CN106683176A - Visceral organ three-dimensional model construction method and device - Google Patents
Visceral organ three-dimensional model construction method and device Download PDFInfo
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- CN106683176A CN106683176A CN201611254955.5A CN201611254955A CN106683176A CN 106683176 A CN106683176 A CN 106683176A CN 201611254955 A CN201611254955 A CN 201611254955A CN 106683176 A CN106683176 A CN 106683176A
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- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
Abstract
The present invention discloses a visceral organ three-dimensional model construction method and device. The method comprises: obtaining a three-dimensional image obtained through scanning, performing slicing of the three-dimensional image, and obtaining a slicing image; drawing the outline of the contour line of the slicing according to the slicing image, and performing spline curve fitting of the contour line; unifying the u-direction feature node vectors of the spline curve, and constructing the spline surface; and calculating and obtaining the triangular mesh vertex of the surface model, and generating a triangular mesh surface. The visceral organ three-dimensional model construction method and device can reduce the errors while reducing the number of operation, edit the control points of the spline surface, flexibly control the shape of the reconstitution visceral organ model and effectively improve the precision of the reconstitution model.
Description
Technical field
The present invention relates to technical field of medical image processing, more particularly to a kind of internal organs 3 D model construction method and dress
Put.
Background technology
Virtual internal organs computer-assisted analyses (Virtual Organ Computer Aided Analysis, Vocal) skill
Art provides effective means to ultrasonic diagnosises, and the technology cardinal principle is to be delineated based on the internal organs profile of ultrasonoscopy, with grid
The stereomodel of surface reconstruction internal organs, provides more clinical diagnosis informations for internal organs volumetric measurement, visualization.Range of application bag
Include：Pregnant bursa measurement, tumor evaluation, gallbladder function assessment, prostate volumetric measurement, fetal development detection etc..The technology again
Renaturation, concordance are better than two-dimensional ultrasound, are used widely.The three-dimensional internal organs reconstruction model precision wherein sketched the contours based on profile,
Be completely dependent on subjectivity sketches the contours contour line profile and contour line quantity, and contour line quantity is more, and reconstruction model precision is higher, but phase
The contour line answered sketches the contours increased frequency, and workload is increased exponentially.And cannot be to the 3 d ultrasonography of model and internal organs after generation
As comparing, the real-time edition of threedimensional model is not supported, the reconstruction precision of virtual internal organs is improved without effective method, accurately
Diagnostic message is provided.
CN 105761304A disclose a kind of three-dimensional internal organs model construction method and device, its internal organs model structure for proposing
Construction method, efficiently solves not improving the method that reconstruction accuracy is improved on the premise of number of times of sketching the contours, but the method also exist with
Lower shortcoming：1 needs extra calculating contour line point method arrow, introduces trueness error.2. computationally intensive .3 bases of grid reconstruction algorithm
In editor's interaction underaction of triangle gridding.
The content of the invention
A kind of internal organs 3 D model construction method and device are embodiments provided, to solve to exist in prior art
Precision is low and the big problem of operand.
In a first aspect, a kind of internal organs 3 D model construction method is embodiments provided, including：
The 3-D view that scanning is obtained is obtained, the 3-D view is cut into slices, obtain sectioning image；
The contour line of the section is sketched the contours according to the sectioning image, and spline curve fitting is carried out to the contour line；
The u direction characteristic node vector of the unification SPL, and construct spline surface model；
The triangle gridding summit of the surface model is calculated, triangle mesh curved surface is generated.
Further, it is described spline curve fitting is carried out to the contour line after, the u side of the unification SPL
To before characteristic node vector, including：
The curvature of the head and the tail end points of the SPL is adjusted, so that the SPL continual curvature.
Further, the u direction characteristic node vector of the unification SPL, including：
Obtain the control point of SPL；
Multiple single node insertion is carried out to the control point, the unified knot vector of curve is calculated.
Further, the constructing curve model, including：
SPL v direction character knot vectors are calculated using averaging method；
Spline surface model is constructed according to the SPL u direction characteristic node vector v direction character knot vector.
