, predetermined image quality whether is met for analyzing described second radioscopic image, wherein, when described second radioscopic image meets described predetermined image quality, described image processing section processes to generate result images to described first radioscopic image and the second radioscopic image.
Preferably, when described second radioscopic image does not meet described predetermined image quality, described second radioscopic image analysis component regulates the exposure parameter of x-ray source according to the picture quality of described second radioscopic image.
Preferably, described first radioscopic image is low energy X ray image, and described second radioscopic image is sigmatron image, forms the average energy of average energy lower than the photon of the described sigmatron image of formation of the photon of described low energy X ray image.
Preferably, described first X-ray filter is the screen plate be made up of aluminum (Al), copper (Cu), other metal or the combination more than two kinds of metals.
Preferably, described second X-ray filter is the screen plate be made up of the combination of copper (Cu), molybdenum (Sm), cerium (Ce), other metal, rare earth material or above-mentioned material.
Accompanying drawing explanation
Embodiments of the present invention is described in detail in conjunction with the drawings, and above and other objects of the present invention, feature, advantage will become apparent, wherein:
Fig. 1 illustrates the schematic block diagram of dual-energy x-ray method for imaging according to a first embodiment of the present invention.
Fig. 2 illustrates the schematic block diagram of the dual-energy x-ray camera chain of application dual-energy x-ray photographic equipment according to a first embodiment of the present invention.
The schematic diagram that the x-ray photon that Fig. 3 illustrates copper (Cu) absorbs.
The schematic diagram that the x-ray photon that Fig. 4 illustrates aluminum (Al) absorbs.
Fig. 5 illustrates the schematic block diagram of dual-energy x-ray method for imaging according to a second embodiment of the present invention.
Fig. 6 illustrates the schematic block diagram of the dual-energy x-ray camera chain of application dual-energy x-ray photographic equipment according to a second embodiment of the present invention.
The schematic diagram that the x-ray photon that Fig. 7 illustrates molybdenum (Sm) absorbs.
Fig. 8 illustrates the medical application of dual-energy x-ray image.
Detailed description of the invention
Below with reference to the accompanying drawings dual-energy x-ray photographic equipment according to the embodiment of the present invention and dual-energy x-ray method for imaging are described.Particularly, composition graphs 1-4 is described dual-energy x-ray method for imaging according to a first embodiment of the present invention and equipment, composition graphs 5-7 is described dual-energy x-ray method for imaging according to a second embodiment of the present invention and equipment.
First embodiment
In FIG, dual-energy x-ray method for imaging 100 is according to a first embodiment of the present invention shown.
Dual-energy x-ray method for imaging 100 according to a first embodiment of the present invention starts in step S105 place.
In step S110, initialize dual-energy x-ray camera chain, at least comprise the exposure parameter that x-ray source is set.The exposure parameter of x-ray source can comprise at least one item in the exposure tube voltage of x-ray source, exposure tube electric current and time of exposure.
Next, in step S120, launch X-ray with set exposure parameter from x-ray source, and the x-ray bombardment subject utilizing x-ray source to launch.
In step S130, computer X-ray photography plate (CR plate) is utilized to carry out imaging to the X-ray through subject, to form CR plate photographs.In step S140, read the photographs of described computer X-ray photography plate and described photographs be converted to number format, to provide the first radioscopic image.
Next, in step S150, utilize the first X-ray filter to filter the X-ray through described computer X-ray photography plate.In a large amount of absorption of x-rays of described first X-ray filter, there is more low-energy photon, as shown in (C) in Fig. 3, and the overwhelming majority with the photon of higher-energy in X-ray is irradiated on digital X ray detector.
In step S160, digital X ray detector is utilized to carry out imaging, to provide the second radioscopic image to the X-ray through described first X-ray filter.
Then, in step S170, judge whether described second radioscopic image meets predetermined image quality requirements, described predetermined image quality requirements includes but not limited to brightness of image, with image definition etc., and can be customized as required by those skilled in the art.When described second radioscopic image meets predetermined image quality requirements, the method proceeds to step S180.In step S180, described first radioscopic image and the second radioscopic image are processed, generate result images.Exemplarily, described result images is at least one in the soft-tissue image of subject and bone image.Existing image processing method and equipment can be utilized to realize this image processing function, dual-energy x-ray method for imaging according to a first embodiment of the present invention is not subject to adopted concrete image processing method and the restriction of equipment, can apply other image processing method and the equipment of exploitation in the future in the scope of dual-energy x-ray method for imaging of the present invention.
