智力低下(mental retardation, MR)是小儿神经精神疾病的常见症状之一,部分可有脑组织的形态、病理改变,计算机断层摄影(computed tomography, CT)常被用来排除患儿颅内的形态异常。目前国内外有关正常儿童颅内含脑脊液腔的CT测量资料甚少,致使CT诊断MR缺少正常参照值。本研究对100例1-12岁我国正常儿童的CT图象进行了观察测量,为CT诊断MR提供形态依据并探讨正常值范围。 Mental retardation (MR) is one of the common symptoms of neuropsychiatric disorders in children. Some of them may have morphological and pathological changes of brain tissue. Computed tomography (CT) is often used to exclude intracranial morphology in children abnormal. At present, there is little data about CT measurement of intracranial cerebrospinal fluid in children at home and abroad, which makes CT diagnosis of MR lack of normal reference value. In this study, 100 cases of 1-12-year-old children in our country CT images were observed and measured for the diagnosis of MR to provide morphological basis for CT and explore the normal range.