低管电压联合原始数据的迭代重建技术在盆腔CT扫描中的应用  

Application of low kilovoltage in combination with sinogram affirmed iterative reconstruction of second-generation dual source CT in pelvic scan

作　　者：曾宪春 

机构地区：[1]贵州省人民医院影像科,贵州贵阳550002\[2]昆明医科大学第一附属医院影像科

出　　处：《实用放射学杂志》2015年第4期638-641,645,共5页Journal of Practical Radiology

基　　金：贵州省科技厅自然科学联合基金项目(黔科合LH字[2014]7013号).

摘　　要：目的探讨Flash双源CT低管电压(100kVp)扫描联合迭代重建(IR)技术在盆腔CT扫捕中的应用价值。方法疑盆腔内病变行CT检查患者88例，体质量指数19kg／m^2<BMI≤25kg／m^2按随机原则，常规管电压FBP组45例采用120 kVp扫描，FBP重建；低压SAFIRE组43例采用100kVp扫描，SAFIRE重建(强度3级)；其余条件不变。比较2组的辐射剂量及图像的平均CT值、图像噪声、信号噪声比(SNR)、对比噪声比(CNR)、图像质量主观评分和诊断效能等。结果2组方案扫描辐射剂量的比较差异有统计学意义(P％0．05)，低压SAFIRE组较常规管电压组ED降低了35．42％；与常规管电压FBP组相比，低压SAFIRE组罔像噪声降低17．85％，SNR提高15．54％，CNR提高13．47％，且均存在统计学差异(P％0．05)。2组图像的主观评分比较差异无统计学意义(P>0．05)。2组重建图像对病变的诊断效能与临床诊断比较通过Y。检验无统计学意义(P>0．05)。结论在盆腔L、T扫捕中运用Flash双源CT低管电压(100kVp)联合SAFIRE重建技术，能降低辐射剂量并保证图像质量及诊断效能。Objective To investigate the value of low kilovoltage ( 100 kVp) in combination with sinogram affirmed iterative reconstruction (SAFIRE) of flash dual source CT in pelvic scan in comparison with routine kilovoltage (120 kVp) and filtered back projection (FBP). Methods 88 patients with suspected pelvic lesions underwent CT scan, and the range of BMI was 19 kg/m^2< BM≤25 kg/m^2. 45 patients were scanned with 120 kVp and FBP reconstruction (group 1),and other 43 with 100 kVp and SAFIRE reconstruction (selected strength level 3) (group 2 ). The other scanning parameters in all cases were similar. Mean CT values,image noise,SNR,CNR,subjective scoring and diagnosis efficiency between two groups were compared. Results The difference in radiation dose (ED) between two groups was statistically significant (P<0.05) ,and the ED in group 2 was decreased by 35.42% in comparison with that in group J. Compared with group 1,the noise in group 2 was decreased by 17.85%,however,the SNR and CNR were increased by 15. 54% and 13.47% respectively, exhibiting statistically significant differences (P<0.05). No differences in quality score and lesion detection rate were found. Conclusion The pelvic images using low kilovoltage ( 100 kVp) and SAFIRE-3 of second-generation dual source CT can meet the diagnostic requirements with significantly reduced radiation dosage.

关 键 词：盆腔 迭代重建 辐射剂量 计算机体层成像 

分 类 号：R323.5[医药卫生—人体解剖和组织胚胎学] R814.42[医药卫生—基础医学]