CN103377466A - Method and system for improving image contrast in perspective imaging system - Google Patents
Method and system for improving image contrast in perspective imaging system Download PDFInfo
- Publication number
- CN103377466A CN103377466A CN2013101223712A CN201310122371A CN103377466A CN 103377466 A CN103377466 A CN 103377466A CN 2013101223712 A CN2013101223712 A CN 2013101223712A CN 201310122371 A CN201310122371 A CN 201310122371A CN 103377466 A CN103377466 A CN 103377466A
- Authority
- CN
- China
- Prior art keywords
- image
- images
- ray beam
- modulation
- energy
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Apparatus For Radiation Diagnosis (AREA)
Abstract
The present invention relates to a method for improving image contrast in a perspective imaging system (10), and the perspective imaging system (10) thereof, wherein, the method comprises changing the energy of X-ray beam (35) to be incident on an object (40); acquiring a plurality of images (45) of the object (40), which correspond with different energies of the X-ray beam (35); and fusing at least one area of one or more images in the plurality of images (45) for obtaining the fused image (75) of the object (40).
Description
Technical field
The present invention relates to a kind of method and system for strengthening perspective imaging system picture contrast.
Background technology
A kind of imaging technique that perspective is normally used by the doctor is used for the real-time activity image by the use acquisition patient inner structure of fluoroscope.In the perspective process, X-ray beam sees through health.Image is sent to watch-dog so that can see in detail body part and motion thereof.Perspective shows that the ability of motion is provided by the continuous series image that maximal rate was produced with per second 25-30 frame complete image.This is similar to the mode of existing-quality television or video transmission image.
Usually, X-ray beam sees through the patient and interacts with patient's different internal structure.This forms the shade of inner structure so that X-ray beam is decayed to some extent with respect to different internal structure in image.Depend on its density and effective atomic number by the decay that inner structure provides.Because different internal structure provides differential declines, so the contrast of the image that gathers is lower.Therefore, the inner structure of different densities may well not exposed in image.
Summary of the invention
The objective of the invention is to strengthen the contrast of image in the perspective imaging system.
Purpose of the present invention is realized by a kind of method of picture contrast in the enhancing perspective imaging according to claim 1 system and a kind of perspective imaging according to claim 9 system, wherein, the method comprises: the energy that changes the X-ray beam on the object to be incided within a period of time; Gather a plurality of images of the object corresponding with the X-ray beam different-energy; And at least one zone of merging one or more images in described a plurality of image, to obtain the fused images of object.
The a plurality of images that gather of object are different exposures, and this is to gather these images because of the different-energy corresponding to X-ray beam.Therefore, based on the density of object inner structure, will in different images, catch according to density the highest details of object inner structure.By merging the zone of one or more images in these images, obtain the fused images of object.The zone of merging comprises the zone from the good exposure of these images.Therefore, the inner structure in the fused images all will well be exposed, and therefore, strengthen the contrast of image.
According to a kind of embodiment, change energy, so that gather at least one under-exposure image and at least one overexposure image in the period at this section.The different internal structure of the object X-ray beam of differently decaying.Therefore, gather at least one under-exposure image and at least one overexposure image and realize guaranteeing the well exposure at least one image of collection image of all interested inner structures.
According to another embodiment, use single X-ray tube to produce X-ray beam.The energy of the X-ray beam that change is produced by X-ray tube.
According to another embodiment, change the energy of X-ray beam by the voltage that changes X-ray tube.Change the voltage of X-ray tube to change the energy of the X-ray beam that produced.
According to another embodiment, in response to the control signal with the modulation of repetition modulation signal, change the voltage of X-ray tube.This control signal is used for controlling the voltage of X-ray tube, to guarantee that the average brightness value of the image that gathered is maintained in the range of stability.This guaranteed the good consistent quality of the image that gathers.With the control signal of the modulation signal modulation that repeats for the control x-ray tube voltage, within a period of time, to change the energy of X-ray beam.This provides the advantage that changes the X-ray beam energy with existing control technology.
According to another embodiment, the modulation of this control signal comprises in the group that is comprised of feedback signal and reference value with the modulation of this modulation signal.Feedback signal is indicated the value of following parameter, and in response to this parameter, the control x-ray tube voltage is held in the range of stability so that institute is gathered image dimension.Reference value is indicated following benchmark, and value of feedback is treated to compare with this benchmark.Control signal is the output signal of Dose Controller.Like this, because produce this control signal in response to feedback signal and reference value, so modulation feedback signal or reference value can both realize modulating this control signal with modulation signal.
According to another embodiment, this feedback signal provides the indication of the mean picture brightness value that gathers.In one implementation, for the fluoroscopy system that has Dose Controller in imaging and processing unit outside, average brightness value is offered Dose Controller, for generation of the voltage of control signal with the control X-ray tube, be held in the range of stability in order to institute is gathered image dimension.The feedback signal of therefore, modulating with this modulation signal can be corresponding with the average brightness value of collection image.
