Differentiating autoimmune pancreatitis from pancreatic ductal adenocarcinoma with CT radiomics features

PurposeThe purpose of this study was to determine whether computed tomography (CT)-based machine learning of radiomics features could help distinguish autoimmune pancreatitis (AIP) from pancreatic ductal adenocarcinoma (PDAC).Materials and MethodsEighty-nine patients with AIP (65 men, 24 women; mean age, 59.7 ± 13.9 [SD] years; range: 21–83 years) and 93 patients with PDAC (68 men, 25 women; mean age, 60.1 ± 12.3 [SD] years; range: 36–86 years) were retrospectively included. All patients had dedicated dual-phase pancreatic protocol CT between 2004 and 2018. Thin-slice images (0.75/0.5 mm thickness/increment) were compared with thick-slices images (3 or 5 mm thickness/increment). Pancreatic regions involved by PDAC or AIP (areas of enlargement, altered enhancement, effacement of pancreatic duct) as well as uninvolved parenchyma were segmented as three-dimensional volumes. Four hundred and thirty-one radiomics features were extracted and a random forest was used to distinguish AIP from PDAC. CT data of 60 AIP and 60 PDAC patients were used for training and those of 29 AIP and 33 PDAC independent patients were used for testing.ResultsThe pancreas was diffusely involved in 37 (37/89; 41.6%) patients with AIP and not diffusely in 52 (52/89; 58.4%) patients. Using machine learning, 95.2% (59/62; 95% confidence interval [CI]: 89.8–100%), 83.9% (52:67; 95% CI: 74.7–93.0%) and 77.4% (48/62; 95% CI: 67.0–87.8%) of the 62 test patients were correctly classified as either having PDAC or AIP with thin-slice venous phase, thin-slice arterial phase, and thick-slice venous phase CT, respectively. Three of the 29 patients with AIP (3/29; 10.3%) were incorrectly classified as having PDAC but all 33 patients with PDAC (33/33; 100%) were correctly classified with thin-slice venous phase with 89.7% sensitivity (26/29; 95% CI: 78.6–100%) and 100% specificity (33/33; 95% CI: 93–100%) for the diagnosis of AIP, 95.2% accuracy (59/62; 95% CI: 89.8–100%) and area under the curve of 0.975 (95% CI: 0.936–1.0).ConclusionsRadiomic features help differentiate AIP from PDAC with an overall accuracy of 95.2%.     

Insight towards Nucleation Mechanism and Change in Morphology for Nanostructured Platinum Thin Film Directly Grown on Carbon Substrate via Electrochemical Deposition

Nanocrystalline platinum with different morphologies is synthesized via electrochemical deposition technique. The nucleation mechanism and its structural effect over the electrodeposited Pt on carbon electrodes have been systematically studied. Powder X-ray diffraction, X-ray photoelectron spectroscopy, and field-emission scanning electron microscopy are employed to study nucleation, oxidation states, and Pt structure growth on a carbon electrode. This study reports significant development of Pt metal nanoparticles with different morphologies such as a sphere, flower, core-flower, and rod-like structure directly fabricated on carbon electrode while tuning the deposition parameters such as current density, time, temperature, pH during the deposition process. The proposed electrochemical route represents a superior fabrication procedure for large-scale electrode fabrication compared to a conventional method for preparing membrane electrode assemblies for fuel cell stacks.     

不同手术方法治疗复杂胫骨平台骨折临床疗效观察

目的探讨不同手术方法治疗复杂胫骨平台骨折临床疗效。方法选择2016年1月—2018年12月84例复杂胫骨平台骨折患者,随机分组。单侧锁定钢板内固定组选择单侧锁定钢板内固定手术,双侧切口双侧解剖钢板内固定组选择双侧切口双侧解剖钢板内固定。分析手术操作时间、手术失血、平均住院天数以及复杂胫骨平台骨折愈合时间;治疗前后患者视觉模拟评分和Rasmussen膝关节功能评分;膝关节僵硬发生率。结果双侧切口双侧解剖钢板内固定组视觉模拟评分和Rasmussen膝关节功能评分、手术操作时间、手术失血、平均住院天数以及复杂胫骨平台骨折愈合时间、膝关节僵硬发生率和单侧锁定钢板内固定组比较有优势,P<0.05。结论复杂胫骨平台骨折患者实施双侧切口双侧解剖钢板内固定可获得较好效果。     