When described second radioscopic image does not meet predetermined image quality requirements, such as the brightness of image of described second radioscopic image is inadequate, or the image definition of described second radioscopic image is too low, the method returns step S110, and arranges the exposure parameter of x-ray source according to the analysis result of the picture quality to described second radioscopic image.
Therefore, first radioscopic image is formed by the X-ray (both comprised the photon with higher-energy also comprise have more low-energy photon) through subject, and the second radioscopic image is formed by the X-ray (mainly comprising the photon with higher-energy) through the first X-ray filter.In other words, the first radioscopic image has relatively low X-ray average energy compared with the second radioscopic image, and the second radioscopic image and the first radioscopic image have relatively high X-ray average energy.
In addition, when described second radioscopic image does not meet predetermined image quality requirements, can not step S140 be performed, that is, not read the photographs on CR plate, described photographs is not converted to number format to provide the first radioscopic image.In other words, in the case, can step S140 and S180 be merged in step S180, when described second radioscopic image meets predetermined image quality requirements, first read the photographs of CR plate and described photographs be converted to number format to provide the first radioscopic image, recycle the first radioscopic image and the second radioscopic image to generate result images, such as, at least one in the soft-tissue image of subject and bone image.
Particularly, can not read the photographs on CR plate when described second radioscopic image does not meet predetermined quality condition and the photographs directly wiped on CR plate, and after reading its photographs from CR plate, wipe the photographs on CR plate when described second radioscopic image meets predetermined image quality requirements again.
Preferably, in the step s 120, first send X-ray from X-ray source, then utilize the second X-ray filter to filter the X-ray sent from X-ray source, the X-ray finally recycled through described second X-ray filter carries out X-ray to subject.Described second X-ray filter can not pass the part X-ray of subject (such as, human body) for absorbing, thus, reduce the radiation of useless X-ray energy to subject.
Finally, dual-energy x-ray method for imaging according to a first embodiment of the present invention terminates in step S199.
Next, reference Fig. 2 illustrates dual-energy x-ray camera chain 200 according to a first embodiment of the present invention.
In fig. 2, illustrate dual-energy x-ray camera chain 200 according to a first embodiment of the present invention, it comprises x-ray source 210, dual-energy x-ray photographic equipment 220 and control appliance 230.
Dual-energy x-ray photographic equipment 220 comprises computer X-ray photography plate (CR plate) 2210, first X-ray filter 2220 and digital X ray detector 2230.
The x-ray bombardment sent from x-ray source 210, on subject (such as, human body), shines directly on computer X-ray photography plate 2210 after through subject.Computer X-ray photography plate 2210 is utilized to carry out imaging to the X-ray be irradiated to through subject on it, to form CR plate photographs.
Image information on the known CR of being recorded in plate needs read through laser scanning and just can be converted to number format through opto-electronic conversion.Therefore, the photographs on CR plate can not directly be read.Need to utilize computer X-ray photography plate reader read the photographs of described computer X-ray photography plate and described photographs is converted to number format, thus the first radioscopic image is provided.But, for dual-energy x-ray photographic equipment according to a first embodiment of the present invention, not necessarily, this computer X-ray photography plate reader can exist as/equipment of being separated independent with dual-energy x-ray photographic equipment this computer X-ray photography plate reader.
Computer X-ray photography plate reader carries out laser scanning to CR plate, reads the photographs on CR plate, and this photographs is converted to number format.The mode reading CR plate due to computer X-ray photography plate reader is known, does not repeat at this to it.But the present invention does not read the restriction of the mode of CR plate by concrete computer X-ray photography plate reader, the computer X-ray photography plate reading manner of exploitation in the future can be utilized when not departing from the present invention's design.
After CR plate 2210, the first X-ray filter 2220 filters the X-ray through described computer X-ray photography plate 2210.Then, digital X ray detector 1230 carries out imaging to the X-ray through described first X-ray filter, thus provides the second radioscopic image.
The energy of brief description first radioscopic image and the second radioscopic image is carried out below in conjunction with Fig. 3.
Although have been noted that: there is individual variation between subject, the muscle of subject, organ and the absorption of bone to X-ray are different, and the frequency spectrum through the X-ray after subject also can be different with the frequency spectrum of the X-ray being irradiated to subject.But, in the following description, in order to simplified characterization, still utilize the X-ray being irradiated to subject to describe as launching through the X-ray after subject.
