双层探测器光谱CT 50 keV低能级图像对挽救颅内CTA扫描失败的可行性探索  

Feasibility Exploration of Dual-Layer Spectral Detector CT in Rescuing Intracranial Angiography Failure Using 50 keV Images

作　　者：张勇[1] 张妍[1] 丁金立 张磊[1] 郑凤莲 顾卫彬[1] ZHANG Yong;ZHANG Yan;DING Jinli;ZHANG Lei;ZHENG Fenglian;GU Weibin(Department of Radiology,Beijing Tiantan Hospital,Capital Medical University,Beijing 100070,China)

机构地区：[1]首都医科大学附属北京天坛医院放射科,北京100070

出　　处：《中国医疗设备》2022年第6期93-96,共4页China Medical Devices

摘　　要：目的探索双层探测器光谱CT利用50 keV低能级图像对挽救颅内冠状动脉CT血管造影(CT Angiography,CTA)扫描失败的可行性。方法回顾性分析在我院光谱CT上行颅内CTA扫描失败的31例患者的临床和影像资料。比较50 keV图像与常规图像上血管的CT值及相对于胼胝体的对比噪声比(Contrast to Noise Ratio,CNR)、可诊断性评分、血管容积重建(Volume Rendering,VR)难易程度。统计分析采用Wilcoxon检验进行分析。结果50 keV图像上颅内血管CT值[如颈内动脉C7段为(388.39±131.08)HU、基底动脉为(376.34±114.57)HU]均高于常规图像[如颈内动脉C7段为(202.61±53.60)HU、基底动脉为(196.18±50.22)HU],差异具有统计学意义(P<0.05)。50 keV图像上颅内血管CNR(如颈内动脉C7段为43.15±23.07、基底动脉为24.22±14.17)均大于常规图像(如颈内动脉C7段为19.45±9.37、基底动脉为15.90±6.98),差异具有统计学意义(P<0.05)。50 keV低能级扫描可提高图像的诊断价值,且诊断评分≥2的例数比常规图像明显增加。50keV低能级图像更易进行血管多级分支的VR。结论利用双层探测器光谱CT 50keV低能级图像的优势可挽救部分颅内CTA扫描失败的情况。Objective To explore the feasibility of dual-layer spectral detector CT(SDCT)in rescuing intracranial CT angiography(CTA)failure by using 50 keV images.Methods The clinical and imaging data of 31 patients with failed intracranial CTA scanning by SDCT in our hospital were retrospectively analyzed.CT values of intracranial arteries,the contrast to noise ratio(CNR)relative to the corpus callosum,diagnosability score,and difficulty of volume rendering(VR)for the intracranial artery were compared between the low-energy virtual monoenergetic(50 keV)images and the conventional images.Wilcoxon test was used for statistical analysis.Results CT values of the intracranial arteries in 50 keV images[e.g.,the C7 segment of internal carotid artery was(388.39±131.08)HU,basilar artery was(376.34±114.57)HU were much higher than those in conventional images[e.g.,the C7 segment of internal carotid artery was(202.61±53.60)HU,basilar artery was(196.18±50.22)HU],and the difference was statistically significant(P<0.05).CNR of the intracranial arteries in 50 keV images(e.g.,the C7 segment of internal carotid artery was 43.15±23.07,basilar artery was 24.22±14.17)were much higher than those in conventional images(e.g.,the C7segment of internal carotid artery was 19.45±9.37,basilar artery was 15.90±6.98),and the difference was statistically significant(P<0.05).The diagnostic value was improved in 50 keV images,and the cases with diagnosability score≥2 were more in the 50 keV images than those in the conventional images.VR for the intracranial artery branches was significantly easier in 50 keV images than in conventional images.Conclusion Partially unsuccessful intracranial CTA scans can be rescued by taking advantage of low-energy virtual monoenergetic images at 50 keV in dual-layer SDCT.

关 键 词：计算机断层成像 光谱CT 颅内血管成像 双层探测器 低能级图像 

分 类 号：R814.42[医药卫生—影像医学与核医学]