Compared to the ordinary Ram p filter,with the quantitative Ramp filter,the mean counts of the slice increased about50 % . In the mean while the noise decreased about 30 % .

• 结果 :与普通的 ramp滤波函数相比 ；定量分析型所重建的图像平均计数提高约 5 0 %25 ；噪声降低约 30 %25 .