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| 1 | Current status of low dose multi-detector CT in the urinary tract显示文摘Over the past several years,advances in the technical domain of computed tomography(CT) have influenced the trend of imaging modalities used in the clinical evaluation of the urinary system.Renal collecting systems can be illustrated more precisely with the advent of multi-detector row CT through thinner slices,high speed acquisitions,and enhanced longitudinal spatial resolution resulting in improved reformatted coronal images.On the other hand,a significant increase in exposure to ionizing radiation,especially in the radiosensitive organs,such as the gonads,is a concern with the increased utilization of urinary tract CT.In this article,we discuss the strategies and techniques availablefor reducing radiation dose for a variety of urinary tractCT protocols with metabolic clinical examples.We also reviewed CT for hematuria evaluation and related scan parameter optimization such as,reducing the number of acquisition phases,CT angiography of renal donors and lowering tube potential,when possible. | Mi Kim Sung Sarabjeet Singh Mannudeep K Kalra | 2011 | World Journal of Radiology2011，3，11： | 4 |
| 2 | Coronary CT angiography:Beyond morphological stenosis analysis显示文摘Rapid technological developments in computed tomography(CT)imaging technique have made coronary CT angiography an attractive imaging tool in the detection of coronary artery disease.Despite visualization of excellent anatomical details of the coronary lumen changes,coronary CT angiography does not provide hemodynamic changes caused by presence of plaques.Computational fluid dynamics(CFD)is a widely used method in the mechanical engineering field to solve complex problems through analysing fluid flow,heat transfer and associated phenomena by using computer simulations.In recent years,CFD is increasingly used in biomedical research due to high performance hardware and software.CFD techniques have been used to study cardiovascular hemodynamics through simulation tools to assist in predicting the behaviour of circulatory blood flow inside the human body.Blood flow plays a key role in the localization and progression of coronary artery disease.CFD simulation based on 3D lumina reconstructions can be used to analyse the local flow fields and flow profiling due to changes of vascular geometry,thus,identifying risk factors for development of coronary artery disease.The purpose of this article is to provide an overview of the coronary CT-derived CFD applications in coronary artery disease. | Akmal Sabarudin Zhonghua Sun | 2013 | World Journal of Cardiology2013，5，12： | 2 |
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