CN109727296A - Curved surface projection display methods, system, computer media and the equipment of root canal inner cavity - Google Patents
Curved surface projection display methods, system, computer media and the equipment of root canal inner cavity Download PDFInfo
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- CN109727296A CN109727296A CN201811610457.9A CN201811610457A CN109727296A CN 109727296 A CN109727296 A CN 109727296A CN 201811610457 A CN201811610457 A CN 201811610457A CN 109727296 A CN109727296 A CN 109727296A
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Abstract
The present invention provides curved surface projection display methods, system, computer media and the equipment of a kind of root canal inner cavity, method includes: the CT medical image for obtaining root canal inner cavity, from the cross-sectional view strength of the CT medical image of root canal inner cavity interception target tooth, the root canal center mark point of target tooth is taken in the cross-sectional view strength interval layer choosing of target tooth, to constitute a point set；Using the point set constituted, a root canal curve is fitted by spline interpolation on the cross-sectional view strength of target tooth；Root canal curve is combined with the Coronal direction of target tooth or sagittal plain direction, establishes a root canal curved surface by root canal curve, the width of the curved surface is equal to the width of coronal-plane or sagittal plane；The CT medical image of root canal inner cavity is mapped into root canal curved surface, to generate convenient for the curved surface view of observation root canal inner cavity.The present invention can intuitively illustrate root canal morphology, enable a physician to clearly observe focal area, so that planning is more in line with individuation, reduce the failure rate of operation.
Description
Technical field
The invention belongs to technical field of medical image processing, it is related to a kind of display methods and system, more particularly to one kind
Curved surface projection display methods, system, computer media and the equipment of root canal inner cavity.
Background technique
Root canal treatment (root canal therapy) is that commonly effective treatment method is (primary for dental pulp disease and periapical disease
Property root canal treatment is made an appointment the clinical observation of pain).The principle of root canal therapy is to remove root canal by mechanically and chemically method
Interior most of infectious agent, and by root canal filling, closing bizet, prevent periapical lesion or promotes the root having occurred and that
The healing (application of the ultrasonic technique in root canal treatment) that periapical desease becomes.But root canal treatment is clinically remained at present
Failure case, main cause are root canal charge less, omit root canal (judging failure factors in root canal therapy using CBCT).And CBCT is imaged
Precision is high, can 3 D stereo observe lesion, having a clear superiority in difficult root canal treatment compared with x-ray Dental X-ray film, (CBCT is in difficult root
Applied analysis in governance treatment).It can be provided with power reference frame for the determination of the cause of disease, and the formulation of anaphase scheme is risen and is closed
Key effect.
Therefore, how curved surface projection display methods, system, computer media and the equipment of a kind of root canal inner cavity are provided, with
Power reference frame can not be provided with for the determination of the cause of disease by solving the prior art, cause doctor that can not clearly observe focal area,
The defects of improving the failure rate of operation, has become those skilled in the art's technical problem urgently to be resolved in fact.
Summary of the invention
In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide a kind of curved surface projections of root canal inner cavity
Display methods, system, computer media and equipment, for solve the prior art can not for the cause of disease determination be provided with power refer to according to
According to the problem of causing doctor that can not clearly observe focal area, improve the failure rate of operation.
In order to achieve the above objects and other related objects, the curved surface projection that one aspect of the present invention provides a kind of root canal inner cavity is shown
Show method, comprising: the CT medical image for obtaining root canal inner cavity, from the cross-section of the CT medical image of root canal inner cavity interception target tooth
Face view takes the root canal center mark point of target tooth in the cross-sectional view strength interval layer choosing of target tooth, to constitute a point set；Benefit
With the point set constituted, on the cross-sectional view strength of target tooth by spline interpolation fit one for establish observation root canal
The root canal curve of the curved surface of inner cavity；The root canal curve is combined with the Coronal direction of target tooth or sagittal plain direction,
A root canal curved surface by the root canal curve is established, the width of the curved surface is equal to the width of coronal-plane or sagittal plane；By root
The CT medical image of tube cavity maps to the root canal curved surface, to generate convenient for the curved surface view of observation root canal inner cavity.
