CN104586421A - Method and device for eliminating positioning eccentricity - Google Patents
Method and device for eliminating positioning eccentricity Download PDFInfo
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- CN104586421A CN104586421A CN201410851554.2A CN201410851554A CN104586421A CN 104586421 A CN104586421 A CN 104586421A CN 201410851554 A CN201410851554 A CN 201410851554A CN 104586421 A CN104586421 A CN 104586421A
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Abstract
The embodiment of the invention discloses a method and device for eliminating positioning eccentricity. The method comprises the following steps that the vertical height difference between the rotating center of a CT (computed tomography) scanning system and an interested region center of a scanned human body is calculated; the vertical height of a scanning bed of the CT scanning system is regulated according to the vertical height difference for eliminating the positioning eccentricity. The method and the device have the advantages that when the center of the interested region center of the scanned body is not coincident with the rotating center of the CT scanning system, the vertical height of the scanning bed is regulated, the positioning eccentricity is eliminated, and finally, the image scanning quality is improved. In addition, when the interested region is the heart of the human body or a region near the heart of the human body, the positioning eccentricity can also be eliminated by the method and the device, the time resolution is improved, and the image scanning quality of the heart is finally improved.
Description
Technical field
The present invention relates to medicine technology field, be specifically related to a kind ofly eliminate the method and apparatus putting the biased heart.
Background technology
When CT conventional sweep, ideally, by the area-of-interest of scanning human body (English: regionof interest, abbreviation: ROI) center should overlap with the center of rotation of CT scan system, the uninfluenced situation in pendulum position namely in CT scan process.Wherein, can be scanned in the plain film image of human body chosen by posting at this by user by the area-of-interest of scanning human body.Both can be whole human body, also can be the entire scope of the partial cut-away chosen along human body Z-direction, as shown in Figure 1, for the entire scope of partial cut-away chosen is as the schematic diagram of area-of-interest.In addition, can also be the subrange of the partial cut-away chosen along human body Z-direction, as shown in Figure 2, for the subrange of partial cut-away chosen is as the schematic diagram of area-of-interest.
When the heart biased by the pendulum of the area-of-interest of scanning human body, that is, do not overlapped with the center of rotation of CT scan system by the region of interest centers of scanning human body, the scanning dose by scanning the area-of-interest of human body can be caused uneven, thus make picture noise inconsistent, increase the use of effective dose simultaneously, reduce the effective rate of utilization of scanning dose.In addition, when area-of-interest is heart or the heart near zone of human body, puts the biased heart and temporal resolution can be caused to decline, finally cause the scanogram quality of heart to reduce.
Summary of the invention
In view of this, the invention provides and a kind ofly eliminate in scanning the method and apparatus putting the biased heart.
Provided by the inventionly a kind ofly eliminate the method for putting the biased heart, described method comprises:
Calculate the vertical drop by the scanning region of interest centers of human body and the center of rotation of CT scan system;
According to described vertical drop, adjust the scanning bed vertical height of described CT scan system, to eliminate the biased heart of pendulum.
Preferably, when the described area-of-interest by scanning human body is the entire scope of people's body section, described calculating is scanned the vertical drop of the center of rotation of the region of interest centers of human body and CT scan system, comprising:
After being carried out the scanning of plain film lateral projection by people's body section of scanning human body, obtain the raw data of plain film of described people's body section;
According to the raw data of described plain film, determine the detector channel that the barycenter of described people's body section is corresponding;
Judge whether the distance between the detector channel that the central passage of described detector is corresponding with described barycenter is greater than predetermined threshold value, if so, then determine that the barycenter of described people's body section departs from the deviation angle of described center of rotation;
According to described deviation angle, calculate the barycenter of described people's body section and the vertical drop of described center of rotation.
Preferably, when the described area-of-interest by scanning human body is the entire scope of people's body section, described calculating is scanned the vertical drop of the center of rotation of the region of interest centers of human body and CT scan system, comprising:
After being carried out the scanning of plain film lateral projection by people's body section of scanning human body, obtain the plain film image of described people's body section;
According to described plain film image, determine described by the vertical height of the peak of people's body section of scanning human body;
According to the vertical height of peak and the vertical height of minimum point of described people's body section, calculate the vertical height at the center of described people's body section, the center of described people's body section is the mid point of the highs and lows of described people's body section, or is the centroid position of pixel between described peak and described minimum point;
The difference of the vertical height calculating the center of described people's body section and the vertical height of the center of rotation of CT scan system prestored.