Further, after construction spline surface, also wrap before being calculated the triangle gridding summit of the surface model
Include：
Also include：
The operation at adjustment control point is received, and according to the operation and control point topological relation adjustment control point；
Accordingly, the calculating triangle gridding summit, generates triangle mesh curved surface, including：
Triangle gridding summit is calculated according to the control point after adjustment
Further, methods described also includes：
According to the triangle gridding and topological relation, section area is calculated,
The virtual internal organs volume of calculating is overlapped to the section.
Second aspect, the embodiment of the present invention additionally provide a kind of internal organs threedimensional model construction device, including：Sectioning image is obtained
Delivery block, for obtaining the 3-D view that scanning is obtained, cuts into slices to the 3-D view, obtains sectioning image；
Fitting module, for the contour line of the section is sketched the contours according to the sectioning image, and is carried out to the contour line
Spline curve fitting；
Constructing module, for unifying the u direction characteristic node vector of the SPL, and constructs spline surface；
Generation module, for being calculated the triangle gridding summit of the surface model, generates triangle mesh curved surface.
Further, described device also includes：
Adjusting module, for adjusting the curvature of the head and the tail end points of the SPL, so that the SPL curvature
Continuously.
Further, the constructing module includes：
Control point acquiring unit, for obtaining the control point of SPL；
Computing unit, for multiple single node insertion is carried out to the control point, is calculated the unified node arrow of curve
Amount.
Further, the constructing module is used for：
SPL v direction character knot vectors are calculated using averaging method；
Spline surface is constructed according to the SPL u direction characteristic node vector v direction character knot vector.
Further, described device also includes：
Adjusting module, for receiving the operation at adjustment control point, and according to the operation and the adjustment of control point topological relation
Control point；
Accordingly, the computing module is used for：
Triangle gridding summit is calculated according to the control point after adjustment.
Further, described device also includes：
Area calculation module, for according to the triangle gridding and topological relation, calculating section area,
Volume calculations module, for being overlapped the virtual internal organs volume of calculating to the section.
Internal organs 3 D model construction method provided in an embodiment of the present invention and device, are fitted according to the section of 3-D view
Spline curve construction spline surface, while operand is reduced, reduces error；And can be given birth to according to the control point of spline surface
Into triangle mesh curved surface, the operand of internal organs model reconstruction is effectively reduced.
Description of the drawings
By reading the detailed description made to non-limiting example made with reference to the following drawings, other of the invention
Feature, objects and advantages will become more apparent upon：
Fig. 1 is the schematic flow sheet of the internal organs 3 D model construction method that the embodiment of the present invention one is provided；
Fig. 2 is the schematic flow sheet of the internal organs 3 D model construction method that the embodiment of the present invention two is provided；
Fig. 3 is the schematic flow sheet of the internal organs 3 D model construction method that the embodiment of the present invention three is provided；
Fig. 4 is the schematic flow sheet of the internal organs 3 D model construction method that the embodiment of the present invention four is provided；
Fig. 5 is the structural representation of the internal organs threedimensional model construction device that the embodiment of the present invention five is provided.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention, rather than limitation of the invention.It also should be noted that, in order to just
Part related to the present invention rather than full content are illustrate only in description, accompanying drawing.
Embodiment one
Fig. 1 is the schematic flow sheet of the internal organs 3 D model construction method that the embodiment of the present invention one is provided, and the present embodiment can
Situation suitable for internal organs threedimensional model is built using ultrasonic scanning result, the method can be built by internal organs threedimensional model and be filled
Put to perform, the device can be realized by software/hardware mode, and can be integrated in supersonic imaging apparatus.
Referring to Fig. 1, the internal organs 3 D model construction method, including：
S110, obtains the 3-D view that scanning is obtained, the 3-D view is cut into slices, and obtains sectioning image.
