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101.
Brett W. Sperry Balaji K. Tamarappoo Jorge D. Oldan Omair Javed Daniel A. Culver Richard Brunken Manuel D. Cerqueira Rory Hachamovitch 《JACC: Cardiovascular Imaging》2018,11(2):336-345
Objectives
This study sought to evaluate the incremental value of quantifying the extent and severity of myocardial perfusion and 18F-labeled fluorodeoxyglucose (FDG) abnormalities in predicting adverse outcomes among patients with suspicion for cardiac sarcoidosis (CS).Background
Positron emission tomography (PET) with FDG is a key component of the noninvasive assessment of patients with suspected CS. However, the optimal method for image interpretation has not been defined.Methods
A retrospective analysis was performed of 203 patients who underwent perfusion and FDG-PET imaging to evaluate for CS. Imaging findings were scored by conventional 3-category methods (normal perfusion and metabolism, abnormal perfusion or metabolism, abnormal perfusion and metabolism) and by summed scores using the 17-segment model to represent extent and severity of disease. Heterogeneity of metabolism was quantified using the coefficient of variation (SD divided by the mean) of FDG uptake. Multivariable Cox models were developed to assess associations between imaging findings and adverse events (death, heart transplant, or ventricular arrhythmia requiring defibrillation).Results
The indication for FDG-PET was ventricular arrhythmia in 69 (34%), heart block in 16 (8%), cardiomyopathy in 54 (27%), and other indications in 64 (32%). There were 63 patients who developed adverse events over a mean follow-up of 1.8 years. After robust adjustment, only the summed score in segments with a perfusion–metabolism mismatch and the coefficient of variation were important prognostically (p = 0.029 and p = 0.041, respectively).Conclusions
Quantitative measures of extent and severity of perfusion–metabolism mismatch and coefficient of variation of FDG uptake provide an incremental prognostic advantage in patients undergoing FDG-PET for CS. These results support the use of a more detailed analysis of imaging findings, as is conventional in coronary artery disease. 相似文献102.
Max L. Senders Xuchu Que Young Seok Cho Calvin Yeang Hannah Groenen Francois Fay Claudia Calcagno Anu E. Meerwaldt Simone Green Phuong Miu Mark E. Lobatto Thomas Reiner Zahi A. Fayad Joseph L. Witztum Willem J.M. Mulder Carlos Pérez-Medina Sotirios Tsimikas 《Journal of the American College of Cardiology》2018,71(3):321-335
Background
Oxidation-specific epitopes (OSEs) are proinflammatory, and elevated levels in plasma predict cardiovascular events.Objectives
The purpose of this study was to develop novel positron emission tomography (PET) probes to noninvasively image OSE-rich lesions.Methods
An antigen-binding fragment (Fab) antibody library was constructed from human fetal cord blood. After multiple rounds of screening against malondialdehyde-acetaldehyde (MAA) epitopes, the Fab LA25 containing minimal nontemplated insertions in the CDR3 region was identified and characterized. In mice, pharmacokinetics, biodistribution, and plaque specificity studies were performed with Zirconium-89 (89Zr)-labeled LA25. In rabbits, 89Zr-LA25 was used in combination with an integrated clinical PET/magnetic resonance (MR) system. 18F-fluorodeoxyglucose PET and dynamic contrast-enhanced MR imaging were used to evaluate vessel wall inflammation and plaque neovascularization, respectively. Extensive ex vivo validation was carried out through a combination of gamma counting, near infrared fluorescence, autoradiography, immunohistochemistry, and immunofluorescence.Results
LA25 bound specifically to MAA epitopes in advanced and ruptured human atherosclerotic plaques with accompanying thrombi and in debris from distal protection devices. PET/MR imaging 24 h after injection of 89Zr-LA25 showed increased uptake in the abdominal aorta of atherosclerotic rabbits compared with nonatherosclerotic control rabbits, confirmed by ex vivo gamma counting and autoradiography. 18F-fluorodeoxyglucose PET, dynamic contrast-enhanced MR imaging, and near-infrared fluorescence signals were also significantly higher in atherosclerotic rabbit aortas compared with control aortas. Enhanced liver uptake was also noted in atherosclerotic animals, confirmed by the presence of MAA epitopes by immunostaining.Conclusions
89Zr-LA25 is a novel PET radiotracer that may allow noninvasive phenotyping of high-risk OSE-rich lesions. 相似文献103.