Preferably, when the described area-of-interest by scanning human body is the subrange of people's body section, described calculating is scanned the vertical drop of the center of rotation of the region of interest centers of human body and CT scan system, comprising:
Calculate described by the vertical height at the center of the area-of-interest of scanning human body;
The difference of the vertical height calculating the center of described area-of-interest and the vertical height of the center of rotation of CT scan system prestored.
Preferably, when described by scanning human body area-of-interest be heart or heart near zone time, described calculating is scanned the vertical drop of the center of rotation of the region of interest centers of human body and CT scan system, comprising:
After being carried out the scanning of plain film lateral projection by people's body section of scanning human body, obtain the plain film image of described people's body section;
Iamge Segmentation process is carried out to described plain film image, obtains the image that described area-of-interest is corresponding;
Calculate the vertical height of the barycenter of image corresponding to described area-of-interest, and the vertical height of described barycenter is defined as the vertical height at the center of described area-of-interest;
The difference of the vertical height calculating the center of described area-of-interest and the vertical height of the center of rotation of CT scan system prestored.
Present invention also offers and a kind ofly eliminate the device putting the biased heart, described device comprises:
Computing module, for calculating the vertical drop by the scanning region of interest centers of human body and the center of rotation of CT scan system;
Adjusting module, for according to described vertical drop, adjusts the scanning bed vertical height of described CT scan system, to eliminate the biased heart of pendulum.
Preferably, described computing module comprises:
First scanning submodule, for when the described area-of-interest by scanning human body is the entire scope of people's body section, after being carried out the scanning of plain film lateral projection by people's body section of scanning human body, obtains the raw data of plain film of described people's body section;
First determines submodule, for according to the raw data of described plain film, determines the detector channel that the barycenter of described people's body section is corresponding;
First judges submodule, for judging whether the distance between the detector channel that the central passage of described detector is corresponding with described barycenter is greater than predetermined threshold value;
Second determines submodule, for when described first judges the result of submodule as being, determines that the barycenter of described people's body section departs from the deviation angle of described center of rotation;
First calculating sub module, for according to described deviation angle, calculates the barycenter of described people's body section and the vertical drop of described center of rotation.
Preferably, described computing module comprises:
Second scanning submodule, for when the described area-of-interest by scanning human body is the entire scope of people's body section, after being carried out the scanning of plain film lateral projection by people's body section of scanning human body, obtains the plain film image of described people's body section;
3rd determines submodule, for according to described plain film image, determines described by the vertical height of the peak of people's body section of scanning human body;
Second calculating sub module, for according to the vertical height of peak of described people's body section and the vertical height of minimum point, calculate the vertical height of the barycenter of described people's body section, the barycenter of described people's body section is the mid point of the highs and lows of described people's body section, or is the centroid position of pixel between described peak and described minimum point;
3rd calculating sub module, for the vertical height that calculates the barycenter of the described people's body section difference with the vertical height of the center of rotation of the CT scan system prestored.
Preferably, described computing module comprises:
4th calculating sub module, for when the described area-of-interest by scanning human body is the subrange of people's body section, calculates described by the vertical height at the center of the area-of-interest of scanning human body;
5th calculating sub module, for the vertical height that calculates the center of the described area-of-interest difference with the vertical height of the center of rotation of the CT scan system prestored.
Preferably, described computing module comprises:
3rd scanning submodule, for when the described area-of-interest by scanning human body be heart or heart near zone time, to being scanned after people's body section of human body carries out the scanning of plain film lateral projection, obtain the plain film image of described people's body section;
Process submodule, for carrying out Iamge Segmentation process to described plain film image, obtains the image that described area-of-interest is corresponding;
6th calculating sub module, for calculating the vertical height of the barycenter of image corresponding to described area-of-interest, and is defined as the vertical height at the center of described area-of-interest by the vertical height of described barycenter;
7th calculating sub module, for the vertical height that calculates the center of the described area-of-interest difference with the vertical height of the center of rotation of the CT scan system prestored.
