PDF(Pubmed)
Abstract：
The use of mobile head CT scanners in the neurointensive care unit (NICU) saves time for patients and NICU staff and can reduce transport-related mishaps, but the reduced image quality of previous mobile scanners has prevented their widespread clinical use. This study compares the image quality of SOMATOM On.Site (Siemens Healthineers, Erlangen, Germany), a state-of-the-art mobile head CT scanner, and a conventional 64-slice stationary CT scanner. The study included 40 patients who underwent head scans with both mobile and stationary scanners. Gray and white matter signal and noise were measured at predefined locations on axial slices, and signal-to-noise ratios (SNRs) and contrast-to-noise ratios (CNRs) were calculated. Artifacts below the cranial calvaria and in the posterior fossa were also measured. In addition, image quality was subjectively assessed by two radiologists in terms of corticomedullary differentiation, subcalvarial space, skull artifacts, and image noise. Quantitative measurements showed significantly higher image quality of the stationary CT scanner in terms of noise, SNR and CNR of gray and white matter. Artifacts measured in the posterior fossa were higher with the mobile CT scanner, but subcalvarial artifacts were comparable. Subjective image quality was rated similarly by two radiologists for both scanners in all domains except image noise, which was better for stationary CT scans. The image quality of the SOMATOM On.Site for brain scans is inferior to that of the conventional stationary scanner, but appears to be adequate for daily use in a clinical setting based on subjective ratings.
摘要：
在神经重症监护病房(NICU)中使用移动式头部CT扫描仪为患者和NICU工作人员节省了时间，并可以减少与运输相关的事故，但是以前移动扫描仪的图像质量下降阻止了它们的广泛临床使用。这项研究比较了SOMATOMOn的图像质量。Site(SiemensHealthineers,Erlangen,德国),最先进的移动式头部CT扫描仪，和传统的64层固定式CT扫描仪。该研究包括40名接受移动和固定扫描仪头部扫描的患者。在轴向切片上的预定位置测量灰色和白质信号和噪声，并计算信噪比(SNR)和对比噪声比(CNR)。还测量了颅骨下和后颅窝的伪影。此外,图像质量由两名放射科医师根据皮质髓质分化进行主观评估，颅下空间，头骨文物,和图像噪声。定量测量显示，在噪声方面，固定式CT扫描仪的图像质量显着提高，灰质和白质的SNR和CNR。移动CT扫描仪在后颅窝测量的伪影较高，但颅下伪影相当。除图像噪声外，两位放射科医生对所有领域的两种扫描仪的主观图像质量进行了类似的评级。对于固定CT扫描更好。SOMATOMOn的图像质量。脑部扫描的位置不如传统的固定式扫描仪，但根据主观评分，似乎足以在临床中日常使用。
