CN102722905A - Progressive display design for catheter and heart - Google Patents
Progressive display design for catheter and heart Download PDFInfo
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- CN102722905A CN102722905A CN2012101563298A CN201210156329A CN102722905A CN 102722905 A CN102722905 A CN 102722905A CN 2012101563298 A CN2012101563298 A CN 2012101563298A CN 201210156329 A CN201210156329 A CN 201210156329A CN 102722905 A CN102722905 A CN 102722905A
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Abstract
The invention relates to a method based on reconstruction of scattered point cloud and display of three-dimension heart model. The model provided in the invention is of a topological structure, and operation steps of model establishing and displaying are as follows: (1) human heart model is reconstructed by utilizing scattered and disordered 3D point cloud; (2) optimization is carried out on the model; (3) the catheter is established; (4) index is established at the apex of the heart model; (5) the catheter is moved, and a point which is nearest to the catheter is found is found according to the index; (6) projection is established at the point; and (7) a function of projection size is set, and color is selected. According to the above steps, compromising consideration can be carried out on speed and accuracy, wherein the speed can be controlled to be not too slow, but also an accurate distance can be calculated as far as possible, such that the occurrence of incorrect manipulations of operators is avoided. The model established in the invention is smooth and accuracy and can assist in diagnosis and treatment of the heart.
Description
Technical field
The present invention relates to a kind of method, should belong to Flame Image Process and medical domain based on dispersion point cloud reconstruction and demonstration three-dimensional cardiac model.Be applicable to heart disease, the patient that need not begin to speak to perform the operation can treat patient's heart through catheter head.
Background technology
Along with the progress in epoch, field of medical images has also had corresponding development, and this very ripe software of VTK has obtained using widely in the medical science category.The head that mainly is based upon conduit near demonstration of conduit can integrated various chips be used for parameters such as gaging pressure, temperature, blood flow, helps the doctor to find diseased region.And more international cases are functions that conduit itself also has treatment; For example can launching electromagnetic wave; The function of heat-killed sick cell; Yet these all need catheter head to press close to heart to accomplish, so the distance of conduit and heart is a very crucial technical indicator, are related to the quality of result of treatment.
Summary of the invention
The objective of the invention is to the defective to existing technology, provide a kind of and rebuild and the method for the cardiac module that shows, help diagnosis and treatment heart based on dispersion point cloud.For achieving the above object; The present invention's design is: Model Optimization is segmented for the cardiac module to triangle gridding here; The model that obtains after the segmentation is more smoothly meticulous; The summit quantity that obtains also can increase a lot, and the internal memory occupancy also increases to some extent certainly, but projection is meticulousr method for conduit.Here adopt the method for linear segmentation, because the Linear divided method is a kind of method of interpolation, also on the degree of accuracy of model, have very great help simplely so it has well kept raw data points, efficient height and effect are fine.
When searching the minimum distance of conduit and heart, used the kd-tree algorithm.This algorithm is the classical sort method to unordered some cloud, and this method is commonly used to search 2 nearest points, is that a kind of data structure of being convenient to the search of the point in the space improves a lot for the efficient of searching closest approach through the data after sorting.K is the tree degree of depth spatially, and kd-tree also has the characteristics that a little are evenly distributed, so the efficiency ratio of search is higher, its speed is also very fast.
The selection of projection function is also very crucial, the projection that the present invention wants be when conduit during near heart projection change to some extent, when infinite near the time projected size be that catheter head is big or small.When the closer to the time, size variation is more greatly that the present invention expects.We know that the log curve is at dependent variable increasing function of rate of change when a certain numerical value.So the function of selecting is a log function, is here:
According to the foregoing invention design, the present invention just has following technical proposals:
A kind of method based on dispersion point cloud reconstruction of three-dimensional cardiac module is characterized in that this model is the topological structure of taking a walk.Said modelling foundation and display operation step are following: (1) at first utilizes unordered three-dimensional point cloud at random to reconstruct the cardiac module of human body; (2) model is optimized the foundation of (3) conduit; (4) index is set up on the summit on cardiac module; (5) move conduit, find from the nearest point of conduit according to index; (6) set up projection at this some place; (7) function of projected size is set, and color is selected.The present invention compared with prior art, have following conspicuous outstanding substantive distinguishing features and marked improvement: model of the present invention is walked topological structure, the model that obtains is accurately level and smooth more, helps diagnosis and treatment to heart.
