全文获取类型
收费全文 | 1838篇 |
免费 | 89篇 |
国内免费 | 10篇 |
学科分类
医药卫生 | 1937篇 |
出版年
2023年 | 8篇 |
2022年 | 5篇 |
2021年 | 35篇 |
2020年 | 20篇 |
2019年 | 24篇 |
2018年 | 36篇 |
2017年 | 22篇 |
2016年 | 33篇 |
2015年 | 63篇 |
2014年 | 71篇 |
2013年 | 68篇 |
2012年 | 82篇 |
2011年 | 97篇 |
2010年 | 94篇 |
2009年 | 85篇 |
2008年 | 87篇 |
2007年 | 93篇 |
2006年 | 110篇 |
2005年 | 85篇 |
2004年 | 106篇 |
2003年 | 68篇 |
2002年 | 62篇 |
2001年 | 36篇 |
2000年 | 46篇 |
1999年 | 45篇 |
1998年 | 43篇 |
1997年 | 53篇 |
1996年 | 55篇 |
1995年 | 39篇 |
1994年 | 31篇 |
1993年 | 14篇 |
1992年 | 17篇 |
1991年 | 12篇 |
1990年 | 18篇 |
1989年 | 21篇 |
1988年 | 20篇 |
1987年 | 13篇 |
1986年 | 19篇 |
1985年 | 18篇 |
1984年 | 18篇 |
1983年 | 7篇 |
1982年 | 8篇 |
1981年 | 8篇 |
1980年 | 6篇 |
1978年 | 7篇 |
1977年 | 8篇 |
1975年 | 3篇 |
1973年 | 2篇 |
1970年 | 2篇 |
1966年 | 2篇 |
排序方式: 共有1937条查询结果,搜索用时 546 毫秒
11.
The magnetic resonance (MR) images of six patients with thrombosis of a dural sinus were reviewed. The diagnosis had been verified by computed tomographic scans in three patients and arteriograms in two; in the sixth patient, only MR imaging was used to confirm the clinical syndrome. In all patients, high-intensity signal was seen from the thrombus within the affected dural sinus on all echoes. This persistent signal intensity allowed intravascular clot to be distinguished from normal causes of increased signal such as flow-related enhancement (entry phenomenon) and even-echo rephasing. MR imaging demonstrated the cause of the thrombosis in three patients: two were secondary to adjacent tumors, and one was secondary to unsuspected mastoiditis. Complications such as infarction were also demonstrated. Using MR imaging, one can easily and safely diagnose thrombosis of a dural sinus. MR should be the imaging method of choice in patients suspected of having thrombosis of a dural sinus. 相似文献
12.
13.
14.
15.
16.
Brandon JC; Teplick SK; Haskin PH; Sammon JK; Muhr WF; Hofmann AF; Gambescia RA; Zitomer N 《Radiology》1988,166(3):665-667
The authors describe their experience with methyl tertiary butyl ether (MTBE) in a larger series of patients than previously reported in order to acquaint physicians with both its effectiveness for dissolution of common bile duct calculi and the limitations of its use. Ten patients with 13 biliary calculi underwent percutaneous stone dissolution treatment with the experimental cholesterol solvent, MTBE. Three stones completely dissolved within 30 minutes, seven were reduced in size, and three were visibly unaffected. All stones not completely dissolved were easily extracted by means of a stone basket except for one in a patient taken to surgery. Although MTBE perfusion is an effective technique for management of biliary calculi, practitioners should be aware that its use is quite time consuming and its odor difficult to control. 相似文献
17.
18.
19.