摘要
目的通过比较80 k Vp与120 k Vp管电压下双下肢CT血管成像(CTA)扫描的辐射剂量、图像质量,评价低管电压下腹主动脉及下肢动脉CTA扫描的可行性。方法回顾性研究40例患者,随机分成两组,每组20人,分别使用80 k Vp或120 k Vp管电压进行腹主动脉及双下肢动脉CTA扫描,通过定性和定量评价轴位、三维重建图像,并进行Shapiro-Wilk Normal分布检验和独立样本t检验。通过测量腹主动脉、双侧髂总动脉、股总动脉、股浅动脉、腘动脉和胫腓干的CT值并计算对比噪声比(CNR),并评价图像质量。结果 80 k Vp管电压组的血管CT值在538 HU至605 HU,高于120 k Vp管电压组。两组之间的CNR和定性评价没有差异。80 k Vp管电压组的DLP为(203±22)m Gy·cm,120 k Vp管电压组为(780±85)m Gy·cm,有效剂量下降了74%。结论低管电压联合自动管电流调节技术进行腹主动脉及双下肢动脉CTA扫描时可以在降低辐射剂量的同时保证图像质量。
Objective To compare radiation dose and image quality of abdominal aorta and lower extremity artery CTA under 80 kVp and 120 kVp, so as to evaluate the feasibility of low tube voltage abdominal aorta and lower ex- tremity artery CTA. Methods Totally 40 patients who were divided into two groups with 80 kVp or 120 kVp tuber voltage separately received abdominal aorta and lower extremity CTA. The objective and subjective evaluations were done based on axial and 3D reconstruction images. The data was analyzed by Shapiro-WilkNormal distribution test and independent t test. Results The CT number of arteries under 80 kVp tube voltage was between 538 HU to 605 HU, which were much higher than that under 120 kVp tube voltage. There were no statistical difference between CNR and objective evaluation between the two groups. The DLP of 80 kVp tube voltage was （203 ±22） mGy ·cm, and which was （780 ± 85） mGy · cm of 120 kVp tube voltage. The DLP decreased 74%. Conclusions The image quality of abdominal aorta and lower extremity artery CTA under 80 kVp tube voltage with ATCM may meet the need of clinical diagnose.
出处
《基础医学与临床》
CSCD
2016年第8期1135-1138,共4页
Basic and Clinical Medicine