The schematic diagram that the x-ray photon illustrating copper (Cu) plate of 1mm thickness in figure 3 absorbs.As shown in Figure 3, (A) show from x-ray source send (at this, be assumed to be and be irradiated on subject) spectrum of original X-ray, (B) show be irradiated to the spectrum of the X-ray on digital X ray detector 2230 after the first X-ray filter 2220 absorbs, and (C) shows the spectrum of the X-ray absorbed by the first X-ray filter 2220.In figure 3, transverse axis represents the energy of x-ray photon, and the longitudinal axis represents the quantity of the photon being positioned at a certain energy place.
As shown in (A) in Fig. 3, it illustrates the original X-ray be irradiated on subject, the spectrum of this original X-ray had both comprised the photon with higher-energy and has also comprised and have more low-energy photon.Therefore, the X-ray through subject shines directly on CR plate 2210, and the X-ray shone directly on this CR plate had both comprised the photon with higher-energy and also comprised and have more low-energy photon.
As mentioned above, described first X-ray filter 2220 is between CR plate 2210 and digital X ray detector 2230, in its a large amount of absorption of x-rays, there is more low-energy photon, as shown in (C) in Fig. 3, and the overwhelming majority with the photon of higher-energy in X-ray is irradiated on digital X ray detector 2230.
Therefore, the first radioscopic image being derived from CR plate 2210 is formed by the X-ray (both comprised the photon with higher-energy also comprise have more low-energy photon) through subject, and the second radioscopic image being derived from digital X ray detector 2230 is formed by the X-ray (mainly comprising the photon with higher-energy) through the first X-ray filter 2220.In other words, the first radioscopic image being derived from CR plate 2210 has relatively low photon average energy compared with the second radioscopic image being derived from digital X ray detector 2230, and the second radioscopic image being derived from digital X ray detector 2230 has relatively high photon average energy with the first radioscopic image being derived from CR plate 2210.That is, the first radioscopic image is low energy X ray image, and the second radioscopic image is sigmatron image.
Described first X-ray filter 2220 can be made up of the combination of copper (Cu), molybdenum (Mo), other metal material or metal material.In addition, described first X-ray filter 2220 is not limited to an X-ray filter, and can be made up of more than one X-ray filter, such as, be laminated by multiple X-ray filter be made up of identical or different metal material.
In addition, dual-energy x-ray photographic equipment 220 according to a first embodiment of the present invention can also comprise: image processing section (not shown), and it is for processing described first radioscopic image and the second radioscopic image, to generate result images.This image processing section can exist as the parts of dual-energy x-ray photographic equipment according to a first embodiment of the present invention, or can exist as/equipment of being separated independent with dual-energy x-ray photographic equipment, such as, be present in the control appliance 230 shown in figure.
Such as, image processing section processes described first radioscopic image and the second radioscopic image, to generate at least one in the soft-tissue image of subject (such as, human body) and bone image.As shown in Figure 8, soft-tissue image and the bone image in the thoracic cavity of the subject utilizing described first radioscopic image and the second radioscopic image to generate is shown.
Dual-energy x-ray photographic equipment 220 according to a first embodiment of the present invention immediately can check the second obtained radioscopic image by utilizing digital X ray detector 2230, the generation of radioscopic image can be controlled thus in real time, to obtain the radioscopic image of good quality, avoid the waste of x-ray dose and under avoiding subject to be exposed to X-ray too much simultaneously.
For this reason, dual-energy x-ray photographic equipment 220 according to a first embodiment of the present invention can also comprise radioscopic image analysis component (not shown), whether it meets predetermined image quality requirements for analyzing described second radioscopic image, and described predetermined image quality requirements includes but not limited to brightness of image, with image definition etc.
When described second radioscopic image meets predetermined image quality requirements, described image processing section 2240 processes described first radioscopic image and the second radioscopic image, to generate result images.But, when described second radioscopic image does not meet predetermined image quality requirements, such as the brightness of image of described second radioscopic image is inadequate, or the image definition of described second radioscopic image is too low, this radioscopic image analysis component regulates the exposure parameter of x-ray source according to the picture quality of described second radioscopic image, such as, exposure tube voltage, exposure tube electric current or time of exposure etc.
With image processing section analogously, this radioscopic image analysis component can exist as the parts of dual-energy x-ray photographic equipment according to a first embodiment of the present invention, or can exist as/equipment of being separated independent with dual-energy x-ray photographic equipment, such as, be present in the control appliance 230 shown in figure.
