CAJ | 학술논문

目的探讨多层螺旋CT肺动脉成像(MSCTPA)中应用低管电压(kVp)结合个体化管电流设置减低辐射剂量的可行性.方法连续56例拟行MSCTPA的患者纳入研究,用SPSS产生的随机数随机分为2组:A组27例,采用120 kVp和100 mAs;B组29例,采用100 kVp并根据患者体重个体化调节管电流输出(约1.0 mAs/kg),B组分别采用标准算法(FC13,B1组)和降噪算法(FC11,B2组)重建图像.比较辐射剂量及图像质量.结果 B组的容积CT剂量指数(CTDIvol)、剂量长度乘积(DLP)、有效吸收剂量(E)均数分别为5.1 mGy、83.3 mGy·cm和1.4 mSv,与A组比较,分别下降了64.3％、66.4％和66.7％ (F =32.57,12.32,11.98,P＜0.05).与A组比较,B1组图像噪声增加了118.2％(t=10.05,P＜0.05),中央肺动脉和周围肺动脉的信噪比(SNR)与对比噪声比(CNR)及主观评分均值分别降低了51.5％、46.6％、50.8％、45.3％和20.4％(t=7.20、6.30、6.58、5.54、8.35,P＜0.05).与B1组比较,B2组图像噪声又减低了32.5％(t=6.12,P＜0.05),中央肺动脉和周围肺动脉的SNR与CNR及主观评分均值分别增加46.2％、46.2％、45.9％、46.9％和18.4％(t=3.19、3.55、2.95、3.37、5.42,P＜0.05).与A组比较,B2组图像噪声增加47.3％(t=4.03,P＜0.05),中央肺动脉和周围肺动脉的SNR与CNR及主观评分均值分别降低29.1％、21.8％、28.2％、19.6％和8.2％(=4.06、2.82、3.68、2.22、3.02,P＜0.05).结论在保证良好图像质量情况下,MSCTPA中应用低kVp(100 kV)结合个体化管电流输出设置(约1.0 mAs/kg)可以显著降低辐射剂量.
목적 탐토다층라선CT폐동맥성상(MSCTPA)중응용저관전압(kVp)결합개체화관전류설치감저복사제량적가행성.방법 련속56례의행MSCTPA적환자납입연구,용SPSS산생적수궤수수궤분위2조:A조27례,채용120 kVp화100 mAs;B조29례,채용100 kVp병근거환자체중개체화조절관전류수출(약1.0 mAs/kg),B조분별채용표준산법(FC13,B1조)화강조산법(FC11,B2조)중건도상.비교복사제량급도상질량.결과 B조적용적CT제량지수(CTDIvol)、제량장도승적(DLP)、유효흡수제량(E)균수분별위5.1 mGy、83.3 mGy·cm화1.4 mSv,여A조비교,분별하강료64.3％、66.4％화66.7％ (F =32.57,12.32,11.98,P＜0.05).여A조비교,B1조도상조성증가료118.2％(t=10.05,P＜0.05),중앙폐동맥화주위폐동맥적신조비(SNR)여대비조성비(CNR)급주관평분균치분별강저료51.5％、46.6％、50.8％、45.3％화20.4％(t=7.20、6.30、6.58、5.54、8.35,P＜0.05).여B1조비교,B2조도상조성우감저료32.5％(t=6.12,P＜0.05),중앙폐동맥화주위폐동맥적SNR여CNR급주관평분균치분별증가46.2％、46.2％、45.9％、46.9％화18.4％(t=3.19、3.55、2.95、3.37、5.42,P＜0.05).여A조비교,B2조도상조성증가47.3％(t=4.03,P＜0.05),중앙폐동맥화주위폐동맥적SNR여CNR급주관평분균치분별강저29.1％、21.8％、28.2％、19.6％화8.2％(=4.06、2.82、3.68、2.22、3.02,P＜0.05).결론 재보증량호도상질량정황하,MSCTPA중응용저kVp(100 kV)결합개체화관전류수출설치(약1.0 mAs/kg)가이현저강저복사제량.
Objective To assess the feasibility of low-dose MDCT pulmonary angiography (MDCTPA) by using low kVp combined with individual-adapted low tube current protocol and noise reduction filter algorithms.Methods Fifty-six consecutively patients with MDCTPA were enrolled in the study.The patients were randomly divided into group A (120 kVp,100 mAs) and group B (100 kVp,individual-adapted tube current about 1.0 mAs/kg).Two series of images were reconstructed in group B:B1 with standard filter algorithms (FC13,B1) and B2 with noise reduction filter algorithms (FC11,B2).The image noise,quality and radiation dose in two groups were compared.Results The CTDIvol,DLP and E of group B were 5.1 mGy,83.3 mGy· cm and 1.4 mSv respectively,which were reduced by 64.3％,66.4％ and 66.7％,respectively (F =32.57,12.32,11.98,P ＜ 0.05) when compared with those in group A.Compared with group A,the image noise in B1 was increased by 118.2％ (t =10.05 P ＜0.05),the central and peripheral SNR and CNR and scores were increased by 51.5％,46.6％,50.8％,45.3％and 20.4％,respectively(t =7.20,6.30,6.58,5.54,8.35,P ＜ 0.05).Compared with B1,the image noise in B2 was reduced by 32.5％ (t =6.12,P ＜0.05),the central and peripheral SNR and CNR and scores were increased by 46.2％,46.2％,45.9％,46.9％ and 18.4％ (t =3.19,3.55,2.95,3.37,5.42,P ＜0.05).Compared with group A,the image noise in B2 group was increased by 47.3％ (t =4.03,P ＜0.05),the central and peripheral SNR and CNR and scores were reduced by 29.1％,21.8％,28.2％,19.6％ and 8.2％(t =4.06,2.82,3.68,2.22,3.02,P＜0.05).Conclusions Keeping effective diagnostic image quality,the protocol with low kVp and individual-adapted low tube current for low-dose MDCT pulmonary angiography would be effective and feasible,and the radiation dose would be significantly reduced.