利用表面遮盖法进行头部CTA去骨成像  

Boneless head CTA by surface shaded display technique

作　　者：汤化民[1] 林伟[1] 唐昌会[1] 何源[1] 汪俐杉[1] 唐康宁[1] 

机构地区：[1]成都市第一人民医院放射科,四川成都610041

出　　处：《中国医学影像技术》2011年第3期615-617,共3页Chinese Journal of Medical Imaging Technology

摘　　要：目的初步探讨利用SSD进行头部CTA去骨的可行性,并与容积CT数字减影血管造影(VCTDSA)技术进行比较。方法制作颅骨血管模型,采用64排螺旋CT及两组不同的参数对标本各进行10次扫描。方法 A:平扫与增强扫描的参数一致,120 kV,200 mA,转速0.75秒/圈,层厚0.67 mm,Pitch 0.531。方法 B:平扫80 kV,100 mA,Pitch0.924;增强为120 kV,200 mA,Pitch 0.924,余参数与A方法一致。利用SSD对A、B两种方法进行头部CTA去骨成像,观察模拟血管的显示效果。同时测定两种扫描方式的平均辐射剂量[剂量长度乘积(DLP)]及SSD重建后颅骨模型的平均CT值,并进行统计学分析。结果通过SSD重建两组方法均遮盖去骨成功。采用A方法的DLP为(1215.25±41.35)mGy.cm,B方法为(701.90±19.24)mGy.cm,差异有统计学意义(P<0.01)。采用A方法的平均CT值为(642.96±12.02)HU,B方法为(642.23±13.23)HU,差异无统计学意义(P>0.05)。结论通过SSD重建进行的头部CTA去骨具有可行性。Objective To investigate the feasibility of boneless head CTA using SSD,and to compare with that using volume computed tomographic digital subtraction angiography（VCTDSA）.Methods The vascular-skull model was scanned 10 times with the Philips 64-slice spiral CT using method A and B,respectively.Method A： Tube voltage was 120 kV,tube current was 200 mA,speed was 0.75 s/r,and the thickness was 0.67 mm,pitch was 0.531.Same parameters were applied in both plain scan and enhanced scan.Method B： the parameters applied in plain scan： Tube voltage was 80 kV,tube current was 100 mA,pitch was 0.924;in enhanced scan,tube voltage was 120 kV,tube current was 200 mA,pitch was 0.924,other parameters were consistent with method A.Skull was removed using the technology of SSD and the effects of simulated blood vessels were evaluated.The average dose-length product（DLP） and the average CT values about SSD of the model with method A and B were also analyzed statistically.Results Skull was removed successfully using each method.The average DLP of method A was（1215.25±41.35）mGy·cm,while was（701.90±19.24）mGy·cm in method B（P0.01）.The average CT value was（642.96±12.02）HU of method A,（642.23±13.23）HU of method B（P0.05）.Conclusion Using SSD to remove skull in head CTA is feasible.

关 键 词：脑血管造影术 表面遮盖重建 体层摄影术 X线计算机 

分 类 号：R814.42[医药卫生—影像医学与核医学]