According to another embodiment, the fusion at least one zone of one or more images comprises that each pixel to these a plurality of images assigns weight in a plurality of images, wherein, assign weight according to the value of pixel and the degree of closeness of reference value, calculate the weighted mean of each pixel of a plurality of images, and, identify at least one zones of one or more images in these a plurality of images according to value and the corresponding weighted mean of pixel of the pixel of these a plurality of images.Give the weight allocation of each pixel so that can identify the pixel with non-overexposure or under exposed intensity.
Another embodiment comprises, a kind of perspective imaging system, and it comprises: can control to produce the x ray generator that incides the X-ray beam on the object, this X-ray beam is included in and changes energy in a period of time; And imaging and processing unit, it is configured to a plurality of images corresponding with different-energy X-ray beam acquisition target, and at least one zone of merging one or more images in a plurality of images, to obtain the fused images of this object.
Description of drawings
Below, the illustrational embodiment with reference to shown in the accompanying drawing further describes the present invention, in the accompanying drawing:
Fig. 1 shows the example block diagram according to the perspective imaging system of an embodiment of the present invention;
Fig. 2 shows a plurality of images of the object that gathers by the energy that changes X-ray beam according to an embodiment of the present invention;
Fig. 3 shows a plurality of weight map corresponding with a plurality of images according to an embodiment of the present invention;
Fig. 4 shows according to the example of an embodiment of the present invention by the fused images of at least one zone acquisition of the one or more images of fusion;
Fig. 5 shows the diagram according to the dynamic range of the X-ray beam of the dynamic range of the imaging sensor of the imaging of an embodiment of the present invention and processing unit and decay;
Fig. 6 shows the diagram of voltage and the average brightness value Relations Among of X-ray tube;
Fig. 7 shows the zoomed-in view of rectangle 90 on the curve of expression x-ray tube voltage;
Fig. 8 shows the according to another embodiment of the present invention example block diagram of perspective imaging system;
Fig. 9 shows the feedback regulation module details according to an embodiment of the present invention; And
Figure 10 is the process flow diagram that illustrates according to the method for picture contrast in the enhancing perspective imaging system of an embodiment of the present invention.
Embodiment
Below, describe different embodiments with reference to the accompanying drawings, use identical Reference numeral to refer to similar ingredient in institute's drawings attached.In describing hereinafter, for purposes of illustration, many details have been set forth, in order to the thorough understanding of one or more embodiments is provided.Obviously, do not have these specific detail, can put into practice these embodiments yet.
The solution of the present invention is based on the consecutive image that gathers in the situation that merges the energy that changes X-ray beam in a period of time, to obtain the having fused images that strengthens contrast.The image that gathers by change X-ray beam energy is differently exposed.Therefore, the image co-registration with the difference exposure has the fused images that strengthens contrast with acquisition.Change the energy of X-ray beam by the voltage that changes the X-ray tube that produces X-ray beam.Use single X-ray tube to produce the X-ray beam with change energy.Within a period of time, repeatedly change the voltage of X-ray tube to obtain consecutive image.Merge by the consecutive image that will gather in a period of time and to obtain fused images.
Fig. 1 shows the example block diagram according to the transmission imaging system of an embodiment of the present invention.Perspective imaging system 10 comprises x ray generator 15, image intensifier 20 and imaging and processing unit 25.X ray generator 15 comprises the X-ray tube 30 for generation of X-ray beam 35.For imaging object 40, X-ray beam 35 is incided on the object 40.X-ray beam 35 sees through object 40, and is decayed by object 40.X-ray beam 42 after the decay incides on the image intensifier 20.Image intensifier 20 is configured to, and converts the X-ray beam after the decay to image 45.Object 40 in this example is biological dissection, for example patient.Usually, the X-ray beam 42 after image intensifier 20 will be decayed converts visible light to.Imaging and processing unit 25 are configured to gather image 45 and the processing image 45 that is provided as output by image intensifier 20.In order to realize this point, according to a kind of example, imaging and processing unit 25 comprise imaging sensor 50, and it operationally is coupled with processor 55.Imaging sensor 50 is configured to, and the image 45 that is provided as output by image intensifier 20 is provided, and the image 45 that gathers is offered processor 55.Processor 55 is configured to, the image after processing image 45 and processing being provided to the display of processor 55 couplings, be used for image behind the Graphics Processing and/or the image after the stores processor in the storer place, be used for follow-up use.
Still with reference to Fig. 1, usually, in order to guarantee image 45 good consistent quality, imaging and processing unit 25 are configured to control the voltage of X-ray tube 30.In order to realize this point, imaging and processing unit 25 comprise Dose Controller 58, and this Dose Controller is configured to control the voltage of X-ray tube 30.In order to realize this point, with indication the feedback signal 60 of the image that gathers 45 parameter values offer Dose Controller 58.For example, the parameter that provides as feedback can be the average brightness value of the image that gathers 45.The reference value 62 that this parameter that provides in response to this feedback and with this feedback of conduct of image 45 is corresponding, the voltage of control X-ray tube 30.In the example of Fig. 1, processor 55 is configured to provide feedback signal 60 and reference value 62 to Dose Controller 58.Dose Controller is configured to, and output is in response to the control signal 72 of feedback signal 60 and reference value 62.Control signal 72 offers x ray generator 15 by imaging and processing unit 25, and the voltage of X-ray tube 30 can be controlled in response to this control signal 72.The voltage of control X-ray tube 30 is so that the average brightness value of the image that gathers 45 maintains in the range of stability.Here employed term range of stability is defined as the corresponding average brightness value scope of image 45 normal exposures.This realized guaranteeing the image that gathers 45 good consistent quality.
