Low Tube Voltage and Iterative Model Reconstruction in Follow-up CT Angiography After Thoracic Endovascular Aortic Repair: Ultra-low Radiation Exposure and Contrast Medium Dose

被引：16

作者：

Hou, Ping ^{[1
]}

Feng, Xiangnan ^{[2
]}

Liu, Jie ^{[1
]}

Wang, Xiaopeng ^{[1
]}

Jiang, Yaojun ^{[1
]}

Dong, Leigang ^{[1
]}

Gao, Jianbo ^{[1
]}

机构：

[1] Zhengzhou Univ, Affiliated Hosp 1, Dept Radiol, 1 East Jianshe Rd, Zhengzhou 450052, Henan, Peoples R China

[2] Southwest Jiaotong Univ, Sch Econ & Management, Chengdu, Sichuan, Peoples R China

来源：

ACADEMIC RADIOLOGY | 2018年 / 25卷 / 04期

关键词：

Low-tube-voltage; iterative model reconstruction; follow-up CT angiography; COMPUTED-TOMOGRAPHY; IMAGE QUALITY; ABDOMINAL CT; CARDIAC-CT; COMBINATION; REDUCTION; RISK; METAANALYSIS; SETTINGS; AGENT;

D O I：

10.1016/j.acra.2017.11.001

中图分类号：

R8 [特种医学]; R445 [影像诊断学];

学科分类号：

1002 ; 100207 ; 1009 ;

摘要：

Rationale and Objectives: This study aimed to investigate the feasibility of reducing radiation exposure and contrast medium (CM) dose in follow-up computed tomography angiography (CTA) after thoracic endovascular aortic repair (TEVAR) using low tube voltage and knowledge-based iterative model reconstruction (IMR). Materials and Methods: Thirty-six patients that required follow-up CTA after TEVAR were included in this intra-individual study. The conventional protocol with standard tube voltage of 120 kVp and CM volume of 70 mL was applied in the first follow-up CTA of all the patients (control group A). The ultra-low CM dose protocol with low tube voltage of 80 kVp and weight-adapted CM volume of 0.4 mL/kg was utilized in the second follow-up CTA (study group B). Set A.FBP (group A filtered back-projection) contained images for group A that were reconstructed through FBP method. Three sets (B.FBP, B.HIR, and B.IMR) for group B were reconstructed using three methods, FBP, hybrid iterative reconstruction (HIR), and IMR, respectively. Objective measurements including aortic attenuations, image noise, contrast-to-noise ratios (CNRs), and figure of merit of CNR (FOMCNR), and subjective rating scores of the four image sets were compared. Results: Compared to the images in set A.FBP, the images in set B.IMR had better quality in terms of equivalent attenuation values, equivalent subjective scores, lower noise, higher or equivalent CNRs, and higher FOMCNR. The quality of images in sets B.FBP and B.HIR was unacceptable. The radiation exposure and CM dose in group B were 1.94 mGy and 28 +/- 5 mL, respectively, representing reductions of 77.6% (P < .001) and 60% (P < .001) as compared to those in group A. Conclusions: In follow-up examinations after TEVAR, CTA with ultra-low radiation exposure and CM dose is feasible using low tube voltage and IMR for nonobese patients.

引用

页码：494 / 501

页数：8

共 40 条

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