Feasibility study of 80 kVp low dose contrast media split-bolus 2-phase computed tomography urography
10.3969/j.issn.1002-1671.2017.10.030
- VernacularTitle:80kVp条件下低剂量对比剂分次团注双期CTU的应用研究
- Author:
Juan HU
1
;
He WANG
;
Jingyun WU
;
Huihui WANG
;
Ge GAO
;
Jian JIANG
;
Xiaoying WANG
Author Information
1. 北京大学第一医院医学影像科
- Keywords:
computed tomography;
urography;
iterative reconstruction;
contrast medium;
radiation dose
- From:
Journal of Practical Radiology
2017;33(10):1608-1611
- CountryChina
- Language:Chinese
-
Abstract:
Objective To evaluate the feasibility of 80 kVp tube voltage combined with adaptive statistical iterative reconstruction (ASiR)in low dose contrast media split-bolus 2-phase CTU.Methods Sixty patients with hematuria were recruited in this study.All the patients (80 kVp Group,n=30;120 kVp Group,n=30)underwent split-bolus 2-phase CTU (80 kVp Group:35 mL and 60 mL;120 kVp Group:50 mL and 70 mL).CTU images were reconstructed with 30％ ASiR in 80 kVp Group and with filtered back projection (FBP)in 120 kVp Group.Subjective and objective analysis of CTU images were accomplished by two qualified and independent readers.The radiation dose was evaluated by ED and SSDE.The image score,noise,attenuation value and CNR of urinary tract,and radiation dose were compared by Mann-Whitney rank sum test.Results There was no significant difference in the image quality between two groups (Z =-1.791,P =0.073).The noise of 80 kVp Group were higher than that of 120 kVp Group (Z =-6.299,P <0.001 ), while there was no significant difference of attenuation value between the two groups (Z =-1.204 --0.163,P =0.228 -0.871,except bladder),as well as the CNRs (Z =- 1.818 --0.202,P =0.069 -0.840).The ED and SSDE of 80kVp Group were significantly lower than those of 120 kVp Group (Z =-6.655--6.653,P <0.001).Conclusion The protocol of 80 kVp tube voltage combined with iterative reconstruction in low dose contrast media split-bolus 2-phase CTU is feasible for clinical application,with reduction of radiation dose and acceptable diagnostic image quality.
