全文获取类型
收费全文 | 19658篇 |
免费 | 2061篇 |
国内免费 | 310篇 |
专业分类
耳鼻咽喉 | 299篇 |
儿科学 | 231篇 |
妇产科学 | 286篇 |
基础医学 | 922篇 |
口腔科学 | 534篇 |
临床医学 | 1450篇 |
内科学 | 887篇 |
皮肤病学 | 117篇 |
神经病学 | 266篇 |
特种医学 | 1093篇 |
外国民族医学 | 47篇 |
外科学 | 2127篇 |
综合类 | 2270篇 |
预防医学 | 653篇 |
眼科学 | 145篇 |
药学 | 653篇 |
9篇 | |
中国医学 | 203篇 |
肿瘤学 | 9837篇 |
出版年
2024年 | 7篇 |
2023年 | 323篇 |
2022年 | 541篇 |
2021年 | 844篇 |
2020年 | 863篇 |
2019年 | 719篇 |
2018年 | 705篇 |
2017年 | 766篇 |
2016年 | 836篇 |
2015年 | 723篇 |
2014年 | 1326篇 |
2013年 | 1273篇 |
2012年 | 1248篇 |
2011年 | 1395篇 |
2010年 | 1221篇 |
2009年 | 1116篇 |
2008年 | 977篇 |
2007年 | 1132篇 |
2006年 | 1024篇 |
2005年 | 843篇 |
2004年 | 701篇 |
2003年 | 563篇 |
2002年 | 450篇 |
2001年 | 415篇 |
2000年 | 332篇 |
1999年 | 279篇 |
1998年 | 220篇 |
1997年 | 162篇 |
1996年 | 144篇 |
1995年 | 129篇 |
1994年 | 112篇 |
1993年 | 87篇 |
1992年 | 77篇 |
1991年 | 62篇 |
1990年 | 40篇 |
1989年 | 39篇 |
1988年 | 50篇 |
1987年 | 32篇 |
1986年 | 22篇 |
1985年 | 47篇 |
1984年 | 31篇 |
1983年 | 30篇 |
1982年 | 31篇 |
1981年 | 21篇 |
1980年 | 20篇 |
1979年 | 13篇 |
1978年 | 11篇 |
1977年 | 15篇 |
1976年 | 6篇 |
1975年 | 4篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
目的:分析子野个数限值对宫颈癌固定野调强放疗(fixed-field intensity-modulated radiotherapy,ff-IMRT)计划的影响,寻求最优的子野个数限值。方法:选取10例接受ff-IMRT的宫颈癌患者,基于Monaco 5.11.03计划系统,以45 Gy/25 f处方剂量分别对同一患者设计8种ff-IMRT计划(ff-IMRT计划依据子野个数限值命名,子野个数限值分别为40、60、70、80、100、120、130、150),采用SPSS 20.0软件比较除plan100之外7个ff-IMRT计划与plan100剂量学参数、优化时间和治疗参数的差异。结果:8种ff-IMRT计划归一化后,plan40和plan60的D2%、Dmin、CI和HI均劣于plan100(P<0.05)。8种ff-IMRT计划均能较好保护危及器官(organ at risk,OAR)和正常组织。plan40小肠V45;plan40和plan60小肠D2cc,直肠、膀胱V45、D40%,两侧股骨头V40和正常组织 V35、V40均高于plan100(P<0.05)。plan40和plan60优化时间、治疗参数均优于plan100(P<0.05);plan120、plan130和plan150子野面积、子野个数(51~150 cm2和>150 cm2)和出束时间均劣于plan100(P<0.05)。结论:子野个数限值为70~100时,ff-IMRT计划能兼顾剂量学参数满足临床要求、优化时间和治疗参数最优化,建议在设计宫颈癌ff-IMRT计划时在该范围内设置子野个数限值。 相似文献
2.
BackgroundGiven numerous publications and clinical trials regarding axillary management in breast cancer, we sought to summarize this complex literature to help clarify this field for clinicians. This systematic review focuses on the role of irradiation of the axillary nodes (locoregional nodal irradiation [LRNI]) in the management of the axilla in patients with early-stage breast cancer in various clinical settings.MethodsWe searched MEDLINE and EMBASE databases, the Cochrane library, the proceedings of the ASCO, the ASTRO, the ESMO, the ESTRO, and the San Antonio Breast Cancer Symposium (2016–2019) meetings. The quality of the studies was assessed with design-specific tools. The study was registered in PROSPERO.ResultsWe included one systematic review, one individual patient data (IPD) meta-analysis, and five randomized controlled trials (RCTs). After axillary lymph node dissection (ALND), LRNI resulted in small benefits in breast cancer specific mortality, locoregional recurrence, and distant metastases-free survival but not overall survival. After a positive sentinel node biopsy (SLNB), LRNI may provide equivalent locoregional control and disease-free survival (DFS) compared to ALND with a lower risk of lymphedema. No randomized data is available for the neoadjuvant setting.ConclusionsThe summary of the role of radiation, is relevant to radiation oncologists for choosing the correct cohort of patient requiring LRNI and to surgeons making clinical decisions regarding the timing and type of breast reconstruction offered to patients. 相似文献
3.
