全文获取类型
收费全文 | 210060篇 |
免费 | 37570篇 |
国内免费 | 5608篇 |
专业分类
耳鼻咽喉 | 6169篇 |
儿科学 | 6140篇 |
妇产科学 | 3055篇 |
基础医学 | 11678篇 |
口腔科学 | 2666篇 |
临床医学 | 33452篇 |
内科学 | 57293篇 |
皮肤病学 | 8524篇 |
神经病学 | 18409篇 |
特种医学 | 9585篇 |
外国民族医学 | 21篇 |
外科学 | 47683篇 |
综合类 | 6505篇 |
现状与发展 | 85篇 |
一般理论 | 6篇 |
预防医学 | 10277篇 |
眼科学 | 4870篇 |
药学 | 7125篇 |
38篇 | |
中国医学 | 2521篇 |
肿瘤学 | 17136篇 |
出版年
2024年 | 649篇 |
2023年 | 5474篇 |
2022年 | 3432篇 |
2021年 | 6297篇 |
2020年 | 8254篇 |
2019年 | 4319篇 |
2018年 | 9551篇 |
2017年 | 9232篇 |
2016年 | 10419篇 |
2015年 | 11355篇 |
2014年 | 18882篇 |
2013年 | 18930篇 |
2012年 | 10379篇 |
2011年 | 10615篇 |
2010年 | 13417篇 |
2009年 | 16664篇 |
2008年 | 9060篇 |
2007年 | 7248篇 |
2006年 | 9512篇 |
2005年 | 6584篇 |
2004年 | 5116篇 |
2003年 | 3901篇 |
2002年 | 3670篇 |
2001年 | 5001篇 |
2000年 | 4188篇 |
1999年 | 4414篇 |
1998年 | 4277篇 |
1997年 | 4085篇 |
1996年 | 3863篇 |
1995年 | 3646篇 |
1994年 | 2330篇 |
1993年 | 1791篇 |
1992年 | 1775篇 |
1991年 | 1718篇 |
1990年 | 1354篇 |
1989年 | 1439篇 |
1988年 | 1262篇 |
1987年 | 1057篇 |
1986年 | 1066篇 |
1985年 | 847篇 |
1984年 | 641篇 |
1983年 | 602篇 |
1982年 | 548篇 |
1981年 | 438篇 |
1980年 | 384篇 |
1979年 | 358篇 |
1978年 | 355篇 |
1977年 | 427篇 |
1975年 | 301篇 |
1972年 | 324篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
Cheong-Il Shin Sang Joon Park Ji-Hyun Kim Yeonyee Elizabeth Yoon Eun-Ah Park Bon-Kwon Koo Whal Lee 《Korean journal of radiology》2021,22(5):688
ObjectiveTo compare the lumen parameters measured by the location-adaptive threshold method (LATM), in which the inter- and intra-scan attenuation variabilities of coronary computed tomographic angiography (CCTA) were corrected, and the scan-adaptive threshold method (SATM), in which only the inter-scan variability was corrected, with the reference standard measurement by intravascular ultrasonography (IVUS).Materials and MethodsThe Hounsfield unit (HU) values of whole voxels and the centerline in each of the cross-sections of the 22 target coronary artery segments were obtained from 15 patients between March 2009 and June 2010, in addition to the corresponding voxel size. Lumen volume was calculated mathematically as the voxel volume multiplied by the number of voxels with HU within a given range, defined as the lumen for each method, and compared with the IVUS-derived reference standard. Subgroup analysis of the lumen area was performed to investigate the effect of lumen size on the studied methods. Bland-Altman plots were used to evaluate the agreement between the measurements.ResultsLumen volumes measured by SATM was significantly smaller than that measured by IVUS (mean difference, 14.6 mm3; 95% confidence interval [CI], 4.9–24.3 mm3); the lumen volumes measured by LATM and IVUS were not significantly different (mean difference, −0.7 mm3; 95% CI, −9.1–7.7 mm3). The lumen area measured by SATM was significantly smaller than that measured by LATM in the smaller lumen area group (mean of difference, 1.07 mm2; 95% CI, 0.89–1.25 mm2) but not in the larger lumen area group (mean of difference, −0.07 mm2; 95% CI, −0.22–0.08 mm2). In the smaller lumen group, the mean difference was lower in the Bland-Altman plot of IVUS and LATM (0.46 mm2; 95% CI, 0.27–0.65 mm2) than in that of IVUS and SATM (1.53 mm2; 95% CI, 1.27–1.79 mm2).ConclusionSATM underestimated the lumen parameters for computed lumen segmentation in CCTA, and this may be overcome by using LATM. 相似文献
52.
53.
