非线性融合技术在头颈部CTA中的价值:体模实验
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摘要
目的探讨双源双能量CT非线性融合(NLB)技术提高头颈部CTA图像质量、降低辐射剂量的应用价值。方法分别以常规120kV(螺距为1.0)及双能量80/Sn140kV(螺距分别为0.5、0.8、1.0和1.2)对人体头颈部仿真体模进行扫描,并对双能量扫描数据进行线性融合(LB)和NLB处理。比较9组图像颈内动脉、大脑中动脉的CT值、CNR和图像质量主观评分的差异;比较不同扫描条件下辐射剂量的差异。结果螺距为0.5、0.8、1.0、1.2的NLB图像中,大脑中动脉和颈内动脉的CT值大于螺距为0.5、0.8、1.0、1.2的LB图像和常规120kV图像(P均<0.05)。螺距为0.5和0.8的NLB图像中,大脑中动脉和颈内动脉的CNR大于螺距为1.0、1.2的NLB图像,螺距为0.5、0.8、1.0、1.2的LB图像和常规120kV图像(P均<0.05)。主观评价显示,双能量扫描螺距为0.5时,图像质量最佳;双能量扫描螺距为0.8时,LB、NLB图像与常规120kV图像评分相当。与常规120kV扫描方式比较,双能量扫描螺距为0.8、1.0和1.2时,有效剂量分别降低36.12%、46.28%和53.22%。结论 NLB技术可在保证头颈部CTA图像质量的同时降低辐射剂量。
Objective To explore the value of non-linear blending(NLB)technique in improving image quality and reducing radiation dose of head and neck CTA using phantom.Methods CT scanning with conventional single energy120 kV(pitch 1.0)and dual-energy 80/Sn140 kV(pitch 0.5,0.8,1.0 and 1.2)were performed on the head and neck of a phantom,respectively.The dual energy images were reconstructed with both NLB method and linear blending(LB)method.CT value and CNR of the internal carotid artery(ICA)and middle cerebral artery(MCA)were measured and calculated.The image quality of each group were evaluated,and the radiation dose was compared.Results CT value of ICA and MCA in NLB imaging with pitch of 0.5,0.8,1.0,1.2 was larger than that in LB images with pitch of 0.5,0.8,1.0,1.2 and conventional 120 kV images(all P<0.05).CNR of ICA and MCA in NLB images with the pitch of 0.5 and0.8 was larger than that in NLB images with the pitch of 1.0 and 1.2,LB images with pitch of 0.5,0.8,1.0,1.2 and conventional 120 kV images(all P<0.05).The subjective evaluation showed that the image quality of dual-energy images with the pitch of 0.5 was the best.The image quality of dual-energy images with pitch of 0.8 was equal to that of the conventional 120 kV images.Compared with conventional 120 kV scanning,the effective dose of dual-energy scanning with the pitch of 0.8,1.0 and 1.2 reduced by 36.12%,46.28% and 53.22%,respectively.Conclusion NLB technology can reduce the radiation dose while ensuring the quality of CTA image of head and neck.
Objective To explore the value of non-linear blending(NLB)technique in improving image quality and reducing radiation dose of head and neck CTA using phantom.Methods CT scanning with conventional single energy120 kV(pitch 1.0)and dual-energy 80/Sn140 kV(pitch 0.5,0.8,1.0 and 1.2)were performed on the head and neck of a phantom,respectively.The dual energy images were reconstructed with both NLB method and linear blending(LB)method.CT value and CNR of the internal carotid artery(ICA)and middle cerebral artery(MCA)were measured and calculated.The image quality of each group were evaluated,and the radiation dose was compared.Results CT value of ICA and MCA in NLB imaging with pitch of 0.5,0.8,1.0,1.2 was larger than that in LB images with pitch of 0.5,0.8,1.0,1.2 and conventional 120 kV images(all P<0.05).CNR of ICA and MCA in NLB images with the pitch of 0.5 and0.8 was larger than that in NLB images with the pitch of 1.0 and 1.2,LB images with pitch of 0.5,0.8,1.0,1.2 and conventional 120 kV images(all P<0.05).The subjective evaluation showed that the image quality of dual-energy images with the pitch of 0.5 was the best.The image quality of dual-energy images with pitch of 0.8 was equal to that of the conventional 120 kV images.Compared with conventional 120 kV scanning,the effective dose of dual-energy scanning with the pitch of 0.8,1.0 and 1.2 reduced by 36.12%,46.28% and 53.22%,respectively.Conclusion NLB technology can reduce the radiation dose while ensuring the quality of CTA image of head and neck.
