Ogbole Godwin, Odo Joseph, Efidi Richard, Olatunji Richard, Ogunseyinde Ayotunde
Department of Radiology, University College Hospital; Department of Radiology, University of Ibadan, Ibadan, Nigeria.
Department of Radiology, University College Hospital, Ibadan, Nigeria.
Niger Postgrad Med J. 2017 Apr-Jun;24(2):97-102. doi: 10.4103/npmj.npmj_27_17.
Low-field (LF) magnetic resonance imaging (MRI) is a technology that is widely used in resource-limited settings for clinical imaging. The images produced, even though of low resolution with noise and artefacts, provide valuable information and guidance for patient assessment and treatment. This study shows a spectrum of MRI artefacts that affect image quality during routine clinical neuroradiology practice using LF MRI in a Nigerian hospital and suggests ways to avoid them.
We retrospectively reviewed brain and spine MRI studies performed on a 0.36T MagSense 360 (Mindray, China) open MRI at our hospital over a 2-year period to identify image artefacts. About 90% of MRI studies performed at our facility during the study period were neuroimaging. The pattern and distribution of artefacts that featured during imaging were described and illustrative cases demonstrated highlighting their causes and ways to avoid or limit them.
Of 936 brain and spine cases evaluated, 506 (54.1%) had artefacts with 369 (72.9%) seen in the brain. Truncation/Gibbs (37.6%) and motion (20.6%) were the most common artefacts in the series, seen most commonly in T2-weighted images. There was no significant difference in the proportion of artefacts between adults and children (P = 0.736).
Artefacts are relatively common in neuroimaging with LF MRI and may potentially degrade image quality and interfere with accurate radiological reporting and diagnosis. Improving the recognition of LF MRI artefacts may assist imaging practitioners to avoid or limit their effect on image quality and interpretation.
低场（LF）磁共振成像（MRI）是一种在资源有限的环境中广泛用于临床成像的技术。所产生的图像尽管分辨率低且有噪声和伪影，但能为患者评估和治疗提供有价值的信息和指导。本研究展示了在尼日利亚一家医院使用低场MRI进行常规临床神经放射学实践期间影响图像质量的一系列MRI伪影，并提出了避免这些伪影的方法。
我们回顾性分析了在我院一台0.36T迈瑞MagSense 360开放式MRI上进行的为期2年的脑和脊柱MRI研究，以识别图像伪影。在研究期间，我院进行的MRI研究中约90%为神经成像。描述了成像过程中出现的伪影的模式和分布，并展示了说明性病例，突出其成因以及避免或限制伪影的方法。
在评估的936例脑和脊柱病例中，506例（54.1%）有伪影，其中369例（72.9%）出现在脑部。截断/吉布斯伪影（37.6%）和运动伪影（20.6%）是该系列中最常见的伪影，最常见于T2加权图像。成人和儿童之间伪影比例无显著差异（P = 0.736）。
在低场MRI神经成像中伪影相对常见，可能会降低图像质量并干扰准确的放射学报告和诊断。提高对低场MRI伪影的认识可能有助于成像从业者避免或限制其对图像质量和解读的影响。
