CN108175433A - It is imaged in art based on three-dimensional C-arm machine and multigroup knits alignment method and system - Google Patents
It is imaged in art based on three-dimensional C-arm machine and multigroup knits alignment method and system Download PDFInfo
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- CN108175433A CN108175433A CN201711397922.0A CN201711397922A CN108175433A CN 108175433 A CN108175433 A CN 108175433A CN 201711397922 A CN201711397922 A CN 201711397922A CN 108175433 A CN108175433 A CN 108175433A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/50—Clinical applications
- A61B6/505—Clinical applications involving diagnosis of bone
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/02—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computerised tomographs
Abstract
The invention discloses be imaged in the art based on three-dimensional C-arm machine it is multigroup knit alignment method and system, method includes aligning step in preoperative planning step and art；Step is aligned in art and includes following sub-step：S21：Patient's horizontal is placed on operating table；S22：By three-dimensional C-arm machine, pending position, that is, patients with fractures side femur is scanned；S23：To the femur thin layer scanning image of scanning, multiplanar imaging is carried out；S24：Obtain A line lengths α 2 and angle angle beta 2；S25：Preoperative α values α 1, β value β 1 and α values α 2 in art and 2 values of β value β are compared respectively, judge whether femur locations to be caused to change because of patient body position and/or displacement；S26：Changed according to femur locations, adjustment fracture side needs to adjust the actual value of normotopia.The present invention before operation starts while can adjust surgical planning, can also reduce patient and medical staff is exposed to time under ray.
Description
Technical field
It is imaged in art the present invention is based on three-dimensional C-arm machine and multigroup knits alignment method and system.
Background technology
Fracture of neck of femur refer to due to osteoporosis, the muscle group regression of hip week, it is slow in reacting or by severe trauma caused by
Neck of femur fracture.Position blood fortune is poor, if fracture processing not in time, it is inappropriate, can all lead to nonunion or concurrent
Avascular necrosis of femoral head, traumatic arthritis severely impact life.
The form of femoral neck bone folding part is divided into embedded type and dislocation type fracture.The fracture line of this amphitypy fracture of neck of femur can table
It is now fine and close line and/or bright line.Fine and close fracture line represents that the bone trabecula of two fracture ends has overlapping intercalation, and bright fracture line is then
Mean that two fracture ends have separation.（1）Embedded type fracture of neck of femur is without apparent dislocation, the visible fuzzy dense bone of usual neck of femur
Broken line, local bone trabecula interrupt, and small angulation or recess occurs in local cortex of bone, and the outward turning deformity of femoral shaft is small apparent.It is this type of
Fracture belongs to compared with stable fracture.Due to the difference of external force effect when fracture occurs, different degrees of interior receipts, outer can occur for femoral head
Rotation.It leans forward or the angulation deformity of hypsokinesis.Such as occur that built-in end angulation deformity is more apparent or the gradient of fracture line is larger, fracture end
When there are separation or apparent femoral shaft outward turning in part, prompt fracture unstable.（2）Dislocation type fracture of neck of femur is more typical, also known as
Interior receipts type fracture of neck of femur.Two folding ends occur rotating and misplace.Femoral head retreats fracture end angled forward, the outer rotation direction of femoral shaft
Upper dislocation, fracture line separation are apparent.
At present, in Osteopathic Medicine field, judge that reduction of the fracture situation is based primarily upon C-arm in neck of femur closed reduction
Machine.Although common C arm machine can scene obtains patient anatomical's image at any time in art, can not carry out being registrated in preoperative art,
The cross-sectional image being worth with important references can not be also provided.The anatomic information that preoperative CT can be provided enriches, but there are arts
Preceding CT 3D reconstruction models are with suffering from that the registration accuracy between bone anatomical structure is to be improved, it is poor to be registrated real-time, can not in art
Patient anatomical's image is obtained in art, increases a series of problems, such as financial burden of patient.Simultaneously, C-arm machine is had an X-rayed at present
There are distinct disadvantages for the technology of Guided Percutaneous plant nail, are true since C-arm machine perspective can only once obtain the image of single plane
The correctness resetted is protected, operator inevitably needs repeatedly adjustment inside-fixture riding position, and the position of perspective is varied multiple times
It puts and angle, constantly carries out roentgen radiation x, patient and medical staff is made to be exposed under ray for a long time, human body is damaged larger.
