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Guo, Yanrong,Gao, Yaozong,Shao, Yeqin,Price, True,Oto, Aytekin,Shen, Dinggang Published for the American Association of Physicis 2014 Medical physics Vol.41 No.7
<P>Automatic prostate segmentation from MR images is an important task in various clinical applications such as prostate cancer staging and MR-guided radiotherapy planning. However, the large appearance and shape variations of the prostate in MR images make the segmentation problem difficult to solve. Traditional Active Shape/Appearance Model (ASM/AAM) has limited accuracy on this problem, since its basic assumption, i.e., both shape and appearance of the targeted organ follow Gaussian distributions, is invalid in prostate MR images. To this end, the authors propose a sparse dictionary learning method to model the image appearance in a nonparametric fashion and further integrate the appearance model into a deformable segmentation framework for prostate MR segmentation.</P>
Ahmet A. Kiykim,Ahmet Camsari,Serkan Kahraman,Mustafa Arici,Bulent Altun,Dilek Cicek,Yunus Erdem,Unal Yasavul,Cetin Turgan,Sali Caglar,Aytekin Oto 연세대학교의과대학 2004 Yonsei medical journal Vol.45 No.2
Cardiovascular disease (CVD) is still the major cause of the morbidity and mortality in hemodialysis (HD) patients. The characteristics of major arterial changes, atherosclerosis and related risk factors in HD patients remain unclear. We aimed to evaluate the atherosclerotic process in asymptomatic HD patients and healthy volunteers, and to determine the association between the risk factor(s) and the atherosclerotic process in these groups. 92 HD patients (female: 43, male: 49) and 62 age and sex matched healthy volunteers (female: 27, male: 35) were enrolled in this study. Diabetics, smokers, and patients with symptomatic CVD were excluded. The right and left carotid intima-media thicknesses (CIMTs) were measured and plaque structures were studied by B-mode ultrasound. The mean CIMT in patients and control group were 0.79±0.16 mm and 0.54±0.09mm, respectively. Mean CIMT in HD patients was thicker (p<0.001) and the presence ratio of plaque was higher in patients group (n=38, %61.2 vs n=9, %17.3) (p<0.001). Calcified type of plaque was more frequent in HD patients than control group. Age (r=0.48, p<0.001), left ventricular mass (r=0.42, p<0.05), and homocysteine (r=0.46, p<0.01), mean hematocrit (r=-0.36, p<0.05), plasma CRP (r=0.50, p<0.001), ESR (r=0.43, p<0.01) and albumin (r= -0.34, p<0.05) levels were correlated with the CIMT measurements and plaque presence, significantly. -CIMT as an atherosclerotic process indicator is thicker in asymptomatic HD patients than healthy subjects. We concluded that in addition to various classical risk factors, uremic environment may also contribute to acceleration of the atherosclerotic process.