Ultra sonic imaging is the acoustic imaging using ultrasound wave.At present, all three-dimensional imagings are shown in the way of plane shows
It is ready-made with relief display mode.An axonometric chart is reconstructed into generally using the scanning two dimensional image of multiple diverse locations
Picture.For example：The border of image is detected using coordinate displacement method, then these images are overlapped, generate scanning graphics
Picture.In the present embodiment, first two-dimensional image quality can be adjusted to most preferably, into three-D ultrasonic pattern, selects radial section mould
Formula and/or rotation slicing mode, and slicing parameter is set.The radial section pattern can be right according to the radial direction of 3-D view
3-D view is cut into slices；The rotation slicing mode can select any one direction as section axially to graphics
As being cut into slices.The slicing parameter includes the thickness cut into slices.The angle of section is more, the internal organs model accuracy for constructing accordingly
It is higher, but amount of calculation is also bigger.Accordingly, it would be desirable to choose pattern according to the actual requirements.Accordingly, the thickness of section also with construction
Internal organs model accuracy is related.The thickness cut into slices is less, and the internal organs model accuracy for constructing accordingly is higher, but amount of calculation is also got over
Greatly.It is also required to set suitable slicing parameter according to required precision.According to the slicing mode and slicing parameter of setting to described three
Dimension image is cut into slices, and obtains sectioning image.
S120, sketches the contours the contour line of the section according to the sectioning image, and carries out SPL to the contour line
Fitting.
It is as 3-D view is gray level image, exemplary, rim detection, root can be carried out using canny Operator Methods
The contour line of section is sketched the contours of according to the result of rim detection.SPL is that, through a series of smooth curve of set points, have
Continuously, the characteristics of Curvature varying is uniform.Can be used in describing free curve and curved surface, but also provide that include can accurate table
Up to conic section curved surface interior various solids uniform expression.Exemplary, can choose suitable according to precision is built
Control point number, chooses the point of the quantity for meeting control point standard from contour line as control point, multiple according to what is selected
Control point is fitted SPL.Exemplary, SPL can be fitted using method of least square.Method of least square is (also known as most
Square method) it is a kind of mathematical optimization techniques.It finds the optimal function matching of data by the quadratic sum for minimizing error.Profit
Unknown data can be easily tried to achieve with method of least square, and cause error between data that these try to achieve and real data
Quadratic sum is minimum.Can be used for curve matching.For example：Can be fitted in the following way：
Wherein, C (u) is SPL equation, knot vector U={ u0,u1,u2,..un+p+1, u'kFor the corresponding vector in control point, Pi
It is SPL control point to be asked, QkFor contour line point, method of least square target is to seek Pi, make f minimum.
S130, the u direction characteristic node vector of the unification SPL, and construct spline surface.
In the present embodiment, spline surface model is constructed using skinning algorithm.As spline surface may be regarded as a plurality of batten
The combination of curve.These SPLs need curve consistent.In the present embodiment, by way of node insertion, make batten bent
Line knot vector is unified.Obtain the control point of SPL；Specifically, multiple single node can be carried out to insert to the control point
Enter, be calculated the unified knot vector of curve.Exemplary, node insertion can be carried out in the following way：
Wherein, knot vector U={ u0,u1,u2,..un+p+1, ui<u≤ui+1, (k-p+1, k), k is the node of insertion to i ∈
U places SPL knot vector position, PiTo insert the front control point of node, QiTo insert control point after node.Complete batten
The u direction characteristic node vector of curve after reunification, needs to choose v directioin parameters.Can be chosen for what respective cross-section curve was fitted
The functional value of contour.Exemplary, can be calculated using averaging method：Its
In, diRepresent P in SPLi,k Pi,k-1Total distance, v directions knot vector is calculated according to characteristic node vectormeter.According to u
Direction character knot vector and v direction characters knot vector can construct spline surface.
S140, is calculated the triangle gridding summit of the surface model, generates triangle mesh curved surface.
Exemplary, can be carried out according to the u direction characteristic node vector v direction character knot vector of above-mentioned spline surface
Parameter model, is calculated the triangle gridding summit of the surface model, and is spliced into triangle gridding.Specifically, can be using such as
Under type is spliced：
The present embodiment is reducing operand by the spline curve construction spline surface of the section fitting according to 3-D view
While, reduce error；And triangle mesh curved surface can be generated according to the control point of spline surface, effectively reduce internal organs model
The operand of reconstruct.