By way of parenthesis, dual-energy x-ray photographic equipment 220 according to a first embodiment of the present invention can also comprise CR blackboard eraser except parts (not shown), and it is for wiping the image on CR plate.Such as, when described second radioscopic image does not meet predetermined quality condition, computer X-ray photography plate reader does not read the photographs on CR plate, and directly removes the photographs on parts erasing CR plate by CR blackboard eraser; When described second radioscopic image meets predetermined image quality requirements, at computer X-ray photography plate reader from after CR plate reads its photographs, then to be wiped the photographs on CR plate except parts by CR blackboard eraser.Similarly, this CR blackboard eraser also can exist as/equipment of being separated independent with dual-energy x-ray photographic equipment except parts.
In addition, dual-energy x-ray photographic equipment 220 according to a first embodiment of the present invention also comprises: the second X-ray filter 2240, it can not through subject (such as absorbing, human body) part X-ray, thus reduce the radiation of useless X-ray energy to subject.Second X-ray filter 2240 can be made up of the combination of the combination of Al, Cu, Al/Cu or other metal material.
The situation that the x-ray photon exemplarily giving aluminum (Al) plate of 1mm thickness in the diagram absorbs.As shown in Figure 4, (A) spectrum of the original X-ray sent from x-ray source is shown, (B) show be irradiated to the spectrum of the X-ray on subject after the second X-ray filter 2240 absorbs, and (C) shows the spectrum of the X-ray absorbed by the second X-ray filter 2240.In the diagram, transverse axis represents the energy of x-ray photon, and the longitudinal axis represents the quantity of the photon being positioned at a certain energy place.
As shown in (A) in Fig. 4, it illustrates the original X-ray sent from x-ray source, the spectrum of this original X-ray had both comprised the photon with higher-energy and has also comprised and have more low-energy photon.
Second X-ray filter 2240 absorbs in a large number, and (such as, absorbing completely) can not through the part X-ray of subject.Such as, as shown in (C) in Fig. 4, the photon that the energy of photon is less than the part X-ray of 15keV is completely absorbed, and absorption photon energy being greater than to the photon of the part X-ray of 15keV is less.
In the diagram, the example that the x-ray photon giving the second X-ray filter 2240 realized by the Al plate of 1mm absorbs, but the present invention is not limited thereto, those skilled in the art can utilize the Al plate of different-thickness or utilize the metallic plate of different metal material to realize the second X-ray filter 2240, through the part X-ray of subject, the radiation of useless X-ray energy to subject can not be reduced as long as it can absorb in a large number (being not limited to absorb completely).
In addition, as can be seen from Figure 3, total x-ray photon quantity is constant, that is, the x-ray photon quantity absorbed by the first X-ray filter 2220 equals to be irradiated to the x-ray photon quantity of the first X-ray filter 2220 with the x-ray photon quantity sum through the first X-ray filter 2220.
In like manner, as can be seen from Figure 4, total x-ray photon quantity is also constant, that is, the x-ray photon quantity absorbed by the second X-ray filter 2240 equals to be irradiated to the x-ray photon quantity of the second X-ray filter 2240 with the x-ray photon quantity sum through the second X-ray filter 2240.
Dual-energy x-ray method for imaging according to a first embodiment of the present invention and equipment immediately can check the second obtained radioscopic image by utilizing digital X ray detector, can control the generation of radioscopic image thus in real time.In addition, utilize single X-ray to expose and can obtain dual-energy x-ray image: sigmatron image and low energy X ray image, therefore the diplopia problem caused by twice X-ray exposure can effectively be avoided, such as, the diplopia caused due to the motion of subject or the diplopia caused due to the tube voltage change of X exposure tube.
Second embodiment
Next, dual-energy x-ray method for imaging according to a second embodiment of the present invention and equipment composition graphs 5-7 are described.
In Figure 5, dual-energy x-ray method for imaging 500 is according to a second embodiment of the present invention shown.
Dual-energy x-ray method for imaging 500 according to a second embodiment of the present invention starts in step S505 place.
In step S510, initialize dual-energy x-ray camera chain, at least comprise the exposure parameter that x-ray source is set.The exposure parameter of x-ray source can comprise at least one item in the exposure tube voltage of x-ray source, exposure tube electric current and time of exposure.
Next, in step S520, launch X-ray with set exposure parameter from x-ray source.In step S525, the first X-ray filter is utilized to filter the X-ray of launching from x-ray source.In step S530, utilize the x-ray bombardment subject through the first X-ray filter.In step S535, digital X ray detector is utilized to carry out imaging to the X-ray through subject, to form the first radioscopic image.
Then, in step S540, judge whether described first radioscopic image meets predetermined image quality requirements, described predetermined image quality requirements includes but not limited to brightness of image, with image definition etc., and can be customized as required by those skilled in the art.When the judged result of step S540 is "Yes", the method proceeds to step S550.
