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The study of the effect on the image quality in low-dose CT of the paranasal sinuses
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- Author:
- No author available
- Journal Title:
- CHINESE JOURNAL OF RADIOLOGY
- Issue:
- 3
- DOI:
- 10.3760/j.issn:1005-1201.2005.03.004
- Key Word:
- 鼻窦疾病;剂量效应关系,辐射;体层摄影术,X线计算机
Abstract： 目的探讨鼻窦CT扫描时单纯降低mA值,晶体接受的射线剂量及其对图像质量的影响.方法将50例行鼻窦冠状面CT扫描者根据有无炎症分为正常组(32例)与炎症组(18例).每组患者根据扫描的mA值设置分为200 mA和50 mA组.正常组有8例,炎症组有7例同时行高分辨重建.用镁铜磷氟化锂[LiF(Mg·Cu·P)] 热释光探测器测量晶体受到的照射剂量.评价不同条件、不同算法(软组织算法和高分辨算法)时的图像质量.评价指标为:中鼻甲、钩突、上颌窦开口、筛漏斗、额隐窝、筛板.评价标准为:未显示,0分;显示、但不清楚,1分;清楚显示,2分.左右单独计分.结果当mA值由200减至50时,晶体所接受的射线剂量由7.339 mGy降至1.108 mGy.两组差异有统计学意义(P<0.01).而图像质量无明显下降(P>0.05).对于正常组,高分辨重建有助于细小解剖结构的显示,对于炎症组高分辨重建并不能增加细节的显示程度.结论在单纯降低mA值的条件下,受检者所接受的射线剂量明显减少,虽然图像噪声有所增加,但图像仍然保持较好的诊断质量.
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