Invention content
It is multigroup it is an object of the invention to overcome the deficiencies of the prior art and provide being imaged in the art based on three-dimensional C-arm machine
Knit alignment method and system.
The purpose of the present invention is achieved through the following technical solutions：It is imaged in art based on three-dimensional C-arm machine multigroup
Alignment method is knitted, including aligning step in preoperative planning step and art；The preoperative planning step includes following sub-step：
S11：The original CT image of patient femur's fracture of cervical vertebra side and the original CT image of healthy side are obtained respectively；
S12：The original CT image to side of fracturing and the original CT image of healthy side carry out three-dimensional modeling respectively；
S13：Following operation is performed to the femur three-dimensional modeling image of fracture side and healthy side respectively：
S131：Find two bone mark points respectively on the model of three-dimensional reconstruction, described two bone mark points are big thick
Grand vertex P1, late-segmental collapse point P2；
S132：By greater trochanter vertex P1With late-segmental collapse point P2Connection, obtains A lines, and calculate A line lengths α；
S133：Extend A lines, in all sections perpendicular to A lines on femoral head, find one of a sections, it is described
A sections include femoral head concave point P3, the femoral head concave point P3Small recess bone mark point for femoral head top；
S134：By greater trochanter vertex P1With femoral head concave point P3It is attached, obtains B lines；
S135：B lines are calculated in the projection of a sections and the angle angle beta of B lines；
S14：According to the step S3 α value α -0/ β value β -0 and the α value α -1 of wound side of normal side obtained and β value β -1, calculate
Going out side of fracturing needs to adjust the actual value of normotopia；
Step is aligned in the art and includes following sub-step：
S21：Patient's horizontal is placed on operating table；
S22：By three-dimensional C-arm machine, pending position, that is, patients with fractures side femur is scanned；
S23：To the femur thin layer scanning image of scanning, multiplanar imaging is carried out；
S24：Using the method for step S131 ~ S135, A line length α -2 and angle angle beta -2 are obtained；
S25：Preoperative α values α -1, β value β -1 and α value α -2 in art and β value β -2 values are compared respectively, judged whether because of patient
Position and/or displacement cause femur locations to change；
S26：Changed according to femur locations, adjustment fracture side needs to adjust the actual value of normotopia.
Further, calculating fracture side in step S14 needs the actual value of adjustment normotopia and step S26 adjustment fracture side to need
After the reality for adjusting normotopia, the implant angle of guide pin is designed.
Further, late-segmental collapse point P2Searching mode be：Sphere is filled in femoral head, when in femur
Head outside carries out overlapping comparison with the sphere boundary, and nested area can reach N%, then to be fitted successfully, at this time by the sphere
The centre of sphere is as late-segmental collapse point P2。
Further, the nested area need to reach 95%.
Further, the original CT image is stored with .dicom forms.
Further, the three-dimensional modeling is built using Mimics softwares.
The present invention also provides be imaged in the art based on three-dimensional C-arm machine it is multigroup knit alignment system, including preoperative planning module
With contraposition module in art；The preoperative planning module includes：
Original CT image acquires submodule：For obtaining the original of the original CT image of patient femur's fracture of cervical vertebra side and healthy side respectively
Beginning CT image；
Three-dimensional reconstruction submodule：Original CT image progress three-dimensional for the original CT image respectively to side of fracturing and healthy side is built
Mould；
Three-dimensional modeling image procossing submodule：For respectively to the femur three-dimensional modeling image of fracture side and healthy side at
Reason, including：
Bone mark point finds unit：For finding two bone mark points respectively on the model of three-dimensional reconstruction, described two
A bone mark point is greater trochanter vertex P1, late-segmental collapse point P2；
A line length computing units：For by greater trochanter vertex P1With late-segmental collapse point P2Connection, obtains A lines, and calculate A lines
Length alpha；
Find unit in a sections：For extending A lines, in all sections perpendicular to A lines on femoral head, wherein one is found
A a sections, a sections include femoral head concave point P3, the femoral head concave point P3Small recess bone for femoral head top
Index point；
B line acquiring units：For by greater trochanter vertex P1With femoral head concave point P3It is attached, obtains B lines；
Angle angle beta computing unit：For B lines in the projection of a sections and the angle angle beta of B lines；
Normotopia computational submodule：For obtained according to three-dimensional modeling image procossing submodule the α value α -0/ β value β -0 of normal side,
And the α value α -1 of wound side and β value β -1, calculating fracture side needs to adjust the actual value of normotopia；
Contraposition module includes in the art：
Scan submodule：For by three-dimensional C-arm machine, being scanned to pending position, that is, patients with fractures side femur；
It is imaged submodule：For the femur thin layer scanning image to scanning, multiplanar imaging is carried out；
A line lengths and angle angle calculation submodule：By the way of three-dimensional modeling image procossing submodule, A line lengths are obtained
α -2 and angle angle beta -2；
Displacement is compared and judging submodule：Preoperative α values α -1, β value β -1 and α value α -2 in art and β value β -2 values are compared respectively
Compared with judging whether femur locations to be caused to change because of patient body position and/or displacement；
Normotopia adjusts submodule：Changed according to femur locations, adjustment fracture side needs to adjust the actual value of normotopia.