In the present invention, first calculate the vertical drop by the scanning region of interest centers of human body and the center of rotation of CT scan system.Secondly, according to described vertical drop, adjust the scanning bed vertical height of described CT scan system, to eliminate the biased heart of pendulum.The present invention, not overlapped with the center of rotation of CT scan system by the region of interest centers of scanning human body, adjusts scanning bed vertical height, eliminates the biased heart of pendulum, finally makes the quality of scanogram be improved.In addition, when area-of-interest is heart or the heart near zone of human body, the present invention also can eliminate the biased heart of pendulum, improves temporal resolution, finally makes the scanogram Quality advance of heart.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present application, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the application, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram of entire scope as area-of-interest of the partial cut-away chosen;
Fig. 2 is the schematic diagram of subrange as area-of-interest of the partial cut-away chosen;
Fig. 3 is the scanning schematic diagram under certain X-ray projection angle;
Fig. 4 be scanning human body before the graph of relation of each intensity of bar ray and the projection angle of X-ray;
Fig. 5 is the graph of relation of the projection angle of the X-ray intensity that receives of detector and X-ray after scanning human body;
What Fig. 6 provided for the embodiment of the present invention a kind ofly eliminates the method flow diagram putting the biased heart;
Fig. 7 is by scanning body scans schematic diagram.
Fig. 8 is the attenuation curve obtaining the X-ray that each channel reception of detector arrives according to the raw data of described plain film;
Fig. 9 calculates the principle schematic by the vertical dimension of the misalignment center of rotation of scanning human body;
Figure 10 calculates the principle schematic by the vertical height at the center of scanning human body;
What Figure 11 provided for the embodiment of the present invention a kind ofly eliminates the apparatus structure schematic diagram putting the biased heart.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present application, be clearly and completely described the technical scheme in the embodiment of the present application, obviously, described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the application's protection.
When CT conventional sweep, under normal circumstances, as shown in Figure 3, be the scanning schematic diagram under certain X-ray projection angle.Wherein, by the center of rotation being centrally located at CT scan system of scanning human body.By in the X-ray fladellum of shape filter, the intensity of each bar ray and the projection angle of X-ray are as shown in Figure 4.The distance passed through in shape filter due to central ray is the shortest, so the intensity of central ray is maximum.And the X-ray intensity of central ray both sides is more and more less, because they are more and more longer through the distance of shape filter.Owing to being scanned the center of rotation being centrally located at CT scan system of human body, so central ray is right through being scanned the center of human body, so just make in fladellum ray, the maximum ray of intensity is also the longest by the path of human body, and intensity less ray in both sides is also less by the path of human body, the relation of the X-ray intensity finally received at detector and the projection angle of X-ray as shown in Figure 5, is similar to horizontal line.This can improve the noise concordance of final scanogram, and effectively reduces total scanning dose.
When being put the biased heart by scanning human body, namely inconsistent by the center of rotation of the center of scanning human body and CT scan system, if shape filter is constant, then through by the ray at center of scanning human body not being the maximum X-ray of intensity in fladellum, so the X-ray of each projection angle that receives of detector is slightly inconsistent, finally cause the noise concordance of scanogram to reduce, picture quality is affected.
Embodiment of the present invention proposition is a kind of eliminates the method for putting the biased heart, when being put the biased heart by the area-of-interest of scanning human body, positioned by its plain film lateral projection center to described area-of-interest, calculate the distance of described area-of-interest bias, and automatically adjustment is scanning bed, makes the center of described area-of-interest move to the center of rotation of CT scan system, final formula scanned dosage that human body accepts evenly, while reducing effective dose, improve the noise concordance of scanogram.
With reference to figure 6, the method flow diagram of the biased heart is put in the elimination provided for the embodiment of the present invention, and described method comprises:
S601: calculate the vertical drop by the scanning region of interest centers of human body and the center of rotation of CT scan system.
