The noise analysis of CT imaging based on noise power spectrum of different reconstruction type
10.3969/J.ISSN.1672-8270.2017.04.007
- VernacularTitle:基于噪声功率谱的不同重建类型CT图像噪声分析
- Author:
Yuan YUAN
;
Dongsheng LU
;
Zhaohui ZHONG
- Keywords:
Noise power spectrum;
Noise;
Subjective evaluation;
Objective evaluation;
CT;
Image reconstruction;
Image quality
- From:
China Medical Equipment
2017;14(4):32-35
- CountryChina
- Language:Chinese
-
Abstract:
Objective: To evaluate the noise characteristic of different reconstruction type CT image by using the noise power spectrum (NPS), and analyze the correlation between this results and subjective vision noise evaluation. Methods: QA water phantom of CT equipment was scanned and 8 common reconstruction algorithms were applied to dispose image. NPS peak value, the peak frequency and standard deviation (SD) were compared with the subjective evaluation measurements, such as granularity, contrast, sharpness and optical noise level, by using the correlation analysis. Results: Each reconstruction algorithm owned different peak value and peak frequency. Granularity negatively correlated with the peak frequency. A positive correlation was found between contrast and peak value. Sharpness was positively correlated with both peak value and peak frequency. All of the subjective evaluation measurements were correlated with SD. Conclusion: Comparing with SD, NPS can reflect both intensity and morphological feature of the noise and possess applicative potential as a more comprehensive evaluation index.
