共查询到19条相似文献,搜索用时 94 毫秒
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目的:为提高床旁X线摄影的图像质量和工作效率,对现有的移动式X线机进行数字化改造,实现床旁数字化X线摄影。方法:通过原有的移动式X线机与无线平板探测器及基于该平板探测器而设计的数字化X线成像系统和曝光同步控制系统,构建组成移动式数字化X线摄影系统技术平台(以下简称移动DR技术平台或移动DR)。结果:移动DR技术平台性能稳定,所拍摄的床旁X线图像清晰,质量较以前的CR模式有较大的提高,而且曝光条件较CR模式低。结论:移动DR技术平台能充分的利用原有移动X线机,所拍摄的床旁X线图像清晰,工作效率大大提高,且辐射剂量大幅降低。 相似文献
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目的:探讨数字放射成像技术的临床应用价值。方法:收集2013年1月至2014年1月期间,我院接受胸部影像学检查的患者115例,分别应用常规X线检查以及数字X射线DR摄影,比较两种检查技术的图像质量。结果:115例患者经胸部数字化X射线检查显示,图像的清晰度以及对比度均较好,对于细微结构的图像显示效果也较为清晰。数字化X射线图像质量分级显著优于常规X射线检查图像(P〈0.05)。结论:数字化X射线DR摄影能够有效克服非直接转换技术探测器因闪烁体或者增感屏内光纤散射所致图像模糊等情况,提高图像清晰度,且数字化过程环节相对减少,可降低影像信息丢失,提高空间分辨率和诊断效能,值得推广应用。 相似文献
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迅速发展的医学影像技术 总被引:2,自引:0,他引:2
本文总结了近些年来医学影像技术取得的新进展,如:计算机X线摄影CR、计算机断层X线摄影CT、磁共振成像MRI、数字减影血管造影DSA、图像存贮与通讯系统PACS等,并综述了中华医学会于2001年召开的医学影像学第三次全国学术会议上发表的一些学术论文。 相似文献
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医用数字X射线摄影系统检测方法 总被引:2,自引:0,他引:2
医用数字X射线摄影系统作为先进的数字化大型医疗诊断设备,已广泛应用于大、中型医院.如何对其系统性能进行检查和保持影像最优质量,一直没有检测的技术依据.本文根据医用数字X射线摄影系统的技术特性,参考IEC标准和国家标准,验证和确定了检测参数和技术指标,研究制定出医用数字X射线摄影系统检测方法.为计量技术机构开展检定和医院质量控制,挺供了技术依据. 相似文献
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本文根据口腔数字全景X射线摄影系统的技术特性,在实验数据基础上分析、研究,确定检测参数和技术指标,制定出口腔数字全景X射线摄影系统检测方法,为计量系统及医院质量控制,提供检测技术依据。 相似文献
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目的:为了保证医用数字化X射线摄影系统的正常运行,满足临床诊断要求,必须定期对设备进行严格的计量检定。方法:按照国家有关计量检定规程,采用合适的检测模体对医用数字X线摄影系统进行检测。结果:对检测数据进行统计分析,确定设备的各项性能技术指标是否合格。结论:定期进行医用数字X线摄影系统的计量检定,可以帮助医院对设备的质量控制,保证系统的安全性和有效性。 相似文献
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本文概述了数字射线照相的技术优势及在无损探伤检测中的应用前景和强大生命力;传统工业胶片射线照相面临数字射线照相的挑战和机遇。较详细阐述了数字射线照相技术成像系统的分类和工作原理、特点及性能比较。 相似文献
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工业非胶片射线照相技术 二.数字射线成像 总被引:1,自引:1,他引:0
数字射线成像不同于射线实时成像,存数字射线成像系统巾,由各种各样传感器捕获的射线影像信息以电子数据的形式存储存特定的存储器巾,以便进一步处理或存档。本文阐述数字射线成像的一些基本观念、技术、成像系统,以及采用的相关传感器如:1.涂布在非品硅薄膜晶体管上的荧光体:2.涂布在薄膜晶体管上的非晶硒光电导体;3.涂布在电荷耦合器或互补金属氧化物上的荧光体;4.可进行光激励的存储荧光体;5.涂布在线阵列器上的荧光体:6.扫描电子束法等. 相似文献
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工业非胶片射线照像技术 一.射线实时成像 总被引:1,自引:1,他引:0
传统的工业胶片射线照相正受到数字射线照相的严重挑战。射线照相图像的探测器从胶片到图像增强器,从荧光体成像板到非晶硅和非晶硒成像板,再到阵列探测器,射线检测系统从硬件到软件在不断翻新,工业射线检查的效率和可靠性也在不断提高。采用与计算机结合的非胶片射线照相技术,能大大减少曝光时间,缩短检测周期,还可以完全避免由胶片冲洗引起的环境污染,而且射线照相影像便于存档、检索、远程传递和评定。本文系列介绍有关这方面的新技术。 相似文献
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本文总结了胸部射线摄影一些成就突出的新数字成像系统的近年进展情况,如:基于荧光储存系统的数字射线摄影、硒探测器系统、即时减影技术等,并提出了对配套应用的几种监视器的评价。 相似文献
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The transition to digital radiology has provided new opportunities for improved image quality, made possible by the superior detective quantum efficiency and post-processing capabilities of new imaging systems, and advanced imaging applications, made possible by rapid digital image acquisition. However, this transition has taken place largely without optimising the radiographic technique used to acquire the images. This paper proposes a framework for optimising the acquisition of digital X-ray images. The proposed approach is based on the signal and noise characteristics of the digital images and the applied exposure. Signal is defined, based on the clinical task involved in an imaging application, as the difference between the detector signal with and without a target present against a representative background. Noise