高级迭代重建算法在双低主动脉CTA中的应用研究
摘要
目的探讨双源CT迭代重建算法在双低主动脉CTA中的应用潜能。方法采用随机分组法将108例临床要求行全主动脉CTA扫描的患者分为实验组(A)和对照组(B),A组(n=52):采用80kV,造影剂用量为0.7 mL/kg, B组(n=56):采用100 kV,造影剂用量为1.0 mL/kg,余扫描条件相同。两组图像均应用迭代重建(SAFIRE)与滤波反投影重建(FBP)两两比较,并对各组图像质量进行主观和客观评价:由两名高年资医师分别测量主动脉四个不同层面感兴趣区(ROI)的CT值、噪声(SD),对比噪声比(CNR)并对图像质量进行主观评分。结果 A组SAFIRE重建图像CT值、噪声、CNR优于B组FBP重建差异有统计学意义(P<0.05);而主观评分高于B组FBP重建差异无统计学意义(P>0.05);B组SAFIRE重建图像CT值、噪声、CNR优于A组SAFIRE重建差异有统计学意义(P<0.05),而主观评分高于A组SAFIRE重建差异无统计学意义(P>0.05);B组SAFIRE重建主观评分略高于B组FBP重建差异无统计学意义(P>0.05)。A组DLP(1.81±0.64) mGy.cm较B组DLP(5.48±0.23) mGy.cm辐射剂量减少67%,A组造影剂用量(48.54±12.04) mL较B组用量(67.02±13.47) mL减少28%。结论低电压联合迭代重建算法能够减少图像噪声,提高图像质量,降低辐射剂量、减少造影剂用量。
引文
[1] Silva AC,Lawder HJ,Hara A et al .Innovations in CT dose reduction strategy:application of the adaptive statistical iterative reconstruction algorithm.AJR Am J Roentgenol,2010,194(1):191-199.
[2] Hara AK,Paden RG,Silva AC,et al.Iterative reconstruction technique for reducing body radiation dose at CT:feasibility study.AJR Am J Roentgenol,2009,193(3):764- 771.
[3] 侯平,刘杰,蒋耀军等.超低剂量对比剂主动脉CTA检查联合单能量成像和ASIR技术的可行性[J].Heart,2010,96(12):933-938.
[4] Christian O,Chen J,Yang Z,et al.An improved index of image quality for task-based performance of CT iterative reconstruction across three commercial implementation[J].Radiology,2015,275(3):725-734.
[5] You J,Dai Y,Huang N et al.Low-dose computed tomography with adaptive statistical iterative reconstruction and low tube voltage in craniocervical computed tomographic angiography:impact of body mass index J Comput Assisit Tomogr,2015,39(5):774-780.
[6] 黄迪开,谭莉平,陆建常等.头颈部CT血管成像的辐射剂量分析[J].实用放射学杂志,2014[7]1235-1238.
[7] 杨立强,王小红,朱春等.双源CT双低技术在主动脉CTA的研究[J].临床放射学杂志,2015,34(8):1307-1309.
[8] Martinsen AC,Saeher HK,HOI PK,et al.Iterative reconstruction reduces abdominal CT dose[J].Eur J Radiol,2012,81(7):1483-1487.
[9] 曹国全,蔡志敏,陈勇春等.低管电压联合迭代重建算法对胸部CT血管造影图像质量及辐射剂量的影响[J].中华放射医学与防护杂志,2015,35(5):393-396.
[10] Nakaura T,Nakamura S,Maruyama N et al.Low contrast agent and radiation dose protocol for heptic dynamic CT of thin aduts at 256-detector row CT:effect of low tube voltage and hybrid iterative reconstruction alogorithm on image quality[J].Radiology,2012,264(2):445-454.
[11] 董霞,武志峰,鄂林宁等.双源CT大螺距扫描联合迭代重建在肺动脉成像中的应用研究.[J].中国临床医学影像杂志,2014,25:393-396.
