Guangyi Zhou

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—In this letter, an unsupervised method for estimating the equivalent number of looks (ENL) in synthetic aperture radar (SAR) images is proposed. Assuming that the multiplicative noise in the SAR images is a unit mean random variable of Gamma distribution parameterized by the ENL, a lookup table between the ENL and the variance of the logarithm of the(More)
SUMMARY In this paper, a new method is proposed for unsupervised speckle level estimation in synthetic aperture radar (SAR) images. It is assumed that fully developed speckle intensity has a Gamma distribution. Based on this assumption, estimation of the equivalent number of looks (ENL) is transformed into noise variance estimation in the logarithmic SAR(More)
BACKGROUND Low socioeconomic status (SES) is associated with increased mortality after stroke in developed countries. This study was performed to determine whether a similar association also exists in China. METHODS A total of 806 patients with first-ever ischemic stroke were enrolled in our study. From August 1999 to August 2005, the three-year all-cause(More)
OBJECTIVE The 5-lipoxygenase catalyzed formation of leukotriene lipid mediators is a mediator for inflammatory response in arteries. The present study investigated the relationship between atorvastatin and the 5-lipoxygenase pathway in an atherosclerotic rabbit model. METHODS Thirty male New Zealand White Rabbits were randomized into negative control,(More)
A 49-year-old female presented with recurrent intolerable right retro-orbital pain, ptosis and diplopia for 4 months. Neurological evaluation revealed right oculomotor nerve and abducent nerve injuries. Neuroimaging found enlarged right cavernous sinus, right intracavernous carotid dissection aneurysm and a stenosis proximal to it. Tolosa-Hunt syndrome(More)
BACKGROUND Matrix metalloproteinases (MMPs) play important roles in the development and destabilization of atherosclerotic plaques. It is known that montelukast inhibits neointimal hyperplasia. However, the underlying mechanisms for the inhibitory effects of montelukast on neointimal formation have been poorly defined. METHODS Thirty-six male New Zealand(More)