Three Dimension Construction Of Brain And Surgical Navigation Pathway Planning Of Craniotomy

Brain tumor is harmful to human health, currently removed by surgery is the mosteffective treatment method, but taking into account the high risk of craniotomy, in order toavoid big incision on scalp which just according to doctor’s experience and reduce patient’strauma, it is very necessary to study effective method of surgical navigation pathway planning.There is no mature software for clinical and now mainly used stereotactic positioning headframe or surgical navigation equipment to locate brain tumor and finally guide the surgicalpathway, but the hardware is expensive and cumbersome to operate, on the other hand it isstill not precise enough to plan surgical pathway just according the tumor spatial location.Method of surgical navigation pathway planning which base on the three-dimensional brainreconstruction is proposed through exchanges and cooperation with the neurosurgeon, inwhich mainly solve problems of the real-time interaction of the two-dimensional medicalimage processing, accurate extraction of the tumor contour, three-dimensional brainreconstruction and three-dimensional scene printing of actual size.Display the two-dimensional medical image in three-dimensional sapce by texturemapping method, which can realize interactive image processing including geometrictransformation, slice browsing, mark and measurment through the adjustment of view volume,these image processing method could assist doctor to obtain useful information from medicalimages and display the tumor region clearly. Then umor region could be decomposed into intoseveral sub-regions through semi-automatic real-time contour extraction method whichbased on domin decomposition, extract each sub-region’s isoline to access smooth contouroutline, with original contour combined to produce the final precise tumor surface contour.Tumor volume can be calculated according to the closed contour, the tumors surfacereconstruction also can be done based on the contour or iso-surface. To obtain better effect ofscalp surface reconstruction, two-dimensional medical image data filtering, thresholdsegmentation, morphological processing, boundary information restore operation should bedone before scalp surface rendering using marching cube method.From the results of three-dimensional reconstruction can visually see the spatial locationof the tumor in the brain, crop this three-dimensional image into memory, according to thereverse coordinate transformation method to compute the actual size of the memory image,determine the magnification used to print memory image with the actual size, this projectionresult could guide the design of intraoperative scalp incision.Build surgical navigation pathway planning software used in craniotomy, firstly import the medical image data sets, then improve display quality in software through thetwo-dimensional image processing, extract the tumor contour through interactive domaindecomposition method, reconstruct scalp and tumor to acess three-dimensional image, finallymaking pathway planning according to the output of the tumor projection results, clinicalapplication results show that this planning method is fast and accurate, the accuracy of tumorlocalization is almost the same with surgical navigation equipment, and does not requireexpensive hardware equipment,not rely on the doctor’s experience, therefore this method hasgreat value and promotion space.