In one embodiment of the invention, chosen in the cross-sectional view strength of target tooth every at least one layer of pixel separation
The root canal center mark point of target.
It is described using the point set constituted in one embodiment of the invention, lead on the cross-sectional view strength of target tooth
Crossing the step of spline interpolation fits the root canal curve of a curved surface for establishing observation root canal inner cavity includes: by the point set
In the coordinates of all root canal center mark points be ranked up from high to low；It is several in the interpolation of two root canal center mark points
Point；According to the first default fit approach, if spline interpolation fitting is carried out to the point set that insertion is done, to fit root canal curve.
In one embodiment of the invention, the Coronal direction or sagittal plain by the root canal curve and target tooth
Direction combines, and establishes a root canal curved surface by the root canal curve, and the width of the curved surface is equal to coronal-plane or sagittal plane
Width the step of include: by the root canal curve all the points coordinate be added after divided by root canal center mark point number,
Obtain a datum mark；By datum mark along Coronal direction or sagittal plain direction orthogonal direction vector and the vector it is opposite
After direction carries out the half of translation CT medical image width, the first side point and the second side point are obtained；Pass through datum mark, the first side point
The first plane, the second plane and the are determined respectively with the orthogonal direction vector in the second side point and Coronal direction or sagittal plain direction
Three planes；The root canal curve is projected respectively to first plane, second plane and the third plane, to obtain
First drop shadow curve, the second drop shadow curve, third drop shadow curve；According between the pixel under Coronal direction or sagittal plain direction
Away from, in first drop shadow curve, second drop shadow curve, the centre of the third drop shadow curve along Coronal direction or
The orthogonal direction vector in sagittal plain direction forms surface points collection every the point on one curve of a pel spacing interpolation, all curves；
Surface points concentration is selected into four points for being capable of forming the smallest rectangle of area；Three are selected from 4 points to be capable of forming
The point of area minimum tri patch；The root canal curved surface is constituted by the minimum tri patch formed.
In one embodiment of the invention, the point on all curves is fitted to by surface points by the second default fit approach
Collection.
It is described that the CT medical image of root canal inner cavity is mapped into the root canal curved surface in one embodiment of the invention, with
Generating convenient for the step of curved surface view of observation root canal inner cavity includes: each pixel on the CT medical image for acquire root canal inner cavity
Pixel value；Pixel identical with the pixel value of pixel on the root canal curved surface in pixel collected is mapped into institute
It states on root canal curved surface.
Another aspect of the present invention provides a kind of curved surface projection display system of root canal inner cavity, comprising: module is obtained, for obtaining
The CT medical image for taking root canal inner cavity, from the cross-sectional view strength of the CT medical image of root canal inner cavity interception target tooth, in target
The cross-sectional view strength interval layer choosing of tooth takes the root canal center mark point of target tooth, to constitute a point set；First establishes module, uses
In using the point set that has constituted, on the cross-sectional view strength of target tooth by spline interpolation fit one for establish observation
The root canal curve of the curved surface of root canal inner cavity；Second establishes module, for by the Coronal side of the root canal curve and target tooth
To or sagittal plain direction combine, establish a root canal curved surface by the root canal curve, the width of the curved surface is equal to coronal
The width of face or sagittal plane；Mapping block, for the CT medical image of root canal inner cavity to be mapped to the root canal curved surface, to generate
Convenient for observing the curved surface view of root canal inner cavity.
In one embodiment of the invention, the curved surface projection display system of the root canal inner cavity further include: display module is used
In the curved surface view for showing the root canal inner cavity.
Another aspect of the invention provides a kind of computer media, is stored thereon with computer program, the computer program quilt
Processor realizes the curved surface projection display methods of the root canal inner cavity when executing.
Last aspect of the present invention provides a kind of equipment characterized by comprising processor and memory；The storage
Device is for storing computer program, and the processor is used to execute the computer program of the memory storage, so that described set
The standby curved surface projection display methods for executing the root canal inner cavity.
