CN203634288U - Mark point used for optical surgery navigation system - Google Patents
Mark point used for optical surgery navigation system Download PDFInfo
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- CN203634288U CN203634288U CN201320788034.2U CN201320788034U CN203634288U CN 203634288 U CN203634288 U CN 203634288U CN 201320788034 U CN201320788034 U CN 201320788034U CN 203634288 U CN203634288 U CN 203634288U
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- gauge point
- base
- navigation system
- mark point
- protrusion
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- 230000003287 optical effect Effects 0.000 title claims abstract description 14
- 238000001356 surgical procedure Methods 0.000 title abstract 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 3
- 238000012545 processing Methods 0.000 abstract description 2
- 238000001914 filtration Methods 0.000 description 9
- 239000000203 mixture Substances 0.000 description 7
- 230000011218 segmentation Effects 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000284 extract Substances 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 238000012216 screening Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000002372 labelling Methods 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The utility model discloses a mark point used for an optical surgery navigation system. The mark point is matched with a light emitting ball for use and comprises a base and a protrusion positioned on the upper surface of the base, a groove is formed inside the light emitting ball, the protrusion corresponds to the groove in shape and is embedded in the protrusion, the base and the protrusion are of an integrally-formed structure, and the protrusion and the base are symmetric according to a same vertical axis. The mark point can be automatically extracted through simple image processing, so that automatic registration difficulty of the mark point is lowered, and overall positioning accuracy of the optical surgery navigation system is improved.
Description
Technical field
This utility model relates to field of medical images, is specifically related to a kind of gauge point for optical operation navigation system.
Background technology
Optical operation navigation system integrative medicine image, intuitively for doctor provides position and the direction of operating theater instruments with respect to focus region, can guide by real-time visual image, and guided operation carries out, and improves safety, effectiveness and the accuracy of operation.Optical operation navigation system needs to utilize the gauge point being attached on patient skin to carry out gauge point registration in the preoperative, namely determines the mapping relations in operative space and medical image space.
In optical operation navigation system, near infrared binocular visual system can be identified the luminescent ball of transmitting or reflect near infrared light, but this class luminescent ball CT value is little, on CT image, brightness is low, approach with the CT value of human body most tissues, be difficult to image recognition algorithm, luminescent ball automatically be extracted, also just cannot realize gauge point auto registration by luminescent ball.The material of conventional gauge point is long-lived rustless steel or plastics with low cost, but rustless steel gauge point can produce artifact on image, reduce picture quality, affect the diagnosis of doctor to the state of an illness, the gauge point of general plastic material gray value and tissue on CT image are more or less the same, and are unfavorable for automatic extraction.
Utility model content
The shortcoming and deficiency that exist in order to overcome prior art, provide a kind of gauge point for optical operation navigation system.
This utility model is realized gauge point and is automatically extracted, and reduces gauge point auto registration difficulty, improves operation guiding system overall accuracy.
The technical solution of the utility model:
A kind of gauge point for optical operation navigation system, described gauge point and luminescent ball support the use, comprise base and be positioned at the projection of base upper surface, described luminescent ball inside has groove, the shape of described projection is corresponding with the groove of luminescent ball, and embedding groove, described base and the projection structure that is one of the forming, and projection and base are about same vertical axis symmetry.
Described gauge point is made up of polrvinyl chloride.
Described base is cylindrical structure.
Described base bottom arranges sticker.
For an image extraction method for the gauge point of optical operation navigation system, comprise the steps:
S1 obtains the CT image sequence that comprises gauge point, builds 3-D view;
S2 is to 3-D view filtering, and recycling Threshold segmentation is processed, and obtains the 3-D view that comprises gauge point and skeleton;
S3 carries out connected component labeling to the image that comprises gauge point and skeleton, and calculates the contained voxel number of each connected region;
S4 is according to the number of the contained voxel of gauge point in the interval calculation 3-D view of voxel in the volume of gauge point and S2 3-D view, set number of voxels mesh sieve and select scope, according to S3 result of calculation, extract the connected region within the scope of screening, non-marked point composition in preliminary filtering S2 3-D view, obtains all gauge points and a small amount of voxel number composition suitable with gauge point;
S5 sets the scope of two voxel maximum spacings in connected region according to gauge point size, after calculating the preliminary filtering of S4, obtain the maximum spacing between interior two voxels of each connected region in 3-D view, retain the connected region of maximum spacing within the scope of maximum spacing, accurately filtering non-marked point composition, obtain only containing the 3-D view of gauge point, further determine the three-dimensional coordinate of gauge point.
Described gauge point size is specially the distance of gauge point projection top to base bottom edge place.
The beneficial effects of the utility model:
(1) the material C T value of gauge point of the present utility model, higher than human skin tissue, can not produce artifact to medical image;
(2) it can be extracted automatically by simple image processing, reduce gauge point auto registration difficulty, improve operation guiding system precision;
(3) gauge point structure of the present utility model has jut, and registration accuracy rate is improved.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of a kind of gauge point for optical operation navigation system of this utility model;
Fig. 2 is the structural representation that this utility model gauge point structure embeds luminescent ball groove.
The specific embodiment
Below in conjunction with embodiment and accompanying drawing, this utility model is described in further detail, but embodiment of the present utility model is not limited to this.
