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Liver segmentation in MR Image is the first step of our automated liver perfusion analysis project. Traditional Level Set methods and active contours were often used to segment the liver, but the results were not always promising due to noise and the low gradient response on the liver boundary. In this paper we propose a novel level set based variational(More)
Liver segmentation in MR Image is the foundational work for further research in our lab. Traditional Level Set methods and active contours were often used to segment the liver, but the results were not always promising due to noise and the low gradient response on the liver boundary. In this paper we propose a novel level set based variational approach that(More)
An optimization method for diffractive superresolution elements (DSEs) for radially polarized light is proposed. Only the longitudinal component of the focused field of radially polarized light is considered for optimization, and the results are 0, pi two-phase distributed DSEs. A series of such DSEs are designed, and the corresponding superresolution(More)
Given the fact of failure of PCB detection and diagnosis equipment for a type of ballistic missile in locating faulty component, PCB detection and diagnosis system for a type of ballistic missile is developed by integrating such technologies as microprocessor-based testing technology, fault diagnosis technology and embedded technology to realize accurate(More)
OBJECTIVE To study the clinical features and treatments of jugular foramen neurinomas. The approximate approach and proper exposure regions of jugular foramen tumour were discussed in this paper. METHODS Fourteen cases of jugular foramen neurinomas were diagnosed by CT, MRI, DSA and 3D-CT reconstruction preoperatively. The tumours were resected by far(More)
OBJECTIVE To evaluate the clinical value of three-dimensional computed tomographic angiography (3D-CTA) in embolization of ruptured intracranial aneurysms with Guglielmi detachable coil (GDC). METHODS From December 1998 to February 2002, 175 consecutive patients with acute subarachnoid hemorrhage (SAH) underwent 3D-CTA on the day of admission. All the(More)
The vertebrae registration is very important to treat the vertebrae diseases. As the vertebrae has rigid bones and soft tissue, the traditional nonrigid registration canpsilat work well on that. In this paper, a novel multi-stage nonrigid registration with rigid constraint to the vertebrae is presented. Firstly, A new rigid transform constraint is(More)
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