Next, in step S550, rapidly the first X-ray filter is switched to the second X-ray filter.
Then, in step S560, still launch X-ray with set exposure parameter from x-ray source.In step S565, the second X-ray filter is utilized to filter the X-ray of launching from x-ray source.In step S570, utilize the x-ray bombardment subject through the second X-ray filter.In step S575, digital X ray detector is utilized to carry out imaging to the X-ray through subject, to form the second radioscopic image.
Exemplarily, the average photon energy forming the X-ray of described first radioscopic image is less than the average photon energy of the X-ray of described second radioscopic image, therefore, the first radioscopic image is low energy X ray image, and the second radioscopic image is sigmatron image.
Such as, the X-ray with the X-ray spectrum of (B) in Fig. 4 can as the X-ray of formation first radioscopic image, and the X-ray with the X-ray spectrum of (B) in Fig. 3 can as the X-ray of formation second radioscopic image.As can be seen from (B) in Fig. 3 and (B) in Fig. 4, form the average photon energy (Fig. 3 (B)) of average photon energy (Fig. 4 (B)) lower than the X-ray of formation second radioscopic image of the X-ray of the first radioscopic image, namely, first radioscopic image is low energy X ray image, and the second radioscopic image is sigmatron image.
As another example, the X-ray with the X-ray spectrum of (B) in Fig. 4 can as the X-ray of formation first radioscopic image, and the X-ray with the X-ray spectrum of (B) in Fig. 7 can as the X-ray of formation second radioscopic image.As can be seen from (B) in Fig. 7 and (B) in Fig. 4, form the average photon energy (Fig. 7 (B)) of average photon energy (Fig. 4 (B)) lower than the X-ray of formation second radioscopic image of the X-ray of the first radioscopic image, namely, first radioscopic image is low energy X ray image, and the second radioscopic image is sigmatron image.
As another example, the X-ray with the X-ray spectrum of (B) in Fig. 3 can as the X-ray of formation first radioscopic image, and the X-ray with the X-ray spectrum of (B) in Fig. 7 can as the X-ray of formation second radioscopic image.As can be seen from (B) in Fig. 3 and (B) in Fig. 7, form the average photon energy (Fig. 7 (B)) of average photon energy (Fig. 3 (B)) lower than the X-ray of formation second radioscopic image of the X-ray of the first radioscopic image, namely, first radioscopic image is low energy X ray image, and the second radioscopic image is sigmatron image.
Then, in step S580, described first radioscopic image and the second radioscopic image are processed, generate result images.Exemplarily, described result images is at least one in the soft-tissue image of subject and bone image.Existing image processing method and equipment can be utilized to realize this image processing function, dual-energy x-ray method for imaging according to a second embodiment of the present invention is not subject to adopted concrete image processing method and the restriction of equipment, can apply other image processing method and the equipment of exploitation in the future in the scope of dual-energy x-ray method for imaging of the present invention.
When the judged result of step S540 is "No", such as the brightness of image of described first radioscopic image is inadequate, or the image definition of described first radioscopic image is too low, the method returns step S510, and arranges the exposure parameter of x-ray source according to the analysis result of the picture quality to described first radioscopic image.
In addition, although not shown in Figure 5, after step S575, a step similar to step S540 can also be comprised, for judging whether described second radioscopic image meets predetermined image quality requirements.Described predetermined image quality requirements can be different from the predetermined image quality requirements for the first radioscopic image, can include but not limited to brightness of image, with image definition etc., and can be customized as required by those skilled in the art.When the judged result of this step is "Yes", the method proceeds to step S580, carries out image procossing.And when the judged result of this step is "No", such as the brightness of image of described second radioscopic image is inadequate, or the image definition of described second radioscopic image is too low, the method returns step S510, and arranges the exposure parameter of x-ray source according to the analysis result of the picture quality to described second radioscopic image.
It will be understood by those skilled in the art that in dual-energy x-ray method for imaging according to a second embodiment of the present invention, can comprise one of step S540 and the above-mentioned steps similar to step S540 or both.
Finally, dual-energy x-ray method for imaging according to a second embodiment of the present invention terminates in step S599.
Although above according to first utilizing the first X-ray metre filter X-ray and generating the first radioscopic image as low energy X ray image, then utilize the second X-ray metre filter X-ray and generate and describe X-ray method according to a second embodiment of the present invention as the order of the second radioscopic image of sigmatron image, but the present invention is not limited thereto, otherwise first can utilize the second X-ray metre filter X-ray and generate the second radioscopic image as sigmatron image, then utilize the first X-ray metre filter X-ray and generate the first radioscopic image as low energy X ray image.