In the example of Fig. 1, only for example purposes, imaging and processing unit be illustrated as comprise independent Dose Controller 58.On the other hand, processor 55 can be configured to carry out the function of Dose Controller 58.
" processor " or " controller " is a kind of device when this uses, and be used for to carry out the machine readable instructions that is stored on the computer-readable medium executing the task, and can comprise any of hardware or firmware or its combination.For example, use microcontroller, microprocessor, electron device or carry out other electronic units or its combination of function described herein, can realize these processors or controller.The machine readable instruction fetch can be stored in processor or the controller, and it is outside perhaps to be stored in processor or processor.
Still with reference to Fig. 1, according to the embodiment here, control x ray generator 15 has the X-ray beam 35 of change energy to produce within a period of time, thereby gathers at least one under-exposure image 45 and at least one overexposure image 45.Term " under-exposure " and " overexposure " hereinafter specify with reference to Fig. 5.Term used herein " a period of time " referred to be used to the period that gathers a plurality of images 45 to be merged.Gather at least one under-exposure image and at least one overexposure image and realize producing the fused images (being shown 75 among Fig. 4) with enhancing contrast, this is because of the different-energy for X-ray beam 35, and the different internal structure of object 40 is well exposed.Here employed term energy refers to the peak energy of X-ray beam.Therefore, the X-ray beam 35 that produces comprises different-energy in different moments within a period of time.In order to realize this point, according on the one hand, change the energy of X-ray beam 35 by the voltage that changes X-ray tube 30.Within a period of time, repeatedly change continuously the voltage of X-ray tube 30, to produce X-ray beam 35.The variation voltage of X-ray tube 30 is implemented in the X-ray beam 35 that different moments generations have different-energy.Therefore, the X-ray beam 35 that produces is the X-ray beams that become power spectrum when having.
Still with reference to Fig. 1, according on the one hand, x ray generator 15 can be controlled to be the energy that the voltage that changes X-ray tube 35 in response to control signal 72 within a period of time changes X-ray beam 35.Therefore, use the voltage in response to its control X-ray tube 30 to change the voltage of X-ray tube with the control signal 72 of the good consistant mass of assurance image 45, thereby change the energy of X-ray beam 35.In the example of Fig. 1, imaging and processing unit 25 are configured to, and produce control signal 72, and provide this control signal 72 to x ray generator 15.According to one side, imaging and processing unit 25 are configured to, and produce control signal 72 to change the voltage of X-ray tube 30, so that gather at least one under-exposure image 45 and at least one overexposure image 45 within a period of time.According on the one hand, can control x ray generator 15 in response to control signal 72, so that the change of the voltage of X-ray tube 30, within a period of time, to produce at least one under-exposure image 45 and at least one overexposure image 45.Then, for next time period, this process be can repeat, under-exposure image 45 and overexposure image 45 organized to gather next.According to one side, can be with modulation signal (being shown 108 among Fig. 9) modulator control signal 72, so that gather in a period of time at least one under-exposure image 45 and at least one overexposure image 45.Modulation signal is a kind of repetitive sequence, and repeats within each time period.
According to one side, Dose Controller 58 is configured to produce this modulation signal.Advantageously, according to an aspect of the present invention, Dose Controller 58 is configured to produce this modulation signal, so that image 45 average brightness value separately that gathers with the energy of the variation of X-ray beam 35 maintains in the range of stability.Therefore, although change the energy of X-ray beam 35 in order to gather at least one under-exposure image 45 and at least one overexposure image 45, the average brightness value of the image that gathers 45 is in range of stability.This has realized obtaining the image of different exposures within a period of time, and still keeps image 45 in range of stability.For example, can produce this modulation signal, so that the average brightness value of image 45 changes near the average of range of stability.
Still with reference to Fig. 1, according on the one hand, also can be modulated control signal 72 by feedback signal 60 or reference value 62 that Dose Controller 58 receives by modulation.Advantageously, for can be by the system 10 of imaging and processing unit 25 control reference values 62, the reference value 62 of using this modulation signal to modulate to offer Dose Controller 58.In another is realized, can not control reference values 62 by imaging and processing unit 25, but use modulation signal can modulate the feedback signal 60 that offers Dose Controller 58.Therefore, can produce control signal 72 by modulation feedback signal 60 or reference value 62, be used within a period of time, changing the voltage of X-ray tube 30, to change the energy of X-ray beam 35.The advantage of coming modulator control signal 72 to provide by modulation feedback signal 60 or reference value 62 is to eliminate modulation signal for the adaptability requirement of object 40 inner structures.
