CAJ | 학술논문

目的探讨能谱CT单能量技术对腹部恶性肿瘤细小供血动脉CTA图像质量优化的价值.方法回顾性分析行能谱CT检查的32例腹部恶性肿瘤患者资料,采用能谱CT扫描技术行腹部平扫及3期动态增强扫描,分别采用140 kVp混合能量、66 keV单能量和最佳单能量3组模式重建显示肿瘤微小供血动脉.数据采集完成后直接获得140 kVp和70 keV单能量图像,再通过AW4.5工作站GSI Viewer软件得到66 keV和最佳单能量图,比较140 kVp混合能量、66 keV单能量和最佳单能量3组肿瘤供血动脉的对比噪声比(CNR)、信噪比(SNR)及其图像质量评分,并采用单因素方差分析进行比较.结果最佳单能量组、66 keV单能量组、140 kVp混合能量组肿瘤细小供血动脉的CNR分别是21.70±9.74、16.63±7.60和9.85 ±6.76,SNR分别为35.05±17.75、26.77±11.51和16.32±9.50,图像质量评分分别为4.58±0.40、3.55±0.57和2.75±0.46,差异均有统计学意义(F值分别为17.11、15.73和116.01,P值均＜0.01),两两比较差异也均有统计学意义(P值均＜0.05),最佳单能量组CNR、SNR和主观评分优于66 keV单能量组和140 kVp混合能量组.结论能谱CT最佳单能量技术能够优化腹部恶性肿瘤细小供血动脉的CTA质量.
목적 탐토능보CT단능량기술대복부악성종류세소공혈동맥CTA도상질량우화적개치.방법 회고성분석행능보CT검사적32례복부악성종류환자자료,채용능보CT소묘기술행복부평소급3기동태증강소묘,분별채용140 kVp혼합능량、66 keV단능량화최가단능량3조모식중건현시종류미소공혈동맥.수거채집완성후직접획득140 kVp화70 keV단능량도상,재통과AW4.5공작참GSI Viewer연건득도66 keV화최가단능량도,비교140 kVp혼합능량、66 keV단능량화최가단능량3조종류공혈동맥적대비조성비(CNR)、신조비(SNR)급기도상질량평분,병채용단인소방차분석진행비교.결과 최가단능량조、66 keV단능량조、140 kVp혼합능량조종류세소공혈동맥적CNR분별시21.70±9.74、16.63±7.60화9.85 ±6.76,SNR분별위35.05±17.75、26.77±11.51화16.32±9.50,도상질량평분분별위4.58±0.40、3.55±0.57화2.75±0.46,차이균유통계학의의(F치분별위17.11、15.73화116.01,P치균＜0.01),량량비교차이야균유통계학의의(P치균＜0.05),최가단능량조CNR、SNR화주관평분우우66 keV단능량조화140 kVp혼합능량조.결론 능보CT최가단능량기술능구우화복부악성종류세소공혈동맥적CTA질량.
Objective To investigate the optimal monochromatic parameters of CT angiography (CTA) on small feeding arteries of abdominal tumors using single source dual-energy CT with gemstone spectral imaging (GSI) technique.Methods The clinical and medical imaging data of 32 patients with abdominal malignant tumor were analyzed retrospectively during January to April 2012.Three phase-enhanced CT scans (Discovery CT750 HD,GE Heahhcare,Milwaukee,USA) of the abdomen were recorded using the GSI technique on 32 patients.The minor feeding arteries of tumor with diameter between 1.5 mm to 3.0 mm were reconstructed by 140 kVp mixed energy,66 keV,and optimal monochromatic mode respectively.After CT scanning,the original data were processed with layer and interval of 0.625 mm,the 140 kVp mixed energy images and 70 keV monochromatic images were obtained with standard algorithm.The original images were conveyed to AW4.5 work-station to process furthermore,then the data of the optimal monochromatic group and 66 keV group were reconstructed.Comparative parameters include contrast-to-noise ratio (CNR),signal-to-noise ratio (SNR) and subjective scores of the small feeding arteries CTA quality.Subjective scores were evaluated by two radiologists according to the sharpness and resolution of the small feeding arteries.One-way ANOVA was used to for statistical analysis.Results CNR of the optimal monochromatic group,the 66 keY group,and the 140 kVp mixed energy group were 21.70 ±9.74,16.63 ±7.60,and 9.85± 6.76,respectively.SNR were 35.05 ± 17.75,26.77 ± 11.51,and 16.32 ± 9.5,respectively.Subjective scores were 4.58 ± 0.40,3.55 ± 0.57,and 2.75 ± 0.46,respectively.CNR,SNR and subjective scores had significant difference among groups (F =17.11,15.73 and 116.01,P ＜ 0.01).The optimal monochromatic group was superior to the 66 keV group and the 140 kVp mixed energy group.Conclusion The optimal monochromatic mode can improve CTA quality of small feeding arteries of abdomen malignant tumors with GSI technique using single source dual-energy CT.