CAJ | 학술논문

_目的：以常规颅脑 CTA 为对照，研究双能量 CT 单能谱成像用于颅内动脉瘤颈夹闭术后评估的最佳能量范围。方法：对36例患者40组双能量数据进行回顾性分析。采用双能量单能谱软件在60～100 keV 之间每隔10 keV 值进行单能量图像重组，平均加权120 kV 为常规 CTA 图像，共6组图像。分别测量每组图像伪影影响最重的脑组织和血管CT 值，评估线束硬化伪影和血管对比度，并对单能量和 CTA 图像质量进行主观评价。结果：60～100 keV 之间单能量图像的动脉瘤夹金属伪影分别为（116．9±73．0）、（72．4±37．3）、（49．8±27．0）、（34．8±20．7）和（26．7±18．2）HU。常规CTA 图像的硬化伪影（62．5±31．6）HU 与70～80 keV 单能量图像差异无统计学意义（P＞0．05），80～100 keV 的单能量图像硬化伪影低于常规 CTA。60～100 keV 单能量图像的血管对比度分别为（301．9±74．9）、（217．6±54．2）、（163．8±41．8）、（126．9±34．2）和（103．1±46．1）HU，常规 CTA 的血管对比度（183．5±48．8）HU 与70～80 keV 单能量图像差异无统计学意义（P＞0．05）。60～100 keV 和常规 CTA 图像质量为优和良的比例分别为20．0％、47．5％、85％、35％、15％、65％。结论：双能量 CT 成像用于颅内动脉瘤颈夹闭术后患者评估的最佳能量范围是70～80 keV，80 keV 有望成为最佳单能量成像点。
_목적：이상규로뇌 CTA 위대조，연구쌍능량 CT 단능보성상용우로내동맥류경협폐술후평고적최가능량범위。방법：대36례환자40조쌍능량수거진행회고성분석。채용쌍능량단능보연건재60～100 keV 지간매격10 keV 치진행단능량도상중조，평균가권120 kV 위상규 CTA 도상，공6조도상。분별측량매조도상위영영향최중적뇌조직화혈관CT 치，평고선속경화위영화혈관대비도，병대단능량화 CTA 도상질량진행주관평개。결과：60～100 keV 지간단능량도상적동맥류협금속위영분별위（116．9±73．0）、（72．4±37．3）、（49．8±27．0）、（34．8±20．7）화（26．7±18．2）HU。상규CTA 도상적경화위영（62．5±31．6）HU 여70～80 keV 단능량도상차이무통계학의의（P＞0．05），80～100 keV 적단능량도상경화위영저우상규 CTA。60～100 keV 단능량도상적혈관대비도분별위（301．9±74．9）、（217．6±54．2）、（163．8±41．8）、（126．9±34．2）화（103．1±46．1）HU，상규 CTA 적혈관대비도（183．5±48．8）HU 여70～80 keV 단능량도상차이무통계학의의（P＞0．05）。60～100 keV 화상규 CTA 도상질량위우화량적비례분별위20．0％、47．5％、85％、35％、15％、65％。결론：쌍능량 CT 성상용우로내동맥류경협폐술후환자평고적최가능량범위시70～80 keV，80 keV 유망성위최가단능량성상점。
Using conventional CTA as control,to explore the optimal energy range for mono-energetic ima-ging of the dual-energy CT to evaluate the postoperative patient with intracranial aneurysm clipping.Methods:40 sets of du-al energy CT data from 36 patients were analyzed retrospectively.The dual-energy CT data were processed by using the mono-energetic software.Then single energy images were generated every 10keV ranging from 60 to 100 keV.The average weighted 120kV was set as conventional CTA image for comparison.In order to assess the beam hardening artifacts and vascular contrast,the CT value of cerebral tissue and blood vessels were measured,ROI were set on regions where were most severe affected by hardening artifacts.Reconstructed single energy images were assessed by two experienced radiolo-gists blindly.Results:The CT value of metal hardening artifact of aneurysm clip were (116.9 ± 73.0 ),(72.4 ± 37.3 ), (49.8±27.0),(34.8±20.7)and (26.7±18.2)HU for each group ranging from 60 to 100keV respectively.There was sta-tistically significant difference between above CT value in each group and that in the conventional CTA image (62.5 ± 31.6).The vascular contrast were (301.9 ± 74.9 ),(217.6 ± 54.2 ),(163.8 ± 41.8 ),(126.9 ± 34.2 )and (103.1 ± 46.1)HU for each group ranging from 60 to 100keV respectively.There was no statistically significant difference of vascu-lar contrast between the conventional CTA image (183.5±48.8)HU and 80 keV monoenergetic image.The ratios of excel-lent or good image quality of the single energy image were 20.0%,47.5%,85%,35.0%,15% for each group respectively and 65% for conventional CTA group.Conclusion:The optimal energy range of the dual-energetic imaging for postoperative evaluation of intracranial aneurysm neck clipping is from 70 to 80keV.The 80keV is suggested as the best setting point for single energy image because it has lower hardening artifacts while maintaining similar vascular contrast.