Effects of low-dose contrast agent combined with different voltage on image quality of CT pulmonary angiography(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2020年第11期
- Page:
- 1389-1393
- Research Field:
- 医学影像物理
- Publishing date:
Info
- Title:
- Effects of low-dose contrast agent combined with different voltage on image quality of CT pulmonary angiography
- Author(s):
- YIN Xiaoxia; ZHANG Zhenming; DONG Xianfeng; LI Liqiang; ZENG Fanxue; DU Xiaorui; WANG Haibin
- Department of Medical Imaging, Luanzhou Peoples Hospital, Luanzhou 063700, China
- Keywords:
- Keywords: pulmonary embolism CT pulmonary angiography contrast agent tube voltage
- PACS:
- R811.1
- DOI:
- DOI:10.3969/j.issn.1005-202X.2020.11.009
- Abstract:
- Abstract: Objective To observe effects of low-dose contrast agent combined with different voltage on image quality of CT pulmonary angiography (CTPA). Methods 90 suspected cases of pulmonary embolism in Luanzhou Peoples Hospital from January 2016 to May 2018 were sampled and conducted CTPA to confirm the diagnosis. The sample was divided into group A, B and C by random number table method. Group A was given 120 kV voltage and 50 mL contrast agent, group B 100 kV voltage and 50 mL contrast agent, and group C 80 kV voltage and 30 mL contrast agent. The automatic tube current modulation technique was applied to set different tube currents for the three groups, and the other parameters are invariant. The different image qualities and radiation doses were finally identified in the three groups. Results CT values of pulmonary artery trunk, left & right pulmonary artery, and pulmonary artery segment in group B and C were significantly higher than those in group A, while signal noise ratio and contrast noise ratio were significantly lower than those in group A (P<0.05). All the three groups subjective scores of image quality have reached 3 to 6 points, and there was no statistically significant difference (P>0.05). After scan, actual volume CT dose index and dose-length product and effective dose in group B and group C were significantly lower than those in group A (P<0.05). Conclusion Compared with traditional scan conditions, CTPA of low-dose contrast agent combined with low-tube voltage (80 kV) can ensure the image quality and reduce the radiation dose with a significant reduction of contrast agent dose.
Last Update: 2020-12-02