Ⅹ照相与CT 普通X照相
X照相与CT 返回X射线 返回CT
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X-ray Film/Screen Cassette X-rays Film- Silver halide grains-tums black when exposed PncosensimvelEmusion to visible light- relatively insensitive to x-rays-1% Phosphor emits visible and UV light Airtight cassette Screens can increase sensitivity by a factor of 100 Screens decrease resolution
y Film/Screen Cassette- Mammography Film- Silver halide grains-tums black when expos PHotosensitive Emulsion to visible light- relatively insensitive to x-rays-1% Light sensitive screen- Phosphor emits visible and UV lig Airtight Cassette Screens can increase sensitivity by a factor of 100 Screens decrease resolution
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检测器 CT原理: X射线源 二二二 平移+旋转 旋转 射线入射强度1平移步 出射强度I 线性衰减系数u
CT原理： 平移+旋转 ◼ 射线入射强度I0 ◼ 出射强度I ◼ 线性衰减系数µ