CAJ | 학술논문

目的探讨应用自适应统计迭代重建(ASiR)和基于模型的迭代重建(MBIR)降低盆腔CT扫描剂量的可行性.方法应用宝石能谱CT以不同的管电流对标准男性模体扫描,记录不同毫安值扫描条件下的容积CT剂量指数(CTDIvol)和剂量长度乘积(DLP),测量滤过反投影重建(FBP)、50％ASiR及MBIR 3种重建模式下图像的平均CT值、噪声及对比噪声比.由3位高年资医师对图像给予主观评价.结果 50％ASiR及MBIR重建算法比FBP重建算法噪声明显减少,对比噪声比明显提高.能够符合诊断要求的最小mA值分别为250 mA(FBP)、180 mA(50％ASiR)和100 mA(MBIR).在同等图像质量情况下,50％ASiR及MBIR重建模式分别可减少剂量28.0％及59.9％.结论高级迭代重建算法能够减少图像噪声,提高图像对比噪声比,降低盆腔CT剂量.
목적 탐토응용자괄응통계질대중건(ASiR)화기우모형적질대중건(MBIR)강저분강CT소묘제량적가행성.방법 응용보석능보CT이불동적관전류대표준남성모체소묘,기록불동호안치소묘조건하적용적CT제량지수(CTDIvol)화제량장도승적(DLP),측량려과반투영중건(FBP)、50％ASiR급MBIR 3충중건모식하도상적평균CT치、조성급대비조성비.유3위고년자의사대도상급여주관평개.결과 50％ASiR급MBIR중건산법비FBP중건산법조성명현감소,대비조성비명현제고.능구부합진단요구적최소mA치분별위250 mA(FBP)、180 mA(50％ASiR)화100 mA(MBIR).재동등도상질량정황하,50％ASiR급MBIR중건모식분별가감소제량28.0％급59.9％.결론 고급질대중건산법능구감소도상조성,제고도상대비조성비,강저분강CT제량.
Objective To assess the dose reduction potential of adaptive statistical iterative reconstruction(ASiR)and model-based iterative reconstruction(MBIR)in pelvic CT with a standard male phantom.Methods A Fluke Biomedical RANDO standard male phantom was scanned with discovery CT750 HD using different tube currents.CT images were reconstructed with FBP,50％ASiR and MBIR.The CT value,the image noise and the contrast-to-noise ratio(CNR)for the sacral vertebra relative to muscle were measured.The volume CT dose indexes(CTDIvo1)and dose-length product(DLP)were recorded.Results Compared with FBP,using 50％ASiR and MBIR had significant reduced image noise and greater CNR.The effective minimal tube currents for displaying sacral vertebra were 250 mA(FBP),180 mA(50％ASiR),and 100 mA(MBIR).With the similar image quality using FBP,the dose was reduced by 28.0％ and 59.9％ using 50％ASiR and MBIR,respectively.Conclusions Using advanced iterative algorithms can reduce image noise,improve CNR,and reduce the radiation dose in pelvic CT examination.