Next, with reference to figure 6, dual-energy x-ray camera chain 600 is according to a second embodiment of the present invention described.
In figure 6, illustrate dual-energy x-ray camera chain 600 according to a second embodiment of the present invention, it comprises x-ray source 610, dual-energy x-ray photographic equipment 620 and control appliance 630.
Dual-energy x-ray photographic equipment 620 comprises the first X-ray filter 6210, second X-ray filter 6220, X-ray filter switch (not shown) and digital X ray detector 6230.
The x-ray bombardment sent from x-ray source 610 is to the first X-ray filter 6210, and the first X-ray filter 6210 filters the X-ray sent from x-ray source 610, a part of photon in absorption of x-rays.Such as, the first X-ray filter 6210 can be the screen plate be made up of aluminum (Al), copper (Cu), other metal or the combination more than two kinds of metals.First X-ray filter 6210 is not limited to be a slice screen plate, and can be stacked more than a slice screen plate as required.
Alternatively, the x-ray bombardment sent from x-ray source 610 is to the second X-ray filter 6220, and the second X-ray filter 6220 filters the X-ray sent from x-ray source 610, a part of photon in absorption of x-rays.Such as, the second X-ray filter 6220 can be the screen plate be made up of the combination of copper (Cu), molybdenum (Sm), cerium (Ce), other metal, rare earth material or above-mentioned material.Second X-ray filter 6220 is not limited to be a slice screen plate, and can be stacked more than a slice screen plate as required.
The schematic diagram that the x-ray photon illustrating molybdenum (Sm) plate of 1mm thickness in the figure 7 absorbs.As shown in Figure 7, (A) spectrum of the original X-ray sent from x-ray source is shown, (B) show be irradiated to the spectrum of the X-ray on digital X ray detector 6230 after the second X-ray filter 6220 absorbs, and (C) shows the spectrum of the X-ray absorbed by the second X-ray filter 6220.In the figure 7, transverse axis represents the energy of x-ray photon, and the longitudinal axis represents the quantity of the photon being positioned at a certain energy place.
X-ray filter switch realizes the quick switching between the first X-ray filter and the second X-ray filter, only one of the first X-ray filter and the second X-ray filter to be put in the transmission path of X-ray at synchronization.
Exemplarily, X-ray filter switch can be runner, first X-ray filter and the second X-ray filter alternately arrange along the tangential direction of runner on this runner, the first X-ray filter and the second X-ray filter are alternately put in the transmission path of X-ray thus when runner rotates.
The present invention is not limited thereto, those skilled in the art easily expect other implementation of X-ray filter switch, as long as it realizes the switching of the first X-ray filter and the second X-ray filter rapidly, the first X-ray filter and the second X-ray filter are alternately put in the transmission path of X-ray.
Digital X ray detector 6230 carries out imaging to the X-ray through subject.Particularly, when the first X-ray filter 6210 pairs of X-ray are filtered, digital X ray detector 6230 provides the first radioscopic image; And when the second X-ray filter 6220 pairs of X-ray are filtered, digital X ray detector 6230 provides the second radioscopic image.
When forming described first radioscopic image after utilizing the first X-ray filter 6210 pairs of X-ray to filter and form described second radioscopic image after utilizing the second X-ray filter 6220 pairs of X-ray to filter, the average photon energy forming the X-ray of described first radioscopic image is less than the average photon energy of the X-ray of described second radioscopic image, therefore, first radioscopic image is low energy X ray image, and the second radioscopic image is sigmatron image.
In addition, dual-energy x-ray photographic equipment 600 according to a second embodiment of the present invention can also comprise: image processing section (not shown), and it is for processing described first radioscopic image and the second radioscopic image, to generate result images.This image processing section can exist as the parts of dual-energy x-ray photographic equipment according to a second embodiment of the present invention, or can exist as/equipment of being separated independent with dual-energy x-ray photographic equipment, such as, be present in the control appliance 630 shown in figure.
Such as, image processing section processes described first radioscopic image and the second radioscopic image, to generate at least one in the soft-tissue image of subject (such as, human body) and bone image.As shown in Figure 8, soft-tissue image and the bone image in the thoracic cavity of the subject utilizing described first radioscopic image and the second radioscopic image to generate is shown.