In order to eliminate in scanning by the biased heart of pendulum of scanning human body, the embodiment of the present invention needs to calculate by the scanning center of area-of-interest of human body and the vertical drop of the center of rotation of CT scan system.In practical application, the mode calculating described vertical drop is more, is only described below three kinds of modes in the embodiment of the present invention, but is actually not limited to three kinds of modes.
The first:
This mode described area-of-interest by scanning human body be applicable in Fig. 1 is the situation of the entire scope of people's body section.Concrete, first to after being carried out the scanning of plain film lateral projection by people's body section of scanning human body, obtain the raw data of plain film of described people's body section.Secondly, according to the raw data of described plain film, the detector channel that the barycenter of described people's body section is corresponding is determined.Again, judge whether the distance between the detector channel that the central passage of described detector is corresponding with described barycenter is greater than predetermined threshold value, if so, then determine that the barycenter of described people's body section departs from the channel number of described center of rotation.Finally, according to described channel number, calculate the barycenter of described people's body section and the vertical drop of described center of rotation.
In practical application, as shown in Figure 7, for being scanned body scans schematic diagram.Wherein, ellipse representation is scanned the cross section of human body, and human body lies low on scanning bed, and the scanning of plain film lateral projection scans from by the side of scanning human body.The raw data of the plain film obtaining scanning by detector, and the attenuation curve obtaining the X-ray that each channel reception of detector arrives according to the raw data of described plain film, as shown in Figure 8, abscissa represents the decay of X-ray, and vertical coordinate represents the channel number of detector.Then, according to the attenuation curve of described X-ray, determine that the X-ray attenuation degree which channel reception of detector arrives is the highest, using this channel number as the passage corresponding with the barycenter of described people's body section.Normally by scanning human body pendulum position uninfluenced situation, this passage should the central passage of detector just.So, around this principle, can determine whether scanned human body puts the biased heart.
Concrete, when determining passage corresponding to the barycenter of people's body section, first can obtain the attenuation curve of the X-ray of all tangent planes of described people's body section, that is, plain film scans the raw data of the plain film obtained and is made up of M tangent plane, and each tangent plane is obtained by N number of detector channel collection, namely
rawdata＝{p
00,p
01,p
02,......,p
ij,......},i＝0,1,2,3,......,M-1,j＝0,1,2,3......,N-1；
Wherein, p
ijrepresent the raw data of plain film that i-th tangent plane is arrived by a jth channel acquisition, rawdata represents the raw data of the plain film of described human body tangent plane.
Secondly, based on the raw data of the plain film obtained, the passage at the barycenter place of all tangent planes of described people's body section is calculated:
Wherein, X
mfor the passage at barycenter place, i is the mark of tangent plane, and j represents the mark of passage.
Then, the passage X that described barycenter is corresponding is judged
mwhether should be in the central passage position of detector, or the deviation of the two whether less (being less than a predetermined threshold value), if so, then determine described not eccentric by scanning human body pendulum position; Otherwise, think described and put the biased heart by scanning human body.
When being put the biased heart by scanning human body, the passage that barycenter is corresponding and the port number that central passage departs from are:
therefore by the angle [alpha] that the barycenter of scanning human body departs from center of rotation be:
Wherein, the overall channel number of N detector, β is the fan angle of whole passage.
As shown in Figure 9, for calculating by the principle schematic of the vertical dimension of the misalignment center of rotation of scanning human body.Wherein, the radius of turn pre-setting CT scan system is r, then by the vertical dimension h of the misalignment center of rotation of scanning human body be:
The second:
This mode described area-of-interest by scanning human body be also applicable in Fig. 1 is the situation of the entire scope of people's body section.Concrete, first to after being carried out the scanning of plain film lateral projection by people's body section of scanning human body, obtain the plain film image of described people's body section.Secondly, according to described plain film image, determine described by the vertical height of the peak of people's body section of scanning human body.Again, according to the vertical height of the peak of described people's body section and the vertical height of the minimum point that prestores, calculate the vertical height of the barycenter of described people's body section, the barycenter of described people's body section is the mid point of the highs and lows of described people's body section.Finally, the difference of the vertical height calculating the barycenter of described people's body section and the vertical height of the center of rotation of CT scan system prestored.
