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 large spiral distance Flash mode, double energy mode (DECT), traditional 128 layer spiral CT mode (128-CT) and 64 layer CT (64-CT) scanning mode for the pulmonary artery CT angiography (CTPA), and the difference between the image quality and the radiation dose in the traditional 128 layer spiral CT mode (128-CT) and the 64 layer CT (64-CT) scanning mode. 20 cases were selected and the body mass index and the average age were calculated. The body mass index (BMI) and the other 3 groups of different age matched models were selected, 20 cases in each group. The image quality was compared with the 5 grades and the signal to noise ratio (SNR) by 2 doctors, and the CT volume dose index (CTDIvol), the dose length product (DLP) and the number of dose (DLP) were compared. Results CTDIvol, DLP and ED were (3.72 + 0.74) m Gy, (137.5 + 28.7) m Gy cm, (2.34 + 0.41) m Sv, respectively (5.31 + 1.21), respectively (181.6 + 34.5), respectively (3.24 + 0.57), respectively. 4.2) m Gy. Cm, (4.21 + 0.89) m Sv.4 method for the different parts of the pulmonary artery image quality subjective score and SNR comparison, the difference is not statistically significant (P0.05). Conclusion the 4 scanning methods have no significant difference in image quality, the large spiral distance of the double source CT is the smallest in the Flash mode radiation dose, DECT and 128-CT mode radiation dose not significantly different, 64-CT mode The radiation dose is the largest.
【作者单位】：苏州大学附属第一医院放射科;
【分类号】：R816.2

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