Results The primitive group artifacts example number proportion is 18.45 %,the improvement group artifacts example number proportion is 4 %,obviously latter is lower than fo...

• 结果:原始组伪影例数比例为18.；45%25；改进组伪影例数比例为4%25；后者明显低于前者。结论:通过对二组病例研究；我们了解了伪影产生的原因及比较有效的消除手段。