[12] Zhao YX,Zuo ZW,Suo HN,et al.A comparison of the image quality and radiation dose using 100KVp combination of different noise index and 120KVp in computed tomography-pulmonary-angiography[J].JComputAssisitTomogr,2016,40(5):784-790.DOI:10.1097/RCT.0000000000000488
[13] Winklehner A,Karlo C,Puippe G,et al.Raw data-based iterative reconstruction in body CTA:evaluation of radiation dose saving potential[J].Eur Radiol,2011,21:2521-2526.
[14] 付传明,王忠平,徐霖等.低管电压与低对比剂碘量技术在主动脉CT血管造影中的可行性研究[J].中华放射医学与防护杂志,2015,35(4):313-315.
[15] Kanematsu M,Goshima S,Miyoshi T,et al.Whole-body CT angiography with low tube voltage and low-concentration contrast material to reduce radiation dose and Iodine load[J].Am J Roentgenol,2014,201(1):106-116.DOI:10.2214/AJR.13.10720.
[2] Hara AK,Paden RG,Silva AC,et al.Iterative reconstruction technique for reducing body radiation dose at CT:feasibility study.AJR Am J Roentgenol,2009,193(3):764- 771.
[3] 侯平,刘杰,蒋耀军等.超低剂量对比剂主动脉CTA检查联合单能量成像和ASIR技术的可行性[J].Heart,2010,96(12):933-938.
[4] Christian O,Chen J,Yang Z,et al.An improved index of image quality for task-based performance of CT iterative reconstruction across three commercial implementation[J].Radiology,2015,275(3):725-734.
[5] You J,Dai Y,Huang N et al.Low-dose computed tomography with adaptive statistical iterative reconstruction and low tube voltage in craniocervical computed tomographic angiography:impact of body mass index J Comput Assisit Tomogr,2015,39(5):774-780.
[6] 黄迪开,谭莉平,陆建常等.头颈部CT血管成像的辐射剂量分析[J].实用放射学杂志,2014[7]1235-1238.
[7] 杨立强,王小红,朱春等.双源CT双低技术在主动脉CTA的研究[J].临床放射学杂志,2015,34(8):1307-1309.
[8] Martinsen AC,Saeher HK,HOI PK,et al.Iterative reconstruction reduces abdominal CT dose[J].Eur J Radiol,2012,81(7):1483-1487.
[9] 曹国全,蔡志敏,陈勇春等.低管电压联合迭代重建算法对胸部CT血管造影图像质量及辐射剂量的影响[J].中华放射医学与防护杂志,2015,35(5):393-396.
[10] Nakaura T,Nakamura S,Maruyama N et al.Low contrast agent and radiation dose protocol for heptic dynamic CT of thin aduts at 256-detector row CT:effect of low tube voltage and hybrid iterative reconstruction alogorithm on image quality[J].Radiology,2012,264(2):445-454.
[11] 董霞,武志峰,鄂林宁等.双源CT大螺距扫描联合迭代重建在肺动脉成像中的应用研究.[J].中国临床医学影像杂志,2014,25:393-396.
[12] Zhao YX,Zuo ZW,Suo HN,et al.A comparison of the image quality and radiation dose using 100KVp combination of different noise index and 120KVp in computed tomography-pulmonary-angiography[J].JComputAssisitTomogr,2016,40(5):784-790.DOI:10.1097/RCT.0000000000000488
[13] Winklehner A,Karlo C,Puippe G,et al.Raw data-based iterative reconstruction in body CTA:evaluation of radiation dose saving potential[J].Eur Radiol,2011,21:2521-2526.
[14] 付传明,王忠平,徐霖等.低管电压与低对比剂碘量技术在主动脉CT血管造影中的可行性研究[J].中华放射医学与防护杂志,2015,35(4):313-315.
[15] Kanematsu M,Goshima S,Miyoshi T,et al.Whole-body CT angiography with low tube voltage and low-concentration contrast material to reduce radiation dose and Iodine load[J].Am J Roentgenol,2014,201(1):106-116.DOI:10.2214/AJR.13.10720.