| LI Shu-rong,WAN Yun,ZHOU Shu-qin,YAN Chao-gui,GAO Ying,ZHOU Xu-hui.Low-dose MSCT pulmonary angiography: low kVp with individual-adapted low tube current[J].Chinese Journal of Radiological Medicine and Protection,2013,33(2):194-197 |
| Low-dose MSCT pulmonary angiography: low kVp with individual-adapted low tube current |
| Received:September 22, 2012 |
| DOI：10.3760/cma.j.issn.0254-5098.2013.02.022 |
| KeyWords:Low-dose Pulmonary artery Angiography Tomography X-ray computed |
| FundProject:广东省自然科学基金(8151008901000210) |
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| Abstract:: |
| Objective To assess the feasibility of low-dose MDCT pulmonary angiography (MDCTPA) by using low kVp combined with individual-adapted low tube current protocol and noise reduction filter algorithms. Methods Fifty-six consecutively patients with MDCTPA were enrolled in the study. The patients were randomly divided into group A (120 kVp, 100 mAs) and group B (100 kVp, individual-adapted tube current about 1.0 mAs/kg). Two series of images were reconstructed in group B: B1 with standard filter algorithms (FC13,B1) and B2 with noise reduction filter algorithms (FC11,B2). The image noise, quality and radiation dose in two groups were compared. Results The CTDIvol, DLP and E of group B were 5.1 mGy, 83.3 mGy·cm and 1.4 mSv respectively, which were reduced by 64.3%,66.4% and 66.7%, respectively(F=32.57, 12.32, 11.98,P＜0.05)when compared with those in group A. Compared with group A, the image noise in B1 was increased by 118.2%(t=10.05 P＜0.05), the central and peripheral SNR and CNR and scores were increased by 51.5%, 46.6%, 50.8%, 45.3% and 20.4%, respectively(t=7.20, 6.30, 6.58, 5.54, 8.35, P＜0.05). Compared with B1, the image noise in B2 was reduced by 32.5%(t=6.12, P＜0.05), the central and peripheral SNR and CNR and scores were increased by 46.2%,46.2%,45.9%,46.9% and 18.4%(t=3.19, 3.55, 2.95, 3.37, 5.42, P＜0.05). Compared with group A, the image noise in B2 group was increased by 47.3%(t=4.03, P＜0.05), the central and peripheral SNR and CNR and scores were reduced by 29.1%, 21.8%, 28.2%, 19.6% and 8.2%(t=4.06, 2.82, 3.68, 2.22, 3.02, P＜0.05). Conclusions Keeping effective diagnostic image quality, the protocol with low kVp and individual-adapted low tube current for low-dose MDCT pulmonary angiography would be effective and feasible, and the radiation dose would be significantly reduced. |
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