As described above, the curved surface projection display methods of root canal inner cavity of the present invention, system, computer media and setting
It is standby, it has the advantages that
Curved surface projection display methods, system, computer media and the equipment of root canal inner cavity of the present invention by intending manually
Root canal path is closed, one is established and is intuitively opened up by the curved surface in root canal path by pixel projection corresponding in CBCT in the curved surface
Root canal morphology is shown, has enabled a physician to clearly observe focal area, so that planning is more in line with individuation, reduce the failure of operation
Rate.
Detailed description of the invention
Fig. 1 is shown as flow diagram of the curved surface projection display methods of root canal inner cavity of the invention in an embodiment.
Fig. 2 is shown as the flow diagram of S12 in the curved surface projection display methods of root canal inner cavity of the invention.
Fig. 3 is shown as the flow diagram of S13 in the curved surface projection display methods of root canal inner cavity of the invention.
Fig. 4 is shown as theory structure signal of the curved surface projection display system of root canal inner cavity of the invention in an embodiment
Figure.
Component label instructions
| 4 | The curved surface projection display system of root canal inner cavity |
| 40 | Obtain module |
| 41 | First establishes module |
| 42 | Second establishes module |
| 43 | Mapping block |
| 44 | Display module |
| S11~S15 | Step |
| S121~S123 | Step |
| S131~S138 | Step |
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.It should be noted that in the absence of conflict, following embodiment and implementation
Feature in example can be combined with each other.
It should be noted that illustrating the basic structure that only the invention is illustrated in a schematic way provided in following embodiment
Think, only shown in schema then with related component in the present invention rather than component count, shape and size when according to actual implementation
Draw, when actual implementation kenel, quantity and the ratio of each component can arbitrarily change for one kind, and its assembly layout kenel
It is likely more complexity.
Embodiment one
The present embodiment provides a kind of curved surface projection display methods of root canal inner cavity, comprising:
The CT medical image for obtaining root canal inner cavity is regarded from the cross section of the CT medical image of root canal inner cavity interception target tooth
Figure, takes the root canal center mark point of target tooth in the cross-sectional view strength interval layer choosing of target tooth, to constitute a point set；
Using the point set constituted, one is fitted for building by spline interpolation on the cross-sectional view strength of target tooth
The root canal curve of the curved surface of vertical observation root canal inner cavity；
The root canal curve is combined with the Coronal direction of target tooth or sagittal plain direction, establishes one by institute
The root canal curved surface of root canal curve is stated, the width of the curved surface is equal to the width of coronal-plane or sagittal plane；
The CT medical image of root canal inner cavity is mapped into the root canal curved surface, to generate convenient for the curved surface of observation root canal inner cavity
View.
The curved surface projection display methods of root canal inner cavity provided by the present embodiment is retouched in detail below with reference to diagram
It states.Referring to Fig. 1, being shown as flow diagram of the curved surface projection display methods of root canal inner cavity in an embodiment.Such as Fig. 1 institute
Show, the curved surface projection display methods of the root canal inner cavity specifically includes following steps:
S11 obtains the CT medical image of root canal inner cavity, from the cross-section of the CT medical image of root canal inner cavity interception target tooth
Face view takes the root canal center mark point P of target tooth in the cross-sectional view strength interval layer choosing of target tooth, to constitute a point set
S0。
Specifically, every in the root canal that at least one layer of pixel separation chooses target in the cross-sectional view strength of target tooth
Heart index point P constitutes a point set S0, S0={ Pi| i=0,1,2...n }, i is the number of root canal center mark point.
S12 utilizes the point set S constituted0, one is fitted by spline interpolation on the cross-sectional view strength of target tooth
For establishing the root canal curve of the curved surface of observation root canal inner cavity.
Referring to Fig. 2, being shown as the flow diagram of S12.As shown in Fig. 2, the S12 includes the following steps:
S121, by the point set S0In all root canal center mark point PiCoordinate be ranked up from high to low.In this reality
It applies in example, the distance between two neighboring root canal center mark point is D, and the minimum pixel spacing of CT medical image is S.
S122, in several points of interpolation of two root canal center mark points.The quantity n=D/S of the point of interpolation.