Still with reference to Fig. 1, X-ray beam 35 incides on the object 40, and gathers formed a series of images 45 by imaging and processing unit 25 within a period of time.Because the energy variation of X-ray beam 35, the image series 45 that is gathered by image acquisition and processing unit 25 will be different exposures.Therefore, the image 45 of the difference exposure that gathers within a period of time will comprise different details, be overexposures such as some images 45, and some then are under exposed.
Still with reference to Fig. 1, as discussed previously, the contrast of object 40 inner structures depends on the energy of its density and X-ray beam 35 in the image 45.Along with the X-ray beam energy variation, some images are overexposures, and some then are under exposed.This has realized obtaining a series of overexposures and under exposed image 45.Therefore, based on the density of object 40 inner structures, in the image 45 that the particular energy in response to X-ray beam 35 gathers, catch the highest details of this object inner structure.Therefore, according to an aspect of the present invention, in order to confirm at least one image 45, to catch the highest details of inner structure, change the energy of X-ray beam 35, so that within a period of time, gather at least one under-exposure image 45 and at least one overexposure image 45.Dose Controller 58 is configured to produce modulation signal, so that the details of roughly all inner structures of object 40 is caught at least one under-exposure image and 45 realizations of at least one overexposure image.This specifies with reference to Fig. 5 hereinafter.
Still with reference to Fig. 1, according to an aspect of the present invention, imaging and processing unit 25 are configured to, and merge at least one zone of the one or more images 45 that gather, to obtain the fused images of object 40.These zones from the one or more images 45 that merged to obtain fused images are good exposure areas of image 45.Therefore, all details of fused images all will well be exposed, because merge from a plurality of images 45 that wherein make their good exposures in these zones.For example, can use Mei Teensi-Kao Ci-Fan Ruite (Mertens-Kautz-Van Reeth) exposure blending algorithm to merge these images 45.In order to realize this point, according to one side, imaging and processing unit 25 are configured to, and in response to the pixel value of image 45 and the degree of closeness of reference value, identify these zones.For example, can the selection reference value as the central value of intensity interval.This realizes that identification has the pixel that is not overexposure or under exposed brightness.In order to realize this point, according to one side, imaging and processing unit 25 are configured to, and based on the degree of closeness of pixel value and reference value, assign weight for each pixel of a plurality of images 45 that gather.Advantageously, imaging and processing unit 25 are configured to, and use can be determined by the Gaussian curve that following mathematical way represents the degree of closeness of pixel value and reference value:
Wherein, W is weighted value, and I is pixel value, and R is reference value, and σ is standard deviation.According to one side, imaging and processing unit 25 are configured to, and use the weighted value of the pixel of respective image 45, are each image weight generation figure.Hereinafter describe the weight map of image 45 in detail.Advantageously, imaging and processing unit 25 are configured to, and use the weight of determining into each pixel, calculate the weighted mean of each pixel of each image 45.According on the one hand, imaging and processing unit 25 are configured to weighted value normalization so that the weighted value of each pixel (i, j) of a plurality of image 45 and be 1.For example, use following equation, weighted value that can the normalization pixel:
Wherein
The pixel i of k image 45, the normalized value of the weight of j, and W
I, j, kBe k image 45 pixel i, the weighted value of j.
Still with reference to Fig. 1, according on the one hand, the weighted mean by the pixel of collection image 45 can obtain fused images.This can be expressed as by mathematical way:
Wherein, F
I, jThe pixel i of fused images, j, and I
I, j, kThe pixel i of k image 45, the intensity of j.The quality of the fused images that use equation (3) obtains may be unsatisfied with, because weighted value has quick variation anyplace, the disturbance seam all may occur.This contains different absolute strengties by image 45 and is caused, because used the X-ray beam 35 of different-energy to gather them.Therefore, advantageously, by seamless way fused images 45, can obtain fused images.For example, by using Bo Erte (Burt) and Andelson (Adelson) integration technology that the seamless blended image that image 45 is fused to image 45 can be realized this point.Bo Erte and Andelson integration technology have reduced the seam in the fused images, because come fused images 45 with feature rather than the intensity of image 45.
Fig. 2 shows according to an embodiment of the present a plurality of images 45 of the object 40 that gathers by the energy that changes X-ray beam 35.As discussed previously, change the energy of X-ray beam 35 by the voltage that changes X-ray tube 30.Image 45 shown in Fig. 2 example is images of people's knee of gathering of the different voltages according to X-ray tube 30.The image 45a that illustrates is the example of the voltage of X-ray tube 30 image that gathers when being 44kV.Similarly, image 45b, 45c, 45d, the 45e that illustrates is the example of the voltage of X-ray tube 30 image that gathers when being respectively 50kV, 57kV, 60kV and 66kV.Image 45a can be categorized as under exposed, and image 45e can be categorized as overexposure.Owing to image 45 is differently exposed, in each image 45, will differently catch the details of inner structure.For example, in image 45a, owing to having than low-density and image 45a, soft tissue 47a catches corresponding to having more low-energy X-ray beam 35, so capture the highest details of soft tissue 47a.In image 45c, catch the highest details of knee cap 47b.In Figure 45 e, catch the highest details of femur 47c and fibula 47d.Femur 47c and the fibula 47b of higher density are well exposed.In under-exposure image 45a, more low-density soft tissue 47a is well exposed.
