新虚拟单能量图像对早期胃癌的诊断价值

目的：探讨新虚拟单能量图像在早期胃癌中的应用价值。方法：回顾性分析29例在双源CT行腹部双期双能量增强扫描的早期胃癌病人,并经手术证实病理资料。采用双源CT后处理工作站（Dual energy Mono＋,syngo IPIPE,Siemens）使用100和Sn 140kV图像产生40keV、60keV、80keV三组新虚拟单能量图像（AMEIs）,并与常规120kVp图像（PEIs）对照,比较各组对早期胃癌的检出率及CNR差异。结果：AMEIs 40keV组具有最高检出率（86.21%）,但与PEIs组无统计学差异（P=0.062）。AMEIs 40keV组动脉期CNR及门静脉期CNR均明显高于其他各组（P均〈0.05）。结论：双源CT新40keV单能量图像可提高早期胃癌CNR,有利于EGC的检出。

Value of Advanced Virtual Monoenergetic Images in Evaluating Early Gastric Cancer

Objective： To evaluate the impact of advanced monoenergetic dual-energy computed tomography（DECT） datasets on detection rate and CNR of early gastric cancer（EGC）. Method： Total of 29 cases of EGC who underwent two phases DECT scan were retrospectively enrolled in this study. CT findings were compared with surgical and histopathologic results. Advanced monoenergetic images（AMEIs） at 40 keV, 60 keV and 80 keV were calculated from the 100 and Sn 140 kV DE image data respectively using a monoenergetic software application（Dual energy Mono＋, syngo IPIPE,Siemens）. Differences in detection rates of EGC and CNR numbers were compared between different AMEIs and conventionally reconstructed polyenergetic images（PEIs） at 120 kVp. Results： AMEIs at 40 keV showed the highest detection rate（86.21%） for EGC which showed no significant difference with PEIs（P = 0.062）. AMEIs at 40 keV revealed statistical higher CNR-AP and CNR-PP compared to other AMEIs and PEIs（all P〈 0.05）. Conclusion： Virtual 40 keV image datasets of advanced image-based calculated monoenergetic significantly increase the CNR of early gastric cancer which was helpful to detect EGCs.