Embodiment two
Fig. 2 is the schematic flow sheet of the internal organs 3 D model construction method that the embodiment of the present invention two is provided.The present embodiment with
Be optimized based on above-described embodiment, in the present embodiment, it is described spline curve fitting is carried out to the contour line after,
Increase following steps before the u direction characteristic node vector of the unification SPL：According to the control point of the SPL
The curvature of end points is adjusted using method of least square.
Referring to Fig. 2, the internal organs 3 D model construction method, including：
S210, obtains the 3-D view that scanning is obtained, the 3-D view is cut into slices, and obtains sectioning image.
S220, sketches the contours the contour line of the section according to the sectioning image, and carries out SPL to the contour line
Fitting.
S230, adjusts the curvature of the head and the tail end points of the SPL, so that the SPL continual curvature.
Exemplary, the curvature of the starting endpoint of matched curve can be determined according to above-mentioned matched curve, and will be fitting bent
The curvature of the end caps of line is adjusted to consistent with the curvature of the starting endpoint.By the way, can adjust bent at end points
Line leads arrow so that curve continual curvature at the matched curve closure.
S240, the u direction characteristic node vector of the unification SPL, and construct spline surface.
S250, is calculated the triangle gridding summit of the surface model, generates triangle mesh curved surface.
The present embodiment is by increasing following steps：The curvature of the head and the tail end points of the SPL is adjusted, so that described
SPL continual curvature., so that continual curvature at head and the tail end points.The SPL after process can be made to meet the bar of closure
Part, it is to avoid the SPL for fitting occur cannot be closed, affects to build the situation of threedimensional model.
Embodiment three
Fig. 3 is the schematic flow sheet of the internal organs 3 D model construction method that the embodiment of the present invention three is provided.The present embodiment with
It is optimized based on above-described embodiment, in the present embodiment, methods described also comprises the steps：Receive adjustment control point
Operation, and according to the operation and control point topological relation adjustment control point；Accordingly, by the calculating triangle gridding summit,
Triangle mesh curved surface is generated, is specifically optimized for：Triangle gridding summit is calculated according to the control point after adjustment.
Referring to Fig. 3, the internal organs 3 D model construction method, including：
S310, obtains the 3-D view that scanning is obtained, the 3-D view is cut into slices, and obtains sectioning image.
S320, sketches the contours the contour line of the section according to the sectioning image, and carries out SPL to the contour line
Fitting.
S330, the u direction characteristic node vector of the unification SPL, and construct spline surface.
S340, receives the operation at adjustment control point, and according to the operation and control point topological relation adjustment control point.
During spline-fit is carried out, due to reasons such as picture noise, slice thicknesses, fitting may be produced and missed
Difference.Generally, registration can be carried out using by the target slice picture and the three-dimensional internal organs model section, handss is passed through by user
Dynamic operation adjustment control point, so that three-dimensional internal organs model section is more close to target slice picture.Receive user is adjusted manually
The operation at whole control point, determines the particular location at new control point according to the operation of user, and according to topological relation adjust with it is new
Control point relevant control point.The topological relation may refer to the mutual pass between each spatial data of topological geometry principle
System.So that adjustment after control point and exist therewith topological relation control point composition figure closer in actual slice
Figure.
S350, is calculated the triangle gridding summit of the surface model according to the control point after adjustment, generates the triangulation network
Lattice curved surface.
The triangle gridding summit of the surface model is calculated according to the control point after adjustment, so that the grid for generating is bent
Face is closer in internal organs exact shape.
The present embodiment is by increasing following steps：The operation at adjustment control point is received, and according to the operation and control point
Topological relation adjusts control point；Accordingly, by the calculating triangle gridding summit, specifically it is optimized for：According to the control after adjustment
Point calculates triangle gridding summit.There is provided interactive mode to be adjusted control point for user, change spline surface shape, Neng Gouyou
Effect improves reconstruction model precision.
Example IV
Fig. 4 is the schematic flow sheet of the internal organs 3 D model construction method that the embodiment of the present invention four is provided.The present embodiment with
It is optimized based on above-described embodiment, in the present embodiment, methods described also comprises the steps：According to the triangle gridding
And topological relation, section area is calculated, the virtual internal organs volume of calculating is overlapped to the section.
