Spectral-spatial classification of hyperspectral imagery based on recurrent neural networks

Deep neural networks have recently been successfully explored to extract deep features for hyperspectral image classification. Recurrent neural networks (RNNs) are an important branch of the deep learning family, which are widely used for sequence analysis. Indeed, RNNs have been used to model the dependencies between the different spectral bands of hyperspectral image, inspired by the observation that hyperspectral pixels can be considered as spectral sequences. A disadvantage of such methods is that they don’t consider the effect of neighborhood pixels on the final class label. In this letter, a RNN model is proposed for the spectral-spatial classification of hyperspectral image. Specifically, the hyperspectral image cube surrounding a central pixel is considered as a hyperspectral pixels sequence, and a RNN is used to model the dependencies between the different neighborhood pixels. The proposed RNN is conducted on two widely used hyperspectral image datasets. The experimental results demonstrate that the proposed approach provides a better performance than that of conventional methods.     

床头型急救车在病区急救准备中的效果观察

目的 观察自主创新研制的一款床头型急救车在急救准备中的使用效果。方法 选择泗洪县中医院呼吸内科、神经内科、胸外科、神经外科共30名护士为操作对象,采用模拟抢救考核的方式,要求她们分别采用传统的常规方法（常规法）和床头型急救车方法（改进法）完成急救准备,纪录两种方法的急救准备时间、物品准备齐全率及物品摆放合理性,并进行对比分析。结果 按常规方法,急救准备耗时（260.0±49.6）s,物品准备齐全率46.7%;使用床头型急救车方法,急救准备耗时（159.2±13.9）s,物品准备齐全率93.3%,两组比较差异均有统计学差异（P<0.01）。使用床头型急救车方法的物品摆放更为整齐、合理。结论 床头型急救车在抢救患者时可以减少抢救准备用时,提高物品准备齐全率,使物品摆放更规范安全,值得临床推广使用。     

Morphology of the ascending aorta: a study on 114 Chinese patients

Purpose: This study aimed to investigate the morphological characteristics of ascending aortic dissection in detail.Materials and Methods: The ascending aorta was morphologically assessed in a consecutive series of patients between January 2009 and October 2014. A new assessment and evaluation method was used to describe 114 patients with ascending aortic dissection.Results: A large difference was found in the degree of curvature between the ascending aorta with and without dissection. The shape of the former was straighter and steeper (control group R, 47.46 ± 6.40 mm; experimental group R, 59.70 ± 10.27 mm, P < 0.001). In the case of aortic dissection involving the valves, the proximal edge of the first entry was obviously close to the aortic sinus. The orientation of the entries was mainly around the 10 o’clock and 1–2 o’clock positions, and most of their shapes were fusiform (111; 70.02%). The distance of the distal extending dissection was associated with cases involving the branch arteries (involving three branches 441.40 ± 101.13 mm vs 159.85 ± 131.86 mm in others, P < 0.001).Conclusion: The morphological features of the ascending aorta after dissection and the correlations among dissections, entries, and related factors were found.     

Chronic restraint-induced stress has little modifying effect on radiation hematopoietic toxicity in mice

Both radiation and stresses cause detrimental effects on humans. Besides possible health effects resulting directly from radiation exposure, the nuclear plant accident is a cause of social psychological stresses. A recent study showed that chronic restraint-induced stresses (CRIS) attenuated Trp53 functions and increased carcinogenesis susceptibility of Trp53-heterozygous mice to total-body X-irradiation (TBXI), having a big impact on the academic world and a sensational effect on the public, especially the residents living in radioactively contaminated areas. It is important to investigate the possible modification effects from CRIS on radiation-induced health consequences in Trp53 wild-type (Trp53wt) animals. Prior to a carcinogenesis study, effects of TBXI on the hematopoietic system under CRIS were investigated in terms of hematological abnormality in the peripheral blood and residual damage in the bone marrow erythrocytes using a mouse restraint model. Five-week-old male Trp53wt C57BL/6J mice were restrained 6 h per day for 28 consecutive days, and TBXI (4 Gy) was given on the 8th day. Results showed that CRIS alone induced a marked decrease in the red blood cell (RBC) and the white blood cell (WBC) count, while TBXI caused significantly lower counts of RBCs, WBCs and blood platelets, and a lower concentration of hemoglobin regardless of CRIS. CRIS alone did not show any significant effect on erythrocyte proliferation and on induction of micronucleated erythrocytes, whereas TBXI markedly inhibited erythrocyte proliferation and induced a significant increase in the incidences of micronucleated erythrocytes, regardless of CRIS. These findings suggest that CRIS does not have a significant impact on radiation-induced detrimental effects on the hematopoietic system in Trp53wt mice.     

18F-PET/CT在肺磨玻璃结节诊断中的应用

目的 探讨肺恶性磨玻璃结节(ground-glass opacity, GGO)的¹⁸F-FDG PET/CT影像学特点及¹⁸F-FDG PET/CT鉴别肺GGO良恶性的诊断价值。方法 对82例行PET/CT检查的肺GGO患者的临床资料及PET/CT影像学特点行回顾分析,其中51例患者均经手术病理确诊,31例随访疗效后明确诊断。结果 82例患者中,50例为恶性病变,32例为良性病变。单因素分析显示,PET/CT下GGO的密度类型、分叶、边界、毛刺、胸膜凹陷征、充气空泡征以及标准摄取值(standardized up take value, SUV)平均值、最大值对于良恶性鉴别有意义。多因素分析显示,混合型GGO、边界不清GGO及分叶GGO是恶性GGO的预测因子。ROC曲线分析结果显示SUV最大值与平均值对于GGO的良恶性鉴别准确性较低(AUC=0.679、0.682)。结论 ¹⁸F-PET/CT对恶性GGO的诊断有良好的敏感性和特异性。     

不安腿综合征的脑影像学研究进展

不安腿综合征(RLS)的病因复杂,脑影像学技术的发展及应用为不安腿综合征的病因假说提供了新角度,特别是利用核磁共振和发射性计算机断层扫描技术对该病的脑结构、铁代谢、多巴胺能系统、阿片系统和5羟色胺系统给予数据支持.笔者就RLS脑影像学的最新研究进展进行综述.     

