英文摘要中语态和时态的用法

　　Objective:The purpose of this study was to determine whether an in hospital transportable CT scanner can provide diagnostic brain images and to compare the quality of these images with those from a convertional fixed? platform CT scanner.

　　Subjects and Methods:Twenty seven patients with known or suspected intracranial pathology underwent imaging on a transportable scanner and a fixed? platform scanner within 1hr of each other.Images from each CT examination were evaluated independently by two neuroradiologists who were unaware of patient history.Conspicuousness of intracranial pathology and normal anatomy were rated on a 5? point scale (1 point 'optimal;5 points'poor or not visualized).Statistical comparisons were made using nonparametric tests.

　　Results:Seven CT scans were interpreted as showing normal findings and 20 scans revealed intracranial pathology on both CT scanners.Image quality was higher on the fixed scanner(average rating'2.42 points'SE=0.12)than on the transportable scanner(average rating'3.10 points'SE=0.12(p=0.001).Depiction of the cerebellum'midbrain'and supratentorial gray? white matter was better on the fixed scanner(p<0.05=.However'we found no significant differences in detection of intracranial pathology between scanners.Both radiologists found images from both scanners to bediagnostic in all 27 patients.

　　Conclusion:Images of the brain on the transportable CT scanner were less clear than those on a fixed scanner.However'images from the transportable CT scanner were diagnostic in 27 consecutivepatients.The implications of this finding are important for the provision of CT services for critically ill patients who cannot be transported to the radiology department.

　　上面是AJR(美国放射学杂志)中一段完整的英文摘要，从中可以看出其特点：①用词简练、准确;②时态为过去时;③不用第一人称，多用被动语态;④方法和结果中强调统计方法及数据。对母语非英语的作者来说，撰写英文摘要的质量好坏直接与作者的英文水平有关，在这方面，只有多阅读英文文献，才能提高英文写作水平，从而写出高质量的英文摘要。

　　优秀的核心医学期刊推荐：《现代消化及介入诊疗》

　　期刊周期：双月刊

　　期刊级别：核心期刊

　　国内统一刊号：CN：44-1580/R

　　国际标准刊号：ISSN：1672-2159

　　主办单位：广东省医学学术交流中心

　　主管单位：广东省卫生厅

　　《现代消化及介入诊疗》系中国科技论文统计源期刊(中国科技核心期刊)，在学术上遵循“三主三结合”：①以临床应用为主，基础理论与临床实践相结合;②以普及新技术新业务为主，普及与提高相结合;③以现代医学为主，中医与西医相结合。专业上以胃肠病学为主，兼顾肝胆胰疾病。介入诊疗主要反应消化内镜、超声、放射介入的进展，特别注重介入治疗、专家读片、疑难病例讨论、专题笔谈为其特色。把杂志办成一个立足广东，面向全国，接轨国际的消化病及介入诊疗的现代综合性学术刊物。