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显微三维分析软件设计与开发
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作者 薛斌党 姜志国 +1 位作者 陈进 周孝宽 《中国体视学与图像分析》 2005年第1期41-45,共5页
论述了显微三维分析软件系统的组织结构和程序流程; 针对因离焦光线的干扰而产生的模糊光学断层图像序列, 基于断层内相邻像素和断层间相邻像素的相关信息, 采用改进的最大期望算法对光学断层图像序列进行去模糊处理; 对去模糊处理后的... 论述了显微三维分析软件系统的组织结构和程序流程; 针对因离焦光线的干扰而产生的模糊光学断层图像序列, 基于断层内相邻像素和断层间相邻像素的相关信息, 采用改进的最大期望算法对光学断层图像序列进行去模糊处理; 对去模糊处理后的三维光学断层图像序列, 介绍了一种基于表面点绘制的三维数据场表面重建反走样方法, 加快了重建速度, 同时具有较好的显示效果; 三维体绘制时, 提出了多维半自动阻光度转换函数解决方案, 清晰地显示出了物体内部的细节变化; 采用基于体素的方法计算重建后的物体的表面积和体积; 通过三维分割和标记算法, 实现了在三维空间内选择感兴趣目标的操作。 展开更多
关键词 光学断层显微技术 去模糊 三维面绘制 三维体绘制 表面积估计 体积估计
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Comparison of GFR by Creatinine Clearance with Estimated GFR by Various Prediction Equations in a Bangladeshi Population
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作者 Muhammad Saiedullah Muhammad Rezwanur Rahman +2 位作者 Md. Aminul Haque Khan Shoma Hayat ShahnajBegum 《Journal of Life Sciences》 2012年第3期330-334,共5页
Glomerular filtration rate (GFR) is considered as the best marker of kidney function. Evaluation of various prediction equations to estimate GFR is rare in our population. The aim of this study was to compare GFR es... Glomerular filtration rate (GFR) is considered as the best marker of kidney function. Evaluation of various prediction equations to estimate GFR is rare in our population. The aim of this study was to compare GFR estimated by various prediction equations with GFR by creatinine clearance (GFRer) in Bangladeshi population. Serum creatinine and 24 hours urinary creatinine concentrations were measured in 216 adult Bangladeshi subjects (100 males and 116 females). Creatinine clearance rate was calculated and adjusted for body surface area to obtain GFRcr. GFR was also calculated by CKD-EPI, MDRD4, Cockcroft-Gault, Jelliffe, Mawer, Bjornsson, Gates, Apollo-Chennai and Mayo Clinic prediction equations and compared with GFRcr. Results were expressed as mean + SD and compared by two-tailed paired t-test, precision (r2) and receiver-operating characteristic curve. Mean ± SD of age of the total subjects was 57.15 ±10.96 years. The mean GFILzr was 42.41 ± 22.95 mL/min/1.73m2. Estimated GFR (eGFR) by CKD-EPI, MDRD4, Cockcroft-Gault, Jelliffc 1, Jelliffe 2, Mawer, Bjornsson, Gates, Apollo-Chennai and Mayo Clinic prediction equations were 8.19 ± 13.80, 5.30 ±13.61, 11.54 ± 16.86, 8.66± 18.64, 17.25 ± 19.98, 10.86 ± 22.48, 14.60 ± 17.92, 12.18 ± 16.42, 39.86 ± 21.96 and 20.47 ± 20.49 mL/min/1.73m2 higher than GFR, (P 〈 0.001). The precision (r2) of eGFRs were 0.7114, 0.6924, 0.6431, 0.4802, 0.5048, 0.5921, 0.6286, 0.6158, 0.1635, and 0.5586 for CKD-EPI, MDRD4, Cockcroft-Gault, Jelliffe 1, Jelliffe 2, Mawer, Bjornsson, Gates, Apollo-Chennai and Mayo Clinic prediction equations, respectively. The area under receiver-operating characteristic curve was the lowest for MDRD4 equation. This study revealed that GFR estimated by standardized MDRD4 variables equation is closer to creatinine clearance rate in the study population. 展开更多
关键词 Glomerular filtration rate estimated GFR creatinine clearance rate CCR MDRD.
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