Embodiment
A kind of gauge point for optical operation navigation system, described gauge point and luminescent ball 3 support the use, described luminescent ball 3 inside are provided with groove, gauge point comprises base 2 and is positioned at the projection 1 of base upper surface, as shown in Figure 2, the shape of described projection is corresponding with groove shapes, and embedding groove, described base and the projection structure that is one of the forming, and projection and base are about same vertical axis symmetry, the gauge point that the present embodiment adopts as shown in Figure 1, projection 1 total height is 12.2mm, narrowest diameter is 2.1mm, the widest part diameter is 5.5mm, base 2 is cylindrical structure.
Described base arranges sticker, when gauge point registration, gauge point need to be pasted on patient skin, for preventing its landing, adopts the alite paste of environmentally-friendly sanitary to be fixedly affixed on patient skin as sticker.
In order to allow, gauge point brightness on CT image is high, convenient extracts, and image is not produced to interference component, and this utility model adopts CT value to make higher than human skin tissue material, preferably polrvinyl chloride.
Gauge point is embedded in luminescent ball groove, be attached to and on patient skin, scan out CT image, gray value and the skeleton of gauge point in CT image is close, apparently higher than skin histology, easily identification, use Threshold Segmentation Algorithm can make gauge point separate with skin histology, and image is not produced to the interference such as artifact.
This utility model design jut, be allowed to condition on a certain section asymmetric, to improve registration accuracy.
Adopt with the following method that complete extraction is out from CT image by this utility model gauge point:
S1 reads the CT image sequence that comprises gauge point, and to 3-dimensional reconstruction, builds 3-D view;
S2 carries out medium filtering to 3-D view, a large amount of noise spot in filtering 3-D view, and recycling Threshold Segmentation Algorithm is processed filtering result, and 3-D view after treatment comprises the higher composition of the CT such as gauge point and skeleton value; In described Threshold Segmentation Algorithm, selected threshold value is higher than the gray value of skin histology in 3-D view, lower than the gray value of gauge point.
S3 carries out connected component labeling to the image that comprises gauge point and skeleton, and calculates the contained voxel number of each connected region;
S4 is according to the number of the contained voxel of each gauge point in the interval calculation 3-D view of voxel in the volume of gauge point and S2 3-D view, set number of voxels mesh sieve and select scope, it is 2500-3500 that the present embodiment setting number of voxels mesh sieve selects scope, gauge point is under different threshold ranges is processed, segmentation result difference, so contained voxel number is also different, and the CT image of different bed thickness, the contained voxel number of gauge point is also different, and therefore this screening scope is only applicable to the present embodiment; According to S3 result of calculation, extract the connected region within the scope of screening, the non-marked point composition in preliminary filtering S2 3-D view, obtains all gauge points and a small amount of voxel number composition suitable with gauge point structure;
S5 sets the scope of two voxel maximum spacings in connected region according to gauge point size, calculate the distance B of gauge point projection top to the edge of base end face, and in the present embodiment, D is
Set the scope 16-20mm of two voxel maximum spacings of connected region, calculate two voxel maximum spacings of each connected region in 3-D view, retain the connected region of maximum spacing within the scope of maximum spacing, accurately filtering non-marked point composition, obtain only containing the 3-D view of gauge point structure, then further determine the three-dimensional coordinate of gauge point structure.
Above-described embodiment is preferably embodiment of this utility model; but embodiment of the present utility model is not limited by the examples; other any do not deviate from change, the modification done under spirit of the present utility model and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection domain of the present utility model.
Claims (4)
1. the gauge point for optical operation navigation system, described gauge point and luminescent ball support the use, it is characterized in that, comprise base and be positioned at the projection of base upper surface, described luminescent ball inside has groove, and the shape of described projection is corresponding with the groove of luminescent ball, and embeds groove, described base and the projection structure that is one of the forming, and projection and base are about same vertical axis symmetry.
2. gauge point according to claim 1, is characterized in that, described gauge point is made up of polrvinyl chloride.
3. gauge point according to claim 1, is characterized in that, described base is cylindrical structure.
4. gauge point according to claim 1, is characterized in that, described base bottom arranges sticker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320788034.2U CN203634288U (en) | 2013-12-03 | 2013-12-03 | Mark point used for optical surgery navigation system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320788034.2U CN203634288U (en) | 2013-12-03 | 2013-12-03 | Mark point used for optical surgery navigation system |
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| Publication Number | Publication Date |
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| CN203634288U true CN203634288U (en) | 2014-06-11 |
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| CN201320788034.2U Expired - Fee Related CN203634288U (en) | 2013-12-03 | 2013-12-03 | Mark point used for optical surgery navigation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103654965A (en) * | 2013-12-03 | 2014-03-26 | 华南理工大学 | Mark point used for optical surgical navigation system and image extraction method |
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2013
- 2013-12-03 CN CN201320788034.2U patent/CN203634288U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103654965A (en) * | 2013-12-03 | 2014-03-26 | 华南理工大学 | Mark point used for optical surgical navigation system and image extraction method |
| CN103654965B (en) * | 2013-12-03 | 2016-01-06 | 华南理工大学 | A kind of gauge point for optical operation navigation system and image extraction method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140611 |