S123, according to the first default fit approach, if spline interpolation fitting is carried out to the point set that insertion is done, to fit
Root canal curve S0.In the present embodiment, the root canal curve S0Referred to as Bezier.
The first default fit approach is as follows:
Wherein, PiFor i-th of root canal center mark point, Bi,n(ui) indicate n times Bernstein polynomial, u indicate curve
Tangent line normal vector at upper each root canal center mark point, uiTangent line normal vector at i-th of root canal center mark point on expression curve.
S13, by the root canal curve S0It is combined with the Coronal direction of target tooth or sagittal plain direction, establishes one
By the root canal curved surface of the root canal curve, the width of the curved surface is equal to the width of coronal-plane or sagittal plane.
Referring to Fig. 3, being shown as the flow diagram of S13.As shown in figure 3, the S13 includes the following steps:
S131, by the root canal curve S0Divided by the number of root canal center mark point after the coordinate addition of upper all the points, obtain
To a datum mark P0。
S132, by datum mark P0Along the orthogonal direction vector in Coronal direction or sagittal plain directionAnd the vector
After opposite direction carries out the half of translation CT medical image width W, the first side point P is obtained1With the second side point P2；
S133 passes through datum mark P0, the first side point P1With the second side point P2It is orthogonal with Coronal direction or sagittal plain direction
Direction vectorThe first plane S P is determined respectively0, the second plane SP1And third plane SP2；
S134, by the root canal curve S0It is projected respectively to the first plane S P0, the second plane SP1And it is described
Third plane SP2, to obtain the first drop shadow curve S1, the second drop shadow curve S2, third drop shadow curve S3；
S135, according to the pel spacing under Coronal direction or sagittal plain direction (for example, pel spacing or Y in X-direction
Pel spacing on direction), in the first drop shadow curve S1, the second drop shadow curve S2, the third drop shadow curve S3's
Centre along Coronal direction or sagittal plain direction orthogonal direction vectorEvery one curve of a pel spacing interpolation, Suo Youqu
Point on line forms surface points collection S5.In the present embodiment, the point on all curves is fitted by the second default fit approach
At curved surface point set S5。
The second default fit approach is as follows:
Wherein, PiFor i-th of root canal center mark point, Bi,n(ui) indicate n times Bernstein polynomial, u indicate curve
Tangent line normal vector at upper each root canal center mark point, uiTangent line normal vector at i-th of root canal center mark point on expression curve,
T indicates that the orthogonal direction vector in Coronal direction or sagittal plain direction, m indicate that K generates the sum of straight line along the direction t, indicate
Along the straight line that the translation of the direction t generates, j indicates each of these straight line.
S136, by the curved surface point set S5In select four points for being capable of forming the smallest rectangle of area.In the present embodiment
In, this four points are selected according to sequence from top to bottom from left to right, and four vertex are denoted as D1, D2, D3, D4。
S137, from 4 point D1, D2, D3, D4Middle selection three is capable of forming the point of area minimum tri patch.
For example, by D1D2D4, D1D3D4Connection forms two minimum tri patch.
S138, by curved surface point set S5Middle all the points are formed the rule of minimum tri patch by connection, by the minimum three formed
Edged surface piece constitutes the root canal curved surface.
The CT medical image of root canal inner cavity is mapped to the root canal curved surface by S14, to generate convenient for observation root canal inner cavity
Curved surface view.
Specifically, the S14 includes:
Acquire the pixel value of each pixel on the CT medical image of root canal inner cavity；
Pixel identical with the pixel value of pixel on the root canal curved surface in pixel collected is mapped into institute
It states on root canal curved surface.
S15 shows the curved surface view of the root canal inner cavity.
The present embodiment also provides a kind of computer media (also known as computer readable storage medium), is stored thereon with calculating
Machine program, the computer program realize the curved surface projection display methods of the root canal inner cavity when being executed by processor.
