The evaluation of the individual scanning technique of CARE Dose 4D control mode to coronary artery in 128-detector MSCT

LI Jing; SHANG Hui-lan; XU Ji-ming; ZHOU Ping; TENG Mei-zhu; YANG Yang; SHEN Shan-zhong

Abstract：Objective To evaluate the individual scanning technique of CARE Dose 4D control mode to coronary artery in 128‐detector MSCT .Methods The coronary artery examining patients were divded into the common group(Group A) and the low‐dose group (Group B) randomly ,with 100 cases per group .BMI ranged from 18 .5~24 .9 kg/m2 and aged from 45 to 80 with 46 male cases and 54 female cases in each group .The image quailty ,the noise ,the signal to noise ratio (SNR) ,the volume CT dose index (CTDIvol) and the effective dose (ED) were evaluated between Group A and B .The difference of the two groups coronary artery scanning were compared by t test ,P <0 .05 and there was significant differ‐ence between the two groups .The scanning image quality were blind trial by 2 senior radiologists .Results Group A〔BMI (23 .45 ± 1.86) kg/m2 ) and B〔BMI(23 .27 ± 1 .93) kg/m2 ) .The image noise in the two groups were(28 .25 ± 5 .86) HU , (30 .19 ± 6 .63)HU and the SNR 13 .34 ± 3 .54 ,15 .16 ± 4 .82 ,the score of the image quality (3 .65 ± 0 .48) and (3 .57 ± 0.49) respectively .There was no significant difference in these options between the two groups ( P>0 .05) .The CTDIv‐ol in Group A and B were (25 .53 ± 4 .17) mGy and (13 .79 ± 3 .48) mGy respectively .The ED were (6 .98 ± 1 .14) mSv and (3 .81 ± 0 .94) mSv respectively .The CTDIvol and ED in Group B were significantly lower than those in Group A . There was significant difference between the two groups ( P<0 ,05) .Conclusion The CareDose4D can achieve the image quality and reduce the CCTA scanning radiation dose and balance the individual dose based on different BMI at the same time when using 128‐detector MSCT .