CN101923607A - Blood vessel computer aided iconography evaluating system - Google Patents
Blood vessel computer aided iconography evaluating system Download PDFInfo
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- CN101923607A CN101923607A CN2010102693980A CN201010269398A CN101923607A CN 101923607 A CN101923607 A CN 101923607A CN 2010102693980 A CN2010102693980 A CN 2010102693980A CN 201010269398 A CN201010269398 A CN 201010269398A CN 101923607 A CN101923607 A CN 101923607A
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Abstract
The invention relates to a blood vessel computer aided iconography evaluating system. The system comprises the following contents: (A) transmission of CTA (Computed Tomography Angiography) from a CT (Computed Tomography) working station to a PC (Personal Computer), wherein a transmission way comprises network card connection, CD burning and CT film scanning; (B) CTA three-dimensional reconstruction, wherein a three-dimensional reconstruction method comprises shaded surface display (SSD), maximum intensity projection (MIP) and multiplane reformation (MPR), obtains various real and clear three-dimensional models and images and can be used for observing a blood vessel three-dimensional space structure anytime and anywhere and lay the foundation for the three-dimensional measurement of various blood vessel geometric parameters; (C) blood vessel structure three-dimensional measurement; and (D) aneurysm endovascular graft exclusion virtual graft. The invention provides the computer aided iconography evaluating system which is suitable for people to use at random and is more accurate. In addition, the invention plays a role in blood vessel surgical scientific research, teaching, surgery training, and the like. The system realized by the invention is stable and reliable and is suitable for being popularized and used in blood vessel surgery centers of various large, medium and small hospitals.
Description
Technical field
The present invention relates to a kind of blood vessel computer aided iconography evaluating system.
Background technology
In recent years, be that the endoluminal vascular operation of representative has obtained development rapidly with the endovascular graft, substitute many traditional vascular surgeries gradually.The method and the performing step of intracavity operation and traditional operation are completely different, and the degree of dependence that they learn assessment to blood vessel image is also different.Traditional operation relies on eye, hand three-dimensional system of coordinate to carry out under direct-view, the doctor can and accurately measure pathology section blood vessel from the outside and inboard Direct observation, and can carry out cutting arbitrarily to surgical materials such as artificial blood vessels as required, to adapt to the needs of different anatomical structures.So traditional operation obtains accurate vascular morphology before for art and learns data and do not have too high requirement.Intracavity operation is then different.At first, the doctor needs to be undertaken by the X line monitor screen on plane to the observation and the operation of operating field, promptly relies on eye, apparatus two-dimensional coordinate system to carry out, and therefore, it is very important that the doctor fully understands pathology section blood vessel 3 D anatomical form.Secondly, intracavity operation can only carry out the measurement of various parameters by imaging examination, and requires very high to the accuracy of parameter measurements such as length of vessel, bore.Once more, the specification of the various grafts that intracavity operation uses is constant, and the extent of amendment that is allowed to after entering in the body is very little, therefore, must just choose the graft of appropriate size before operation.But the iconography assessment of assessment accuracy deficiency may lead to errors before mistake or the inaccurate art operation decision-making, surgery planning and graft are selected, and then directly cause the failure or the severe complication of intracavity operation, make patient be forced to the transfer traditional operation even face life danger.
