四种品牌CT设备成像质量的研究

The Study of Image Quality Among Four Different Branded CT Products

目的 该文研究了四种品牌CT设备在采用不同剂量进行扫描且采用两种不同种类重建算法的情况下,四台CT机产生的图像质量的差异,并分析不同品牌厂家的CT设备和重建算法对成像质量产生的影响。方法 本研究使用Catphan500模体作为扫描对象。管电压在120k V的条件下,分别使用临床常规mAs和100m As的扫描剂量下,选择四种品牌高端CT设备对Catphan500模体进行头部的轴位扫描。结果 图像质量对比结果:传统FBP重建、常规扫描剂量下,成像质量排序:256iCT>宝石CT、640CT;迭代重建、常规扫描剂量下,成像质量排序:新双源Force CT>宝石CT、640CT;传统FBP重建、低剂量下,成像质量排序:新双源Force CT>宝石CT;迭代重建、低剂量下,成像质量排序:宝石CT<其它三台CT。迭代算法的影响分析:在低剂量条件下,采用迭代算法与使用传统FBP算法重建相比,这四台CT设备的图像质量有显著性的提高;在常规剂量条件下,采用迭代算法与使用传统FBP算法重建相比,除256iCT以外,其它三台CT图像质量有显著性的提高。结论 在常规剂量的条件下,本研究建议选择西门子新双源Force CT、飞利浦Brilliance-256iCT;在低剂量(100m As)条件下,本研究建议选择飞利浦256iCT、西门子新双源Force CT和东芝640CT;为了获得最佳的成像质量,建议选择迭代算法进行图像重建。

Objective This paper studies the difference of image quality produced by four brands of CT equipment when four brands of CT equipment use different doses for scanning and two different kinds of reconstruction algorithms,and analyzes the impact of CT equipment and reconstruction algorithms from different brands of manufacturers on image quality.Methods Under the condition of 120kV tube voltage,four brands of high-end CT equipment were selected to perform axial scanning of the head of the Catphan500 phantom with the scanning dose of clinical conventional mAs and 100mAs respectively.Results Results of image quality comparison:Under the traditional FBP reconstruction and conventional scanning dose,the imaging quality order is 256iCT>gem CT,640CT;Under iterative reconstruction and conventional scanning dose,the imaging quality is ranked as follows:new dual source Force CT>gem CT,640CT;under traditional FBP reconstruction and low dose,the imaging quality is ranked as follows:new dual source Force CT>gem CT;Under iterative reconstruction and low dose,the imaging quality is ranked as follows:gem CT<other three CT's.Analysis of the impact of iterative algorithm:Under low dose conditions,compared with traditional FBP algorithm,the image quality of these four CT devices has been significantly improved;Under the condition of conventional dose,compared with the traditional FBP algorithm,the iterative algorithm has significantly improved the image quality of the other three CT except 256i CT.Conclusion Under the condition of conventional dose,this study suggests that Siemens new dual source Force CT and Philips Brilliance-256iCT should be selected;Under the condition of low dose(100mAs),Philips 256iCT,Siemens new dual source Force CT and Toshiba 640CT are recommended for this study;In order to obtain the best imaging quality,it is recommended to select iterative algorithm for image reconstruction.