Fig. 3 shows a plurality of weight Figure 48 corresponding with image 45 according to an embodiment of the present invention with reference to Fig. 2.Weight map 48a is corresponding to image 45e with the respective image 45a of Fig. 2 to weight map 48e., can observe to weight map 48e according to weight map 48a, clearly distribute to the weight of pixel so that can distinguish good exposure pixel and under-exposure pixel.For example, in weight map 48c, because knee cap 47b is well exposed, by being assigned mxm. around district 49c pixel weight corresponding to knee cap 47b Figure 45 c and Fig. 2 sign, Fig. 2.Similarly, all will be assigned mxm. by the weight around the pixel of district 49a, 49b, 49d, 49e sign among corresponding weight map 48a, 48b, 48d, the 48e because they with corresponding image 45a, 45b, 45d, 45e in the structural correspondence of corresponding good exposure.
The see figures.1.and.2 example of the fused images 75 that at least one zone of showing according to an embodiment of the present the one or more images 45 by merging Fig. 2 obtains of Fig. 4.In this example, can find out that fused images 75 comprises the highest details of soft tissue 47a, knee cap 47b, femur 47c and fibula 47d.Therefore, the contrast of fused images 75 is enhanced, and fused images 75 has the details of soft tissue 47a, knee cap 47b, femur 47c and the fibula 47d of good exposure.
Because obtain fused images 75 by merging consecutive image 45, if object 40 motions, then because consecutive image gathered in different moments, fused images 75 may have fuzzy.By using registration and interpolation technique at image 45, can reduce bluring in the fused images 75.
Fig. 5 shows diagram according to the dynamic range of the X-ray beam 42 of the dynamic range of the imaging sensor 50 of the imaging of an embodiment of the present invention and processing unit 25 and decay with reference to Fig. 1.X-ray beam 35 incides on the object 40.X-ray beam 35 sees through object 40, and produces decay X-ray beam 42 through object 40 decay.In the example shown in Fig. 5, can see that depend on the inner structure that X-ray beam is decayed of object 40, the X-ray beam 42 of decay comprises the photon of varying number.The varying number photon of the X-ray beam 42 of decay illustrates with the arrow that is designated 76.The photon that arrow 76a is corresponding is different to the corresponding photon numbers of arrow 76h from arrow 76b.The dynamic range of the imaging sensor 50 of imaging and processing unit 25 is shown responsive band, is designated 77.Dynamic range measurement is that the truth of a matter is 2 logarithm value.In the example shown in Fig. 5, sensitivity is with 77 to comprise 8 bits.Arrow 76b is with in 77 in the sensitivity of imaging sensor 50 to arrow 76f, therefore, will well expose in the result images 78 of being caught by imaging sensor 50, is shown regional 79b in the result images 78 to regional 79f.Arrow 76a is lower than the sensitivity of imaging sensor 50 and is with 77, therefore, will be under exposed in result images 78, shown in regional 79a.Arrow 76g and arrow 76h are higher than the sensitivity of imaging sensor 50 and are with 77, therefore, will be overexposure in result images 78, shown in regional 79g and regional 79h.Therefore, for object 40 will be for all inner structures of good exposure in the result images 78, require sensitivity at imaging sensor 50 with the 77 ITs photon corresponding with the inner structure of object 40.
Fig. 6 shows according to the variation voltage of the X-ray tube 30 of a kind of embodiment and the diagram of average brightness value Relations Among with reference to Fig. 1.In the example of Fig. 6, curve 80 expression voltages, and curve 85 expression average brightness values.Can find out according to curve 80 and curve 85, for the energy that the voltage that changes X-ray tube 30 changes X-ray beam 35, average brightness value be maintained near the average of range of stability.In this example, can find out that although the voltage that changes X-ray tube 30 is in order to change energy, average brightness value is kept and is in 0.5.This has realized obtaining by the voltage that changes X-ray tube 30 image of different exposures, and still average brightness value is maintained near the average of range of stability.
Fig. 7 shows the zoomed-in view of the rectangle 90 on the curve 80 with reference to Fig. 1 and Fig. 6.Rectangle 95 is zoomed-in views of rectangle 90 on the curve 80 of expression X-ray tube 30 voltages.In rectangle 95, can find out, for each flat region of curve 80, produce image 45.Each flat region of curve 80 is corresponding from different voltages, and therefore, the X-ray beam 35 that is produced by X-ray tube 30 has different-energy.Therefore, the respective image 45 that gathers will have different exposures owing to the different-energy of X-ray beam 35.
Fig. 8 shows the according to another embodiment of the present invention example block diagram of perspective imaging system 10.In the example depicted in fig. 8, the embodiment of perspective imaging system 10 comprises Dose Controller 58 in the outside of imaging and processing unit 25, is used for the voltage of control X-ray tube 30, with guarantee the image that gathered 45 good consistent quality.Dose Controller 58 is supplied with the feedback signal 60 of the parameter of the image that gathers 45, and be configured to control the voltage of X-ray tube 30, in order to gather successive image 45 based on the feedback of the parameter of the previous image 45 that gathers and the reference value 62 corresponding with the parameter of this feedback.This guarantees image 45 good consistent quality.
