全文获取类型
收费全文 | 243410篇 |
免费 | 20775篇 |
国内免费 | 14393篇 |
专业分类
耳鼻咽喉 | 2183篇 |
儿科学 | 3045篇 |
妇产科学 | 4912篇 |
基础医学 | 28393篇 |
口腔科学 | 4224篇 |
临床医学 | 31130篇 |
内科学 | 39964篇 |
皮肤病学 | 2836篇 |
神经病学 | 13567篇 |
特种医学 | 8578篇 |
外国民族医学 | 104篇 |
外科学 | 26816篇 |
综合类 | 34430篇 |
现状与发展 | 48篇 |
一般理论 | 45篇 |
预防医学 | 15180篇 |
眼科学 | 6687篇 |
药学 | 24387篇 |
170篇 | |
中国医学 | 11034篇 |
肿瘤学 | 20845篇 |
出版年
2024年 | 709篇 |
2023年 | 3528篇 |
2022年 | 8796篇 |
2021年 | 11526篇 |
2020年 | 8508篇 |
2019年 | 7611篇 |
2018年 | 8058篇 |
2017年 | 7060篇 |
2016年 | 6734篇 |
2015年 | 10175篇 |
2014年 | 12809篇 |
2013年 | 11976篇 |
2012年 | 17637篇 |
2011年 | 19318篇 |
2010年 | 11810篇 |
2009年 | 9437篇 |
2008年 | 12823篇 |
2007年 | 12853篇 |
2006年 | 12427篇 |
2005年 | 12477篇 |
2004年 | 8621篇 |
2003年 | 7655篇 |
2002年 | 6637篇 |
2001年 | 6002篇 |
2000年 | 6121篇 |
1999年 | 6430篇 |
1998年 | 3662篇 |
1997年 | 3686篇 |
1996年 | 2797篇 |
1995年 | 2587篇 |
1994年 | 2242篇 |
1993年 | 1500篇 |
1992年 | 2300篇 |
1991年 | 1998篇 |
1990年 | 1667篇 |
1989年 | 1458篇 |
1988年 | 1269篇 |
1987年 | 1177篇 |
1986年 | 946篇 |
1985年 | 749篇 |
1984年 | 492篇 |
1983年 | 381篇 |
1982年 | 225篇 |
1981年 | 201篇 |
1980年 | 191篇 |
1979年 | 243篇 |
1978年 | 141篇 |
1977年 | 112篇 |
1976年 | 97篇 |
1974年 | 116篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
用Multiquadric方法实现医学图像的弹性配准 总被引:3,自引:1,他引:2
目的改进医学图像弹性配准的精确度和配准方法的稳定性,并简化配准操作。方法 利用Multiquadric插值方法的可平滑性质,将其与一种半自动标记点选择方法结合。建立一种新配准方法。结果 运用此方法进行医学图像的弹性配准,实现了标准图像与变形图像的快速,准确配准,结论 我们建立的配准方法是一种准确。简便和稳定的方法。 相似文献
992.
Region of interest issues: the relationship between structure and function in the brain 总被引:2,自引:0,他引:2
J C Mazziotta C C Pelizzari G T Chen F L Bookstein D Valentino 《Journal of cerebral blood flow and metabolism》1991,11(2):A51-A56
The comparison of data sets from individual subjects between imaging modalities is necessary in order to evaluate the normal physiologic responses of the brain or the pathophysiological changes that accompany disease states. Similarly, it is critical to compare data between individuals both within and across imaging modalities. In a collaborative project with a number of university groups, we have developed a system that allows for the within-subject alignment and registration of three-dimensional data sets obtained from different modalities for the same individuals. These data make use of proposed criteria for the optimal solution to positron emission tomography image acquisition and analysis originally established through a series of international workshops. The analysis takes into account errors induced by image acquisition, registration, and alignment with regard to scaling, translation, and rotation. Using the principles of morphometrics and homologous landmarks, the between-subject warping of individual brain anatomy to match that of other individuals, groups or an idealized model can be obtained. Resultant information can provide averaged between-subject data for populations of normal individuals or patients with specific neurologic disorders. Such a system, provides the means by which to compare objectively quantitative data between individuals in a highly automated fashion. 相似文献
993.
经内镜注射5%鱼肝油酸钠治疗食管静脉曲张15例,共注射45次。其肝功能按Child分级,A级1例,B级8例,C级6例。曾经作过脾切除,分流或断流术者7例。8例急症出血患者经用硬化疗法获得了止血成功。1例急症患者死亡。6例作了择期预防出血的注射,治疗后均得到改善。治疗出血方面,硬化疗法在15例患者中14例有效,随访6~12月无再出血。 相似文献
994.
995.
