The Research Of Multilayer Spiral CT Angiography And Digital Subtraction Angiography Image Quality

ObjeCTive：This article by die bodies simulation analysis of digital subtraction angiography (DSA)and MDCT (MSCT) of coronary artery imaging contrast, resolution and density of thediversity of value, looking for a different different concentration of DSA patients contrastand the influence of CT imaging, which according to the patient and contrast agents of theconcentration of the different choices of coronary heart disease diagnosis way to check.Materials and methods：In this paper by using acrylic resin flat and water tank homemade water die bodies,the simulation of different density contrast agents and different diameter of blood vessels,and in DSA and MSCT respectively under imaging scans, analysis of two imagingequipment physical performance, the difference of both the blood vessels of the image inthe noise density of the values of the resolution and density differences. By two seniorimage in a double-blind manner to two kinds of equipment to the image of thecomprehensive analysis, the choice that can distinguish between smallest blood vessels ofthe image as a low resolution image contrast.Results：According to the charaeristics of different imaging system, will dose optimizationscheme divided into two groups, with two imaging system, to the body check module.MSCT high dose respectively and low dose scanning, get a set of data; DSA differentperspeive and movie mode, get a second group of image data.Conclusion：Digital subtraction angiography DSA imaging quality and radiation dose effect, is bythe system of perspeive conditions and photography conditions radiation fields andadditional filter size, image intensifiers size, the Angle of view of geometric amplification. All can affect the word subtraion angiography DSA produce and the imaging quality ofradiation dose; And the scanning mode, MSCT system frame speed, deteors width, FOVsize of CT imaging quality and the radiation dose effect. High doses conditions, twoequipment to make two sets of images no obvious difference. But in low doses conditions,satisfying imaging diagnostic requirements of the situation, MSCT with higher output thanDSA dose. Therefore, in does not affect the precondition of diagnosis, the choice ofreasonable DSA imaging approach, can get high quality images in at the same time, reducethe patient from the radiation dose.