Biniam Kidane MD MSc Ian J. Gerard MD PhD Jonathan Spicer MD PhD Julian O. Kim MD MSc BEng Pierre O. Fiset MD PhD Paul Wawryko MD Matthew J. Cecchini MD PhD Richard Inculet MD Bassam Abdulkarim MD PhD Dalilah Fortin MD Mehdi Qiabi MD MSc Gefei Qing MD Stephanie Enns BSc Bashir Bashir MBBS James Tankel MD Elliot Wakeam MD Andrew Warner MSc Neil Kopek MD Brian P. Yaremko MD MSc PEng George B. Rodrigues MD PhD Joanna M. Laba MD Melody Qu MD MPH Richard A. Malthaner MD MSc David A. Palma MD PhD 《Cancer》2023,129(18):2798-2807
Background
During coronavirus disease 2019 (COVID-19)–related operating room closures, some multidisciplinary thoracic oncology teams adopted a paradigm of stereotactic ablative radiotherapy (SABR) as a bridge to surgery, an approach called SABR-BRIDGE. This study presents the preliminary surgical and pathological results.Methods
Eligible participants from four institutions (three in Canada and one in the United States) had early-stage presumed or biopsy-proven lung malignancy that would normally be surgically resected. SABR was delivered using standard institutional guidelines, with surgery >3 months following SABR with standardized pathologic assessment. Pathological complete response (pCR) was defined as absence of viable cancer. Major pathologic response (MPR) was defined as ≤10% viable tissue.Results
Seventy-two patients underwent SABR. Most common SABR regimens were 34 Gy/1 (29%, n = 21), 48 Gy/3–4 (26%, n = 19), and 50/55 Gy/5 (22%, n = 16). SABR was well-tolerated, with one grade 5 toxicity (death 10 days after SABR with COVID-19) and five grade 2–3 toxicities. Following SABR, 26 patients underwent resection thus far (13 pending surgery). Median time-to-surgery was 4.5 months post-SABR (range, 2–17.5 months). Surgery was reported as being more difficult because of SABR in 38% (n = 10) of cases. Thirteen patients (50%) had pCR and 19 (73%) had MPR. Rates of pCR trended higher in patients operated on at earlier time points (75% if within 3 months, 50% if 3–6 months, and 33% if ≥6 months; p = .069). In the exploratory best-case scenario analysis, pCR rate does not exceed 82%.Conclusions
The SABR-BRIDGE approach allowed for delivery of treatment during a period of operating room closure and was well-tolerated. Even in the best-case scenario, pCR rate does not exceed 82%. 相似文献4.
目的 通过三维CT血管成像(CTA)评估分析直肠癌患者肠系膜下动脉(IMA)分型及解剖特点,为直肠癌手术血管处理提供参考。 方法 回顾分析2018年1月至2019年12月华中科技大学同济医学院附属协和医院接受IMA CTA检查的直肠癌患者临床及影像学资料。通过三维CT血管成像重建IMA图像。对IMA进行分类并测量统计肠系膜下血管各解剖参数。 结果 266例研究对象中男性187例,女性79例。111例(41.7%)左结肠动脉(LCA)从主干独立发出,112例(42.1%)LCA和乙状结肠动脉(SA)共干发出,33例(12.4%)LCA、SA及直肠上动脉(SRA)共干,10例(3.8%)缺乏LCA。全组IMA主干长度(LIMA)为(39.1±10.1)mm、IMA根部至髂血管分叉距离(DIMA)为(44.1±7.4)mm、IMA根部与肠系膜下静脉(IMV)水平距离为(24.6±8.9)mm、IMA分支点与IMV水平距离为(13.0±5.3)mm。LCA走行包括:122例(47.6%)高位型,88例(34.4%)中位型,46例(18.0%)低位型。65例(25.4%)LCA紧贴IMV内侧,136例(53.1%)LCA紧贴IMV外侧,55例(21.5%)LCA外侧远离IMV。 结论 术前利用三维CT血管成像可准确评估IMA分型及肠系膜下血管的形态走行关系,为直肠癌手术中血管处理提供指导。 相似文献
5.