CT angiogram (computed tomographic angiography, CTA) and three-dimensional reconstruction has that safety does not have wound, sweep velocity is fast, resolving power is high, can be advantages such as various 3-D views with tomographic image reconstructing, can make the doctor fully understand blood vessel solid space configuration and measure various parameters, be to use the widest blood vessel image to learn assessment technology at present.For vascular operation provides powerful, visual and accurate imaging examination means.But the post processing of image software of CT workstation can't obtain and use for the vascular surgery doctor, present situation is to carry out data scanning and three-dimensional reconstruction by the radiologist, and after finishing basic measurement evaluation work, transfer CT film and measurement data to the vascular surgery doctor, finally finish iconography assessment and graft planning by it according to resulting data again.Although comprise the 3D image of some angles on the CT film that the vascular surgery doctor obtains, but this only is complanation and the 3D image that solidified, the vascular surgery doctor is rotated on graphoscope as required at any angle and observe, and in intracavity operation, also can't obtain the guidance of 3D model, influence its judgement and decision-making to situation in the art.Therefore, present dept. of radiology has lost the quantity of information of CTA to the transfer pattern of vascular surgery on sizable degree, has influenced the effect of assessing before the art.The more important thing is, vascular surgery doctor and radiologist's professional visual angle is not quite similar, they difference may occur to the selection of measuring position, radial line, angle, and the CT workstation is to the science and the accuracy wretched insufficiency of measuring methods such as length of vessel, bore at present.Such as, its measurement to length of vessel is by marking some continuous straight lines along the blood vessel trend in blood vessel image, utilizing the air line distance survey instrument to measure their total length again, as the length of blood vessel.Because the traveling of blood vessel is usually and non-rectilinear, but crooked or become the angle to reverse, therefore, more than the measuring method of curve linearize very out of true.For another example, its measurement to blood vessel diameter is by artificial selection and the perpendicular plane of flow axis, also claim the canopy tangent plane, on this plane, measure diameter, but select at oval or difform canopy tangent plane to represent the measurement radial line of real diameter still very difficult, exist bigger accidental error, add that its canopy tangent plane is artificial selected, perpendicularity can not guarantee.More than the existence of these situations and problem, seriously restricted the iconography assessment effect of CTA.
Summary of the invention
Based on the problems referred to above, the present invention's research has also been developed blood vessel computer aided iconography evaluating system, it is on the basis of CT workstation DICOM tomoscan data, utilize multi-door subject technologies such as vascular surgery, computer vision, Digital Image Processing and three-dimensional reconstruction, Computer Numerical Simulation, biomechanics, a kind of that use at any time, the accurate more computer aided iconography evaluating system of developing.In addition, the present invention also is expected to play a role at aspects such as vascular surgery scientific research, teaching, operation trainings.The system stability that the present invention realizes is reliable, and promote the use of at the vascular surgery center that is adapted at large, medium and small various hospital.
The present invention adopts following technical scheme to achieve these goals: a kind of blood vessel computer aided iconography evaluating system, and the native system content comprises:
(A) transmission of CTA tomoscan image from the CT workstation to PC, transmission manner comprise that network interface card connects, imprints CDs, the CT film scanning;
(B) CTA tomoscan image three-dimensional reconstruction, the method of three-dimensional reconstruction comprises shaded surface explicit representation (SSD), maximum intensity projection method (MIP), multiplanar reconstruction method (MPR), obtain various truly three-dimensional model and images clearly, can observe the blood vessel three-D space structure anywhere or anytime, also lay a good foundation for the three-dimensional measurement of various blood vessel geometric parameters;
(C) blood vessel structure three-dimensional measurement;
(D) the virtual graft of aneurysm endovascular graft.
The method of measuring length of vessel in above-mentioned (C) blood vessel structure three-dimensional measurement is: with the line frame graph of blood vessel SSD image, blood vessel starting point to each transversal section central point between the end point is connected with curve, with this length of a curve as measuring object, obtain length of vessel apart from sum by calculating between the pixel on the junction curve, thereby can measure length of vessel more accurately:
(x, y, z are the coordinate of transversal section central point).
The method of measuring vessel diameter in above-mentioned (C) blood vessel structure three-dimensional measurement is: calculate vessel diameter by measuring this tangent plane blood vessel girth, at first obtain real MPR canopy tangent plane automatically by selecting normal equation; S
1And S
2Be two adjacent transversal section of blood vessel, its mid point is respectively C
1(x
1, y
1, z
1) and C
2(x
2, y
2, z
2), because S
1With S
2Spacing very little, C
1With C
2Between line C
1C
2Can be considered as the normal n of canopy tangent plane S approx, and { c}, the intersection point of normal and S are C for a, b, then, just can list the equation of canopy tangent plane S according to selecting normal equation, as the platform of diameter measurement: a (x x can to obtain the direction of normal
1) b (y y
1) c (z z
1) 0; After grafts such as support are inserted blood vessel, ideally should fit tightly with vascular wall, blood vessel should be expanded to positive circular by support.Because the blood vessel girth of different shape can both accurately be measured by computing machine, so native system calculates diameter d after blood vessel becomes circle by the blood vessel perimeter p: d p/＜(π is a circular constant).
