| 谢新红,林土兴.MSCT颅底低剂量扫描的层厚选择[J].中国医学影像技术,2009,25(S1):184~186 |
| MSCT颅底低剂量扫描的层厚选择 |
| Slice thickness selection of low-dose multi-slice CT scanning in submento-vertex |
| 投稿时间：2008-03-07 修订日期：2009-05-12 |
| DOI： |
| 中文关键词: 多层螺旋CT 低剂量 颅底扫描 扫描层厚 |
| 英文关键词:Multi-slice helical CT Low-dose Submento-vertex scan Slice thickness of scanning |
| 基金项目: |
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| 中文摘要: |
| 目的 在保证图像质量及诊断要求前提下,探讨低剂量颅底扫描搭配最佳层厚技术的可行性。方法 以常规扫描剂量150 mAs为参照,以患者头颅周径为依据,分析比较其对病变的定性诊断情况及单次扫描加权的CT剂量指数(CTDIvol)值等。对20名健康人和20例颅底区域肿瘤和骨折出血患者行颅底低剂量(50 mAs、40 mAs) 螺旋CT扫描, 以评价5.0 mm、3.75 mm 和2.5 mm三种扫描层厚对颅底病变显示率的影响。结果 颅底周径大于50 cm的患者均采用120 kV、50 mAs、5.0 mm层厚螺旋扫描,图像合格率达到100％。结论 在容积CT剂量指数(CTDIvol)值、扫描剂量长度乘积(DLP)、反映噪声大小的图像相邻两点的密度差SD值等较客观数据的评价下,采用120 kV、50 mAs、5.0 mm层厚颅脑扫描是可行的。 |
| 英文摘要: |
| Objective To discuss the feasibility of the optional low-dose scanning collination for submento-vertex under the precondition of ensuring image quality and diagnosis request. Methods Under the precondition that ensure image quality and diagnosis request, referring to the conventional scanning dose 150 mAs, according as the head perimeter of sufferers, qualitative diagnosis for pathological changes and CTDIvol of single scan were analyzed. Forty experiment-objects (the half were healthy, the other half were suffered from submento-vertex area tumour or racture-bleeding) were underwent low-dose Helical CT for submento-vertex in order to evaluate the influence for display-rate of submento-vertex pathological changes at different collinations of 5.0 mm, 3.75 mm, 2.5 mm. Results The sufferers whose submento-vertex perimeter were longer than 50 cm were underwent Helical CT at 120 kV, 50 mAs and the collination of 5 mm, the eligible rate of their images were up to 100%. Conclusion Skull scan at 120 kV, 50 mAs, the collination of 5 mm is feasible in the appraisement of CTDIvol, DLP, density differenced of two points on the image which reflect yawp (SD) and other impersonal data. |
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