Still with reference to Fig. 8, in this system 10, Dose Controller 58 is in imaging and processing unit 25 outsides, and control signal 72 produces by Dose Controller 58, and imaging and processing unit 25 are configured to use modulation signal (as being shown 108 among Fig. 9) modulation feedback signal 60.Feedback signal 105 after the modulation is offered Dose Controller 58.In response to the feedback signal 105 after the modulation, Dose Controller 58 produces control signal 72.In order to realize this point, according to one side, imaging and processing unit 25 comprise feedback regulation module 100, are used for the feedback signal 105 after modulation feedback signal 60 and output are modulated.Feedback signal 105 after the modulation is offered Dose Controller 58 as feedback.Feedback regulation module 100 is configured to, the feedback signal 60 that gathers image 45 receptions modulated in response to each, and the feedback signal 105 after the modulation of output indication modulated feedback.According to one side, processor 55 provides feedback signal 60 to feedback regulation module 100.Dose Controller 58 is configured to, and the feedback signal 105 after the reception modulation and generation are in response to the control signal 72 of the feedback signal 105 after modulating.Therefore, based on by the value of feedback after the indicated modulation of the feedback signal 105 after the modulation, dosage adjuster 58 produces control signals 72.This has realized changing in response to the value of feedback of the parameter of collection image 45 voltage of X-ray tube 30.
Still with reference to Fig. 8, advantageously, feedback parameter is the mean flow rate of the image that gathers 45.This provides remodeling ground embodiment described in the invention to be implemented into the advantage that has in the existing fluoroscopy system of the Dose Controller 58 of imaging and processing unit 25 outsides.According to one side, feedback regulation module 100 can use a kind for the treatment of apparatus to realize that perhaps, processor 55 can be configured to carry out the function of feedback regulation module 100.For being included in imaging and system 10 processing unit 25 outsides, hardware based dosage adjuster 58, the feedback regulation module 100 that adds the average brightness value that is used for the definite image 45 of change realizes changing the voltage of X-ray tube 30 to change the energy of X-ray beam 35.
Fig. 9 shows feedback regulation module 100 details according to an embodiment of the present invention with reference to Fig. 8.Feedback regulation module 100 comprises totalizer 115, and it is configured to receive modulation signal 108 and feedback signal 60.Totalizer 115 is with feedback signal 60 and modulation signal 108 additions, and the feedback signal 105 after the output modulation.In the example of Fig. 9, modulation signal 108 is produced by feedback regulation module 100.Can find out, in the example of Fig. 9, modulation signal 108 be repeated.
Figure 10 is a kind of process flow diagram referring to figs. 1 through Fig. 9, shows the method according to picture contrast in the enhancing perspective imaging system 10 of an embodiment of the present invention.In piece 120, change the energy of the X-ray beam 35 on the object to be incided in a period of time.Then, in piece 125, a plurality of images 45 that the different-energy with X-ray beam 35 of acquisition target 40 is corresponding.In piece 130, at least one zone of one or more images in a plurality of images 45 is merged, to obtain the fused images 75 of object 40.
The form that embodiments of the present invention can be taked has complete hardware implementation, complete implement software or comprise the two enforcement of hardware and software.Embodiment with implement software includes but are not limited to: firmware, resident software, microcode etc.
In addition, the form that embodiments of the present invention can be taked have can from computing machine can with or the computer program of computer-readable medium access, it is provided for the program code that used or be combined with it by computing machine or any instruction execution system.The purpose that is used for this instructions, computing machine can with or computer-readable medium can be any such as lower device, these devices can comprise, store, communicate by letter, propagate or transmit and are fit to the program being used or be combined with it by instruction execution system, device or device.
Medium can be electronics, magnetic, optics, electromagnetism, infrared or semiconductor system (or equipment or device) or propagation medium.The example of computer-readable medium comprises semiconductor or solid-state memory, tape, erasable computer disk, random-access memory (ram), ROM (read-only memory) (ROM), hard disc and CD.The current example of CD comprises compact disk-ROM (read-only memory) (CD-ROM), compact disk-read/write (CD-R/W) and DVD.
Be suitable for storing and/or the data handling system of executive routine code comprises at least one processor that directly or indirectly is coupled to memory component by system bus.Memory component can be included in local storage, mass storage and the memory buffer that program code adopts actual the term of execution, memory buffer provides the interim storage of at least some program codes, must be from the number of times of mass storage retrieval coding term of execution of with minimizing.
I/O (I/O) device (including, but not limited to keyboard, display, pointing device etc.) can be directly or the I/O controller by between two parties be coupled to system.Network adapter also can be coupled to system, so that data handling system can be coupled to other data handling system or remote printer or memory storage by special use or public network between two parties.Modulator-demodular unit, cable modem and Ethernet card are the network adapter of some present available types.
