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The segmentation of Lung lesions is a challenging task because of the complexity of lung lesions surroundings. Lung lesions can be categorized into two types: solid and non-solid. Lots of works have been developed previously to segment one of two types, but only a few are proposed to handle two types at the same time and these methods may be over-segmented or sub-segmented. Therefore, in this study,...
The liver is one of the largest internal organs in the human body and has the most complicated vascular system. However, it is difficult to obtain very high-quality images in clinical. Meanwhile, a good understanding and observation of skeleton lines of the liver vessel system is one of the key factors to the judgment and planning of surgeries. To recover the diameter information lost both in the...
Liver segmentation is the fundamental step in computer-aided liver disease diagnosis and surgery planning. In this study, we developed a fully automatic liver extraction scheme based on an adaptive fast marching method (FMM). Firstly, a thresholding operation was applied to remove the ribs, spines and kidneys. Followed by a smooth filter for noise reduction. Secondly, a nonlinear gray scale converter...
Ka-Band high power, low voltage standing wave ratio (VSWR) and insertion loss single toroid type ferrite phase shifter is designed and simulated. Differential phase shift (DPS), insertion loss, high power characteristics and impedance matching are determined and optimized using finite element solver in Ansoft HFSS. The effect of high order modes propagating in the structure is examined. <1.2dB...
There are three kinds of blood vessel systems in liver and these different kinds of vessels are typically visible in each phase of contrast enhanced liver CT Data. In order to merge the different information into one image, image registration should be applied. In this paper, a hybrid image registration for different phases of contrast enhanced liver CT data was studied. Firstly, a rigid registration...
CT and MR images have been used in the liver disease treatment. In order to merge the different information into one image, image registration and data fusion must be adopted. In this paper, image registration and data fusion for MR and CT images of liver was studied. Firstly, the maximization of mutual information method was proposed to register the images. Then, some optimization algorithms, such...
Generating tetrahedral meshes from CT slices is a very important step in a hepatic surgical simulation. Manual creating of these tetrahedrons is often very hard or impossible, because of hepatic geometry complexity. Therefore we have developed a common framework for generating liver tetrahedral FEM models from CT slices. This framework is consists of several steps includes liver segmentation, 3D reconstruction,...
In order to study the mechanism of the aqueous humor circulation and its relationship to the glaucoma macroscopically with engineering methods, a dynamistic model was presented, which can be used to simulate the situation of the primary angle closure glaucoma (PACG). The frame of the model was built based on the ophthalmic ally accepted feedback mechanism between the aqueous humor circulation and...
There are three kinds of blood vessel systems in liver and the localization of each intrahepatic vessel system is one of the most important issues for liver surgery. These different kinds of vessels are typically visible in each phase of contrast enhanced liver CT Data. In order to merge the different information into one image, image registration and data fusion must be adopted. In this paper, image...
The coupling fibre vibration sensor is a new kind of whole fibre-optic vibration apparatus. It used single-mode fibre-optic as the basic structure, In the awl fused pulling process, change it's parameter. Making it more sensitive to the outside interference, and thus detect the signals. Since the fibre-optic have characteristic such as strong anti- electromagnetism interference, anti-corrosion, bear...
There are three kinds of blood vessel systems in liver and the localization of each intrahepatic vessel system is one of the most important issues for liver surgery. In order to reconstruct all the vessels from the contrast-enhanced CT date, image registration must be adopted. In this paper, the registration of contrast-enhanced liver CT data in different phases was studied. Firstly, we proposed a...
In this study, the finite-difference time-domain (FDTD) method is applied to simulate the through-wall-sensing (TWS) with ultra-wideband signals. Perfectly matched layer (PML) absorbing boundary conditions are used to absorb the outgoing wave. Scattering from two-dimensional (2D) metallic and dielectric cylinders for a 2D TE plane-incident wave are considered. In addition the scattering from targets...
Liver segmentation on computed tomography (CT) images is a challenging task because the images are often corrupted by noise and sampling artifacts. Thus we choose GVF snake to perform the task. Unfortunately, GVF snake use Gaussian function to generate the edge map. We find that this often cause new problems such as blur the liver boundary. To avoid this, a Canny edge detector is a good choice. Another...
Some methods for registration of human eyes tissue images were described in this paper. Firstly, the algorithm of moment and principal axes was used to register the image sequence of eye's tissue slices in the rough. Then, a modified segmentation-counting registration algorithm was proposed to register the image sequence more accurately, which is not only as precision as maximization of mutual information...
In order to study the mechanism of the aqueous humor circulation and its relationship to the glaucoma macroscopically with engineering methods, a dynamistic model was presented, which can be used to simulate the situation and the treatment of the primary open angle glaucoma (POAG). The frame of the model was built based on the ophthalmically accepted feedback mechanism between the aqueous humor circulation...
Hepatic vessel system is one of the most complex vessel systems in human body. For liver surgical planning, morphology and topology analysis of the hepatic vessel system is of our major interest. In this article, we present a new method to analyze the liver vessel system. Starting from the raw CT data set, vessel system is segmented. Based on that, then skeleton line of the vessel system is extracted...
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