In practical application, precalculate by the vertical height of the scanning bed mattress surface of scanning human contact.As shown in Figure 10, wherein, 1 is scanning holes, and 2 is light source, and 3 is detector, and 4 is scanning bed, and 5 is human body; The height of bed at scanning bed center position place is H1, and bed board thickness is D1, and mattress thicknesses is D2, be then H2 by the vertical height of scanning bed mattress surface of scanning human contact, concrete account form: H2=H1+ (D1/2)+D2.Due to can be approximately equal to by the vertical height H5 at center of scanning human body described by the center of scanning human body at the peak of chest and describedly scanned the middle of the scanning bed mattress surface of human contact.So, also need below calculate described by scanning human body center at the vertical height H3 of the peak of chest, the size of H5 could be determined.
The present embodiment also needs to carry out the scanning of plain film lateral projection to by people's body section of scanning human body, obtains the plain film image of described people's body section.Described plain film image is regarded as the coordinate system of a pixel, the non-vanishing point of each pixel namely on described plain film image all has one's own coordinate figure.Concrete, determine the vertical coordinate P1 of the peak of described plain film image, the point that namely vertical coordinate is maximum.Determine the vertical coordinate P that the center of rotation of CT scan system is corresponding.Simultaneously, determine each pixel length D3 in the vertical direction, concrete, pre-determine described plain film image visual field FOV in vertical direction length be FOV1, and the matrix size of described plain film image is known, simultaneously its pixel number is in vertical direction P.Then can calculate each pixel physical length D3=FOV1/P in vertical direction.Concrete, can be calculated described by the vertical height of the center of scanning human body at the peak of chest by above parameter, formula is as follows:
H3＝H4+(P1-P/2)*(FOV1/P)；
Wherein, H3 represents described by the vertical height of the center of scanning human body at the peak of chest; H4 represents the vertical height of the center of rotation of default CT scan system.
Then, in order to calculate the vertical height of the center of rotation of described CT scan system and describedly be scanned the vertical height at the center of human body.The present embodiment also needs to calculate described by the vertical height at the center of scanning human body.As shown in Figure 10, the described vertical height by the center of scanning human body equals the height of the central point of H3 and H2:
H5＝(H3+H2)/2；
Wherein, H3 represents described by the vertical height of the center of scanning human body at the peak of chest; H2 is described by the vertical height of the scanning bed mattress surface of scanning human contact.
In addition, the center of people's body section also can be the centroid position of the pixel between described peak and described minimum point, that is, can be determined the size of H5 by the centroid position calculating the pixel between the peak of described people's body section and minimum point.
Finally, calculate the difference of H5 and H4, and the difference of the vertical height this difference being defined as the center of described people's body section and the vertical height of the center of rotation of the CT scan system prestored.
The third:
This mode described area-of-interest by scanning human body that can simultaneously be applicable in Fig. 1 is the situation of the entire scope of people's body section, and the described area-of-interest by scanning human body in Fig. 2 is the situation of the subrange of people's body section.Concrete, first the method according to by the posting of scanning human body, calculates described by the vertical height at the center of the area-of-interest of scanning human body.Secondly, the difference of the vertical height calculating the center of described area-of-interest and the vertical height of the center of rotation of the CT scan system prestored.
In practical application, directly regard the described center by the posting of scanning human body as described by the center of people's body section of scanning human body.That is, by the vertical height and the difference of the vertical height of the center of rotation of the CT scan system prestored that calculate the center of described posting, determine described whether eccentric by scanning human body pendulum position.
Concrete, after the scanning of plain film lateral projection is carried out to the described human body tomography by scanning human body, obtain plain film image.Area-of-interest chosen by the posting that user understands in dragged image, with by the central authorities of area-of-interest circle at posting.We can think that the center of area-of-interest is located in the center of posting, can estimate the vertical dimension of the misalignment center of rotation of area-of-interest accordingly.After supposing that user drags posting, the lower edges vertical coordinate in the picture of posting is respectively P2, P3, then the vertical coordinate at posting center is (P2+P3)/2, if the vertical height at posting center is H6, then and the vertical dimension h of the misalignment center of rotation of compute location frame:
h＝H6-H4＝((P2+P3)/2-P/2)*(FOV1/P)；
Wherein, H4 represents the vertical height of the center of rotation of default CT scan system.