引文
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[15]赵雯,韩丹,黄益龙,等.双能量非线性融合优化对比技术对甲状腺结节图像质量的影响.中国医学影像技术,2016,32(5):785-789.
[16]Holmes DR 3rd,Fletcher JG,Apel A,et al.Evaluation of nonlinear blending in dual-energy computed tomography.Eur JRadiol,2008,68(3):409-413.
[17]黄益龙,韩丹,赵雯,等.双能CT非线性融合技术提高头颅CTA图像质量的临床应用.中国医学影像技术,2016,32(8):1267-1271.
[18]Forget TR Jr,Benitez R,Veznedaroglu E,et al.A review of size and location of ruptured intracranial aneurysms.Neurosurgery,2001,49(6):1322-1325.
[2]Li SL,Wang CQ,Jiang XC,et al.Effects ofdual-energy CT with nonlinear blending on abdominal CTangiography.Korean J Radiol,2014,15(4):430-438.
[3]Lv P,Liu J,Wu R,et al.Use of non-linear image blending with dual-energy CT improves vascular visualization in abdominal angiography.Clin Radiol,2014,69(2):e93-e99.
[4]Wang Q,Gaofeng S,Xueli F,et al.Comparative study of hepatic venography using non-linear-blending images,monochromatic images and low-voltage images of dual-energy CT.Br J Radiol,2014,87(1042):20140220.
[5]Wang Q,Shi G,Liu X,et al.Optimal contrast of computed tomography portal venography using dual-energy computed tomography.J Comput Assist Tomogr,2013,37(2):142-148.
[6]Scholtz JE,Hüsers K,Kaup M,et al.Non-linear image blending improves visualization of head and neck primary squamous cell carcinoma compared to linear blending in dual-energy CT.Clin Radiol,2015,70(2):168-175.
[7]曹建新,王一民,杨诚,等.双源CT双能量融合图像显示肝癌病灶.中国医学影像技术,2012,28(9):1690-1694.
[8]Mileto A,Ramirez-Giraldo JC,Marin D,et al.Nonlinear image blending for dual-energy MDCT of the abdomen:Can image quality be preserved if the contrast medium dose is reduced.AJRAm J Roentgenol,2014,203(4):838-845.
[9]刘杰,高剑波,张永高,等.双源CT非线性融合技术联合低流率注射对比剂行主动脉成像的可行性.中华放射学杂志,2014,48(6):505-506.
[10]Liu J,Lv PJ,Wu R,et al.Aortic dual-energy CT angiography with low contrast medium injection rate.J Xray Sci Technol,2014,22(5):689-696.
[11]ApelA,Fletcher JG,Fidler JL,et al.Pilot multi-reader study demonstrating potential for dose reduction in dual energy hepatic CT using non-linear blending of mixed kV image datasets.Eur Radiol,2011,21(3):644-652.
[12]Menzel H,Schibilla H,Teunen D.Guidelines on radiation dose on the patient.European Guidelines on Quality Criteria for Computed Tomography.Amsterdam:Elsevier Science Publishers,2006:32-32.
[13]黄益龙,韩丹,金弋人,等.双源双能头颅CTA非线性融合系数的优化选择.临床放射学杂志,2016,35(12):1893-1897.
[14]Wang D,Zhang Q,Hu H,et al.Optimal contrast of cerebral dual-energy computed tomography angiography in patients with spontaneous subarachnoid hemorrhage.Comput Assist Tomogr,2016,40(1):48-52.
[15]赵雯,韩丹,黄益龙,等.双能量非线性融合优化对比技术对甲状腺结节图像质量的影响.中国医学影像技术,2016,32(5):785-789.
[16]Holmes DR 3rd,Fletcher JG,Apel A,et al.Evaluation of nonlinear blending in dual-energy computed tomography.Eur JRadiol,2008,68(3):409-413.
[17]黄益龙,韩丹,赵雯,等.双能CT非线性融合技术提高头颅CTA图像质量的临床应用.中国医学影像技术,2016,32(8):1267-1271.
[18]Forget TR Jr,Benitez R,Veznedaroglu E,et al.A review of size and location of ruptured intracranial aneurysms.Neurosurgery,2001,49(6):1322-1325.