Referring to Fig. 4, the internal organs 3 D model construction method, including：
S410, obtains the 3-D view that scanning is obtained, the 3-D view is cut into slices, and obtains sectioning image.
S420, sketches the contours the contour line of the section according to the sectioning image, and carries out SPL to the contour line
Fitting.
S430, the u direction characteristic node vector of the unification SPL, and construct spline surface.
S440, is calculated the triangle gridding summit of the surface model, generates triangle mesh curved surface.
S450, according to the triangle gridding and topological relation, calculates section area.
Exemplary, section can be divided into by multiple little line segments according to the control point of triangle gridding and topological relation, and
Section area is calculated according to little line segment.
S460, is overlapped the virtual internal organs volume of calculating to the section.
The internal organs threedimensional model of virtual internal organs and structure, internal organs threedimensional model may be regarded as the superposition of multiple sections, therefore can
With the virtual internal organs volume of superposition calculation for carrying out the multiple section areas for calculating.Exemplary, can count in the following way
Calculate virtual internal organs volume：
The present embodiment is by increasing following steps：According to the triangle gridding and topological relation, section area is calculated, to institute
State section and be overlapped the virtual internal organs volume of calculating.Internal organs volume can be calculated according to the threedimensional model for building, can be had
Effect improves counting accuracy, provides accurate data for later stage diagnosis.
Embodiment five
Fig. 5 is the structural representation of the internal organs threedimensional model construction device that the embodiment of the present invention five is provided.As shown in figure 5,
The internal organs threedimensional model construction device includes：
Sectioning image acquisition module 510, for obtaining the 3-D view that scanning is obtained, cuts to the 3-D view
Piece, obtains sectioning image；
Fitting module 520, for the contour line of the section is sketched the contours according to the sectioning image, and enters to the contour line
Row spline curve fitting；
Constructing module 530, for unifying the u direction characteristic node vector of the SPL, and constructs spline surface；
Generation module 540, for being calculated the triangle gridding summit of the surface model, generates triangle mesh curved surface.
The internal organs threedimensional model construction device that the present embodiment is provided, according to the SPL structure of the section fitting of 3-D view
Spline surface is made, while operand is reduced, error is reduced；And triangle gridding can be generated according to the control point of spline surface
Curved surface, effectively reduces the operand of internal organs model reconstruction.
On the basis of the various embodiments described above, described device also includes：
Adjusting module, for adjusting the curvature of the head and the tail end points of the SPL, so that the SPL curvature
Continuously..
On the basis of the various embodiments described above, the constructing module includes：
Control point acquiring unit, for obtaining the control point of SPL；
Computing unit, for multiple single node insertion is carried out to the control point, is calculated the unified node arrow of curve
Amount.
On the basis of the various embodiments described above, the constructing module is used for：
SPL v direction character knot vectors are calculated using averaging method；
Spline surface is constructed according to the SPL u direction characteristic node vector v direction character knot vector.
On the basis of the various embodiments described above, described device also includes：
Adjusting module, for receiving the operation at adjustment control point, and according to the operation and the adjustment of control point topological relation
Control point；
On the basis of the various embodiments described above, the computing module is used for：
Triangle gridding summit is calculated according to the control point after adjustment.
On the basis of the various embodiments described above, described device also includes：
Area calculation module, for according to the triangle gridding and topological relation, calculating section area,
Volume calculations module, for being overlapped the virtual internal organs volume of calculating to the section.
Above-mentioned internal organs threedimensional model construction device can perform the internal organs threedimensional model structure provided by any embodiment of the present invention
Construction method, possesses the corresponding functional module of execution method and beneficial effect.
Obviously, it will be understood by those skilled in the art that each module of the above-mentioned present invention or each operation can be by as above
Described terminal unit is implemented.Alternatively, the embodiment of the present invention can be realized with the executable program of computer installation, so as to
Can be stored in storage device by processor performing, described program can be stored in a kind of computer-readable and deposit
In storage media, storage medium mentioned above can be read only memory, disk or CD etc.；Or they are fabricated to respectively
Each integrated circuit modules, or the multiple modules in them or operation are fabricated to single integrated circuit module to realize.This
Sample, the present invention are not restricted to the combination of any specific hardware and software.
