IQON CT混合O-MAR技术实现颅底硬化束数据重建的可行性探讨  

The Feasibility of Reconstruction of Skull Base Sclerotic Bundle Data by Spectral Detection Scanner and O-MAR Technology

作　　者：马一鸣[1] 韩小伟 李茗[1] 胡安宁 荣萍 杨尚文[1] MA Yiming;HAN Xiaowei;LI Ming(Department of Radiology,Nanjing Drum Tower Hospital the Affliated Hospital of Nanjing University Medical School,Nanjing,Jiangsu Province 210018,P.R.China)

机构地区：[1]南京大学医学院附属南京鼓楼医院医学影像科,210018

出　　处：《临床放射学杂志》2022年第9期1770-1775,共6页Journal of Clinical Radiology

摘　　要：目的 比较头部双能CT光谱探测器获得的虚拟单能图像与常规多能CT扫描获得的混合能量图像的差异,在不影响图像质量条件下,得到抑制线束硬化伪影(BHAS)的最优keV值。方法 回顾性搜集采用光谱探测扫描仪(IQon Spectral CT)在40~140 keV范围进行扫描的70例患者,利用IQon CT每隔20 keV获得一次图像,共得到6组的不同单一能量图像,采用定性及定量分析法与常规CT混合能量图像分别比较。结果 定量分析法:keV越升高,O-MAR的信噪比(SNR)与对比噪声比(CNR)在额颞叶皮层和白质与第四脑室均升高,在枕叶灰白质区SNR与CNR呈现下降趋势,所有伪影指数(AI)均一致性降低,在同一keV能级参数设置下,NO-MAR组AI均低于O-MAR组,在80 keV出现数据的阈值平台期(P<0.01);同一keV的能级水平设置下,额颞叶与小脑半球及桥脑SNR的值O-MAR高于NO-MAR(P<0.01),当40~140 keV在第四脑室的SNR的值O-MAR高于NO-MAR,但100~140 keV无统计学差异(P>0.05),在枕叶皮层的SNR值在120 keV与140 keV的O-MRA高于NO-MRA(P<0.05),40~100 keV无统计学差异(P>0.05);在同一keV能级参数设置下额颞叶与小脑半球及桥脑CNR值O-MAR高于NO-MAR(P<0.01),但在第四脑室与枕叶皮层均无统计学意义(P>0.05)。体重、身高、体质量指数评分无统计学差异(t=9.068,P>0.05)。定性分析法:两位阅片者间对6组图像质量主观评估具有较好的一致性(k=0.97,P>0.05),O-MAR组图像评分优于NO-MAR组图像,在80 keV图像评分最高,平均分≥3,一致认为符合临床诊断的需求。结论 与常规CT多能图像相比,光谱探测器CT提供的单能量图像可以显示最佳的线束硬化伪影抑制水平,尤其在80 keV效果明显,能够在不影响图像质量情况下最大限度抑制线束硬化伪影。Objective To compare the difference between the virtual single energy image obtained by the head dual energy CT spectrum detector and the mixed energy image obtained by conventional multi-energy CT scanning.The optimal keV value for suppressing the beam hardening artifact(BHAS) is obtained without affecting the image quality. Methods Retrospectively collected 70 patients who were scanned in a range of 40~140 keV using a spectral scanner(IQon Spectral CT).Using IQon CT to get images every 20 keV.6 groups of different single energy images were obtained. Qualitative and quantitative analysis methods were used to compare with conventional CT mixed energy images. Results Quantitative analysis: The higher the keV,the higher the SNR and CNR in the frontal temporal cortex 、 white matter and the fourth ventricle, and the lower the SNR and CNR in the gray white matter region of the occipital lobe. All artifact index AI were consistently reduced. Under the same keV level parameter setting, AI in the NO-MAR group were lower than the O-MAR group and the threshold plateau period of data appeared at 80 keV(P< 0.01);Under the energy level setting of the same keV,The value of O-MAR for frontal temporal and cerebellar hemisphere and bridged SNR was higher than NO-MAR(P<0.01).When 40~140 keV,the SNR value of O-MAR in the fourth ventricle was higher than that of NO-MAR. However, there was no significant difference at 100~140 keV(P> 0.05).SNR in occipital cortex at 120 keV and 140 kev O-MRA was above that of NO-MRA(P<0.05) and there was no statistical difference in the 40~100 keV(P> 0.05);CNR O-MAR in frontotemporal and cerebellar hemisphere and pons were higher than those of NO-MAR in the same keV level parameter setting(P<0.01), but there was no significant difference in the fourth ventricle and occipital cortex.ital cortex(P> 0.05).There was no statistical difference in weight, height or BMI scores(t=9.068,P> 0.05).Qualitative analysis: good subjective assessment of image quality between two readers(k=0.97,P> 0.05),O-MAR image s

关 键 词：颅骨 计算机断层扫描 多能谱成像 单能谱成像 线束硬化伪影 

分 类 号：R816.1[医药卫生—放射医学]