全文获取类型
收费全文 | 73篇 |
免费 | 1篇 |
国内免费 | 1篇 |
专业分类
妇产科学 | 1篇 |
基础医学 | 3篇 |
口腔科学 | 2篇 |
临床医学 | 12篇 |
内科学 | 10篇 |
神经病学 | 12篇 |
特种医学 | 23篇 |
外科学 | 6篇 |
预防医学 | 5篇 |
药学 | 1篇 |
出版年
2022年 | 1篇 |
2021年 | 2篇 |
2019年 | 1篇 |
2018年 | 2篇 |
2017年 | 1篇 |
2014年 | 1篇 |
2013年 | 1篇 |
2012年 | 3篇 |
2011年 | 3篇 |
2010年 | 3篇 |
2009年 | 1篇 |
2008年 | 2篇 |
2007年 | 2篇 |
2005年 | 1篇 |
2004年 | 2篇 |
2003年 | 2篇 |
2002年 | 4篇 |
2001年 | 5篇 |
2000年 | 2篇 |
1999年 | 1篇 |
1998年 | 1篇 |
1990年 | 2篇 |
1989年 | 3篇 |
1988年 | 3篇 |
1987年 | 6篇 |
1986年 | 3篇 |
1985年 | 3篇 |
1984年 | 3篇 |
1983年 | 2篇 |
1982年 | 3篇 |
1981年 | 3篇 |
1980年 | 1篇 |
1979年 | 2篇 |
排序方式: 共有75条查询结果,搜索用时 15 毫秒
1.
Respiratory motion commonly produces degradation of image quality on magnetic resonance scans of the upper abdomen due to artifacts produced in the direction of the phase encoding gradient. Such artifacts may be reduced, although not eliminated, on image sequences obtained with relatively short acquisition times by means of breath holding during the middle 20% of the sequence. 相似文献
2.
3.
4.
BACKGROUND: The Paling Perspective Scale, a means of communicating risk in various settings, has been applied to diverse fields such as nuclear power, blood banking, and ophthalmology. TECHNIQUE: Statistics of risk for various events in obstetrics and gynecology were collected from the literature and directly applied to the risk scale. EXPERIENCE: The graphic simplicity and versatility of this scale make it adaptable for communicating risks to people of different technical and educational backgrounds. CONCLUSION: The Paling Perspective Scale might help obstetrician-gynecologists obtain informed consent for surgery, genetic counseling, and other topics. 相似文献
5.
We propose a revised objective measurement of the size of the renal medullary pyramid in the assessment of the prominent renal pyramid: the medullary-renal ratio (MRR). (Formula: see text). This is a more accurate assessment of the size of the renal pyramid relative to the size of the kidney than the previously proposed medullary pyramid index, which fails to take into account the varying morphology of otherwise normal kidneys. 相似文献
6.
7.
Patterns of cerebral atrophy in dementia with Lewy bodies using voxel-based morphometry 总被引:11,自引:0,他引:11
Burton EJ Karas G Paling SM Barber R Williams ED Ballard CG McKeith IG Scheltens P Barkhof F O'Brien JT 《NeuroImage》2002,17(2):618-630
Previous cross-sectional MRI studies based on region-of-interest analyses have shown that increased cerebral atrophy is a feature of both Dementia with Lewy bodies (DLB) and Alzheimer's disease (AD). Relative preservation of the hippocampus and temporal lobe structures in DLB compared to AD has been reported in region-of-interest-based studies. Recently, image processing techniques such as voxel-based morphometry (VBM) have been developed to provide an unbiased, visually informative, and comprehensive means of studying patterns of cerebral atrophy. We report the first study to use the voxel-based approach to assess patterns of cerebral atrophy in DLB compared to control subjects and AD. Regional gray matter volume loss was observed bilaterally in the temporal and frontal lobes and insular cortex of patients with DLB compared to control subjects. Comparison of dementia groups showed preservation of the medial temporal lobe, hippocampus, and amygdala in DLB relative to AD. Significant gray matter loss was also observed in the thalamus of AD patients compared to DLB. 相似文献
8.
9.
We identified cysts in five kidneys of four patients who had lithotripsy. Three of these kidneys were evaluated with CT scans the day before and the day after lithotripsy and showed no change. The other two kidneys were studied by CT only after extracorporeal shock wave lithotripsy; hemorrhage was shown in one and cyst wall thickening in the other. 相似文献
10.