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| Application Value of Spiral CT Pulmonary Angiography with Low Radiation Dose and Low Dose Contrast Agent |
| XIE Hui, QIN Chuan, DENG Xiaolin, et al |
| Dazu County District People's Hospital in Chongqing, Chongqing Dazu 402360, China |
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Abstract Objective: To investigate the application value of spiral CT pulmonary angiography with low radiation dose and low dose contrast agent. Methods: Fifty-six patients received spiral CT pulmonary angiography in our hospital from May 2015 to May 2016 were selected as the research objects. All of the patients were randomly assigned into routine scan group (n=28) and double low dose scan group (n=28). Toshiba ONE Aquilion 320 slice spiral CT was used to check, the routine scan group (120kv, Omnipaque 350mgI/ml), the double low dose scan group (100kV, Visipaque 270mgI/ml), the other parameters were the same. The following parameters of two groups were compared: the CT values of each segment of the pulmonary artery, the values of noise, the signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR), the quality of the pictures, the CT dose index (CTDIvol), dose length product (DLP), effective radiation dose (ED) and iodine intake. Results: The CT values of each segment of the pulmonary artery of two groups had no significant difference (P>0.05). The values of SD [(7.7±2.1) vs (8.3±2.4)], SNR [ (23.9±7.3) vs (25.1±7.8)], CNR[(24.9±6.6) vs (27.1±7.2)], and the scores of picture quality [(4.1±0.8) vs (3.8±0.8)] of two groups had no difference (P<0.001). The CTDIvol [(6.1±0.4) vs (8.4±0.6)mGy], DLP [(293.4±21.7) vs (391.5±33.2) mGy.cm], ED [(4.3±0.4) vs (5.7±0.6)mSv/mGy.cm] and Iodine intake [(6.2±0.9) vs (8.3±1.1)g] of the double low dose scan group were lower than the routine scan group (P<0.001). Conclusion: Spiral CT with low radiation dose and low dose contrast agent can get good picture quality and meet the needs of clinical diagnosis, but also significantly reduce the radiation and iodine intake.
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2017, Vol. 23 
