InitRech 2015/2016, sujet 14

BROUILLON TO BE CONTINUED....

SUMMARY

The article argue mainly about the interest of computer simulator in the interventional radiology.It is not an easy task to realize or to create a real time simulator.The main problem is to find solution when a blending occurs between 2 vessels(eg.:internal hemorrhage,...) This requires a blood vessel surface;some engineers focused their interest on the real time simulation in term of vizualisation by proposing an algorithm model. This algorithm model embraces 5 points. the first one consist into representing a surface by a mathematical formulation.With this formulation we will able to do a sum of sphères. after the conceptual phase,they deal with an other point:minimization of the energy in order to avoid collision.As we know,every body cell needs energy to be functionnal.A surface can be describe as a plan which means that it is defined by many points(cells).The Lennard Jones energy validate the model. They also tried to subdivise the blob

they consider an optimization subdivision.the subdivision can occasion a high number of blob sections.Which is not reliable because may lead to a collision. They use the model for simulation by taking due account the Equipment used in medical field.

They made experiences by using 5 patient data.the data involve the internal carotid artery.they ysed the Cauchy algorithm for its efficiency and Lennard-Jones energy(described above). However,some geometric errors occur and had to be fixed by Taubin's approximate distance.But 2 parameters had to be taken into account such as the distance between 2 blobs and the number of subdivision. the other point to tackle was to quantify the the efficiency of the model and computation time3.modelizing one patient take an half hour.the goal was to comùpare the number of blobs and the number of triangle on the isosurface.in one hand the test was conclusive but in other hand the model is not able to simulate the vessel due to discontinuities. in conclusion, the model has been integrated in the simulation software and tested on a pecific patient,in the future a global perspective within sight is to use make simulation with image data.

results

MAIN CONTRIBUTION

to be continued.....

SOME APPLICATIONS and INTERESTS

There are a lot of applications especially in the medical domain.During the intervention,it is better for a doctor to visualize exactly what is happening in real time.It is very interesting for internal hemorrhage for example, or in case of cerebrovascular accident,or liver treatment,...goitre and thyroid dysfunction.. it will guaranty precision and will reduce chirurgical accidents.