Those of ordinary skill in the art will appreciate that: realize that all or part of the steps of above-mentioned each method embodiment can lead to
The relevant hardware of computer program is crossed to complete.Computer program above-mentioned can store in a computer readable storage medium
In.When being executed, execution includes the steps that above-mentioned each method embodiment to the program；And storage medium above-mentioned include: ROM,
The various media that can store program code such as RAM, magnetic or disk.
The curved surface projection display methods of root canal inner cavity described in the present embodiment establishes a warp by being fitted root canal path manually
The curved surface for crossing root canal path intuitively illustrates root canal morphology, enables the clinician to by pixel projection corresponding in CBCT in the curved surface
It is enough clearly to observe focal area, so that planning is more in line with individuation, reduces the failure rate of operation.
Embodiment two
The present embodiment provides a kind of curved surface projection display systems of root canal inner cavity, comprising:
Module is obtained, for obtaining the CT medical image of root canal inner cavity, intercepts target from the CT medical image of root canal inner cavity
The cross-sectional view strength of tooth takes the root canal center mark point of target tooth in the cross-sectional view strength interval layer choosing of target tooth, with structure
At a point set；
First establishes module, for being inserted by batten on the cross-sectional view strength of target tooth using the point set constituted
Value fits the root canal curve of a curved surface for establishing observation root canal inner cavity；
Second establishes module, for mutually tying the root canal curve and the Coronal direction of target tooth or sagittal plain direction
It closes, establishes a root canal curved surface by the root canal curve, the width of the curved surface is equal to the width of coronal-plane or sagittal plane；
Mapping block, for the CT medical image of root canal inner cavity to be mapped to the root canal curved surface, to generate convenient for observation
The curved surface view of root canal inner cavity.
The curved surface projection display system of root canal inner cavity provided by the present embodiment is retouched in detail below with reference to diagram
It states.Referring to Fig. 4, being shown as theory structure schematic diagram of the curved surface projection display system of root canal inner cavity in an embodiment.Such as
Shown in Fig. 4, the curved surface projection display system 4 of the root canal inner cavity includes: to obtain module 40, first establish module 41, second build
Formwork erection block 42, mapping block 43 and display module 44.
The CT medical image for obtaining module 40 and being used to obtain root canal inner cavity, intercepts from the CT medical image of root canal inner cavity
The cross-sectional view strength of target tooth takes the root canal center mark point P of target tooth in the cross-sectional view strength interval layer choosing of target tooth,
To constitute a point set S0。
Specifically, the acquisition module 40 is used in the cross-sectional view strength of target tooth every at least one layer of pixel separation
The root canal center mark point P of target is chosen, a point set S is constituted0, S0={ Pi| i=0,1,2...n }, i is root canal center mark
The number of point.
First couple with the acquisition module 40 establishes module 41 and is used to utilize the point set S that has constituted0, in target tooth
Cross-sectional view strength on by spline interpolation fit one for establishes observe root canal inner cavity curved surface root canal curve.
Specifically, described first module 41 is established for by the point set S0In all root canal center mark point PiSeat
Mark is ranked up from high to low；In several points of interpolation of two root canal center mark points；It is right according to the first default fit approach
If being inserted into the point set done carries out spline interpolation fitting, to fit root canal curve S0。
In the present embodiment, the distance between two neighboring root canal center mark point is D, the minimum pixel of CT medical image
Spacing is S.
The quantity n=D/S of the point of interpolation.
The root canal curve S0Referred to as Bezier.
The first default fit approach is as follows:
Wherein, PiFor i-th of root canal center mark point, Bi,n(ui) indicate n times Bernstein polynomial, u indicate curve
Tangent line normal vector at upper each root canal center mark point, uiTangent line normal vector at i-th of root canal center mark point on expression curve.
With described first establishes that module 41 couples second establishes module 42 for by the root canal curve S0With target tooth
The Coronal direction or sagittal plain direction of tooth combine, and establish a root canal curved surface by the root canal curve, the curved surface
Width is equal to the width of coronal-plane or sagittal plane.
