全文获取类型
收费全文 | 454篇 |
免费 | 19篇 |
国内免费 | 2篇 |
专业分类
耳鼻咽喉 | 1篇 |
儿科学 | 5篇 |
妇产科学 | 2篇 |
基础医学 | 22篇 |
口腔科学 | 2篇 |
临床医学 | 36篇 |
内科学 | 61篇 |
皮肤病学 | 5篇 |
神经病学 | 13篇 |
特种医学 | 124篇 |
外科学 | 41篇 |
综合类 | 124篇 |
预防医学 | 6篇 |
眼科学 | 5篇 |
药学 | 10篇 |
肿瘤学 | 18篇 |
出版年
2022年 | 7篇 |
2021年 | 9篇 |
2020年 | 2篇 |
2018年 | 3篇 |
2017年 | 2篇 |
2016年 | 1篇 |
2015年 | 10篇 |
2014年 | 9篇 |
2013年 | 8篇 |
2012年 | 14篇 |
2011年 | 17篇 |
2010年 | 12篇 |
2009年 | 26篇 |
2008年 | 25篇 |
2007年 | 23篇 |
2006年 | 29篇 |
2005年 | 17篇 |
2004年 | 20篇 |
2003年 | 19篇 |
2002年 | 13篇 |
2001年 | 25篇 |
2000年 | 15篇 |
1999年 | 12篇 |
1998年 | 24篇 |
1997年 | 28篇 |
1996年 | 20篇 |
1995年 | 5篇 |
1994年 | 10篇 |
1993年 | 5篇 |
1992年 | 4篇 |
1991年 | 7篇 |
1990年 | 6篇 |
1989年 | 7篇 |
1988年 | 8篇 |
1987年 | 1篇 |
1986年 | 3篇 |
1985年 | 7篇 |
1984年 | 1篇 |
1983年 | 3篇 |
1982年 | 2篇 |
1981年 | 5篇 |
1980年 | 3篇 |
1978年 | 3篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1975年 | 3篇 |
排序方式: 共有475条查询结果,搜索用时 539 毫秒
91.
.
zsarlak E. Schepens P. M. Parizel J. W. Van Goethem F. Vanhoenacker A. M. De Schepper J. J. Martin 《European journal of radiology》2001,40(3):184-197
This article presents the actual classification of neuromuscular diseases based on present expansion of our knowledge and understanding due to genetic developments. It summarizes the genetic and clinical presentations of each disorder together with CT findings, which we studied in a large group of patients with neuromuscular diseases. The muscular dystrophies as the largest and most common group of hereditary muscle diseases will be highlighted by giving detailed information about the role of CT and MRI in the differential diagnosis. The radiological features of neuromuscular diseases are atrophy, hypertrophy, pseudohypertrophy and fatty infiltration of muscles on a selective basis. Although the patterns and distribution of involvement are characteristic in some of the diseases, the definition of the type of disease based on CT scan only is not always possible. 相似文献
92.
Jan E. Vandevenne Filip Vanhoenacker Jestinah M. Mahachie John Geert Gelin Paul M. Parizel 《Skeletal radiology》2009,38(7):669-674
Purpose The purpose of this paper was to evaluate if short volumetric interpolated breath-hold examination (VIBE) sequences can be
used as a substitute for T1-weighted with fat saturation (T1-FS) sequences when performing magnetic resonance (MR) arthrography
to diagnose rotator cuff tears.
Materials and methods Eighty-two patients underwent direct MR arthrography of the shoulder joint using VIBE (acquisition time of 13 s) and T1-FS
(acquisition time of 5 min) sequences in the axial and paracoronal plane on a 1.0-T MR unit. Two radiologists scored rotator
cuff tendons on VIBE and T1-FS images separately as normal, small/large partial thickness and full thickness tears with or
without geyser sign. T1-FS sequences were considered the gold standard. Surgical correlation was available in a small sample.
Results Sensitivity, specificity, and positive and negative predictive values of VIBE were greater than 92% for large articular-sided
partial thickness and full thickness tears. For detecting fraying and articular-sided small partial thickness tears, these
parameters were 55%, 94%, 94%, and 57%, respectively. The simple kappa value was 0.76, and the weighted kappa value was 0.86
for agreement between T1-FS and VIBE scores. All large partial and full thickness tears at surgery were correctly diagnosed
using VIBE or T1-FS MR images.
