Application value of low-dose low-radiation manual trigger technique in CT pulmonary artery angiography(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2020年第12期
- Page:
- 1490-1493
- Research Field:
- 医学放射物理
- Publishing date:
Info
- Title:
- Application value of low-dose low-radiation manual trigger technique in CT pulmonary artery angiography
- Author(s):
- LI Liqiang; ZHANG Zhenming; DONG Xianfeng; YIN Xiaoxia; ZENG Fanxue; DU Xiaoxui; WANG Haibin
- Department of Medical Imaging, Luanzhou City Peoples Hospital, Luanzhou 063700, China
- Keywords:
- pulmonary embolism CT pulmonary artery angiography low-tube voltage contrast agent radiation dose
- PACS:
- R811.1
- DOI:
- DOI:10.3969/j.issn.1005-202X.2020.12.003
- Abstract:
- Objective To investigate the application value of low-dose low-radiation manual trigger technique in CT pulmonary artery angiography (CTPA). Methods 90 patients with suspected pulmonary embolism (PE) were randomly divided into regular group (n=45) and low-dose group (n=45). The regular group underwent conventional mode CTPA scanning (120 kV, 50 mL contrast agent), while the low dose group underwent low tube voltage and low dose CTPA scanning (80 kV or 100 kV, 30 mL contrast agent). The image quality and radiation dose of the two groups were compared. Results The CT value, SNR and CNR had no statistically significant differences between the two groups in pulmonary artery trunk and right lung S10 segment pulmonary artery (P>0.05). In the S1 pulmonary artery of the right lung, the CNR in regular group was significantly higher than that in the control group, and the difference has statistical significances (P<0.05). The two observers had excellent consistency on image quality analysis (Kappa=0.865, P<0.001). The values of CTDIvol, DLP and ED inregular group were (8.89±1.96) mGy, (296.5±78.4) mGy[?cm and (4.45±1.76) mSv respectively, which were significantly higher than those low-dose group with (3.12±0.68) mGy, (99.6±17.3) mGy[?cm and (1.09±0.27) mSv (P<0.05), and the ED value in low-dose group was reduced by about 76% compared with that in conventional group. Conclusion It is feasible to apply low dose and low radiation manual trigger technology to CTPA, for it can effectively reduce radiation dose and contrast agent dosage and improve examination safety while obtaining image quality meeting diagnostic requirements.
Last Update: 2020-12-30