The sizes of focal spot and detector aperture are the factors affecting ct image quality.
射线源焦点及探测器孔径大小是导致CT图象降质的主要因素。
Ct image quality for mass and patch in the lung of patients that were selected randomly was compared.
比较了不同扫描条件下，患者肺部肿块影及片状影的CT图像质量。
Objective: this paper only discusses the typical methods for CT image quality evaluation considering that different vendors use different evaluation methods.
前言： 目的：文中详细讨论了典型的CT图像评价指标。
Describes the effects on image quality by controlling the subjective factors and objective factors, and the measures of ct image quality assurance and ct image quality control.
本文阐述了主观和客观因素的控制对成像质量的影响，CT扫描的影像质量保证的方法和CT扫描质量控制的内容。
Dual-energy CT has also been shown to allow for improvements in image quality and reduction in artifacts such as beam hardening that have traditionally limited CT perfusion imaging(101).
双能CT也已被证明能够改进图像质量和减少伪影如射线硬化等在CT灌注成像方面的传统局限性（101）。
Objective To study the effects of gantry rotation time on image quality in 64 - slice spiral ct.
目的研究不同机架旋转时间对64层螺旋CT图像质量的影响。
Objective:To evaluate the image quality of lung spiral CT scanning in two different directions.
目的：对比分析两种不同方向的肺部螺旋CT扫描的图像质量。
How to effectively reduce the radiation dose and ensure the quality of image of the child patients in the ct examination should engage fully understanding by the radiation workers.
儿童患者在CT检查中怎样有效减少辐射剂量，同时又能保证图像质量，作为从事放射工作人员应该充分认识。
Quantitative analysis of scan conditions was carried out by using ct scan optimization factor as a comprehensive index to evaluate image quality and patient dose.
本文用CT扫描“优化因子”作为图像质量、病人所受剂量的综合评价指标，实现了CT扫描条件优化的定量分析。
Objective:To determine the display effect of non-dilated ureter with reducing mA on the image quality in patients undergoing multi-slice CT urography, and to measure the normal ureter size.
目的：探讨多层螺旋CT尿路造影对非扩张性输尿管图像质量的影响，并测量输尿管管径大小正常值范围。
Objective To discuss the influences of changing pitch and width of sets to image quality when scanning styloid process with multi-slice CT.
目的：探讨茎突高分辨率CT扫描时改变螺距及准置器宽度对图像质量的影响。
Objective To investigate the influence of heart rate and fluctuation of heart rate on image quality of 16-slice spiral CT coronary angiography (16-MSCTA).
目的探讨心率及心率波动对16层螺旋CT冠状动脉成像（16-MSCTA）图像质量的影响。
This paper mainly introduced the important parameters for image quality of Multislice ct. The influencing factors of these parameters were also discussed.
本文主要介绍多排螺旋CT图像质量评价主要参数以及每种参数的主要影响因素。
Results Linear interpolation method and pitch affect the image quality of multi slice CT.
结果多层面CT机的质量与插值方法、螺距等因素有关。
A metal artifacts reduction method using nonlinear weights was developed to suppress metal artifacts in X-ray CT(computerized tomography) images to improve the image quality.
为抑制计算机层析造影（CT）系统重建图像中出现的金属伪影，提高图像的质量，采用一种基于金属投影非线性权重衰减的方法进行校正。
The results indicated that the image quality of CT colonography and the sensitivity for detecting simulated polyps improved with the decrease of collimation and pitch.
结果显示，随准直和螺距的减小，图像质量提高，息肉的检出率提高；
Purpose: To analyse the factors affecting image quality of coronary angiography with multi slice helical CT.
目的：分析影响多层面螺旋CT冠状动脉成像质量的因素。
Conclusion The optimized injection rate and reconstruction matrix parameters of lower limb ct angiography could improve image quality.
结论正确的注射速率和重建方法选择是提高螺旋CT下肢动脉血管成像质量的关键。
Disclosed are a method for rebuilding image with good quality in the condition of no relative data and X-ray CT device which can do the image rebuilding.
实现即使在完全没有相对数据的情况下也可重构质量好的图像的方法、和可进行这种图像重构的X射线CT装置。
Conclusion Image quality of 64-slice ct coronary angiography affected by the patient's heart rate, fluctuation of heart rate, breathing artifact and reconstruction phase.
结论64层螺旋ct冠状动脉成像质量受到患者心率、心率波动幅度、呼吸运动伪影及重建时相的影响。
Objective to compare the image quality of three-dimensional spiral ct portography (3d-sctp) produced by SSD with that by MIP and to make preliminary evaluation for its clinical application.
目的比较最大强度投影(mip)和表面遮盖显示(SSD)两种三维螺旋CT门静脉成像(3d - SCTP)重建方法的成像质量，初步评价3d - SCTP对肝硬化门静脉高压患者的临床应用价值。
Results The image quality and diagnostic accuracy of CT coronal scan proved superior to those of CT axial scan. Conclusion CT coronal scan is th...
结果：冠状位扫描图像质量及诊断准确率优于轴位扫描。
Image quality of target vessel fluency assessed by multi-slice helical ct: Does effect of coronary stent materials and structures exist?
多层螺旋CT评价靶血管通畅性图像的质量：冠状动脉支架材料及其结构有影响吗？
In order to obtain superb image quality, efforts should be made to control and reduce CT noise by using pitch.
为了获得良好的CT图像，应该利用螺距来控制和减小螺旋CT图像的噪声。
Objective To investigate the influence of scanning and reconstruction parameters on image quality in multi-slice ct angiography (MSCTA).
目的探讨多层面螺旋CT血管成像(MSCTA)中扫描参数和重建方法的影响。
OBJECTIVE: To evaluate image quality of Multi-slice Spiral CT (MSCT) in the coronary artery imaging and the diagnostic accuracy in determining coronary lesions.
目的：评价多层螺旋ct冠状动脉成像效果以及在冠状动脉狭窄诊断中的应用价值。
Methods The coronary artery imaging data of 981 patients who examined by 64-slice ct were collected from August 2005 to April 2006. The image quality and its influencing factors were analyzed.
方法收集我院2005年8月- 2006年4月行64层螺旋ct冠状动脉成像的981位患者的影像资料，分析成像质量及其影响因素。
Objective to investigate the influencing factors on image quality of dual source ct coronary angiography by retrospective analysis of the images of 150 patients with suspected coronary artery disease.
目的本研究对150例疑诊冠心病患者双源ct冠脉图像进行回顾性分析，探讨图像质量的影响因素和改善措施。
Objective To evaluate retrospective cine ECG-gated multislice CT (ECG-MSCT) scanning in reducing cardiac motion artifacts and in improving image quality of the lung.
目的评价回顾性电影法心电门控多层螺旋CT（ECG-MSCT）肺部扫描的作用。
The noise is one key parameter on routine quality control. Because the image noise is a function of the dose, precisely measuring the noise is also a method for measuring the dose of ct scanners.
在质量控制过程中，噪声是重要的指标之一，由噪声与曝光剂量的函数关系，准确测量噪声还可以作为测量曝光剂量的方法。
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