Further, calculating fracture side in normotopia computational submodule needs to adjust the actual value of normotopia and normotopia adjustment submodule
After block adjustment fracture side needs the reality of adjustment normotopia, the implant angle of guide pin is designed.
Further, late-segmental collapse point P2Searching mode be：Sphere is filled in femoral head, when in femur
Head outside carries out overlapping comparison with the sphere boundary, and nested area can reach N%, then to be fitted successfully, at this time by the sphere
The centre of sphere is as late-segmental collapse point P2。
Further, the nested area need to reach 95%.
Further, the original CT image is stored with .dicom forms, and the three-dimensional modeling is soft using Mimics
Part is built.
The beneficial effects of the invention are as follows：The present invention is by the way of Design, according to fracture side and healthy side neck of femur
Region is compared, and judges the classification of fracture and degree of rotation in patient femur's fracture of cervical vertebra region, mainly includes the length of intercalation/separation
Degree and the angle of fracture rotation；Later in art, by three-dimensional C-arm machine, to pending position, that is, patients with fractures side stock
Bone is scanned and multiplanar imaging, and carries out the angle that the length of intercalation/separation and fracture rotate in the same way
Processing.On the one hand, before operation starts while surgical planning can be adjusted；And on the other hand, contraposition step can also fit in art
After patient is carried out certain closed reduction, for the correctness for ensuring to reset, it is scanned and resets adjustment again, therefore can
To reduce patient and medical staff is exposed to time under ray.
Description of the drawings
Fig. 1 the method for the present invention flow charts.
Specific embodiment
Technical scheme of the present invention is described in further detail below in conjunction with the accompanying drawings：
The present embodiment is suitable for the patient of wherein side fracture of neck of femur and other side neck of femur health.Although in normal condition
Under, the femur of both sides health is not identical, but side After femoral neck fracture wherein, and the neck of femur of healthy side can be with
As marker, convenient for the length/angle for normotopia of performing the operation and determining for guide pin position/orientation.