靶向人喉癌HEP2细胞Trop2基因的siRNA构建及鉴定

目的构建能高效干扰Trop2基因的si RNA,转染人喉癌HEP2细胞,并初步鉴定其干扰效果。方法以人Trop2基因为靶基因,设计合成3条针对不同作用位点的si RNA干扰序列,用脂质体法将各小干扰序列瞬时转染人喉癌HEP2细胞,同时设立阴性对照、空白对照,分别命名为W组(未转染组)、NC组(阴性对照组)、T1组(S1序列组)、T2组(S2序列组)及T3组(S3序列组),每组各5例。荧光显微镜下观察绿色荧光蛋白表达,计算转染效率。转染24 h后,收集稳定后细胞,采用实时荧光定量PCR法检测各干扰序列对Trop2基因表达的抑制效果。结果荧光显微镜下观察,见HEP2细胞表达绿色荧光蛋白,证实si RNA已转入细胞,转染率达90%。RT-PCR法结果显示,与未转染组、阴性对照组相比,转染si RNA的人喉癌HEP2细胞中Trop2表达均受到抑制,与T2、T3组相比,T1组对Trop2 m RNA的抑制作用最明显,差异有统计学意义(0.470±0.063 vs 0.749±0.024,0.824±0.027,P<0.05)。结论成功构建并筛选出了能高效、特异沉默人喉癌HEP2细胞Trop2基因的si RNA序列,为进一步研究Trop2基因在喉癌中的作用机制及其基因治疗奠定了基础。     

自拟参苓山蛸汤治疗脾胃虚弱型胃炎

目的 观察自拟参苓山蛸汤对脾胃虚弱型胃炎的临床疗效.方法 选取105例脾胃虚弱型胃炎患者,随机分为治疗组和对照组,治疗组60例采用自拟参苓山蛸汤(太子参、茯苓、山药、海螵蛸)治疗,对照组45例使用雷尼替丁治疗.比较2组总有效率、不良反应发生率及安全性.结果 治疗组总有效率95.0％,对照组总有效率88.9％(P＞ 0.05),治疗组显效率58.3％优于对照组17.8％ (P＜0.05).治疗组不良反应发生率3.3％,低于对照组的17.8％(P＜ 0.05).结论 自拟参苓山蛸汤治疗脾胃虚弱型胃炎,能有效改善临床症状,降低不良反应发生率.     

吉林省食源性疾病患者就诊情况及疾病经济负担的评估

目的:了解吉林省食源性疾病患者就诊和疾病经济负担情况并分析疾病经济负担的影响因素,为食源性疾病的防治提供依据。方法:以2012-2013年在吉林省内连续居住6个月及以上的常住人口为调查对象,采用多阶段分层随机抽样方法,选取吉林省10个监测地区内7 353人(2012年3 065人,2013年4 288人)进行入户面对面调查。分析不同类型食源性疾病患者的就诊率和疾病经济负担情况;采用单因素和多重线性回归分析食源性疾病经济负担的影响因素。结果:吉林省食源性疾病患者就诊率为13.10%,不同年龄、文化程度、过去4周内发生急性胃肠炎次数和患病持续天数的患者就诊率比较差异有统计学意义(P<0.05),35~44岁年龄组患者就诊率高于其他年龄组(P<0.05),大学及以上文化程度的患者就诊率高于其他文化程度者(P<0.05),过去4周内发生急性胃肠炎2次以上的患者的就诊率高于其他患者(P<0.05),患病持续4 d及以上的患者就诊率高于其他患者(P<0.05)。157例食源性疾病患者的总经济负担为5 847.82元,人均疾病经济负担为37.25元。首次就诊机构级别和患病持续天数是食源性疾病经济负担的主要影响因素。结论:食源性疾病的就诊率不高,但给患者带来一定的经济负担,应提高基层医疗机构的利用率和诊疗能力,以降低食源性疾病患者的经济负担。     

三阴性乳腺癌中CK5/6和PTEN的表达及其临床病理意义

[摘要]　目的　探讨三阴性乳腺癌组织中CK5/6和PTEN的表达及其临床病理意义。　方法　　通过免疫组化方法检测68例三阴性乳腺癌组织和22例正常乳腺组织CK5/6和PTEN的表达,分析两者的表达水平与临床病理特征及预后的关系。　结果　CK5/6在三阴性乳腺癌组织阳性率为52.9%（36/68）,明显高于正常乳腺组织9.1%（2/22）（P<0.05）。PTEN在三阴性乳腺癌组织阳性率为55.9%（38/68）,明显低于正常乳腺组织90.9%（20/22）（P<0.05）。CK5/6和PTEN表达在肿瘤直径<5 cm和≥5 cm间,淋巴结转移数目<5个和≥5个间及是否远处转移间比较,差异均有显著性意义（P<0.05）。三阴性乳腺癌CK5/6阳性组及PTEN阴性组患者的生存时间显著短于CK5/6阴性组及PTEN阳性组（P<0.05）。　结论　　三阴性乳腺癌CK5/6表达和PTEN表达缺失与肿瘤大小、淋巴结转移数目及远处转移有关,CK5/6表达和PTEN表达缺失提示患者预后不良。