In addition, when the described area-of-interest by scanning human body be heart or heart near zone time, owing to being put the biased heart temporal resolution can be caused to reduce by scanning human body, and then make the scanogram of heart second-rate.
For being the situation of heart or heart near zone by the area-of-interest of scanning human body, the present embodiment to after being carried out the scanning of plain film lateral projection by people's body section of scanning human body, can obtain the plain film image of described people's body section.Secondly, Iamge Segmentation process is carried out to described plain film image, obtains the image that described area-of-interest is corresponding, the image that namely heart is corresponding.Calculate the vertical height of the barycenter of image corresponding to described area-of-interest, and the vertical height of described barycenter is defined as the vertical height at the center of described area-of-interest.The difference of the vertical height finally calculating the center of described area-of-interest and the vertical height of the center of rotation of CT scan system prestored.
In practical operation, can by the processing mode of Iamge Segmentation, the body cavity (dark colored portion) of the centre of plain film image is split, edge extracting is carried out again at dark colored portion, obtain the edge of area-of-interest, then using the centroid calculation of the pixel between two edges out as the center of area-of-interest.Then the vertical dimension of the misalignment center of rotation of area-of-interest is calculated.
S602: according to described vertical drop, adjusts the scanning bed vertical height of described CT scan system, to eliminate the biased heart of pendulum.
In the present embodiment, when determine described by the biased heart of pendulum of scanning human body time, can to the scanning bed transmitting control commands of described CT scan system.Described scanning bed can according to described by the scanning region of interest centers of human body and the vertical drop lifting in vertical direction of the center of rotation of CT scan system or decline, the described region of interest centers by scanning human body is overlapped with the center of rotation of CT scan system, eliminates the biased heart of pendulum.
In the embodiment of the present invention, first, the vertical drop by the scanning region of interest centers of human body and the center of rotation of CT scan system is calculated.Secondly, according to described vertical drop, adjust the scanning bed vertical height of described CT scan system, to eliminate the biased heart of pendulum.The embodiment of the present invention, not overlapped with the center of rotation of CT scan system by the region of interest centers of scanning human body, adjusts scanning bed vertical height, eliminates the biased heart of pendulum, finally makes the quality of scanogram be improved.
In addition, when area-of-interest is heart or the heart near zone of human body, the embodiment of the present invention also can eliminate the biased heart of pendulum, improves temporal resolution, finally makes the scanogram Quality advance of heart.
With reference to Figure 11, what provide for the embodiment of the present invention a kind ofly eliminates the apparatus structure schematic diagram putting the biased heart, and described device can comprise:
Computing module 1101, for calculating the vertical drop by the scanning region of interest centers of human body and the center of rotation of CT scan system;
Adjusting module 1102, for according to described vertical drop, adjusts the scanning bed vertical height of described CT scan system, to eliminate the biased heart of pendulum.
Wherein, described computing module can comprise:
First scanning submodule, for when the described area-of-interest by scanning human body is the entire scope of people's body section, after being carried out the scanning of plain film lateral projection by people's body section of scanning human body, obtains the raw data of plain film of described people's body section;
First determines submodule, for according to the raw data of described plain film, determines the detector channel that the barycenter of described people's body section is corresponding;
First judges submodule, for judging whether the distance between the detector channel that the central passage of described detector is corresponding with described barycenter is greater than predetermined threshold value;
Second determines submodule, for when described first judges the result of submodule as being, determines that the barycenter of described people's body section departs from the deviation angle of described center of rotation;
First calculating sub module, for according to described deviation angle, calculates the barycenter of described people's body section and the vertical drop of described center of rotation.
In addition, described computing module can also comprise:
Second scanning submodule, for when the described area-of-interest by scanning human body is the entire scope of people's body section, after being carried out the scanning of plain film lateral projection by people's body section of scanning human body, obtains the plain film image of described people's body section;
3rd determines submodule, for according to described plain film image, determines described by the vertical height of the peak of people's body section of scanning human body;
Second calculating sub module, for according to the vertical height of peak of described people's body section and the vertical height of minimum point, calculate the vertical height at the center of described people's body section, the center of described people's body section is the mid point of the highs and lows of described people's body section, or is the centroid position of pixel between described peak and described minimum point;
3rd calculating sub module, for the vertical height that calculates the center of the described people's body section difference with the vertical height of the center of rotation of the CT scan system prestored.