Be imaged in art based on three-dimensional C-arm machine it is multigroup knit alignment method, as shown in Figure 1, including preoperative planning step and
Step is aligned in art；The preoperative planning step includes following sub-step：
S11：The original CT image of patient femur's fracture of cervical vertebra side and the original CT image of healthy side are obtained respectively；In the present embodiment
In, it can be acquired in a manner of the original CT image that .dicom forms preserve directly obtaining
S12：The original CT image to side of fracturing and the original CT image of healthy side carry out three-dimensional modeling respectively；In the present embodiment
In, the software of three-dimensional reconstruction is Mimics；
S13：Following operation is performed to the femur three-dimensional modeling image of fracture side and healthy side respectively：
S131：Find two bone mark points respectively on the model of three-dimensional reconstruction, described two bone mark points are big thick
Grand vertex P1, late-segmental collapse point P2；
Wherein, since greater trochanter vertex is not very it is clear that therefore its searching mode is repeated herein；And due to femoral head not
It is the spherical shape of a standard, it is also difficult to define the boundary of femoral head and neck of femur, therefore in the present embodiment, late-segmental collapse point
P2It is found by the way of filling and fitting：Specifically, sphere is filled in femoral head, when on the outside of femoral head with it is described
Sphere boundary carries out coincidence comparison, and nested area can reach 95%, then it is assumed that be fitted successfully, at this time using the sphere centre of sphere as
Late-segmental collapse point P2。
S132：By greater trochanter vertex P1With late-segmental collapse point P2Connection, obtains A lines, and calculate A line length α, this A line length
Degree α is used to calculate the length of intercalation/separation；Wherein the α values of normal side are α -0, and the α values of wound side are α -1；
S133：Extend A lines, in all sections perpendicular to A lines on femoral head, find one of a sections, it is described
A sections include femoral head concave point P3, the femoral head concave point P3Small recess bone mark point for femoral head top；
S134：By greater trochanter vertex P1With femoral head concave point P3It is attached, obtains B lines；
S135：B lines are calculated in the projection of a sections and the angle angle beta of B lines；The angle angle beta is used to calculate neck of femur rotation
Angle；Wherein the β value of normal side is β -0, and the β value of wound side is β -1；
S14：According to the step S3 α value α -0/ β value β -0 and the α value α -1 of wound side of normal side obtained and β value β -1, calculate
Going out side of fracturing needs to adjust the actual value of normotopia；It needs the normotopia desired value of α -1 and β -1 being set as α -0, β -0 calculates it
Need the angle and length adjusted.Under normal conditions, including be cross-section value, coronal value and sagittal value.
More preferably, after the procedure, the implant angle of guide pin can also be designed.
Later, step is aligned in the art and includes following sub-step：
S21：Patient's horizontal is placed on operating table；
S22：By three-dimensional C-arm machine, pending position, that is, patients with fractures side femur is scanned；
S23：To the femur thin layer scanning image of scanning, multiplanar imaging is carried out；
S24：Using the method for step S131 ~ S135, A line length α -2 and angle angle beta -2 are obtained；
S25：Preoperative α values α -1, β value β -1 and α value α -2 in art and β value β -2 values are compared respectively, judged whether because of patient
Position and/or displacement cause femur locations to change；
S26：Changed according to femur locations, adjustment fracture side needs to adjust the actual value of normotopia.
Wherein, step is aligned in art in one of the embodiments to be applicable to just put patient on operating table, sentence
The variation of femur locations caused by disconnected patient body position, displacement, therefore before operation starts while surgical planning can be adjusted.
And align step in another embodiment, in art and could be applicable to after patient is carried out certain closed reduction,
It for the correctness for ensuring to reset, is scanned and resets adjustment again, therefore patient can be reduced and medical staff is exposed to and penetrates
Time under line.
Accordingly, the present invention also provides be imaged in the art based on three-dimensional C-arm machine it is multigroup knit alignment system, including preoperative inspection
Look into contraposition module in module and art；The preoperative planning module includes：
Original CT image acquires submodule：For obtaining the original of the original CT image of patient femur's fracture of cervical vertebra side and healthy side respectively
Beginning CT image；
Three-dimensional reconstruction submodule：Original CT image progress three-dimensional for the original CT image respectively to side of fracturing and healthy side is built
Mould；
Three-dimensional modeling image procossing submodule：For respectively to the femur three-dimensional modeling image of fracture side and healthy side at
Reason, including：
Bone mark point finds unit：For finding two bone mark points respectively on the model of three-dimensional reconstruction, described two
A bone mark point is greater trochanter vertex P1, late-segmental collapse point P2；
A line length computing units：For by greater trochanter vertex P1With late-segmental collapse point P2Connection, obtains A lines, and calculate A lines
Length alpha；
Find unit in a sections：For extending A lines, in all sections perpendicular to A lines on femoral head, wherein one is found
A a sections, a sections include femoral head concave point P3, the femoral head concave point P3Small recess bone for femoral head top
Index point；
B line acquiring units：For by greater trochanter vertex P1With femoral head concave point P3It is attached, obtains B lines；
Angle angle beta computing unit：For B lines in the projection of a sections and the angle angle beta of B lines；
Normotopia computational submodule：For obtained according to three-dimensional modeling image procossing submodule the α value α -0/ β value β -0 of normal side,
And the α value α -1 of wound side and β value β -1, calculating fracture side needs to adjust the actual value of normotopia；
Contraposition module includes in the art：
Scan submodule：For by three-dimensional C-arm machine, being scanned to pending position, that is, patients with fractures side femur；
It is imaged submodule：For the femur thin layer scanning image to scanning, multiplanar imaging is carried out；
A line lengths and angle angle calculation submodule：By the way of three-dimensional modeling image procossing submodule, A line lengths are obtained
α -2 and angle angle beta -2；
Displacement is compared and judging submodule：Preoperative α values α -1, β value β -1 and α value α -2 in art and β value β -2 values are compared respectively
Compared with judging whether femur locations to be caused to change because of patient body position and/or displacement；
Normotopia adjusts submodule：Changed according to femur locations, adjustment fracture side needs to adjust the actual value of normotopia.