Preferably, dual-energy x-ray photographic equipment 620 according to a second embodiment of the present invention can also comprise the first radioscopic image analysis component (not shown), whether it meets predetermined image quality requirements for analyzing described first radioscopic image, and described predetermined image quality requirements includes but not limited to brightness of image, with image definition etc.
When described first radioscopic image meets predetermined image quality requirements, the first X-ray filter is switched to the second X-ray filter by described X-ray filter switch fast.Then, described x-ray source second time sends X-ray, and the second X-ray filter filters X-ray, to generate the second radioscopic image.
Preferably, dual-energy x-ray photographic equipment 620 according to a second embodiment of the present invention can also comprise the second radioscopic image analysis component, whether it meets predetermined image quality requirements for analyzing described second radioscopic image, described predetermined image quality requirements includes but not limited to brightness of image, with image definition etc., and can be different from the predetermined image quality requirements for the first radioscopic image.Described predetermined image quality requirements includes but not limited to brightness of image, with image definition etc., and can be customized as required by those skilled in the art.
The dual-energy x-ray photographic equipment that it should be noted that according to a second embodiment of the present invention can comprise one of the first radioscopic image analysis component and the second radioscopic image analysis component or both.
When the first radioscopic image and/or the second radioscopic image meet corresponding predetermined image quality requirements, described image processing section 2240 processes described first radioscopic image and the second radioscopic image, to generate result images.Exemplarily, described result images is at least one in the soft-tissue image of subject and bone image.Existing image processing method and equipment can be utilized to realize this image processing function, dual-energy x-ray method for imaging according to a second embodiment of the present invention is not subject to adopted concrete image processing method and the restriction of equipment, can apply other image processing method and the equipment of exploitation in the future in the scope of dual-energy x-ray method for imaging of the present invention.
With image processing section analogously, first and second radioscopic image analysis component can exist as the parts of dual-energy x-ray photographic equipment according to a second embodiment of the present invention, or can exist as/equipment of being separated independent with dual-energy x-ray photographic equipment, such as, be present in the control appliance 630 shown in Fig. 6.
Dual-energy x-ray method for imaging according to a second embodiment of the present invention and equipment are under the constant prerequisite of the exposure tube voltage and tube current that keep X-ray tube, realize the quick switching between two different X-ray filters by X-ray filter switch, thus utilize two different X-ray filters to obtain the dual-energy x-ray image with different X-ray average energies.
In addition, dual-energy x-ray method for imaging according to a second embodiment of the present invention and equipment by keep when twice X-ray exposure the exposure tube voltage of X-ray tube and tube current constant, effectively can avoid the change due to exposure tube voltage and tube current and x-ray focus skew in the X-ray tube that causes, effectively can avoid the diplopia between the sigmatron image that causes due to the skew of this x-ray focus and low energy X ray image thus.
On the other hand, the quick switching realizing between two different X-ray filters by utilizing X-ray filter switch, also can reduce the interval between twice X-ray exposure effectively.Noting, between two different x-ray filters, carrying out the interval between twice X-ray exposure that the interval switched between twice caused X-ray exposure is less than by changing caused by the exposure tube voltage of X-ray tube and tube current in a large number by rapid X-ray filter switch.Therefore, dual-energy x-ray method for imaging according to a second embodiment of the present invention and equipment also can avoid the diplopia that causes due to the motion of subject effectively.
Although described dual-energy x-ray method for imaging and the equipment of according to a first embodiment of the present invention with the second embodiment by example with reference to accompanying drawing above, it should be understood that, described embodiment is only illustrative, and not restrictive.It will be appreciated by those skilled in the art that when not departing from the scope and spirit of the present invention limited in claim and equivalent thereof, the change in various forms and details can be made these exemplary embodiments.Such as, the the first X-ray filter illustrated in first embodiment of the invention and the second embodiment and the composition of the second X-ray filter are only examples, when not departing from the scope and spirit of the present invention limited in claim and equivalent thereof, the material, thickness etc. of the first X-ray filter and the second X-ray filter easily can be expected.
Claims (12)
1. a dual-energy x-ray method for imaging, comprising:
Computer X-ray photography plate is utilized to carry out imaging to the X-ray through subject;
The first X-ray filter is utilized to filter the X-ray through described computer X-ray photography plate; And
Digital X ray detector is utilized to carry out imaging to provide the second radioscopic image to the X-ray through described first X-ray filter,
Wherein, when described second radioscopic image does not meet predetermined image quality, do not read described computer X-ray photography plate photographs and directly wipe described computer X-ray photography plate photographs;
When described second radioscopic image meets predetermined image quality, read the photographs of described computer X-ray photography plate and described photographs be converted to number format, to provide the first radioscopic image.
