全文获取类型
收费全文 | 1160篇 |
免费 | 152篇 |
国内免费 | 9篇 |
专业分类
耳鼻咽喉 | 4篇 |
儿科学 | 22篇 |
妇产科学 | 15篇 |
基础医学 | 212篇 |
口腔科学 | 5篇 |
临床医学 | 142篇 |
内科学 | 275篇 |
皮肤病学 | 15篇 |
神经病学 | 36篇 |
特种医学 | 129篇 |
外科学 | 79篇 |
综合类 | 39篇 |
预防医学 | 47篇 |
眼科学 | 9篇 |
药学 | 41篇 |
中国医学 | 3篇 |
肿瘤学 | 248篇 |
出版年
2024年 | 3篇 |
2023年 | 3篇 |
2022年 | 5篇 |
2021年 | 25篇 |
2020年 | 16篇 |
2019年 | 24篇 |
2018年 | 34篇 |
2017年 | 24篇 |
2016年 | 30篇 |
2015年 | 24篇 |
2014年 | 35篇 |
2013年 | 37篇 |
2012年 | 27篇 |
2011年 | 49篇 |
2010年 | 30篇 |
2009年 | 37篇 |
2008年 | 49篇 |
2007年 | 46篇 |
2006年 | 43篇 |
2005年 | 49篇 |
2004年 | 65篇 |
2003年 | 49篇 |
2002年 | 66篇 |
2001年 | 48篇 |
2000年 | 41篇 |
1999年 | 45篇 |
1998年 | 47篇 |
1997年 | 21篇 |
1996年 | 20篇 |
1995年 | 21篇 |
1994年 | 28篇 |
1993年 | 23篇 |
1992年 | 29篇 |
1991年 | 19篇 |
1990年 | 20篇 |
1989年 | 32篇 |
1988年 | 22篇 |
1987年 | 16篇 |
1986年 | 21篇 |
1985年 | 13篇 |
1984年 | 12篇 |
1983年 | 11篇 |
1982年 | 12篇 |
1981年 | 7篇 |
1980年 | 7篇 |
1979年 | 7篇 |
1978年 | 10篇 |
1975年 | 4篇 |
1974年 | 3篇 |
1970年 | 2篇 |
排序方式: 共有1321条查询结果,搜索用时 31 毫秒
1.
Raffaella Marcheselli Alessia Bari Tamar Tadmor Luigi Marcheselli Maria Christina Cox Robel Papotti Angela Ferrari Luca Baldini Paolo Gobbi Ilana Levy Giuseppe Pugliese Massimo Federico Aaron Polliack Samantha Pozzi Stefano Sacchi 《Hematological oncology》2020,38(4):439-445
The main purpose of this study was to assess whether it is possible to improve the prognostic impact of international prognostic index (IPI) score by combining it with peripheral blood counts. Thus, we evaluated the prognostic power of lymphocyte, neutrophil, and monocyte counts in 520 patients with diffuse large B cell lymphoma treated with R-CHOP, confirming that these parameters have a strong impact on overall survival (OS). Using revised IPI (R-IPI), 44% of patients were categorized as poor-risk and showed an OS at 5 years of 46%. As OS at 5 years of the 520 patients is 67%, it is clearly evident that R-IPI tends to overestimate the proportion of patients with poor prognosis. Accordingly, in an attempt to improve the discriminating power of R-IPI, we evaluated and compared three different scores by combining the neutrophil lymphocyte ratio (NLR) and absolute monocyte count (AMC) with the following values: (a) IPI score 3-5, (b) age > 60 years and performance status, (c) age ≥ 65 years and LDH > ULN. The three indexes studied, had a similar 5 years OS for the high-risk group (46%-52%), but the proportion of patients classified as poor-risk were 37%, 20%, and 32%, respectively, which are lower than 44% identified with R-IPI. Thus, while R-IPI overestimates the number of high-risk patients, after applying our models, it is possible to recognize patients who are truly at high-risk. Of the three scores, the most accurate appears to be that based on NLR, AMC, LDH > ULN and age ≥ 65 years, which identifies 32% of high-risk patients, correlating well with what is seen in clinical practice. 相似文献
2.
3.
4.
Intratemporal vascular tumors: detection with CT and MR imaging 总被引:1,自引:0,他引:1
Lo WW; Shelton C; Waluch V; Solti-Bohman LG; Carberry JN; Brackmann DE; Wade CT 《Radiology》1989,171(2):445-448
The diagnostic contributions of computed tomography (CT) and magnetic resonance (MR) imaging were compared in 12 patients with benign intratemporal vascular tumors (hemangioma or vascular malformation). The tumors included six in the internal acoustic canal and six in the geniculate ganglion region. Clinical and histologic correlations were made. Two of the six patients with tumors in the internal acoustic canal underwent CT, and both required gas cisternography to show the tumor. Five patients in that group underwent MR imaging, and all five studies showed the tumor. All six patients with geniculate ganglion tumors underwent CT. Results in one study were questionable, and five showed the tumor. Five patients in this group underwent MR imaging, but the MR findings were positive in only two cases. MR imaging should therefore be performed before CT in the evaluation of facial nerve dysfunction, as it demonstrated all tumors in the internal acoustic canal and some in the geniculate ganglion region. If MR findings are negative, CT should then be performed to rule out a possible geniculate ganglion lesion. 相似文献
5.
目的:评价螺旋CT在诊断肺动脉栓塞中的作用。方法:16例肺动脉栓塞患者行螺旋CT肺动脉造影 (SCTA)检查,层厚3mm,扫描时间0.8s,对比剂注射速度3.5ml/s,总量100ml,扫描延迟时间15s。结果:16例 共644支,其中134支肺动脉及分支显示了栓塞,占20.8%。228支肺段肺动脉中,有56支显示肺动脉栓塞,占分 析肺动脉支的24.5%。204支亚段肺动脉中37支显示肺动脉栓塞,占分析肺动脉支15.4%。肺动脉栓塞的CT形 态:①直接征象为不同程度的肺动脉分支内充盈缺损。中心型充盈缺损17支,偏心型充盈缺损44支,附壁血栓型 34支,完全阻塞型39支。②间接征象胸膜下肺梗死灶,内乳动脉一侧增粗,肺纹理稀少,胸水,肺动脉高压。结论: 螺旋CT肺动脉造影是诊断肺动脉栓塞的快速、有效、无创伤的诊断方法。 相似文献
6.
7.
8.
骨巨细胞瘤的MRI诊断价值 总被引:10,自引:0,他引:10
目的探讨骨巨细胞瘤的MRI表现特点及其病理基础。资料与方法搜集经手术病理证实的12例骨巨细胞瘤患者资料,分析其MRI征象并与病理结果对照。结果T1WI上肿瘤实体表现为低、等信号,T2WI上为不均匀高信号,Gd-DTPA增强扫描呈中度到明显强化。此外,MRI还可显示肿瘤内坏死、出血、含铁血黄素沉着等。结论MRI能够提供比较全面的影像学信息,可提高对骨巨细胞瘤诊断的准确性。 相似文献
9.
10.