自动协议选取能谱联合自适应迭代计算法重建技术降低腹部增强及血管成像辐射剂量及对比剂剂量的可行性

发布时间：2018-02-08 14:46

本文关键词： 腹部体层摄影术 X线计算机血管造影术图像处理计算机辅助自适应迭代算法重建辐射剂量　出处：《中国医学影像技术》2017年04期 　论文类型：期刊论文

【摘要】：目的探讨利用自动协议选取能谱(ASIS)扫描模式联合自适应迭代算法重建(ASiR)技术降低腹部增强及血管成像辐射剂量及对比剂剂量的可行性。方法将64例接受腹部增强患者随机分为两组:试验组32例,采用ASIS扫描模式,应用30%ASiR和50%ASiR重建算法;对照组32例,采用120kVp管电压,FBP重建。比较两组扫描方法辐射剂量及对比剂剂量;比较70keV+30%ASiR图像与对照组动脉期及门静脉期肝脏及胰腺噪声、竖脊肌噪声(SMN)、肝脏CNR、胰腺CNR;对55keV+50%ASiR图像与对照组动脉期腹主动脉及各主要分支血管CNR及门静脉期门静脉CNR以及血管图像主观评分进行统计学分析。结果试验组动脉期及门静脉期的CTDIvol、DLP较对照组下降23.68%、23.57%和25.59%、18.45%,对比剂注射总量试验组较对照组减少16.86%。70keV+30%ASiR动脉期及门静脉期肝脏、胰腺和竖脊肌的噪声均低于对照组(P均0.05)。试验组55keV+50%ASiR动脉期腹主动脉、肠系膜上动脉、腹腔干的CNR均高于对照组(P均0.05);静脉期门静脉的CNR和血管评分与对照组比较差异无统计学意义(P0.05)。结论采用ASIS扫描模式联合ASiR技术,70keV+30%ASiR及55keV+50%ASiR图像显示腹部脏器及腹部血管图像质量均优于传统120kVp扫描模式的图像质量,且降低了辐射剂量及对比剂剂量。
[Abstract]:Objective to explore the feasibility of reducing abdominal enhancement and angiographic radiation dose and contrast agent dose by using automatic protocol selective energy spectrum (ASIS) scanning mode combined with adaptive iterative algorithm to reconstruct ASiR.The methods 64 cases received abdominal enhancement. The patients were randomly divided into two groups: the experimental group (n = 32), Using ASIS scan mode, 30 Asir and 50 Asir reconstruction algorithms were used, and 32 cases in control group were reconstructed with 120kVp voltage tube. The radiation dose and contrast agent dose were compared between the two groups. The noise of liver and pancreas was compared between 70 keV 30 and 30% Asir images in comparison with the control group in arterial phase and portal vein phase. SMMN, CNR, CNR of liver, CNR of pancreas, 55 keV 50 Asir images were statistically analyzed with CNR of abdominal aorta and its main branches in the control group, portal vein CNR in portal vein and subjective scores of vascular images in the experimental group. Compared with the control group, the DLP of CTDIvola decreased 23.68% and 25.59% respectively in the vein phase and portal vein phase. The total dose of contrast agent injection decreased 16.86.70keV 30ASiR arterial phase and portal vein phase compared with the control group, and compared with the control group, the total dose of CTDIvola decreased by 16.86.70keV30ASiR and the liver in the portal vein phase. The noise of pancreas and erector spinal muscle were lower than that of control group (P < 0.05). The abdominal aorta and superior mesenteric artery of Asir artery were 55 Kev and 50 Kev in the experimental group. CNR in the celiac trunk was significantly higher than that in the control group (P < 0.05), and there was no significant difference in CNR and blood vessel scores between the venous portal vein and the control group (P < 0.05). Conclusion ASIS scan mode combined with ASiR technique is used to display abdominal viscera with 70 Kev 30 ASiR and 55 keV 50 ASiR images. The image quality of abdominal vessels was superior to that of traditional 120kVp scan mode. The radiation dose and contrast agent dose were decreased.
【作者单位】：河北大学附属医院CT/MRI诊断室;河北医科大学第二医院医学影像科;GE中国CT影像研究中心;
【基金】：2014年河北省医学科学研究重点课题计划(ZD20140443) 2015年河北省科技计划项目(15277740D) 2015年河北省财政厅政府资助临床医学优秀人才培养项目计划(361007) 2015年河北大学肿瘤医院基金项目(2015Q001)
【分类号】：R816.5

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