Conclusion Fast MR arthrography of the shoulder joint using VIBE sequences showed good concordance with the classically used T1-FS sequences
for the appearance of the rotator cuff, in particular for large articular-sided partial thickness tears and for full thickness
tears. Due to its very short acquisition time, VIBE may be especially useful when performing MR arthrography in claustrophobic
patients or patients with a painful shoulder. 相似文献
93.
PK Tran A Haworth F Foroudi A Paneghel AG Herschtal KH Tai SG Williams S Soteriou M Laferlita GM Duchesne 《Journal of Medical Imaging and Radiation Oncology》2009,53(6):574-580
The aim of this study is to prospectively evaluate and model surrogate explanatory variables (SEVs) of target coverage and rectal dose pertaining to soft tissue anatomy visualised on cone beam computed tomography (CBCT) for incorporation into post‐prostatectomy treatment coverage verification protocols. Twenty post‐prostatectomy patients treated with conformal prostate bed radiotherapy (64–74 Gy) underwent CBCT daily at fractions 1 to 5, and then weekly. Treatment coverage was defined on each CBCT using ‘PTV95’, percentage of the CBCT PTV covered by original treatment fields, and ‘RECTD50’, dose delivered to 50% of CBCT rectal volume by original treatment fields. Three candidate SEVs for treatment coverage were defined for each scan: anterior rectal wall movement, change in bladder length and bladder base movement. Both anterior rectal wall movement and increase in bladder length predicted for the decreased PTV95 (P < 0.001 for each). Anterior movement of the anterior rectal wall predicted for increased RECTD50 (P < 0.001). Predictive models for the PTV95 and RECTD50 that accept the significant SEVs as inputs were developed. We developed simple CBCT‐acquired soft tissue anatomic surrogate measures that signal changes in target coverage and rectal dose during post‐prostatectomy radiotherapy. Conventional bony anatomy patient position verification protocols were inadequate in accounting for soft tissue target and organ variation seen with CBCT. 相似文献
94.
W.-J. Metsemakers J. Duchateau F. Vanhoenacker J. De Leersnyde 《Acta chirurgica Belgica》2013,113(5):382-385
Case report : We report a 69-year-old Caucasian male who presented with irreversible ischemia to the left foot. CT-scan showed, besides occlusion of both superficial femoral arteries, a chronic contained rupture of an abdominal aortic aneurysm. The aneurysm was excluded with a stent graft placed through a femoral approach in a semi-urgent procedure. CT-scans at 1, 3 and 6 months demonstrated continued exclusion of the aneurysm. Chronic ruptures are a rare but important subset of ruptured abdominal aortic aneurysms. CT-scan with contrast enhancement is the gold standard diagnosing technique. Treatment consists of prompt surgical intervention with endovascular repair being increasingly used as an alternative to an open surgical approach. 相似文献
95.
96.
常用抗高血压药物对血压的时间生物学特征的影响 总被引:1,自引:0,他引:1
目的 :探讨 3类常用抗高血压药物对非杓型的高血压病患者BP的时间生物学特征的影响。方法 :共入选非杓型BP分布的高血压病患者 16 1例 ,将其随机分为 3组 ,分别给予赖诺普利 (10mg·d-1) ,非洛地平 (2 5mg·d-1) ,或氢氯噻嗪 (5 0mg·d-1) ,并于治疗前后行 2 4h动态BP监测。采用余弦拟合方法分析治疗前后患者BP时间生物学特征的改变。结果 :赖诺普利组与非洛地平组治疗后 2 4hBP均值明显降低 ,但其振幅、峰值相位无变化 ;氢氯噻嗪治疗降压效果不甚理想 ,但显著增加了患者BP的夜间降低幅度 ,使患者BP由非杓型转变为杓型分布。结论 :氢氯噻嗪治疗可能使非杓型分布的高血压病患者的BP转变为杓型分布 ,从而有助于降低患者相关并发症的发生率。 相似文献
97.
98.
99.
100.
Primary non-Hodgkin lymphoma of the large bowel 总被引:14,自引:0,他引:14