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- 2018
第三代双源CT不同扫描模式抑制下颈部伪影的对比
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Abstract:
摘要 目的： 通过对比下颈部CT常规扫描、双能量模式扫描、无预设值CARE kV联合CARE Dose 4D自动控制曝光技术,探索下颈部CT扫描抑制伪影的个性化方案.方法: 随机选取进行下颈部CT检查的患者99例,分成3组,A组:固定千伏、毫安扫描;B组:无预设值CARE kV联合CARE Dose 4D自动控制曝光技术扫描;C组:双能量模式扫描,分别将图像质量评分、噪声值、信噪比及容积CT剂量指数进行对比.结果: C组图像质量评分(3.70±0.51)高于B组(3.36±0.50), P<0.05,B组图像质量评分(3.36±0.50)明显高于A组(3.00±0.59),P<0.01;B组容积CT剂量指数(6.38±1.40)mGY明显低于A组(9.29 mGY), P<0.01;A组容积CT剂量指数(9.29 mGY)明显低于C组(12.58±4.74)mGY, P<0.01; C组噪声值(7.51±2.29)明显低于A组(12.03±3.52)、B组(12.18±4.47),两者P<0.01;C组信噪比(7.57±2.20)明显高于A组(5.19±1.86)、B组(5.51±1.86), 两者P<0.01; A、B组噪声值、信噪比无明显统计学意义(分别为P=0.86,P=0.52).结论: 建议常规下颈部CT扫描使用无预设值CARE kV联合CARE Dose 4D自动控制曝光技术,可获得辐射剂量最低、图像质量较优的影像,而双能量扫描模式能更大程度抑制下颈部伪影,在诊断下颈部疑难病变、定位细微病灶时,或在征得病人同意的情况下,可使用双能量模式获得更高质量的影像.
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