Breast Elastography: How to Perform and Integrate Into a “Best-Practice” Patient Treatment Algorithm
Breast elastography has been available for more than 15 years but is not widely incorporated into clinical practice. Many publications report extremely high accuracy for various breast elastographic techniques. However, results in the literature are extremely variable. This variability is most likely due to variations in technique, a relatively steep learning curve, and variability in methods between vendors. This article describes our protocol for performing breast elastography using both strain elastography and shear wave elastography, which produces high sensitivity and specificity. Additionally, we will describe the most commonly known false-positive and false-negative lesions as well as how to detect them. 相似文献
54.
The term “oligometastatic prostate cancer” refers to a heterogeneous group of disease states currently defined solely on the basis of clinical features. Oligorecurrent disease, de novo oligometastases, and oligoprogressive disease likely have unique biologic underpinnings and natural histories. Evidence suggesting the existence of a subset of patients who harbor prostate cancer with limited metastatic potential currently includes disparate and overwhelmingly retrospective reports. Nevertheless, emerging prospective data have corroborated the “better-than-expected,” retrospectively observed outcomes, particularly in the setting of oligorecurrent prostate cancer. Improved functional imaging with prostate-specific membrane antigen-targeted strategies may enhance the identification of patients with oligometastatic prostate cancer in the short term. In the long term, refinement of the oligometastatic case definition likely will require biologic risk-stratification schemes. To determine optimal treatment strategies and identify patients most likely to benefit from metastasis-directed therapy, future efforts should focus on conducting high-quality, prospective trials with much-needed molecular correlative studies. 相似文献
55.
56.
患者女,40岁,因"咳嗽10个月余,咳绿色浓痰伴发热5 d"就诊本院。体格检查:神志清,一般情况可。2018年10月26日外院胸部CT平扫及增强(图1)示右肺上叶肺门旁直径约2.2 cm类圆形结节影,边缘光整,无毛刺及卫星灶,密度尚均匀;增强后明显强化,动脉期CT值约107 HU,静脉期CT值约89 HU,考虑为硬化性肺细胞瘤。于外院行抗炎、止咳、化痰等治疗,症状无缓解。 相似文献
57.
Yeon Seok Lee June Hyunkyung Lee Jae Eun Choi Joo Young Kim Tae Young Han 《Pediatric dermatology》2021,38(1):290-291
Erythema induratum of Bazin (EIB) is a form of tuberculid resulting from hypersensitivity to tuberculosis antigen. EIB occurs most commonly in middle‐aged women and is not typically seen in children. Here, we present a rare case of EIB, presenting as a chronic nodular panniculitis, in a 10‐year‐old Korean boy. 相似文献
58.
59.
60.
医科大学医学生健康教育培训需求度和满意度现状分析 《医学教育管理》2019,5(1):60
目的 了解医学生学习《健康教育》课程的满意度、需求度现状及差异,为《健康教育》课程优化提供参考。方法 以某医科大学在校临床医学生为研究对象,分析医学生对课程内容的需求度和满意度及二者差异。课程内容包括服药依从性、戒烟干预、合理膳食、心理压力管理、中医康复技术、慢性传染病健康教育、急性传染病健康教育、移动健康技术教育、运动康复指导及健康促进理论。采用频数和构成比指标进行统计描述,采用卡方检验进行健康教育课程学习情况与专业/ 学制之间、相关课程内容学习的需求度与学制的差异,相关课程内容学习需求度与满意度的关联比较采用秩和检验。以P < 0.05 为差异具有统计学意义。结果 戒烟干预、合理膳食、心理压力管理、中医康复技术、慢性传染病健康教育、急性传染病健康教育、移动健康技术教育及健康促进理论八项的学习需求度在长学制医学生与五年制医学生中的总体分布位置不同(U = 2.4、2.2、2.5、2.3、2.4、2.4、2.3、2.0,P 均< 0.05);服药依从性、戒烟干预、合理膳食、心理压力管理、慢性传染病健康教育、急性传染病健康教育、移动健康技术教育及运动康复指导八项的满意度与需求度之间的总体位置分布不同(U = 6.2、5.2、7.2、9.2、5.9、6.1、2.1、3.2,P 均< 0.05);不同学制的医学生对于慢性病人、老年人、孕产妇、传染病人、高危人群和职业暴露人群的健康教育重点关注人群侧重有所不同,其差异具有统计学意义(χ2 = 8.9、14.2、9.9、6.9、23.9、17.8,P 均< 0.05);在教学方式上,不同学制的医学生对于教师课堂讲授和小组讨论的偏好上的差异具有统计学意义(χ2=6.3、9.5,P 均< 0.05)。结论 当前健康教育课程的教学内容和结构未能完全满足不同学制、年级医学生的学习需求,需要对课程教学内容、教学方式和开设时间进行进一步的优化设计。 相似文献