is determined from the noise properties of uniformly acquired images of the background, taking into consideration the absorption properties of the detector. Incident exposure is estimated or otherwise measured free in air, and converted to dose. The main figure of merit (FOM) for optimisation is defined as the signal-difference-to-noise ratio (SdNR) squared per unit exposure or (more preferably) dose. This paper highlights three specific technique optimisation studies that used this approach to optimise the radiographic technique for digital chest and breast applications. In the first study, which was focused on chest radiography with a CsI flat-panel detector, a range of kV(p) (50-150) and filtration (Z = 13-82) were examined in terms of their associated FOM as well as soft tissue to bone contrast, a factor of importance in digital chest radiography. The results indicated that additive Cu filtration can improve image quality. A second study in digital mammography using a selenium direct flat-panel detector indicated improved SdNR per unit exposure with the use of a tungsten target and a rhodium filter than conventional molybdenum target/molybdenum filter techniques. Finally, a third study focusing on cone-beam computed tomography of the breast using a CsI flat-panel detector indicated that high Z filtration of a tungsten target X-ray beam can notably improve the signal and noise characteristics of the image. The general findings highlight the fact that the techniques that are conventionally assumed to be optimum may need to be revisited for digital radiography. 相似文献
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In clinical radiological practice two main questions regarding image quality have to be looked at: Which degree of image quality is needed? and: How can this image quality be objective? Image quality requirements depend on size, density and contrast of the objects of interest and on the clinical question which has to be answered. In comparison to conventional radiography, the digital radiographic techniques offer additional features concerning optimisation of image quality and dose, like a wider dynamic range, digital fluoroscopic techniques and post-processing. Therefore it is necessary to define new quality criteria for these techniques. In the following, typical examples demonstrate the development of the 'Diagnostic Requirements for Digital Radiographic Procedures'. These examinations include projection radiographs with digital luminiscent radiography, fluoroscopic procedures with digital image intensifier radiography and angiographic procedures with digital subtraction angiography. The clinical question of a radiological examination also forms the background to optimisation strategies considering image quality and radiation dose. 相似文献
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The use of neutron beams for radiographic purposes is a relatively new method of non-destructive testing. This paper is a general review of the technique. The various sources of neutrons and image recorders which may be used are discussed with particular emphasis on photographic recorders. Problems in which neutron radiography is expected to show advantages over conventional radiography are outlined, and some results are presented. 相似文献
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