陈潜 《中国医学文摘:外科学分册英文版》2007,16(2):141-142
Objective To compare the clinical efficacy and complications of transurethral resection of the prostate (TURP),transurethral vapor-resection of the prostate (TUVP) and plasmakinetic energy transurethral resection of the prostate (PKRP) for benign prostatic hypertrophy (BPH).Methods A total of 545 patients with BPH were enrolled from December 1999 to Januare 2004. 相似文献
996.
Yao-Chung Chuang Tsu-Kung Lin Chun-Chung Lui Shang-Der Chen Chen-Sheng Chang 《Seizure》2004,13(3):179-182
We report a 41-year-old woman with complex reflex epilepsy in which seizures were induced exclusively by the act of tooth brushing. All the attacks occurred with a specific sensation of sexual arousal and orgasm-like euphoria that were followed by a period of impairment of consciousness. Ictal EEG demonstrated two events of epileptic seizure that were provoked after tooth brushing for 38 and 14 seconds, respectively. The interictal EEG showed epileptiform discharges over the right anterior temporal region and interictal single photon emission computed tomography (SPECT) scan showed relative hypoperfusion in the uncus of right temporal lobe. Brain magnetic resonance imaging (MRI) revealed right hippocampal atrophy. We suggest that tooth-brushing epilepsy, especially with sexual ictal manifestations, may provide insight into the cerebral pathophysiology at the right temporolimbic structure. 相似文献
997.
寒冷干燥地区平时火器伤的早期处理 总被引:3,自引:3,他引:0
目的 探讨寒冷干燥地区平时火器伤伤情特点与早期救治方法。方法 对 1991年 1月— 2 0 0 2年 12月间 40例火器伤病人的临床救治进行回顾分析。结果 2 4例枪伤中 ,2 0例一期缝合伤口 ,均一期愈合 ,另外 4例只清创未一期缝合的伤口 ,3例愈合 ,1例感染 ;4例骨折内固定均愈合良好 ,无骨髓炎发生。 16例炸伤病人局部软组织损伤及污染比枪弹伤重 ,14例一期缝合伤口中 ,10例一期愈合 ,4例感染 ,骨折内固定 2例 ,均愈合良好 ,无骨髓炎发生。结论 寒冷干燥地区火器伤早期伤道清创时限可适当延长 ,在平时火器伤的救治中 ,对软组织条件较好的创面 ,早期清创后可一期闭合伤口和骨折内固定 ,这样可减少感染和伤残 ,促进康复 相似文献
998.
999.
Amy Y. Chen MD MPH Nicole Schrag MSPH Yongping Hao PhD W. Dana Flanders MD DSc James Kepner PhD Andrew Stewart MS Elizabeth Ward PhD 《Otolaryngology--head and neck surgery》2006,135(6):831-837
OBJECTIVE: In 1991, a randomized study was published and demonstrated that use of nonsurgical therapy (chemoradiation) provided similar survival to total laryngectomy (the gold standard) for patients with advanced-stage laryngeal cancer. The purpose of this study was to assess how treatment of advanced laryngeal cancer was influenced by such developments in non-surgical therapy. STUDY DESIGN: Patterns of care study using National Cancer Database (1985-2001). RESULTS: The percentage of advanced-stage patients treated with chemoradiation increased from 8.3% to 20.8% while the proportion treated with radiation alone decreased from 38.9% to 23.0%. Use of chemoradiation increased at a significantly faster rate after the 1991 publication at both community cancer centers and teaching research facilities. The use of total laryngectomy decreased slightly during this period. CONCLUSIONS: The use of chemoradiation increased after the 1991 publication. It was impossible to determine from the NCDB whether additional patients who could benefit from chemo-RT were not offered or did not complete this treatment option. We recommend that treatment recommendations discussed at tumor boards be recorded in cancer registries. 相似文献
1000.
George M Brinson Douglas A Chen Moisés A Arriaga 《Otolaryngology--head and neck surgery》2007,136(3):415-421
OBJECTIVE: This study compares the efficacy of endolymphatic mastoid shunt (EMS) versus endolymphatic sac decompression (ESD) without sac incision for the treatment of Ménière's disease. STUDY DESIGN AND SETTING: The AAO-HNS Guidelines for the Diagnosis and Evaluation of Therapy in Ménière's disease were used to retrospectively identify suitable candidates for the study. All patients who failed medical management and underwent either endolymphatic-mastoid shunt (EMS) (n = 88) or endolymphatic sac decompression (ESD) (n = 108) were selected for review using the AAO-HNS guidelines. The study was carried out at a tertiary care neurotology private practice. RESULTS: EMS and ESD were equally effective in reducing the incidence and severity of vertigo attacks with significant improvement in 67 percent and 66 percent of patients, respectively. CONCLUSION: Both EMS and ESD are effective, nondestructive alternatives for patients who have failed medical management of Ménière's disease with similar long-term hearing outcomes. SIGNIFICANCE: This is the only study within the same institution using AAO-HNS guidelines comparing EMS versus ESD. 相似文献