| 低剂量CT投影图像噪声分析及去噪算法研究 |
| |
| 引用本文： | 张元科.低剂量CT投影图像噪声分析及去噪算法研究[J].光电子．激光,2010(7):1073-1078. |
| |
| 作者姓名： | 张元科 |
| |
| 作者单位： | 西安电子科技大学计算机学院;第四军医大学计算机应用教研室; |
| |
| 基金项目： | 国家自然科学基金资助项目(30470490);国家自然科学基金重点资助项目(60933009) |
| |
| 摘 要： | 提高低剂量CT图像的信噪比(SNR)是使低剂量CT获得有效临床应用的关键。本文对低剂量CT投影数据噪声研究发现,在投影图像的某些区域中可能会存在一些孤立的噪声点,滤除这些孤立点后的投影数据近似服从非平稳高斯噪声分布。由此,提出一种低剂量CT图像降噪算法,包括"孤立点"检测与滤波(IDE),基于最大后验概率(MAP)的高斯噪声滤波及FBP重建过程。计算机仿真以及真实数据实验表明,本文提出的去噪算法获得的重建CT图像,SNR及视觉效果均有明显的提高。
|
| 关 键 词： | 低剂量CT 图像去噪 孤立点 最大后验概率(MAP) |
Noise analysis and noise reduction for low-dose CT sinogram |
| |
| ZHANG Yuan-ke.Noise analysis and noise reduction for low-dose CT sinogram[J].Journal of Optoelectronics·laser,2010(7):1073-1078. |
| |
| Authors: | ZHANG Yuan-ke |
| |
| Affiliation: | 1.College of Computer Application,Xi′an University of Electronics Science and Technology,Xi′an 710071,China;2.Department of Computer Application/BME,Fourth Military Medical University,Xi′an 710032,China) |
| |
| Abstract: | The improvement of the SNR of the low-dose CT image is a crucial issue for the low-dose CT application.As studied before,the noise in the calibrated and log-transformed projection data of low-mA(or low-dose) CT protocol follows approximately a non-stationary Gaussian distribution.In this study,we further demonstrate that some isolated noise points would not satisfy the above observation.Hence,we propose a noise reduction scheme for low-dose CT sinograms,which includes isolated datum detection and removal,MA... |
| |
| Keywords: | ow-dose CT noise reduction isolated datum maximum a posterior(MAP) |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《光电子．激光》浏览原始摘要信息 |
|
点击此处可从《光电子．激光》下载全文 |