Specifically, described second module 42 is established for by the root canal curve S0The coordinates of upper all the points be added after divided by
The number of root canal center mark point, obtains a datum mark P0；By datum mark P0Along the orthogonal of Coronal direction or sagittal plain direction
Direction vectorAnd the opposite direction of the vector carry out translation CT medical image width W half after, obtain the first side point P1With
Second side point P2；Pass through datum mark P0, the first side point P1With the second side point P2With the orthogonal side in Coronal direction or sagittal plain direction
To vectorThe first plane S P is determined respectively0, the second plane SP1And third plane SP2；By the root canal curve S0It projects respectively
To the first plane S P0, the second plane SP1And the third plane SP2, to obtain the first drop shadow curve S1, second
Drop shadow curve S2, third drop shadow curve S3；According to the pel spacing under Coronal direction or sagittal plain direction (for example, in X-direction
Pel spacing or Y-direction on pel spacing), in the first drop shadow curve S1, the second drop shadow curve S2, described
Three drop shadow curve S3Centre along Coronal direction or sagittal plain direction orthogonal direction vectorEvery a pel spacing interpolation
One curve, the point on all curves form surface points collection S5；By the curved surface point set S5In select four be capable of forming area minimum
Rectangle point.In the present embodiment, this four points are selected according to sequence from top to bottom from left to right, and four vertex are remembered
For D1, D2, D3, D4；From 4 point D1, D2, D3, D4Middle selection three is capable of forming the point of area minimum tri patch；By S5Middle institute
Have and press the rule that connection forms minimum tri patch, the root canal curved surface is constituted by the minimum tri patch formed.
For example, by D1D2D4, D1D3D4Connection forms two minimum tri patch.
In the present embodiment, the point on all curves is fitted to by curved surface point set S by the second default fit approach5。
The second default fit approach is as follows:
Wherein, PiFor i-th of root canal center mark point, Bi,n(ui) indicate n times Bernstein polynomial, u indicate curve
Tangent line normal vector at upper each root canal center mark point, uiTangent line normal vector at i-th of root canal center mark point on expression curve,
T indicates that the orthogonal direction vector in Coronal direction or sagittal plain direction, m indicate that K generates the sum of straight line along the direction t, indicate
Along the straight line that the translation of the direction t generates, j indicates each of these straight line.
The mapping block 43 that module 42 couples is established with the acquisition module 40 and described second to be used for root canal inner cavity
CT medical image maps to the root canal curved surface, to generate convenient for the curved surface view of observation root canal inner cavity.
Specifically, the mapping block 43 is used to acquire the pixel of each pixel on the CT medical image of root canal inner cavity
Value；Pixel identical with the pixel value of pixel on the root canal curved surface in pixel collected is mapped into the root canal
On curved surface.
The display module 44 coupled with the mapping block 43 is used to show the curved surface view of the root canal inner cavity.
It should be noted that it should be understood that the modules of system above division be only a kind of logic function division,
It can completely or partially be integrated on a physical entity in actual implementation, it can also be physically separate.And these modules can be with
It is all realized, can also be all realized in the form of hardware by way of processing element calls with software, it can also part mould
Block realizes that part of module passes through formal implementation of hardware by way of processing element calls software.Such as: x module can be
The processing element individually set up also can integrate and realize in some chip of above system.In addition, x module can also be with
The form of program code is stored in the memory of above system, called by some processing element of above system and executed with
The function of upper x module.The realization of other modules is similar therewith.These modules completely or partially can integrate together, can also be with
It is independent to realize.Processing element described here can be a kind of integrated circuit, the processing capacity with signal.In the process of realization
In, each step of the above method or the above modules can by the integrated logic circuit of the hardware in processor elements or
The instruction of software form is completed.The above module can be arranged to implement the integrated electricity of one or more of above method
Road, such as: one or more specific integrated circuit (Application Specific Integrated Circuit, abbreviations
ASIC), one or more microprocessors (Digital Singnal Processor, abbreviation DSP), one or more scene
Programmable gate array (Field Programmable Gate Array, abbreviation FPGA) etc..When some above module passes through processing
When the form of element scheduler program code is realized, which can be general processor, such as central processing unit (Central
Processing Unit, abbreviation CPU) or it is other can be with the processor of caller code.These modules can integrate one
It rises, is realized in the form of system on chip (System-on-a-chip, abbreviation SOC).