The virtual graft of above-mentioned (D) aneurysm endovascular graft is by image segmentation and rebuilds artery and the SSD model in knurl chamber, is converted into line frame graph again; Mid point by knurl chamber outline line on each transversal section forms a line, and as knurl chamber geometric center lines, indentation carries out median filter smoothness of image to it again and handles, and obtains the center line of a smoother; On this basis, by the simulation elastic force of intra-graft and outside knurl body constraining force, the direction of travel of prediction graft in the knurl chamber to graft; Below minimum arteria renalis opening, determine the position and the size on the initial plane of graft again according to the knurl neck diameter of measuring, and along the direction of travel of predicting growth downwards gradually, until far-end knurl mouth, obtain the line frame graph of virtual graft, at last according to the length of the central line measurement graft of graft.
Native system also comprises interactively Chinese graphical interfaces, can stable operation in PC Windows operating system, have complete data input function, post processing of image function, output function and user's operating function as a result.
Native system comprises various blood vessel three-dimensional measurement softwares, and more science, more accurate measurement data are provided.Except that survey instruments such as common distance, girth, angle, area, volume, also complications or crooked form characteristics are often arranged at the blood vessel traveling, invented a kind of length of vessel special measurement instrument, and the technology of having invented a kind of automatic searching blood vessel vertical cross-section, be used for more accurate measurement vessel diameter.In addition, native system also often is the characteristics that irregular off-centre is expanded at aneurysm, has invented a kind of " virtual graft " technology, with traveling and the length of prediction aneurysm endovascular graft graft.
The present invention compared with prior art has following technical characterstic:
Vascular operation computer aided iconography evaluating system of the present invention is easily in the DICOM tomoscan data importing system with the CT workstation; The three-dimensional measurement of system, particularly automatic canopy tangent plane technology and the length and the automatically measuring diameter method that meet the vascular anatomy characteristics can be measured blood vessel parameter more accurately; The virtual graft technology of system, can be endovascular graft provides and has more iconography assessment before the prospective art.
The present invention is that a kind of suitable people use at any time, accurate more computer aided iconography evaluating system.In addition, the present invention plays a role at aspects such as vascular surgery scientific research, teaching, operation trainings.The system stability that the present invention realizes is reliable, and promote the use of at the vascular surgery center that is adapted at large, medium and small various hospital.
Description of drawings
Fig. 1 is the three-dimensional reconstruction process flow diagram.
Embodiment
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
Native system has been developed 3 kinds of data entry devices such as network interface card, CD, CT film, can by these modes the original CT A tomoscan data in the CT workstation be imported native system easily.
Fig. 1 is a CT faultage image three-dimensional reconstruction software flow pattern, on the basis that original faultage image pre-service and various institutional framework are cut apart, realized the medical image three-dimensional rebuilding method of shaded surface explicit representation, maximum intensity projection method, multiplanar reconstruction method three kinds of widespread uses, and by methods such as positive parallel projection, elimination of hidden, illumination model and coordinate transforms, functions such as the two dimension demonstration of realization three-dimensional model and translation, convergent-divergent, rotation, dynamic demonstration.
In routine measurements such as the basic enterprising row distance of 3-D view, girth, angle, area, volumes, and the length of vessel at the vascular morphology characteristics of native system invention measures and the blood vessel diameter measurement, for operation provides more science, more accurate measurement data.Wherein, in blood vessel diameter is measured, system applies the automatic canopy cross section technology among the present invention.
For the aneurysm endovascular graft, also to the actual direction of travel of graft in the scientific forecasting aneurysm, select the optimum length of graft more accurately by the virtual graft technology of aneurysm endovascular graft of native system.
Claims (4)
1. blood vessel computer aided iconography evaluating system is characterized in that the native system content comprises:
(A) transmission of CTA tomoscan image from the CT workstation to PC, transmission manner comprise that network interface card connects, imprints CDs, the CT film scanning;
(B) CTA tomoscan image three-dimensional reconstruction, the method of three-dimensional reconstruction comprises shaded surface explicit representation (SSD), maximum intensity projection method (MIP), multiplanar reconstruction method (MPR), obtain various truly three-dimensional model and images clearly, can observe the blood vessel three-D space structure anywhere or anytime, also lay a good foundation for the three-dimensional measurement of various blood vessel geometric parameters;
(C) blood vessel structure three-dimensional measurement;
(D) the virtual graft of aneurysm endovascular graft.
