| 章伟敏,王志康,丁文洪.螺旋CT机的CT值均匀性检测方法的探讨[J].中华放射医学与防护杂志,2003,23(5):368-370 |
| 螺旋CT机的CT值均匀性检测方法的探讨 |
| Investigation of testing method on spiral CT uniformity |
| 投稿时间：2003-02-13 |
| DOI： |
| 中文关键词: 体层摄影术 X射线计算机 质量保证 标准 均匀性 |
| 英文关键词:Tomography X-ray computed Quality assurance Standards Uniformity |
| 基金项目: |
|
| 摘要点击次数: 2925 |
| 全文下载次数: 1892 |
| 中文摘要: |
| 目的 探讨影响CT值均匀性检测标准的因素,并提出改进意见。方法 通过改变模体条件和CT扫描条件,获得2台不同类型CT机的均匀性,观察影响均匀性检测标准的因素。结果 用头部条件扫描,模体未包铝环时,普通CT机的均匀性优于有软件校正功能的多层螺旋CT机;包铝环后,恰好相反用体部条件扫描时,2种类型的CT机相差不大。结论 在CT值均匀性检测时,若采用头部条件进行扫描时应考虑颅骨的影响,在对带有预校正功能的CT机进行检测时,应在模体四周绕1圈约2mm厚的铝环;若不加铝环直接进行CT值均匀性检测时应采用体部条件扫描。 |
| 英文摘要: |
| Objective To assess the factors influencing tesing standards of CT uniformity and put forward mending method. Methods The CT uniformity of two different types was obtained and the factors influencing testing standards of CT uniformity were observed with changing of conditions of phantom and CT scans. Results The uniformity in conventional CT was better than that in spiral CT with software emended function before packed with aluminum loop with the condition of head CT scan,and just the opposite result was obtained after packing.But there was no obviously difference in the uniformity between conventional and spiral CT with the condition of body scan. Conclusions The skull effect should be considered with the condition of head CT scan in the CT uniformity testing.Aluminum loop with 2 mm thickness around the phantom should be used on CT testing with pre-emended function.CT scan in uniformity testing with body condition should be used without aluminum loop.Otherwise,testing standards should be broadened. |
| HTML 查看全文 查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|