104.
105.
Su Jin Lee Joon Young Choi Hwan Joo Lee Chung-Hwan Baek Young-Ik Son Seung Hyup Hyun Seung Hwan Moon Byung-Tae Kim 《Korean journal of radiology》2012,13(6):752-759
Objective
To evaluate the prognostic value of volume-based metabolic parameters measured with 18F-fluorodeoxyglucose (18F-FDG) positron emission tomography (PET) in patients with clinically node-negative (cN0) oral tongue squamous cell carcinoma (OTSCC) as compared with other prognostic factors.Materials and Methods
In this study, we included a total of 57 patients who had been diagnosed with cN0 tongue cancer by radiologic, 18F-FDG PET/CT, and physical examinations. The maximum standardized uptake value (SUVmax), average SUV (SUVavg), metabolic tumor volume (MTV), and total lesion glycolysis (TLG) for primary tumors were measured with 18F-FDG PET. The prognostic significances of these parameters and other clinical variables were assessed by Cox proportional hazards regression analysis.Results
In the univariate analysis, pathological node (pN) stage, American Joint Committee on Cancer (AJCC) stage, SUVmax, SUVavg, MTV, and TLG were significant predictors for survival. On a multivariate analysis, pN stage (hazard ratio = 10.555, p = 0.049), AJCC stage (hazard ratio = 13.220, p = 0.045), and MTV (hazard ratio = 2.698, p = 0.033) were significant prognostic factors in cN0 OTSCC patients. The patients with MTV ≥ 7.78 cm3 showed a worse prognosis than those with MTV < 7.78 cm3 (p = 0.037).Conclusion
The MTV of primary tumor as a volumetric parameter of 18F-FDG PET, in addition to pN stage and AJCC stage, is an independent prognostic factor for survival in cN0 OTSCC. 相似文献106.
107.
108.
Eric L. Grogan Stephen A. Deppen Karla V. Ballman Gabriela M. Andrade Francys C. Verdial Melinda C. Aldrich Chiu L. Chen Paul A. Decker David H. Harpole Robert J. Cerfolio Robert J. Keenan David R. Jones Thomas A. D’Amico Joseph B. Shrager Bryan F. Meyers Joe B. Putnam Jr. 《The Annals of thoracic surgery》2014
109.
Saskia P. A. Wolfensberger Bart N. M. van Berckel Anu J. Airaksinen Kaoru Maruyama Mark Lubberink Ronald Boellaard William D. H. Carey Wieb Reddingius Dick J. Veltman Albert D. Windhorst Josée E. Leysen Adriaan A. Lammertsma 《Molecular imaging and biology》2009,11(4):241-245
Purpose NK1 receptors have been implicated in various neuropsychiatric and other disorders. R116301 is a selective NK1 receptor antagonist.
In this pilot study, [11C]R116301 was evaluated as a potential positron emission tomography (PET) ligand for the NK1 receptor.
Procedures Two dynamic PET studies were performed in three normal volunteers before and after a blocking dose of aprepitant. Data were
analyzed using striatum to cerebellum standardized uptake value (SUV) ratios.
Results Baseline SUV ratios at 60–90 min after injection ranged from 1.22 to 1.70. Following aprepitant administration, this specific
signal was completely blocked. Aprepitant administration did not significantly affect uptake in cerebellum, confirming the
absence of NK1 receptors in cerebellum.
Conclusion These preliminary results indicate that [11C]R116301 has potential as a radioligand for in vivo assessment of NK1 receptors in the human brain. 相似文献
110.
Axel Van Der Gucht Benjamin Serrano Florent Hugonnet Benoît Paulmier Nicolas Garnier Marc Faraggi 《European journal of radiology》2014
PET acquisition requires several minutes which can lead to respiratory motion blurring, to increase partial volume effect and SUV under-estimation. To avoid these artifacts, conventional 10-min phase-based respiratory gating (PBRG) can be performed but is time-consuming and difficult with a non-compliant patient. We evaluated an automatic amplitude-based gating method (AABG) which keeps 35% of the counts at the end of expiration to minimize respiratory motion. We estimated the impact of AABG on upper abdominal lesion detectability, quantification and patient management. 相似文献