Department of Radiology, Azienda Ospedaliero Universitaria (AOU), di Cagliari - Polo di Monserrato s.s. 554, 09045 Monserrato (Cagliari), Italy.
Department of Radiology, University La Sapienza, Rome, Italy.
J Neuroradiol. 2018 Mar;45(2):136-141. doi: 10.1016/j.neurad.2017.09.007. Epub 2017 Oct 5.
The purpose of this work was to compare the image quality and radiation dose delivered to patients during computed tomography (CT) angiography (CTA) of the supra-aortic arteries using two single-source (SS) and two dual-energy (DE) CT scanners.
In this retrospective study, 120 patients who underwent CTA of supra-aortic arteries were studied using four different types of CT scanners: a sixteen and forty-detector-row SS and two DE CT scanners. Seventy milliters of contrast medium were injected at a flow rate of 4mL/s using a power injector. For each patient the dose-length product (DLP), the volume computed tomography dose index (CDTIvol), the length of the scan and the effective dose (ED) were calculated. Qualitative and quantitative [image noise, signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR)] image quality assessment was performed.
A statistically significant lower value of the DE compared to the SS technology (P<0.0001) for the CDTI, DLP and ED was found, whereas we did not find any statistically significant difference between the four scanners for the measurements of the image noise, SNR and CNR.
DS CT scanners allow performing CTAs with a reduced dose compared to SS CT scanner with comparable image quality.
本研究旨在比较两种单源（SS）和两种双能（DE）CT 扫描仪在进行主动脉上 CT 血管造影（CTA）时的图像质量和患者所接受的辐射剂量。
在这项回顾性研究中，我们对 120 例行主动脉上 CTA 的患者使用四种不同类型的 CT 扫描仪进行了研究：一台 16 排和一台 40 排 SS 扫描仪和两台 DE CT 扫描仪。使用高压注射器以 4mL/s 的流速注射 70ml 造影剂。对于每位患者，计算剂量长度乘积（DLP）、容积 CT 剂量指数（CDTIvol）、扫描长度和有效剂量（ED）。进行了定性和定量（图像噪声、信噪比（SNR）和对比噪声比（CNR））图像质量评估。
与 SS 技术相比，DE 技术的 CDTI、DLP 和 ED 值显著降低（P<0.0001），但我们没有发现四台扫描仪在图像噪声、SNR 和 CNR 的测量值方面存在任何统计学上的显著差异。
与 SS CT 扫描仪相比，DS CT 扫描仪可在保证图像质量相当的情况下降低 CTA 的辐射剂量。