2. dual-energy x-ray method for imaging as claimed in claim 1, comprises further:
Described first radioscopic image and the second radioscopic image are processed, to generate result images.
3. dual-energy x-ray method for imaging as claimed in claim 1, comprises further:
When described second radioscopic image does not meet predetermined image quality, regulate the exposure parameter of x-ray source according to the picture quality of described second radioscopic image.
4. dual-energy x-ray method for imaging as claimed in claim 2, wherein, described result images is at least one in the soft-tissue image of subject and bone image.
5. dual-energy x-ray method for imaging as claimed in claim 1, wherein:
Described first radioscopic image is low energy X ray image, and described second radioscopic image is sigmatron image, forms the average energy of average energy lower than the photon of the described sigmatron image of formation of the photon of described low energy X ray image.
6. dual-energy x-ray method for imaging as claimed in claim 1, photographing utilizing computer X-ray before plate carries out imaging to the X-ray through subject, also comprising:
The second X-ray filter is utilized to filter the X-ray sent from X-ray source; And
Utilize, through the X-ray of described second X-ray filter, X-ray carried out to subject,
Wherein, described second X-ray filter to its energy shortage in X-ray to be greater than the absorbability to all the other photons in X-ray through the absorbability of photon of subject.
7. a dual-energy x-ray photographic equipment, comprising:
Computer X-ray photography plate, for carrying out imaging to the X-ray be irradiated to through subject on it;
Computer X-ray photography plate reader, for reading the photographs of described computer X-ray photography plate;
First X-ray filter, for filtering the X-ray through described computer X-ray photography plate;
Digital X ray detector, for carrying out imaging to provide the second radioscopic image to the X-ray through described first X-ray filter, and
Whether radioscopic image analysis component, meet predetermined image quality for analyzing described second radioscopic image,
Wherein, when described second radioscopic image of described radioscopic image analysis component analysis does not meet predetermined quality condition, described computer X-ray photography plate reader does not read the photographs on described computer X-ray photography plate; When described second radioscopic image of described radioscopic image analysis component analysis meets predetermined image quality, described computer X-ray photography plate reader reads the photographs of described computer X-ray photography plate and described photographs is converted to number format, to provide the first radioscopic image.
8. dual-energy x-ray photographic equipment as claimed in claim 7, also comprises:
Image processing section, for processing described first radioscopic image and the second radioscopic image, to generate result images.
9. dual-energy x-ray photographic equipment as claimed in claim 8, wherein,
Described radioscopic image analysis component also regulates the exposure parameter of x-ray source according to the picture quality of described second radioscopic image.
10. dual-energy x-ray photographic equipment as claimed in claim 8, wherein, described result images is at least one in the soft-tissue image of subject and bone image.
11. dual-energy x-ray photographic equipments as claimed in claim 8, wherein:
Described first X-ray filter is metallic plate, and
Described first radioscopic image is low energy X ray image, and described second radioscopic image is sigmatron image, forms the average energy of average energy lower than the photon of the described sigmatron image of formation of the photon of described low energy X ray image.
12. dual-energy x-ray photographic equipments as claimed in claim 7, also comprise:
Second X-ray filter, for filtering the X-ray sent from X-ray source,
Wherein, described second X-ray filter to its energy shortage to be greater than the absorbability to all the other photons in X-ray through the absorbability of photon of subject,
Utilize, through the X-ray of described second X-ray filter, X-ray is carried out to subject.
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| CN103431871B (en) * | 2013-09-04 | 2016-03-30 | 马文 | Portable X-ray periphery bone mineral density detection method and imaging system |
| CN106955117B (en) * | 2017-03-27 | 2021-05-07 | 北京东软医疗设备有限公司 | Vessel imaging system apparatus and method |
| CN107179650A (en) * | 2017-05-12 | 2017-09-19 | 太仓诚泽网络科技有限公司 | A kind of method for imaging based on ray |
| CN109115808B (en) * | 2018-08-28 | 2021-04-30 | 中国工程物理研究院激光聚变研究中心 | Dual-energy imaging method and system |
| WO2020216307A1 (en) | 2019-04-23 | 2020-10-29 | 上海联影医疗科技有限公司 | Method, system and device for acquiring radiological image, and storage medium |
| CN110415312B (en) * | 2019-07-30 | 2022-04-12 | 上海联影医疗科技股份有限公司 | Method, system, device and storage medium for acquiring radiation image |
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