Concrete, described computing module can comprise:
4th calculating sub module, for when the described area-of-interest by scanning human body is the subrange of people's body section, according to by the posting of scanning human body, calculates described by the vertical height at the center of the area-of-interest of scanning human body;
5th calculating sub module, for the vertical height that calculates the center of the described area-of-interest difference with the vertical height of the center of rotation of the CT scan system prestored.
In practical application, described computing module can comprise:
3rd scanning submodule, for when the described area-of-interest by scanning human body be heart or heart near zone time, to being scanned after people's body section of human body carries out the scanning of plain film lateral projection, obtain the plain film image of described people's body section;
Process submodule, for carrying out Iamge Segmentation process to described plain film image, obtains the image that described area-of-interest is corresponding;
6th calculating sub module, for calculating the vertical height of the barycenter of image corresponding to described area-of-interest, and is defined as the vertical height at the center of described area-of-interest by the vertical height of described barycenter;
7th calculating sub module, for the vertical height that calculates the center of the described area-of-interest difference with the vertical height of the center of rotation of the CT scan system prestored.
The embodiment of the present invention, not overlapped with the center of rotation of CT scan system by the region of interest centers of scanning human body, adjusts scanning bed vertical height, eliminates the biased heart of pendulum, finally makes the quality of scanogram be improved.In addition, when area-of-interest is heart or the heart near zone of human body, the embodiment of the present invention also can eliminate the biased heart of pendulum, improves temporal resolution, finally makes the scanogram Quality advance of heart.
For device embodiment, because it corresponds essentially to embodiment of the method, so relevant part illustrates see the part of embodiment of the method.Device embodiment described above is only schematic, the wherein said unit illustrated as separating component or can may not be and physically separates, parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed on multiple NE.Some or all of module wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.Those of ordinary skill in the art, when not paying creative work, are namely appreciated that and implement.
It should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
The elimination provided the embodiment of the present invention is above put biased heart method and apparatus and is described in detail, apply specific case herein to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. eliminate a method of putting the biased heart, it is characterized in that, described method comprises:
Calculate the vertical drop by the scanning region of interest centers of human body and the center of rotation of CT scan system;
According to described vertical drop, adjust the scanning bed vertical height of described CT scan system, to eliminate the biased heart of pendulum.
2. method according to claim 1, it is characterized in that, when the described area-of-interest by scanning human body is the entire scope of people's body section, described calculating is scanned the vertical drop of the center of rotation of the region of interest centers of human body and CT scan system, comprising:
After being carried out the scanning of plain film lateral projection by people's body section of scanning human body, obtain the raw data of plain film of described people's body section;
According to the raw data of described plain film, determine the detector channel that the barycenter of described people's body section is corresponding;
Judge whether the distance between the detector channel that the central passage of described detector is corresponding with described barycenter is greater than predetermined threshold value, if so, then determine that the barycenter of described people's body section departs from the channel number of described center of rotation;
According to described channel number, calculate the barycenter of described people's body section and the vertical drop of described center of rotation.
3. method according to claim 1, it is characterized in that, when the described area-of-interest by scanning human body is the entire scope of people's body section, described calculating is scanned the vertical drop of the center of rotation of the region of interest centers of human body and CT scan system, comprising:
After being carried out the scanning of plain film lateral projection by people's body section of scanning human body, obtain the plain film image of described people's body section;
According to described plain film image, determine described by the vertical height of the peak of people's body section of scanning human body;
According to the vertical height of peak and the vertical height of minimum point of described people's body section, calculate the vertical height at the center of described people's body section, the center of described people's body section is the mid point of the highs and lows of described people's body section, or is the centroid position of pixel between described peak and described minimum point;
The difference of the vertical height calculating the center of described people's body section and the vertical height of the center of rotation of CT scan system prestored.