Note, above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art various obvious changes,
Readjust and substitute without departing from protection scope of the present invention.Therefore, although the present invention is carried out by above example
It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also
More other Equivalent embodiments can be included, and the scope of the present invention is determined by scope of the appended claims.
Claims (12)
1. a kind of internal organs 3 D model construction method, it is characterised in that include：
The 3-D view that scanning is obtained is obtained, the 3-D view is cut into slices, obtain sectioning image；
The contour line of the section is sketched the contours according to the sectioning image, and spline curve fitting is carried out to the contour line；
The u direction characteristic node vector of the unification SPL, and construct spline surface；
The triangle gridding summit of the surface model is calculated, triangle mesh curved surface is generated.
2. method according to claim 1, it is characterised in that it is described the contour line is carried out spline curve fitting it
Afterwards, before the u direction characteristic node vector of the unification SPL, including：
The curvature of the head and the tail end points of the SPL is adjusted, so that the SPL continual curvature.
3. method according to claim 1, it is characterised in that the u direction characteristic node of the unification SPL
Vector, including：
Obtain the control point of SPL；
Multiple single node insertion is carried out to the control point, the unified knot vector of curve is calculated.
4. method according to claim 1, it is characterised in that the construction spline surface, including：
SPL v direction character knot vectors are calculated using averaging method；
Spline surface is constructed according to the SPL u direction characteristic node vector v direction character knot vector.
5. method according to claim 1, it is characterised in that
After construction spline surface, also include before being calculated the triangle gridding summit of the surface model：
The operation at adjustment control point is received, and according to the operation and control point topological relation adjustment control point；
Accordingly, the calculating triangle gridding summit, including：
Triangle gridding summit is calculated according to the control point after adjustment.
6. method according to claim 1, it is characterised in that methods described also includes：
According to the triangle gridding and topological relation, section area is calculated,
The virtual internal organs volume of calculating is overlapped to the section.
7. a kind of internal organs threedimensional model construction device, it is characterised in that include：
Sectioning image acquisition module, for obtaining the 3-D view that scanning is obtained, cuts into slices to the 3-D view, and acquisition is cut
Picture；
Fitting module, for the contour line of the section is sketched the contours according to the sectioning image, and carries out batten to the contour line
Curve matching；
Constructing module, for unifying the u direction characteristic node vector of the SPL, and constructs spline surface；
Generation module, for being calculated the triangle gridding summit of the surface model, generates triangle mesh curved surface.
8. device according to claim 7, it is characterised in that described device also includes：
Adjusting module, for adjusting the curvature of the head and the tail end points of the SPL, so that the SPL continual curvature.
9. device according to claim 7, it is characterised in that the constructing module includes：
Control point acquiring unit, for obtaining the control point of SPL；
Computing unit, for multiple single node insertion is carried out to the control point, is calculated the unified knot vector of curve.
10. device according to claim 7, it is characterised in that the constructing module is used for：
SPL v direction character knot vectors are calculated using averaging method；
Spline surface is constructed according to the SPL u direction characteristic node vector v direction character knot vector.
11. devices according to claim 7, it is characterised in that described device also includes：
Adjusting module, for receiving the operation at adjustment control point, and according to the operation and the adjustment control of control point topological relation
Point；
Accordingly, the computing module is used for：
Triangle gridding summit is calculated according to the control point after adjustment.
12. devices according to claim 7, it is characterised in that described device also includes：
Area calculation module, for according to the triangle gridding and topological relation, calculating section area,
Volume calculations module, for being overlapped the virtual internal organs volume of calculating to the section.
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| CN110009721A (en) * | 2018-01-04 | 2019-07-12 | 奥多比公司 | Generate the triangle gridding of the image indicated by curve |
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| WO2022141368A1 (en) * | 2020-12-31 | 2022-07-07 | 西安大医集团股份有限公司 | Consistency adjustment method and apparatus for global normal vector of medical contour data |
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