优化CT扫描方式和参数在颅底骨折诊断中的应用
Optimization of CT scanning patterns and parameters in diagnosis of basicranial fracture
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摘要: 目的: 通过对颅底骨折患者CT扫描方式和技术参数的优化,以提高CT图像质量,降低颅底骨折漏诊率。方法: 采用水模型分别对X线量(50 mAs、100 mAs、180 mAs、225 mAs)以及螺旋和非螺旋两种扫描方式,进行噪声测试比较。41例颅脑外伤患者,在常规CT条件下和经优化技术参数条件下分别作了平扫,并将两种技术参数检查结果进行了分析对比。结果: 以高X线量(225 mAs)和非螺旋扫描条件下,所得图像的噪声最小;在经优化技术参数扫描和常规CT扫描获得的两种颅底图像中,发现层厚越薄(3 mm以下),骨骼伪影越少;高分辨重组算法H80s和适当的窗宽W2000、窗位L600,可提高颅底图像对细微骨结构的分辨能力。结论: 采用优化的技术参数对颅底骨折患者进行CT扫描,图像清晰,能够增加骨折的发现率。Abstract: Objective: To improve CT imaging qualities and reduce rate of missed diagnosis in basicranial fracture by optimizing patterns of CT scanning and technical parameter.Methods: The water model was used and the imaging noise was acquired and compared with different X-ray amount(50 mAs,100 mAs,180 mAs and 225 mAs),spiral and non-spiral CT scanning patterns.Conventional and optimized technical parameter plain CT scanning were performed in 41 patients with craniocerebral trauma.The acquired images were analyzed.Results: Minimal noise was acquired with high X-ray amount(225 mAs) and non-spiral CT scanning.Compared images of optimized technical parameters with conventional CT scanning,it could be found that the thinner of the slice thickness(thinner than 3 mm),the less of the skeletal artificial effects.Imaging resolving power of fine basal skeletal structure could be improved with high resolution reconstruction(H80s) and optimal window width(W2000) and window level(L600).Conclusions: The acquired images are clear with optimized technical parameters CT scanning in patients with basicranial fracture.It might increase the finding rate of basicranial fracture.
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