4. method according to claim 1, it is characterized in that, when the described area-of-interest by scanning human body is the subrange of people's body section, described calculating is scanned the vertical drop of the center of rotation of the region of interest centers of human body and CT scan system, comprising:
According to by the posting of scanning human body, calculate described by the vertical height of the region of interest centers of scanning human body;
The difference of the vertical height calculating described region of interest centers and the vertical height of the center of rotation of CT scan system prestored.
5. method according to claim 1, it is characterized in that, when described by scanning human body area-of-interest be heart or heart near zone time, described calculating is scanned the vertical drop of the center of rotation of the region of interest centers of human body and CT scan system, comprising:
After being carried out the scanning of plain film lateral projection by people's body section of scanning human body, obtain the plain film image of described people's body section;
Iamge Segmentation process is carried out to described plain film image, obtains the image that described area-of-interest is corresponding;
Calculate the vertical height of the barycenter of image corresponding to described area-of-interest, and the vertical height of described barycenter is defined as the vertical height at the center of described area-of-interest;
The difference of the vertical height calculating the center of described area-of-interest and the vertical height of the center of rotation of CT scan system prestored.
6. eliminate the device putting the biased heart, it is characterized in that, described device comprises:
Computing module, for calculating the vertical drop by the scanning region of interest centers of human body and the center of rotation of CT scan system;
Adjusting module, for according to described vertical drop, adjusts the scanning bed vertical height of described CT scan system, to eliminate the biased heart of pendulum.
7. device according to claim 6, is characterized in that, described computing module comprises:
First scanning submodule, for when the described area-of-interest by scanning human body is the entire scope of people's body section, after being carried out the scanning of plain film lateral projection by people's body section of scanning human body, obtains the raw data of plain film of described people's body section;
First determines submodule, for according to the raw data of described plain film, determines the detector channel that the barycenter of described people's body section is corresponding;
First judges submodule, for judging whether the distance between the detector channel that the central passage of described detector is corresponding with described barycenter is greater than predetermined threshold value;
Second determines submodule, for when described first judges the result of submodule as being, determines that the barycenter of described people's body section departs from the deviation angle of described center of rotation;
First calculating sub module, for according to described deviation angle, calculates the barycenter of described people's body section and the vertical drop of described center of rotation.
8. device according to claim 6, is characterized in that, described computing module comprises:
Second scanning submodule, for when the described area-of-interest by scanning human body is the entire scope of people's body section, after being carried out the scanning of plain film lateral projection by people's body section of scanning human body, obtains the plain film image of described people's body section;
3rd determines submodule, for according to described plain film image, determines described by the vertical height of the peak of people's body section of scanning human body;
Second calculating sub module, for according to the vertical height of peak of described people's body section and the vertical height of minimum point, calculate the vertical height at the center of described people's body section, the center of described people's body section is the mid point of the highs and lows of described people's body section, or is the centroid position of pixel between described peak and described minimum point;
3rd calculating sub module, for the vertical height that calculates the center of the described people's body section difference with the vertical height of the center of rotation of the CT scan system prestored.
9. device according to claim 6, is characterized in that, described computing module comprises:
4th calculating sub module, for when the described area-of-interest by scanning human body is the subrange of people's body section, according to by the posting of scanning human body, calculates described by the vertical height of the region of interest centers of scanning human body;
5th calculating sub module, for the vertical height that the calculates described region of interest centers difference with the vertical height of the center of rotation of the CT scan system prestored.
10. device according to claim 6, is characterized in that, described computing module comprises:
3rd scanning submodule, for when the described area-of-interest by scanning human body be heart or heart near zone time, to being scanned after people's body section of human body carries out the scanning of plain film lateral projection, obtain the plain film image of described people's body section;
Process submodule, for carrying out Iamge Segmentation process to described plain film image, obtains the image that described area-of-interest is corresponding;
6th calculating sub module, for calculating the vertical height of the barycenter of image corresponding to described area-of-interest, and is defined as the vertical height at the center of described area-of-interest by the vertical height of described barycenter;
7th calculating sub module, for the vertical height that calculates the center of the described area-of-interest difference with the vertical height of the center of rotation of the CT scan system prestored.
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| CN104586421B (en) | 2017-08-25 |
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