中华放射医学与防护杂志

李树荣,万芸,周淑琴,等.低辐射多层CT肺动脉成像:低管电压结合个体化低管电流设置[J].中华放射医学与防护杂志,2013,33(2):194-197.LI Shu-rong,WAN Yun,ZHOU Shu-qin,et al.Low-dose MSCT pulmonary angiography: low kVp with individual-adapted low tube current[J].Chin J Radiol Med Prot,2013,33(2):194-197

低辐射多层CT肺动脉成像:低管电压结合个体化低管电流设置

Low-dose MSCT pulmonary angiography: low kVp with individual-adapted low tube current

投稿时间：2012-09-22

DOI：10.3760/cma.j.issn.0254-5098.2013.02.022

中文关键词: 低剂量肺动脉血管造影术体层摄影术 X射线计算机

英文关键词:Low-dose Pulmonary artery Angiography Tomography X-ray computed

基金项目:广东省自然科学基金(8151008901000210)

作者	单位	E-mail
李树荣	510080 广州,中山大学附属第一医院放射科
万芸	广东省中医院影像科
周淑琴	广东省中医院影像科
严超贵	510080 广州,中山大学附属第一医院放射科
高樱	510080 广州,中山大学附属第一医院放射科
周旭辉	510080 广州,中山大学附属第一医院放射科	xiaolintongqq@126.com

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中文摘要:

目的探讨多层螺旋CT肺动脉成像(MSCTPA)中应用低管电压(kVp)结合个体化管电流设置减低辐射剂量的可行性。方法连续56例拟行MSCTPA的患者纳入研究,用SPSS产生的随机数随机分为2组:A组27例,采用120 kVp和100 mAs;B组29例,采用100 kVp并根据患者体重个体化调节管电流输出(约1.0 mAs/kg),B组分别采用标准算法(FC13,B1组)和降噪算法(FC11,B2组)重建图像。比较辐射剂量及图像质量。结果 B组的容积CT剂量指数(CTDI_vol)、剂量长度乘积(DLP)、有效吸收剂量(E)均数分别为5.1 mGy、83.3 mGy·cm和1.4 mSv,与A组比较,分别下降了64.3%、66.4%和66.7%(F=32.57, 12.32,11.98,P＜0.05)。与A组比较,B1组图像噪声增加了118.2%(t=10.05,P＜0.05),中央肺动脉和周围肺动脉的信噪比(SNR)与对比噪声比(CNR)及主观评分均值分别降低了51.5%、46.6%、50.8%、45.3%和20.4%( t=7.20、 6.30、 6.58、 5.54、 8.35, P＜0.05)。与B1组比较,B2组图像噪声又减低了32.5%(t=6.12, P＜0.05),中央肺动脉和周围肺动脉的SNR与CNR及主观评分均值分别增加46.2%、46.2%、45.9%、46.9%和18.4%( t=3.19、 3.55、 2.95、 3.37、 5.42,P＜0.05)。与A组比较,B2组图像噪声增加47.3%(t=4.03, P＜0.05),中央肺动脉和周围肺动脉的SNR与CNR及主观评分均值分别降低29.1%、21.8%、28.2%、19.6%和8.2%( t=4.06、 2.82、 3.68、 2.22、 3.02, P＜0.05)。结论在保证良好图像质量情况下,MSCTPA中应用低kVp(100 kV)结合个体化管电流输出设置(约1.0 mAs/kg)可以显著降低辐射剂量。

英文摘要:

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 CTDI_vol, 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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