2. blood vessel computer aided iconography evaluating system according to claim 1, it is characterized in that: the method for measuring length of vessel in above-mentioned (C) blood vessel structure three-dimensional measurement is: with the line frame graph of blood vessel SSD image, blood vessel starting point to each transversal section central point between the end point is connected with curve, with this length of a curve as measuring object, obtain length of vessel apart from sum by calculating between the pixel on the junction curve, thereby can measure length of vessel more accurately:
(x, y, z are the coordinate of transversal section central point).
3. blood vessel computer aided iconography evaluating system according to claim 1, it is characterized in that: the method for measuring vessel diameter in above-mentioned (C) blood vessel structure three-dimensional measurement is: calculate vessel diameter by measuring this tangent plane blood vessel girth, at first obtain real MPR canopy tangent plane automatically by selecting normal equation; S
1And S
2Be two adjacent transversal section of blood vessel, its mid point is respectively C
1(x
1, y
1, z
1) and C
2(x
2, y
2, z
2), because S
1With S
2Spacing very little, C
1With C
2Between line C
1C
2Can be considered as the normal n of canopy tangent plane S approx, and { c}, the intersection point of normal and S are C for a, b, then, just can list the equation of canopy tangent plane S according to selecting normal equation, as the platform of diameter measurement: a (x x can to obtain the direction of normal
1) b (y y
1) c (z z
1) 0; After grafts such as support are inserted blood vessel, ideally should fit tightly with vascular wall, blood vessel should be expanded to positive circular by support; Because the blood vessel girth of different shape can both accurately be measured by computing machine, so native system calculates diameter d after blood vessel becomes circle by the blood vessel perimeter p: d p/＜(π is a circular constant).
4. blood vessel computer aided iconography evaluating system according to claim 1 is characterized in that: the virtual graft of above-mentioned (D) aneurysm endovascular graft is by image segmentation and rebuilds artery and the SSD model in knurl chamber, is converted into line frame graph again; Mid point by knurl chamber outline line on each transversal section forms a line, and as knurl chamber geometric center lines, indentation carries out median filter smoothness of image to it again and handles, and obtains the center line of a smoother; On this basis, by the simulation elastic force of intra-graft and outside knurl body constraining force, the direction of travel of prediction graft in the knurl chamber to graft; Below minimum arteria renalis opening, determine the position and the size on the initial plane of graft again according to the knurl neck diameter of measuring, and along the direction of travel of predicting growth downwards gradually, until far-end knurl mouth, obtain the line frame graph of virtual graft, at last according to the length of the central line measurement graft of graft.
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| CN102360495A (en) * | 2011-10-19 | 2012-02-22 | 西安电子科技大学 | Pulmonary nodule segmentation method based on average intensity projection and translation gaussian model |
| CN103218797A (en) * | 2012-01-19 | 2013-07-24 | 中国科学院上海生命科学研究院 | Method and system for processing and analyzing blood vessel image |
| CN103854286A (en) * | 2014-03-05 | 2014-06-11 | 东南大学 | Renal artery blood-supply area segmenting method based on CT contrastographic picture |
| CN105596082A (en) * | 2016-01-29 | 2016-05-25 | 四川大学 | Abdominal aorta aneurysm growth process modeling method |
| CN105997244A (en) * | 2016-04-29 | 2016-10-12 | 北京百特康科技有限公司 | Method and system for digital surgical operation design |
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| CN102360495A (en) * | 2011-10-19 | 2012-02-22 | 西安电子科技大学 | Pulmonary nodule segmentation method based on average intensity projection and translation gaussian model |
| CN103218797A (en) * | 2012-01-19 | 2013-07-24 | 中国科学院上海生命科学研究院 | Method and system for processing and analyzing blood vessel image |
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| CN109345585A (en) * | 2018-10-26 | 2019-02-15 | 强联智创（北京）科技有限公司 | A kind of measurement method and system of the Morphologic Parameters of intracranial aneurysm image |
| CN109816727A (en) * | 2019-01-29 | 2019-05-28 | 江苏医像信息技术有限公司 | The target identification method of three-dimensional atlas |
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| CN110992380A (en) * | 2019-12-10 | 2020-04-10 | 昆明理工大学 | Method for extracting internal pores of lotus-shaped porous metal and measuring geometric parameters |
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