Embodiment described herein is so that can strengthen the contrast of image in the perspective imaging system.The different internal structure of object is well exposed, and this is because use the image of different exposures to generate fused images.The image of different exposures is so that can catch the highest details of different densities inner structure.Change the voltage of X-ray tube by changing average brightness value, to produce the image of different exposures.Use single X-ray tube to produce the X-ray beam with energy variation.In addition, average brightness value is approximately maintained in the stable region.This energy that has guaranteed the change X-ray beam still can be kept good consistent picture quality.In addition, the adding of feedback regulation module is so that can change the energy of X-ray beam, with the mean flow rate of the control image that gathered in the system that comprises hardware based dosage adjuster.The feedback regulation module can be retrofited to the existing system that comprises hardware based dosage adjuster.For the system that imaging and processing unit are configured to control mean picture brightness, imaging and processing unit can be configured to change the voltage that average brightness value changes X-ray tube.
Although describe the present invention in detail with reference to some preferred implementations, should be appreciated that the present invention is not limited to these definite embodiments.On the contrary, consider and described the disclosure that is used for putting into practice current optimization model of the present invention that many improvement projects and flexible program will present oneself and do not depart from scope of the present invention and spirit to those skilled in the art.Therefore, scope of the present invention is defined by the following claims, but not is limited by the explanation of front.All changes, improvement project and the flexible program done in the meaning of the equivalent of these claims and scope all should be considered within the scope of the appended claims.
Claims (16)
1. method that strengthens picture contrast in the perspective imaging system (10), described method comprises:
-within a period of time, change the energy of the X-ray beam (35) on the object to be incided (40),
-gather the corresponding a plurality of images (45) of the different-energy with described X-ray beam (35) of described object (40), and
-merge at least one zone of one or more images in described a plurality of images (45), with the fused images (75) that obtains described object (40).
2. method according to claim 1 wherein, changes described energy, so that gather at least one under-exposure image (45) and at least one overexposure image (45) within described a period of time.
3. method according to claim 1 and 2 wherein, uses single X-ray tube (30) to produce described X-ray beam (35).
4. method according to claim 3 wherein, changes the energy of described X-ray beam (35) by the voltage that changes described X-ray tube (30).
5. method according to claim 4 wherein, changes the voltage of described X-ray tube (30) in response to the control signal (72) with modulation signal (108) modulation that repeats.
6. method according to claim 5, wherein, the modulation of described control signal (72) comprises in the group that is comprised of feedback signal (60) and reference value (62) with described modulation signal (108) modulation.
7. method according to claim 6, wherein, described feedback signal (50) provides the indication to the average brightness value of the described image (45) that gathers.
8. the described method of each claim in 7 according to claim 1, wherein, the fusion at least one zone of one or more images comprises in described a plurality of images (45):
-assign weight for each pixel of described a plurality of images (45), wherein, described weight is distributed according to the degree of closeness of the value of described pixel and reference value,
The weighted mean of each pixel of the described a plurality of images of-calculating (45), and
-identify at least one zone of one or more images in described a plurality of image (45) according to the corresponding weighted mean of the value of the pixel of described a plurality of images (45) and pixel.
9. a perspective imaging system (10) comprising:
-x ray generator (15) can be controlled to be the X-ray beam (35) that produces on the object to be incided (40), and described X-ray beam (35) is included in the energy that changes in a period of time, and
-imaging and processing unit (25), be configured to gather the corresponding a plurality of images (45) of the different-energy with described X-ray beam (35) of described object (40), and merge at least one zone of one or more images in described a plurality of image (45), with the fused images (75) that obtains described object (40).
10. system according to claim 9, wherein, x ray generator (15) can be controlled to be the described X-ray beam (35) that produces the energy that comprises variation, so that gather at least one under-exposure image (45) and at least one overexposure image (45) within described a period of time.
11. according to claim 9 or 10 described systems, wherein, described x ray generator (15) comprises single X-ray tube (30).
12. the described system of each claim in 11 according to claim 9, wherein, described x ray generator (15) can be controlled to be in response to the control signal with modulation signal (108) modulation that repeats and change voltage to change the energy of described X-ray beam (35) (72).
13. system according to claim 12 wherein, produces described control signal (72) by of modulating in the group that is comprised of feedback signal (60) and reference value (62) with described modulation signal (108).
14. system according to claim 13, wherein, described imaging and processing unit (25) are configured to produce described control signal (72).
15. each described system in 13 according to claim 12, wherein, described imaging and processing unit (25) further comprise feedback regulation module (100), described feedback regulation module structure becomes to modulate described feedback signal (60) with described modulation signal (108), and the feedback signal (105) after the output modulation.
