ponentsofimagequalityarecontrast,spatialresolution,:又称高对比度分辨率(highcontrastresolution),是指在高对比度(密度分辨率大于10%)的情况下鉴别细微的能力,即显示最小体积病灶或结构的能力QuantifiesimageblurringSpatialResolution定义是在两种物质CT值相差100HU以上时,能分辨最小的圆形孔径或是黑白相间的线对数,单位是lp/cm。5÷lp/cm=可分辨的最小物体的直径(mm)“Pair”isoneobject+onespaceOnePairPhantoms–SpatialResolution空间分辨率Displaymatrix重建算法焦点尺寸探测器孔径层厚采样频率高清模式空间分辨率“viewsperrotation”(VPR)referstothenumberofsamplestakenwitheveryrotationofthegantryHiRes2496ViewsImproveIQLikeVCT984Views层厚影响空间分辨率Hi-ResolutionCTTechnique高分辨率CT扫描技术Verysmallslicethicknesses1-2mmHighspatialfrequencyalgorithmsincreasesresolutionincreasesnoiseNoisecanbeoffsetbyusinghigherdosesOptimizedwindow/levelsettingsSmallfieldofview(FOV)StandardAlgorithm“Lung”Algorithm滤波算法影响空间分辨率
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