CT angiography of the aorta using 80kVp in combination with sinogram-affirmed iterative reconstruction and automated tube current modulation: Effects on image quality and radiation dose

作     者：Boos, Johannes Aissa, Joel Lanzman, Rotem S. Heusch, Philipp Schimmoeller, Lars Schleich, Christoph Thomas, Christoph Antoch, Gerald Kroepil, Patric 

作者机构：Univ Dusseldorf Fac Med Dept Diagnost & Intervent Radiol D-40225 Dusseldorf Germany Harvard Univ Sch Med Beth Israel Deaconess Med Ctr Dept Radiol 330 Brookline Ave Boston MA 02215 USA 

出 版 物：《JOURNAL OF MEDICAL IMAGING AND RADIATION ONCOLOGY》 (澳大利西亚放射学)

年 卷 期：2016年第60卷第2期

页      面：187-193页

核心收录：

学科分类：0831[工学-生物医学工程（可授工学、理学、医学学位）] 100207[医学-影像医学与核医学] 1006[医学-中西医结合] 1002[医学-临床医学] 1001[医学-基础医学(可授医学、理学学位)] 08[工学] 1010[医学-医学技术（可授医学、理学学位）] 100106[医学-放射医学] 1009[医学-特种医学] 10[医学] 100602[医学-中西医结合临床] 

主　　题：aorta computed tomography diagnostic imaging radiation dose vascular 

摘      要：IntroductionThe objective of this study was to evaluate image quality and radiation dose of a CT angiography (CTA) protocol using 80kVp in combination with iterative reconstruction and automated tube current modulation. MethodsNinety-five aortic CTA examinations were included in this study. A novel 80kVp aortic CTA-protocol with iterative reconstruction was introduced in our department in March 2012 for patients with a body mass index (BMI) below 32kg/m(2). The first 72 consecutive examinations were retrospectively assigned to group A (56 patients, 42 men, 14 women, mean age 69.610.7years, BMI range 19.7-31.1kg/m(2)). For comparison, the last 23 consecutive examinations performed with the old protocol (100kVp) were assigned to group B (21 patients, 13 men, 8 women, mean age 67.411.1years, BMI range 19.7-31.9kg/m(2)). Thoracic and abdominal contrast-to-noise ratio (CNR), signal-to-noise ratio (SNR) and aortic attenuation were assessed. Subjective image quality was rated on a 5-point scale (1=non diagnostic;5=excellent). Furthermore, dose length product (DLP) and volumetric computed tomography dose index (CTDIvol) were analysed. ResultsAll examinations achieved diagnostic image quality. Attenuation of the aorta was significantly higher in group A compared with B (thoracic: 443.5 +/- 90.5 Hounsfield units (HU) vs. 296.0 +/- 61.0HU;abdominal: 426.3 +/- 94.2HU vs. 283.6 +/- 60.5HU;P0.05, respectively). CTDIvol and DLP were significantly lower in group A (1.9 +/- 0.5mGy;139.2 +/- 41.1mGy x cm) as compared with group B (4.2 +/- 1.4mGy;292.1 +/- 91.5mGy x cm;P0.001, respectively). ConclusionLow-dose CTA of the aorta using 80kVp with iterative reconstruction enables a significant dose reduction of up to 50% compared with a 100kVp protocol in patients with