More preferably, in the present embodiment, normotopia computational submodule calculate fracture side need adjust normotopia actual value and
After normotopia adjustment submodule adjustment fracture side needs the reality of adjustment normotopia, the implant angle of guide pin is designed.
More preferably, in the present embodiment, late-segmental collapse point P2Searching mode be：Ball is filled in femoral head
Body, when carrying out overlapping comparison with the sphere boundary on the outside of femoral head, nested area can reach N%, then to be fitted successfully, this
When using the sphere centre of sphere as late-segmental collapse point P2。
More preferably, in the present embodiment, the nested area need to reach 95%.
More preferably, in the present embodiment, the original CT image is stored with .dicom forms, and the three-dimensional modeling is adopted
It is built with Mimics softwares.
The present invention is described by embodiment, but is not limited the invention, with reference to description of the invention, institute
Other variations of disclosed embodiment, are such as readily apparent that the professional person of this field, such variation should belong to
Within the scope of the claims in the present invention limit.
Claims (10)
1. it is imaged in the art based on three-dimensional C-arm machine and multigroup knits alignment method, it is characterised in that：Including preoperative planning step and art
Middle contraposition step；The preoperative planning step includes following sub-step：
S11：The original CT image of patient femur's fracture of cervical vertebra side and the original CT image of healthy side are obtained respectively；
S12：The original CT image to side of fracturing and the original CT image of healthy side carry out three-dimensional modeling respectively；
S13：Following operation is performed to the femur three-dimensional modeling image of fracture side and healthy side respectively：
S131：Find two bone mark points respectively on the model of three-dimensional reconstruction, described two bone mark points are big thick
Grand vertex P1, late-segmental collapse point P2；
S132：By greater trochanter vertex P1With late-segmental collapse point P2Connection, obtains A lines, and calculate A line lengths α；
S133：Extend A lines, in all sections perpendicular to A lines on femoral head, find one of a sections, it is described
A sections include femoral head concave point P3, the femoral head concave point P3Small recess bone mark point for femoral head top；
S134：By greater trochanter vertex P1With femoral head concave point P3It is attached, obtains B lines；
S135：B lines are calculated in the projection of a sections and the angle angle beta of B lines；
S14：According to the step S3 α value α -0/ β value β -0 and the α value α -1 of wound side of normal side obtained and β value β -1, calculate
Going out side of fracturing needs to adjust the actual value of normotopia；
Step is aligned in the art and includes following sub-step：
S21：Patient's horizontal is placed on operating table；
S22：By three-dimensional C-arm machine, pending position, that is, patients with fractures side femur is scanned；
S23：To the femur thin layer scanning image of scanning, multiplanar imaging is carried out；
S24：Using the method for step S131 ~ S135, A line length α -2 and angle angle beta -2 are obtained；
S25：Preoperative α values α -1, β value β -1 and α value α -2 in art and β value β -2 values are compared respectively, judged whether because of patient
Position and/or displacement cause femur locations to change；
S26：Changed according to femur locations, adjustment fracture side needs to adjust the actual value of normotopia.
2. it is imaged in the art according to claim 1 based on three-dimensional C-arm machine and multigroup knits alignment method, it is characterised in that：
The actual value of adjustment normotopia and step S26 adjustment fracture side is needed to need the reality of adjustment normotopia in step S14 calculating fracture side
Afterwards, the implant angle of guide pin is designed.
