南方医科大学学报

南方医科大学学报 ›› 2013, Vol. 33 ›› Issue (09): 1299-.

• • 上一篇    下一篇

正常剂量扫描导引的低剂量心血管CT造影图像恢复

张蕴婉，刘洋，黄静，曾栋，边兆英，张华，马建华   

  • 出版日期:2013-09-20 发布日期:2013-09-20

Low-dose CT angiography image restoration using normal dose scan-induced non-local means algorithm

  • Online:2013-09-20 Published:2013-09-20

PDF

1168

摘要： 目的探讨如何在保证诊断用心血管CT造影（CTA）图像质量的前提下降低X射线辐射剂量的最佳方法。方法本文利用
先前正常剂量扫描导引的非局部平均（ndiNLM）方法，结合先前正常剂量扫描的心血管CTA高质量图像，对当前低剂量扫描的
心血管CTA图像进行恢复。结果仿真和临床心血管CTA数据实验表明，同传统非局部平均方法（NLM）相比，ndiNLM方法在
抑制CTA图像噪声与伪影的同时，还可以实现心血管增强结构信息的优质保持。结论ndiNLM方法可为CTA成像中的辐射剂
量降低提供有力的方法学支撑。

Abstract: Objective To minimize of the radiation dose of cardiovascular CT angiography (CTA) imaging while preserving the
image quality. Methods To reduce the radiation dose in CTA imaging, the normal-dose scan induced non-local means
(ndiNLM) algorithm was adapted for low-mAs scanned CTA image restoration by using the previous scanned high-quality
image. Results Qualitative and quantitative evaluations were carried out on both simulated phantom and clinical CTA scans
in terms of accuracy and resolution properties. Compared to the original NLM algorithm, the ndiNLM method could achieve
noticeable gains in terms of noise-induced artifacts suppression and enhanced structure preservation. Conclusion The
ndiNLM algorithm is a potential useful technique to reduce the radiation dose in CTAimaging.