《Cancer radiothérapie》2022,26(3):502-516
The aim of the review was to present the current literature status about replanning regarding anatomical and dosimetric changes in the target and OARs in the head and neck region during radiotherapy, to discuss and to analyze factors influencing the decision for adaptive radiotherapy of head and neck cancer patients. Significant progress has been made in head and neck patients’ evaluation and qualification for adapted radiotherapy over the past ten years. Many factors leading to anatomical and dosimetric changes during treatment have been identified. Based on the literature, the most common factors triggering re-plan are weight loss, tumor and nodal changes, and parotid glands shrinkage. The fluctuations in dose distribution in the clinical area are significant predictive factors for patients’ quality of life and the possibility of recovery. It has been shown that re-planning influence clinical outcomes: local control, disease free survival and overall survival. Regarding literature studies, it seems that adaptive radiotherapy would be the most beneficial for tumors of immense volume or those in the nearest proximity of the OARs. All researchers agree that the timing of re-planning is a crucial challenge, and there are still no clear consensus guidelines for time or criteria of re-planning. Nowadays, thanks to significant technological progress, the decision is mostly made based on observation and supported with IGRT verification. Although further research is still needed, adaptive strategies are evolving and now became the state of the art of modern radiotherapy. 相似文献
6.
7.
目的 在肺癌微波消融治疗中探究基于CT的三维数字化导航技术的应用价值。方法 回顾性分析我院收治的92例肺癌患者,随机进行三维数字化导航微波消融或传统CT引导下微波消融,分为三维导航组和传统组,依据肿瘤位置、大小(最大径差值≤2 mm)及微波消融条件不同两两配对,共46对,比较2组手术时间、微波针穿刺次数、CT剂量指数、术中并发症发生率、术后病灶控制情况。结果 三维导航组与传统组的手术时间分别为(30.07 ± 6.36)min、(47.20 ± 9.65)min、穿刺次数分别为(1.72 ± 0.69)次、(7.13 ± 3.00)次、CT剂量指数分别为(11.16 ± 2.20)mGy、(26.67 ± 8.72)mGy、术中并发症发生率分别为10.87%、34.78%,以上3个指标三维导航组均低于传统组,三维导航组治疗有效率(93.48%)高于传统组(71.74%),差异均有统计学意义(P < 0.05)。结论 CT引导下利用三维数字化导航技术行肺癌微波消融治疗,使介入穿刺手术的操作更加精准安全。 相似文献
8.
《中国整形与重建外科(英文)》2022,4(4):182-186
Dermatofibromas are benign soft tissue tumors that predominantly affect the limbs, and more rarely the chest. Keloidal dermatofibroma is a rare subtype with distinct clinicopathological features and an aggressive clinical course. By researching the evolution of the disease in this study, we aimed to summarize our experience of managing a rare patient who underwent five surgeries for keloidal dermatofibroma that developed sequentially in the upper arm and chest and propose a novel treatment for keloidal dermatofibroma. We concluded that keloidal dermatofibroma involving larger areas, high tension sites, and multiple localizations can be treated using the principles of pathological scar management. 相似文献
9.
目的分析三维重建指导胸腔镜肺段切除术诊治磨玻璃结节(GGN)的效果。 方法回顾性分析2020年10月至2021年6月于北京大学国际医院接受三维重建指导胸腔镜肺段切除术9例GGN患者临床资料。 结果9例患者均顺利完成三维重建指导胸腔镜肺段切除术,其中,右肺上叶2例,右肺下叶1例,左肺上叶5例,左肺下叶1例,无中转开胸,R0切除率为100%。手术时间(377.89±115.96)min,术中出血为(150.00±96.82)ml。术后最高视觉模拟评分法(VAS)评分为(3.67±0.71)分,术后引流时间(6.33±2.39)d,术后引流总量(1 278.89±511.23)ml,术后住院时间(8.78±2.68)d。术后引流时间>7 d者1例(11.11%),拔管延迟原因为肺漏气。9例患者均出现术后并发症,其中,1级4例,2级5例,无3~5级严重并发症或围术期死亡。清扫淋巴结3~6组[(4.89±1.05)组],清扫淋巴结11~20个[(14.00±2.73)个]。 结论三维重建指导胸腔镜肺段切除术诊治GGN安全有效。 相似文献
10.
目的探讨老年鼻咽癌患者营养风险指数对同期放化疗临床预后的影响,为制订针对性干预营养策略提供参考。方法采用回顾性研究方法,选取2006年11月至2020年11月在广东省某三级甲等肿瘤医院行同期放化疗的老年鼻咽癌患者269例为研究对象,分析营养风险指数与患者临床资料间的关系,并进行多因素生存分析。结果269例老年鼻咽癌患者放化疗前后各项营养指标较比较均下降(均P<0.01)。多因素分析结果显示,高营养风险是影响老年鼻咽癌患者预后的独立危险因素(HR=2.247,P<0.05),高分期鼻咽癌是老年营养风险指数降低的独立危险因素(HR=0.449,P<0.05)。结论老年营养风险指数适用于老年鼻咽癌同时期放化疗患者营养状况评估,高营养风险可作为预测老年鼻咽癌患者临床预后差指标。临床医护人员应及早采取营养干预措施来改善患者的营养状况及预后。 相似文献