四氯化碳两种途径亚急性实验染毒时某些肝酶指标的对比研究

本文用CCl_41.356g/kg和5.87g/kg分别对大鼠进行皮下和呼吸道静式染毒,为期8周亚急性中毒试验,研究临床常用血清肝酶指标的变化。结果发现:CCl_4除使大鼠体重增长减慢外,第1周起出现肝细胞脂变、浊肿,进而坏死、纤维增生和肝硬化;肝糖元及SHD酶活性减少或消失,G-6-P酶活性先升高后降低的病理形态和组织化学的改变。与此同时或稍后出现SGPT和SGOT活性升高,持续至第8周。停药两周,肝病理改变趋于恢复,SGPT和SGOT活性也恢复至接近正常,两肝酶与病理改变相平行。AKP酶活性第4周后才升高;ChE酶似有先升高后降低趋势,但无明显差异性;γ-GT酶变化不规则。提示CCl_4亚急性中毒时,SGPT和SGOT酶活性升高与肝损关系较密切,可作临床早期诊断指标。血清AKP和ChE酶亦一定程度反映肝损的发展情况,可供作临床观察病情发展的辅助指标。     

两厂头孢米诺钠治疗泌尿系感染成本-效果分析

目的:分析不同厂生产的头孢米诺钠治疗泌尿系感染的疗效和用药费用,从而指导临床更合理选择和应用药物。方法:将64例随机分为A组和B组各32例,分别给予静脉滴注进口的头孢米诺钠1g和国产的头孢米诺钠1g,bid,连续用药7d。结果:A组临床有效率为93.8%,B组为90.6%,两组安全性较好;A组药费为1 820.0元,B组药费为1 030.4元,B组要比A组节省789.6元。结论:在两组治疗效果无显著性差异情况下,B组治疗泌尿系感染是一种经济有效的治疗方案。     

不同类型西洋参花、叶的电镜比较观察

采用扫描电镜对单、双茎西洋参的花粉、叶进行了观察,证明两者在花粉壁的雕纹、叶表皮角质沉积纹理的超微结构上存在着明显的差异。     

优良资源植物——三颗针的质量考查研究之二

对四种同季不同产地采集的“三颗针”不同部位的四种生物碱进行了含量测定和分析,为该类药材的质量研究、生药采收、药厂选投料及开发应用等提供了科学依据。同时对该类资源的可持续利用也具有积极意义。     

不同层次护生对临床教学质量的评价

目的分析不同层次护生对临床教学质量评价的差异,以便采取有针对性的教学方法.方法护生在每个科室实习结束后,采用自行设计的临床教学评价表对每名护生进行问卷调查,然后分别从中专、大专、本科护生填写的调查表中各随机抽取30%进行分析.结果对病房教学氛围和护士长教学管理的评价,本科与中专、大专护生间比较,差异有显著性意义(均P<0.05),中专与大专护生间无差异(P>0.05);对带教老师的评价,本科与中专、大专与中专护生间均差异有显著性意义(P<0.01,P<0.05),本科与大专间无差异(P>0.05).结论不同层次护生对临床教学质量评价的侧重点不同,本科生对病房教学氛围及护士长教学管理的要求较高,大专生次之.在临床教学中应根据护生的学历层次,采取有针对性的教学方法,以便不断提高临床教学质量.     

等比分配二次混合的方法研究

目的:建立等比分配二次混合方法,并使此类混合合理化。方法:提出等比分配二次混合方法的基本构架,借助数学工具,运用推理和实验验证的方法进行方法研究。结果:建立了等比分配二次混合方法,实验证明此方法可行。结论:等比分配二次混合法是一个可用于工业化生产,既科学合理又经济可行的特殊混合方法。     

肉鸡对不同形态锰源的生物利用率研究

目的 :　研究肉仔鸡对不同形态锰源的相对生物学利用率。方法 :　将 62 4只 1日龄肉公鸡随机分为 1 3组 ,分别饲不添加锰的基础饲粮 (对照组 )或以不同锰化合物添加 60、1 2 0、1 80 mg/ kg锰的试验饲粮 2 1 d。结果 :　肉鸡生长性能各指标和腿病发生率以及肉鸡的跖骨灰锰含量、心肌细胞线粒体中 Mn SOD活性均未受到添加锰源以及锰源与锰水平互作的显著影响 ,但受到添加锰水平的显著影响。肉鸡心肌含锰量和 Mn SOD m RNA水平均未受到添加锰源与锰水平互作的显著影响 ,但受到添加锰源及添加锰水平的显著影响。其中中等和强络合强度有机锰源的生物学利用率明显高于无机硫酸锰和弱络合强度有机锰源。结论 :　中等和强络合强度的复合氨基酸锰对肉仔鸡的生物学利用率明显优于无机硫酸锰和弱络合强度的蛋氨酸锰