(能譜)ct圖像質(zhì)量-文庫(kù)吧資料
2025-02-25 14:22本頁(yè)面
【正文】 Gee David CT Artifacts: Partial Volume Effect ? CT ’s based on linear attenuation coefficient for tissue voxels ? If voxel nonuniform (contains several materials), detection process will average ? Can appear as ? incorrect densities ? Streaks and bands ? Minimizing ? Use thinner slices Gee David Gee David 謝 謝！ Gee David ?描述 CT 圖像質(zhì)量的三個(gè)主要參數(shù) : 空間分辨率、密度分辨率、噪聲 ?對(duì)比度 (密度 )分辨率 : 指當(dāng)細(xì)節(jié)與背景之間具有低對(duì)比度時(shí)，將一定大小的細(xì)節(jié)從背景中辨別出來(lái)的能力。噪聲的存在會(huì)掩蓋這些對(duì)比度。 Gee David 在軟組織研究病例中 , 用高 mAs來(lái)保持低噪聲是非常重要的。less photons detected 187。 內(nèi)插算法的 Z軸分辨率會(huì)下降 30％ Gee David Gee David CT 對(duì)比度 Gee David Components of image contrast 對(duì)比度構(gòu)成 Contrast present in a medical image is the result of a number of different steps that occur during image acquisition, processing, and display image contrast Radiograhic contrast detector contrast display contrast Elemental Composition of subject Subject mass attenuation coefficient Electron density Physical density thickness Incident X spectrum Window and level Viewing factors Viewing human factors surrounding factors Gee David 入射 X線能譜對(duì)物體（ X線）對(duì)比度的影響 431mc ZA???Gee David Gee David Contrast Resolution ? （ contrast resolution） 是指當(dāng)細(xì)節(jié)與背景之間具有低對(duì)比度時(shí) ， 將一定大小的細(xì)節(jié)從背景中辨別出來(lái)的能力 。如冠狀面或矢狀面的重
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