Embodiment three
The present embodiment provides a kind of equipment, comprising: processor, memory, transceiver, communication interface or/and system bus；
Memory and communication interface connect with processor and transceiver by system bus and complete mutual communication, and memory is used for
Computer program is stored, communication interface is used for and other equipment are communicated, and processor and transceiver are for running computer journey
Sequence makes equipment execute each step of the curved surface projection display methods of root canal inner cavity as above.
System bus mentioned above can be Peripheral Component Interconnect standard (Peripheral Component
Interconnect, abbreviation PCI) bus or expanding the industrial standard structure (Extended Industry Standard
Architecture, abbreviation EISA) bus etc..The system bus can be divided into address bus, data/address bus, control bus etc..
Communication interface is for realizing the communication between database access device and other equipment (such as client, read-write library and read-only library).
Memory may include random access memory (Random Access Memory, abbreviation RAM), it is also possible to further include non-volatile
Property memory (non-volatile memory), for example, at least a magnetic disk storage.
Above-mentioned processor can be general processor, including central processing unit (Central Processing Unit,
Abbreviation CPU), network processing unit (Network Processor, abbreviation NP) etc.；It can also be digital signal processor
(Digital Signal Processing, abbreviation DSP), specific integrated circuit (Application Specific
Integrated Circuit, abbreviation ASIC), field programmable gate array (Field Programmable Gate Array,
Abbreviation FPGA) either other programmable logic device, discrete gate or transistor logic, discrete hardware components.
The protection scope of the curved surface projection display methods of root canal inner cavity of the present invention, which is not limited to the present embodiment, to be enumerated
The step of step executes sequence, the prior art that all principles according to the present invention are done increase and decrease, step replace realized side
Case is included in protection scope of the present invention.
The present invention also provides a kind of curved surface projection display system of root canal inner cavity, the curved surface projection of the root canal inner cavity is shown
The curved surface projection display methods of root canal inner cavity of the present invention, but the song of root canal inner cavity of the present invention may be implemented in system
The realization device of face method for displaying projection includes but is not limited to the curved surface projection display system for the root canal inner cavity that the present embodiment is enumerated
Structure, the malformation and replacement of the prior art that all principles according to the present invention are done are included in guarantor of the invention
It protects in range.
In conclusion the curved surface projection display methods of root canal inner cavity of the present invention, system, computer media and equipment are logical
Fitting root canal path manually is crossed, a curved surface by root canal path is established, by pixel projection corresponding in CBCT in the curved surface,
Root canal morphology is intuitively illustrated, enables a physician to clearly observe focal area, planning is made to be more in line with individuation, reduces hand
The failure rate of art.The present invention effectively overcomes various shortcoming in the prior art and has high industrial utilization value.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause
This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as
At all equivalent modifications or change, should be covered by the claims of the present invention.
Claims (10)
1. a kind of curved surface projection display methods of root canal inner cavity characterized by comprising
The CT medical image for obtaining root canal inner cavity intercepts the cross-sectional view strength of target tooth from the CT medical image of root canal inner cavity,
The root canal center mark point of target tooth is taken in the cross-sectional view strength interval layer choosing of target tooth, to constitute a point set；
Using the point set constituted, on the cross-sectional view strength of target tooth by spline interpolation fit one for establish sight
Examine the root canal curve of the curved surface of root canal inner cavity；
The root canal curve is combined with the Coronal direction of target tooth or sagittal plain direction, one is established and passes through described
The root canal curved surface of pipe curve, the width of the curved surface are equal to the width of coronal-plane or sagittal plane；
The CT medical image of root canal inner cavity is mapped into the root canal curved surface, to generate the curved surface view convenient for observation root canal inner cavity
Figure.
2. the curved surface projection display methods of root canal inner cavity according to claim 1, which is characterized in that in the cross of target tooth
The root canal center mark point of target is chosen in view profile every at least one layer of pixel separation.
