四种CT扫描模式对肺动脉成像图像质量和辐射剂量的影响

发布时间：2018-06-20 17:26

  本文选题：肺栓塞 + 体层摄影术　； 参考：《中国医学影像学杂志》2015年01期

【摘要】：目的比较肺动脉CT血管造影(CTPA)成像中,双源CT的大螺距Flash模式、双能模式(DECT)、传统128层螺旋CT模式(128-CT)及64层CT(64-CT)扫描模式下,图像成像质量及辐射剂量的差异。资料与方法临床拟诊为肺动脉栓塞的167例患者中,先从Flash模式的患者中随机选出20例,计算体重指数和平均年龄,以此为标准,选出体重指数和年龄匹配的其他3组不同检查模式患者,每组20例。由2名医师对图像质量进行5级评分及信噪比(SNR)比较,并比较各组CT容积剂量指数(CTDIvol)、剂量长度乘积(DLP)及有效剂量(ED)。结果 Flash组CTDIvol、DLP和ED分别为(3.72±0.74)m Gy、(137.5±28.7)m Gy·cm、(2.34±0.41)m Sv,DECT组分别为(5.31±1.21)m Gy、(181.6±34.5)m Gy·cm、(3.24±0.57)m Sv,128-CT组分别为(5.66±1.47)m Gy、(198.7±42.1)m Gy·cm、(3.58±0.63)m Sv,64-CT组分别为(6.75±1.68)m Gy、(231.5±54.2)m Gy·cm、(4.21±0.89)m Sv。4种方法对肺动脉不同部位图像质量主观评分和SNR比较,差异无统计学意义(P0.05)。结论 4种扫描方式得到的图像质量无明显差异,双源CT的大螺距Flash模式辐射剂量最小,DECT和128-CT模式辐射剂量无明显差别,64-CT模式辐射剂量最大。
[Abstract]:Objective to compare the imaging quality and radiation dose of dual-source CT with large pitch Flash mode, dual-energy CT mode (DECT), conventional 128-CT mode (128-CT) and 64-slice CT (64-CT) mode in pulmonary artery CT angiography (CTPA) imaging. Materials and methods Twenty out of 167 patients with pulmonary embolism who were clinically diagnosed as pulmonary embolism were randomly selected from the Flash mode to calculate body mass index (BMI) and mean age. The other three groups of patients with body mass index and age matching were selected, 20 patients in each group. The image quality and SNR were compared by two physicians, and the CT volume dose index (CTDIvoll), dose length product (DLP) and effective dose (EDV) were compared in each group. 缁撴灉 Flash缁凜TDIvol,DLP鍜孍D鍒嗗埆涓，

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