首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   191篇
  免费   4篇
儿科学   2篇
妇产科学   3篇
基础医学   20篇
临床医学   28篇
内科学   6篇
神经病学   6篇
特种医学   85篇
外科学   20篇
预防医学   4篇
药学   12篇
肿瘤学   9篇
  2018年   2篇
  2017年   2篇
  2015年   1篇
  2013年   4篇
  2012年   5篇
  2011年   6篇
  2010年   3篇
  2009年   4篇
  2008年   4篇
  2007年   4篇
  2006年   9篇
  2005年   6篇
  2004年   8篇
  2003年   6篇
  2002年   5篇
  2001年   6篇
  2000年   8篇
  1999年   5篇
  1998年   6篇
  1997年   5篇
  1995年   2篇
  1994年   3篇
  1993年   4篇
  1992年   5篇
  1991年   5篇
  1990年   3篇
  1989年   5篇
  1988年   2篇
  1987年   5篇
  1986年   11篇
  1985年   5篇
  1984年   12篇
  1983年   6篇
  1982年   2篇
  1981年   2篇
  1980年   1篇
  1979年   6篇
  1978年   3篇
  1977年   6篇
  1976年   7篇
  1975年   1篇
排序方式: 共有195条查询结果,搜索用时 15 毫秒
1.
Haaga  JR; Beale  SM 《Radiology》1986,161(3):829-830
By injecting small amounts of CO2 through a needle, one can move bowel or bladder from the intended path of instruments during interventional procedures. The technique worked well in six of seven cases in the pelvis and retroperitoneum; it was not effective in the mediastinum or midabdomen (n = 6).  相似文献   
2.
We describe the use of percutaneous CT guidance for localization and placement of 192Ir sources into a patient with pancreatic carcinoma. We have shown the feasibility of this procedure and the lack of complications which are probably due to minimal damage to tissue involved. Computed tomography is ideally suited for percutaneous implantation because it provides the most accurate method for needle placement within the abdomen.  相似文献   
3.
We examined two recently developed measures of positive automatic thought, the Positive Automatic Thoughts Questionnaire (ATQ-P) and the Automatic Thoughts Questionnaire—Revised (ATQ-RP). Internal consistency, concurrent validity, and convergent and discriminant validity were addressed. Two hundred one undergraduates completed self-report measures of positive automatic thoughts, negative automatic thoughts, depressive symptoms, anxiety symptoms, and positive affectivity. The ATQ-P and ATQ-RP both showed high internal consistency, strong negative associations with depressive symptoms, specificity to depressive symptoms rather than anxiety symptoms, an average state-of-mind (SOM) ratio in the positive dialogue range, and a stronger relation with each other than with a measure of positive affectivity. The only notable difference between the measures was a significantly lower mean score (correcting for number of items) on the ATQ-RP. This paper is based on a thesis completed by the first author, under the supervision of the second author, in partial fulfillment of the requirements for the Master of Arts degree at American University. We are grateful to thesis committee members Lorah Dorn and Jim Gray for feedback on this material.  相似文献   
4.
The purpose of this study was to determine the suitability of MRI to accurately detect radiofrequency (RF) thermoablative lesions created under MR guidance. In vivo RF lesions were created in the livers of six New Zealand White rabbits using a 2-mm-diameter titanium alloy RF electrode with a 20-mm exposed tip and a 50-W RF generator. This was performed using a 0.2T clinical C-arm MR imager for guidance and monitoring. Each animal was sacrificed and gross evaluation was performed. Histologic correlation was performed on the first two animals. The MR-compatible RF electrode was easily identified on rapid gradient-echo images used to guide electrode placement. A single lesion was created in each rabbit liver. Lesions ranged from approximately 10 to 17 mm in diameter (mean, 13.5 mm). T2-weighted and short T1 inversion recovery (STIR) images demonstrated lesions ranging in diameter from 12 to 18 mm (mean, 14.6 mm). Lesion dimensions determined from images closely correlated with those determined at gross examination with the discrepancy never exceeding 2 mm, for an r2 value of .87. MRI performed at the time of MR-guided RF ablation accurately demonstrated created lesions. This modality may provide a new option for the treatment of local and regional neoplastic disease.  相似文献   
5.
Imaging-guided microsurgery and the future of radiology   总被引:2,自引:0,他引:2  
  相似文献   
6.
7.
In this article, the author discusses his experience with a 0.30-T superconducting magnet for evaluation of the liver. This discussion includes evaluation of malignant and benign disease and comparison of MRI with CT scanning.  相似文献   
8.
A total of 8 patients between 2 days and 2 years old underwent 13 percutaneous nephrostomies for treatment of hydronephrosis. No significant complications were encountered.  相似文献   
9.
Computed tomography of the pancreas   总被引:2,自引:0,他引:2  
  相似文献   
10.
Haaga JR 《European radiology》2005,15(Z4):D116-D120
CT-guided procedures remain an important tool for diagnosis and tissue acquisition for primary diagnosis and molecular/tissue correlation. New imaging devices such as MDCT and PET/CT will improve diagnosis but percutaneous procedures will be needed to confirm and support new molecular and DNA treatments. Coagulopathic patients can be treated with LIBE a new method to prevent bleeding. Vasoactive drugs can be used to improve differentiation of malignant and benign diseases.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号