16. system according to claim 15, further comprise dosage adjuster (58), described dosage adjuster is configured to receive the feedback signal (105) after the described modulation, and produces described control signal (72) in response to the feedback signal after the described modulation (105).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IN424/KOL/2012 | 2012-04-12 | ||
| IN424KO2012 | 2012-04-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103377466A true CN103377466A (en) | 2013-10-30 |
Family
ID=49462535
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013101223712A Pending CN103377466A (en) | 2012-04-12 | 2013-04-10 | Method and system for improving image contrast in perspective imaging system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103377466A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104287750A (en) * | 2013-07-16 | 2015-01-21 | 南京普爱射线影像设备有限公司 | X-ray machine automatic perspective method and device based on embedded software |
| CN115227569A (en) * | 2022-06-23 | 2022-10-25 | 齐齐哈尔市祥和中医器械有限责任公司 | Human body acupuncture point identification method and system based on reality and virtuality |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020154802A1 (en) * | 2001-04-24 | 2002-10-24 | Siemens Elema Ab | Apparatus for and method of generating an enhanced contrast information digital image |
| US6768784B1 (en) * | 2001-11-07 | 2004-07-27 | Koninklijke Philips Electronics N.V. | X-ray image enhancement |
| CN1775177A (en) * | 2004-11-19 | 2006-05-24 | 通用电气公司 | CT colonography system |
| CN101308102A (en) * | 2008-07-16 | 2008-11-19 | 中北大学 | Computer tomography scanned imagery apparatus and method |
| US7840066B1 (en) * | 2005-11-15 | 2010-11-23 | University Of Tennessee Research Foundation | Method of enhancing a digital image by gray-level grouping |
-
2013
- 2013-04-10 CN CN2013101223712A patent/CN103377466A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020154802A1 (en) * | 2001-04-24 | 2002-10-24 | Siemens Elema Ab | Apparatus for and method of generating an enhanced contrast information digital image |
| US6768784B1 (en) * | 2001-11-07 | 2004-07-27 | Koninklijke Philips Electronics N.V. | X-ray image enhancement |
| CN1775177A (en) * | 2004-11-19 | 2006-05-24 | 通用电气公司 | CT colonography system |
| US7840066B1 (en) * | 2005-11-15 | 2010-11-23 | University Of Tennessee Research Foundation | Method of enhancing a digital image by gray-level grouping |
| CN101308102A (en) * | 2008-07-16 | 2008-11-19 | 中北大学 | Computer tomography scanned imagery apparatus and method |
Non-Patent Citations (1)
| Title |
|---|
| 段彦杰: "变能量X射线扫描成像技术研究", 《中国优秀硕士学位论文全文数据库信息科技辑》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104287750A (en) * | 2013-07-16 | 2015-01-21 | 南京普爱射线影像设备有限公司 | X-ray machine automatic perspective method and device based on embedded software |
| CN115227569A (en) * | 2022-06-23 | 2022-10-25 | 齐齐哈尔市祥和中医器械有限责任公司 | Human body acupuncture point identification method and system based on reality and virtuality |
| CN115227569B (en) * | 2022-06-23 | 2024-02-23 | 齐齐哈尔市祥和中医器械有限责任公司 | Human body acupoint recognition system based on reality and virtualization |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Fauber | Radiographic Imaging and Exposure-E-Book: Radiographic Imaging and Exposure-E-Book | |
| Suetens | Fundamentals of medical imaging | |
| Seeram et al. | Digital radiography | |
| Sisniega et al. | Monte Carlo study of the effects of system geometry and antiscatter grids on cone‐beam CT scatter distributions | |
| Schüller et al. | Segmentation‐free empirical beam hardening correction for CT | |
| Dougherty | Digital image processing for medical applications | |
| Thing et al. | Hounsfield unit recovery in clinical cone beam CT images of the thorax acquired for image guided radiation therapy | |
| US20170156690A1 (en) | Techniques for Suppression of Motion Artifacts in Medical Imaging | |
| Bai et al. | Phantom evaluation of a cardiac SPECT/VCT system that uses a common set of solid-state detectors for both emission and transmission scans | |
| CN103156629A (en) | Image processing apparatus, image processing method, and program | |
| Ay et al. | Assessment of errors caused by x-ray scatter and use of contrast medium when using CT-based attenuation correction in PET | |
| Szczykutowicz et al. | Experimental realization of fluence field modulated CT using digital beam attenuation | |
| CN105962959A (en) | Creating a resultant image for a specifiable, virtual X-ray quanta energy distribution | |
| Söderman et al. | Image quality dependency on system configuration and tube voltage in chest tomosynthesis—a visual grading study using an anthropomorphic chest phantom | |
| Hsieh et al. | Dose reduction using a dynamic, piecewise‐linear attenuator | |
| Xu et al. | Evaluation of detector readout gain mode and bowtie filters for cone-beam CT imaging of the head | |
| Brousmiche et al. | Combined influence of CT random noise and HU-RSP calibration curve nonlinearities on proton range systematic errors | |
| CN103860185A (en) | Determination of a multi-energy image | |
| Alves et al. | Association between subjective evaluation and physical parameters for radiographic images optimization | |
| Li et al. | X-ray photon-counting data correction through deep learning | |
| US11158050B2 (en) | Bone suppression for chest radiographs using deep learning | |
| Darne et al. | A proton imaging system using a volumetric liquid scintillator: a preliminary study | |
| CN103377466A (en) | Method and system for improving image contrast in perspective imaging system | |
| Carroll | Digital Radiography in Practice | |
| Sharma et al. | A GPU-accelerated framework for rapid estimation of scanner-specific scatter in CT for virtual imaging trials |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20131030 |