Effects of iterative reconstruction in image space on the quality of abdominal CT plain scan image and radiation dose(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2018年第10期
- Page:
- 1169-1172
- Research Field:
- 医学影像物理
- Publishing date:
Info
- Title:
- Effects of iterative reconstruction in image space on the quality of abdominal CT plain scan image and radiation dose
- Author(s):
- WU Mingqun; YANG Congling; GAO Hongxia
- CT Room, the Central Hospital of Liaoyang City, Liaoyang 111000, China
- Keywords:
- ; Keywords: computed tomography; image space; iterative reconstruction algorithm; image quality; radiation dose
- PACS:
- R318.6
- DOI:
- DOI:10.3969/j.issn.1005-202X.2018.10.011
- Abstract:
- Abstract: Objective To explore the effects of iterative reconstruction in image space (IRIS) on the quality of abdominal CT plain scan image and radiation dose. Methods A total of 150 patients who underwent abdominal CT plain scan in the Central Hospital of Liaoyang City between January 2017 and April 2018 were selected as subjects. The patients were randomly divided into observation group and control group, with 75 cases in each group. The scans were performed by automatic milliampere control technique, with a tube voltage of 130 kV. In observation group, the preset image quality reference milliampere second was 150 mAs, and IRIS was performed; in control group, the preset image quality reference milliampere second was 250 mAs, and filtered back projection (FBP) reconstruction was performed. The quality of two groups of images was objectively evaluated with CT value, image noise SD, signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR). Meanwhile, the subjective evaluation of image quality was performed. The volume CT dose indexes in both groups were recorded. Results The image noise SD of the liver and spleen in observation group was significantly lower than that in control group, while the SNR was significantly higher than that in control group (P<0.05). No statistical differences were found in CT value, CNR and the subjective score of overall quality between the two groups (P>0.05). The volume CT dose index in observation group was (10.02±2.85) mGy, significantly lower than (15.68±4.36) mGy in control group (P<0.05). Conclusion IRIS can not only ensure the quality of CT plain scan images, but also effectively reduce the radiation dose.
Last Update: 2018-10-23