Description of drawings
Fig. 1 is the explanation of formula (1), and wherein (a) figure is a logarithmic function, and (b) figure is the function after (a) figure does translation left, and (c) figure is the function after the upset, and (d) figure is that the function that finally obtains is the function of formula (1);
Fig. 2 is the tow sides that utilize the cardiac module that raw data rebuilds out;
Fig. 3 is the tow sides of the cardiac module of Linear after encrypting;
Fig. 4 is the projection of conduit at master pattern;
The projection of Fig. 5 conduit on cardiac module after the encryption.
Embodiment
The sub-accompanying drawings of a preferred embodiment of the present invention is following:
Referring to Fig. 1-Fig. 5, this is based on the reconstruction of point at random and show that the concrete operations step of method of three-dimensional cardiac model is following:
1 at first carries out three-dimensional reconstruction to unordered cloud data at random, obtains the cardiac module of triangle gridding;
2 then the heart three-dimensional model that obtains to be optimized be model segmentation, adopts the linear divided method, not only makes model surface smooth, and obtain more grid and summit, can obtain more accurate result in asymptotic demonstration place of follow-up conduit;
3 simulate catheter.The simulation conduit be the object of a circle, with the center as a reference basic point carry out the calculating of distance, be exactly very little but the electrode of certain error conduit itself is arranged, so radius is almost ignored.Conduit can arbitrarily move, and moves with the mouse drag conduit here, and what simulate catheter was real moves;
Closest approach searches on 4 conduits and the heart.Here key is the effect of kd-tree.At first utilize kd-tree to sort unordered cloud data at random, search after the ordering and the minimum point of distance of confirming point, and store;
The 5 nearest some computed ranges that find according to a last step, it be crucial needing real-time renewal.Each conduit moves all and will call top step 4, and distance display is come out;
6 Projection Display.Realize the drafting of projection at the nearest some place that finds, projection is represented with ball.The radii size of ball is with following function calculation.
Radius is the radii size of projection ball in this function, and dis is the minimum distance of conduit and heart, and radius is a conduit radius, and abs (dis-radius) is for getting the ABS function of distance.
is logarithmic function because logarithmic function have characteristics be exactly value be to present the big trend of rate of change along with parameter during near certain value.The meaning of
this expression formula be when conduit and heart distance during near null value its value be zero.
this function has been guaranteed when conduit and heart distance is zero; The big or small infinite size of projection near conduit; When the closer to the time; The variation of projected size is obvious more, can reach the possibility that reduces doctor's maloperation.
Claims (1)
1. this patent is a kind of method based on dispersion point cloud reconstruction and demonstration three-dimensional cardiac model, it is characterized in that this model is the topological structure of taking a walk;
Said modelling foundation and display operation step are following: (1) at first utilizes unordered three-dimensional point cloud at random to reconstruct the cardiac module of human body; (2) model is optimized the foundation of (3) conduit; (4) index is set up on the summit on cardiac module; (5) move conduit, find from the nearest point of conduit according to index; (6) set up projection at this some place; (7) function of projected size is set, and color is selected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101563298A CN102722905A (en) | 2012-05-21 | 2012-05-21 | Progressive display design for catheter and heart |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101563298A CN102722905A (en) | 2012-05-21 | 2012-05-21 | Progressive display design for catheter and heart |
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| CN102722905A true CN102722905A (en) | 2012-10-10 |
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| CN2012101563298A Pending CN102722905A (en) | 2012-05-21 | 2012-05-21 | Progressive display design for catheter and heart |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101067868A (en) * | 2007-05-25 | 2007-11-07 | 同济大学 | System and method for converting disordered point cloud to triangular net based on adaptive flatness |
| CN101138505A (en) * | 2007-10-17 | 2008-03-12 | 李延辉 | Heart four-dimensional reestablishment imaging method and system |
| CN102663158A (en) * | 2012-03-14 | 2012-09-12 | 中国航天员科研训练中心 | Simulation method for ablation catheter of atrial fibrillation |
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2012
- 2012-05-21 CN CN2012101563298A patent/CN102722905A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101067868A (en) * | 2007-05-25 | 2007-11-07 | 同济大学 | System and method for converting disordered point cloud to triangular net based on adaptive flatness |
| CN101138505A (en) * | 2007-10-17 | 2008-03-12 | 李延辉 | Heart four-dimensional reestablishment imaging method and system |
| CN102663158A (en) * | 2012-03-14 | 2012-09-12 | 中国航天员科研训练中心 | Simulation method for ablation catheter of atrial fibrillation |
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Application publication date: 20121010 |