最佳ASIR联合能谱单能量成像对腹部增强及血管图像质量的优化研究

发布时间：2018-07-07 08:44

本文选题：能谱CT + CT血管成像　；参考：《临床放射学杂志》2017年02期

【摘要】：目的探讨最佳自适应统计迭代重建(ASIR)百分比联合最优单能量技术提高腹部图像质量,优化腹部血管显示。方法搜集临床腹部能谱CT检查的32例腹部疾病患者资料,应用能谱分析软件,采用70 ke V、55ke V分别联合0%、30%、50%、70%ASIR模式进行腹部动脉期及门静脉期重建,比较70 ke V联合不同ASIR百分比模式下动脉期及门静脉期肝实质噪声(LN)、胰腺噪声(PN),竖脊肌噪声(SMN)以及肝CNR(LCNR)、胰腺CNR(PCNR)、门静脉CNR(PV-CNR)及主观图像质量评分之间差异有无统计学意义。同时比较55 ke V联合不同ASIR百分比模式下动脉期及门静脉期腹部动脉血管、门静脉CNR等相关指标及主观图像质量评分,并采用单因素方差分析进行比较。结果 70 ke V组不同ASIR比例中,LN、PN,SMN、LCNR及PCNR差异均有统计学意义(P0.05)。主观图像质量评分显示动脉期及静脉期不同ASIR组间比较,30%组伪影最低;诊断信心度方面30%最高;噪声方面70%最低,微小结构及病变显示方面各ASIR组间无统计学差异。55 ke V组间,除了动脉期LCNR各组间差异无统计学意义,腹部各动脉血管CNR及PV-CNR,LN,SMN,PN,主观评分及门静脉期LCNR在不同ASIR组间差异均有统计学意义(P0.05);主观评分方面以50%ASIR组最优(P0.05)。结论 70 ke V+30%ASIR及55ke V+50%ASIR分别成为优化腹部图像质量及血管成像的最优化组合。
[Abstract]:Objective to investigate the optimal adaptive statistical iterative reconstruction (ASIR) percentage combined with the optimal single energy technique to improve the abdominal image quality and optimize the abdominal vascular display. Methods the data of 32 patients with abdominal diseases examined by clinical EDS CT were collected. The reconstruction of abdominal artery and portal vein was carried out by using 70ke V 55ke V combined with the model of 0 ~ 30 ~ 50 ~ (50) and 50 ~ (70) ASIR, respectively, in the abdominal arterial phase and portal vein phase. There were significant differences in hepatic parenchymal noise (LN), pancreatic noise (PN), vertical spinal muscle noise (SMN), hepatic CNR (LCNR), pancreatic CNR (PCNR), portal vein CNR (PV-CNR) and subjective image quality score between 70 ke V and different ASIR percent models. At the same time, the relative indexes and subjective image quality scores of abdominal artery and portal vein CNR in 55 Kev combined with different ASIR percentage models were compared by single factor analysis of variance (ANOVA). Results in 70 ke V group, there were significant differences in LNN PNN SMMNN LCNR and PCNR among different ASIR ratios (P0.05). Subjective image quality score showed that 30% group had the lowest artifact, 30% had the highest diagnostic confidence, 70% had the lowest noise, and there was no statistical difference among ASIR group in microstructure and lesion display. In addition to the arterial phase of LCNR there was no significant difference among the groups. There were significant differences in subjective score and portal phase LCNR between different ASIR groups (P0.05); the subjective score in 50 ASIR group was the best (P0.05). Conclusion 70 ke V 30 and 55ke V 50 ASIR are the optimal combinations for optimizing abdominal image quality and vascular imaging, respectively.
【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;
【基金】：2015年河北省科技计划项目(编号:15277740D) 2014年河北省医学科学研究重点课题项目(编号:ZD20140443) 2015年河北省政府资助临床医学优秀人才培养项目(编号:361007) 河北大学附属医院青年基金项目(编号:2015Q001)
【分类号】：R816.5

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