3. the curved surface projection display methods of root canal inner cavity according to claim 1, which is characterized in that described utilize has been constituted
Point set, on the cross-sectional view strength of target tooth by spline interpolation fit one for establishes observe root canal inner cavity song
The step of root canal curve in face includes:
The coordinate for all root canal center mark points that the point is concentrated is ranked up from high to low；
In several points of interpolation of two root canal center mark points；
According to the first default fit approach, if spline interpolation fitting is carried out to the point set that insertion is done, to fit root canal curve.
4. the curved surface projection display methods of root canal inner cavity according to claim 1, which is characterized in that described by the root canal
Curve is combined with the Coronal direction of target tooth or sagittal plain direction, and it is bent to establish a root canal by the root canal curve
The step of face, the width of the curved surface is equal to the width of coronal-plane or sagittal plane includes:
Divided by the number of root canal center mark point after the coordinate of all the points on the root canal curve is added, a datum mark is obtained；
Datum mark is carried out along the opposite direction of the orthogonal direction vector and the vector in Coronal direction or sagittal plain direction
After the half for translating CT medical image width, the first side point and the second side point are obtained；
Distinguished by the orthogonal direction vector in datum mark, the first side point and the second side point and Coronal direction or sagittal plain direction true
Fixed first plane, the second plane and third plane；
The root canal curve is projected respectively to first plane, second plane and the third plane, to obtain
One drop shadow curve, the second drop shadow curve, third drop shadow curve；
According to the pel spacing under Coronal direction or sagittal plain direction, in first drop shadow curve, second projection is bent
Line, the centre of the third drop shadow curve is along the orthogonal direction vector in Coronal direction or sagittal plain direction every between a pixel
Away from one curve of interpolation, the point on all curves forms surface points collection；
Surface points concentration is selected into four points for being capable of forming the smallest rectangle of area；
Three points for being capable of forming area minimum tri patch are selected from 4 points；
The root canal curved surface is constituted by the minimum tri patch formed.
5. the curved surface projection display methods of root canal inner cavity according to claim 4, which is characterized in that default quasi- by second
Point on all curves is fitted to curved surface point set by conjunction mode.
6. the curved surface projection display methods of root canal inner cavity according to claim 4, which is characterized in that described by root canal inner cavity
CT medical image map to the root canal curved surface, with generate convenient for observation root canal inner cavity curved surface view the step of include:
Acquire the pixel value of each pixel on the CT medical image of root canal inner cavity；
Pixel identical with the pixel value of pixel on the root canal curved surface in pixel collected is mapped to described
On pipe curved surface.
7. a kind of curved surface projection display system of root canal inner cavity characterized by comprising
Module is obtained, for obtaining the CT medical image of root canal inner cavity, intercepts target tooth from the CT medical image of root canal inner cavity
Cross-sectional view strength, the root canal center mark point of target tooth is taken in the cross-sectional view strength interval layer choosing of target tooth, to constitute one
Point set；
First establishes module, for being intended by spline interpolation on the cross-sectional view strength of target tooth using the point set constituted
Close out the root canal curve of a curved surface for establishing observation root canal inner cavity；
Second establishes module, for the root canal curve to be combined with the Coronal direction of target tooth or sagittal plain direction,
A root canal curved surface by the root canal curve is established, the width of the curved surface is equal to the width of coronal-plane or sagittal plane；
Mapping block, for the CT medical image of root canal inner cavity to be mapped to the root canal curved surface, to generate convenient for observation root canal
The curved surface view of inner cavity.
8. the curved surface projection display system of root canal inner cavity according to claim 7, which is characterized in that the root canal inner cavity
Curved surface projection display system further include:
Display module, for showing the curved surface view of the root canal inner cavity.
9. a kind of computer media, is stored thereon with computer program, which is characterized in that the computer program is executed by processor
The curved surface projection display methods of root canal inner cavity described in Shi Shixian any one of claims 1 to 6.
10. a kind of equipment characterized by comprising processor and memory；
The memory is used to execute the computer journey of the memory storage for storing computer program, the processor
Sequence, so that the equipment executes the curved surface projection display methods of the root canal inner cavity as described in any one of claims 1 to 6.
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