3. it is imaged in the art according to claim 1 based on three-dimensional C-arm machine and multigroup knits alignment method, it is characterised in that：
The late-segmental collapse point P2Searching mode be：Sphere is filled in femoral head, when on the outside of femoral head with the sphere
Boundary carries out coincidence comparison, and nested area can reach N%, then to be fitted successfully, at this time using the sphere centre of sphere as in femoral head
Heart point P2。
4. it is imaged in the art according to claim 3 based on three-dimensional C-arm machine and multigroup knits alignment method, it is characterised in that：
The nested area need to reach 95%.
5. it is imaged in the art according to claim 1 based on three-dimensional C-arm machine and multigroup knits alignment method, it is characterised in that：
The original CT image is stored with .dicom forms, and the three-dimensional modeling is built using Mimics softwares.
6. it is imaged in the art based on three-dimensional C-arm machine and multigroup knits alignment system, it is characterised in that：Including preoperative planning module and art
Middle contraposition module；The preoperative planning module includes：
Original CT image acquires submodule：For obtaining the original of the original CT image of patient femur's fracture of cervical vertebra side and healthy side respectively
Beginning CT image；
Three-dimensional reconstruction submodule：Original CT image progress three-dimensional for the original CT image respectively to side of fracturing and healthy side is built
Mould；
Three-dimensional modeling image procossing submodule：For respectively to the femur three-dimensional modeling image of fracture side and healthy side at
Reason, including：
Bone mark point finds unit：For finding two bone mark points respectively on the model of three-dimensional reconstruction, described two
A bone mark point is greater trochanter vertex P1, late-segmental collapse point P2；
A line length computing units：For by greater trochanter vertex P1With late-segmental collapse point P2Connection, obtains A lines, and calculate A line lengths
Spend α；
Find unit in a sections：For extending A lines, in all sections perpendicular to A lines on femoral head, wherein one is found
A a sections, a sections include femoral head concave point P3, the femoral head concave point P3Small recess bone for femoral head top
Index point；
B line acquiring units：For by greater trochanter vertex P1With femoral head concave point P3It is attached, obtains B lines；
Angle angle beta computing unit：For B lines in the projection of a sections and the angle angle beta of B lines；
Normotopia computational submodule：For obtained according to three-dimensional modeling image procossing submodule the α value α -0/ β value β -0 of normal side,
And the α value α -1 of wound side and β value β -1, calculating fracture side needs to adjust the actual value of normotopia；
Contraposition module includes in the art：
Scan submodule：For by three-dimensional C-arm machine, being scanned to pending position, that is, patients with fractures side femur；
It is imaged submodule：For the femur thin layer scanning image to scanning, multiplanar imaging is carried out；
A line lengths and angle angle calculation submodule：By the way of three-dimensional modeling image procossing submodule, A line lengths are obtained
α -2 and angle angle beta -2；
Displacement is compared and judging submodule：Preoperative α values α -1, β value β -1 and α value α -2 in art and β value β -2 values are compared respectively
Compared with judging whether femur locations to be caused to change because of patient body position and/or displacement；
Normotopia adjusts submodule：Changed according to femur locations, adjustment fracture side needs to adjust the actual value of normotopia.
7. it is imaged in the art according to claim 6 based on three-dimensional C-arm machine and multigroup knits alignment system, it is characterised in that：
Calculating fracture side in normotopia computational submodule needs to adjust the actual value of normotopia and normotopia adjustment submodule adjustment fracture side needs
After the reality for adjusting normotopia, the implant angle of guide pin is designed.
8. it is imaged in the art according to claim 6 based on three-dimensional C-arm machine and multigroup knits alignment system, it is characterised in that：
The late-segmental collapse point P2Searching mode be：Sphere is filled in femoral head, when on the outside of femoral head with the sphere
Boundary carries out coincidence comparison, and nested area can reach N%, then to be fitted successfully, at this time using the sphere centre of sphere as in femoral head
Heart point P2。
9. it is imaged in the art according to claim 8 based on three-dimensional C-arm machine and multigroup knits alignment system, it is characterised in that：
The nested area need to reach 95%.
10. it is imaged in the art according to claim 6 based on three-dimensional C-arm machine and multigroup knits alignment system, it is characterised in that：
The original CT image is stored with .dicom forms, and the three-dimensional modeling is built using Mimics softwares.
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