第3代双源CT低管电压70kV联合高级模拟迭代重建在结肠CT成像中的应用
发布时间:2018-07-16 12:33
【摘要】:目的探讨第3代双源CT低管电压70 kV联合高级模拟迭代重建技术(ADMIRE)在降低结肠CT辐射剂量方面的可行性。方法前瞻性连续入组53例患者行结肠CT检查,仰卧位为120 kV标准低剂量扫描,采用滤波反投影法进行图像重建;俯卧位为70 kV扫描,然后采用ADMIRE进行图像重建,扫描范围一致;比较两者辐射剂量、图像质量等方面的差异。结果 70 kV的CT容积剂量指数、剂量长度乘积和有效剂量分别为(1.47±0.23)m Gy、(68.85±13.82)m Gy·cm和(1.03±0.21)m Sv,明显低于120 kV的(2.96±0.61)m Gy(t=25.356,P=0.000)、(136.97±32.77)m Gy·cm(t=22.246,P=0.000)和(2.05±0.49)m Sv(t=22.293,P=0.000)。70 kV联合ADMIRE的信噪比为3.60±0.58,明显高于120 kV的2.34±0.47(t=-18.036,P=0.000);噪声为(11.81±1.93)HU,明显低于120 kV的(14.39±2.57)HU(t=7.856,P=0.000)。两位放射科医师主观评分总体κ值为0.843(P=0.000)。二维图像结果显示,70 kV联合ADMIRE的噪声明显低于120 kV(Z=325.000,P=0.000)、图像总体质量评分明显高于120 kV(Z=78.000,P=0.001),两者的锐利度差异无统计学意义(Z=12.000,P=0.180),所有评分均为4~5分。三维虚拟内镜图像结果显示,70 kV联合ADMIRE和120 kV在图像总体质量方面差异无统计学意义(Z=4.000,P=0.059),所有评分均在4~5分。结论第3代双源CT低管电压70 kV联合ADMIRE较120 kV常规扫描,可在保证结肠CT图像质量的同时,显著降低辐射剂量。
[Abstract]:Objective to investigate the feasibility of the third generation dual-source CT low tube voltage 70 kV combined with advanced simulated iterative reconstruction (ADMIRE) in reducing the radiation dose of colon CT. Methods Colon CT scan was performed in 53 consecutive prospective patients, with 120 kV standard low dose scan in supine position, 70 kV scan in prone position and 70 kV scan in prone position. The difference of radiation dose, image quality and so on was compared. 缁撴灉 70 kV鐨凜T瀹圭Н鍓傞噺鎸囨暟,鍓傞噺闀垮害涔樼Н鍜屾湁鏁堝墏閲忓垎鍒负(1.47卤0.23)m Gy,(68.85卤13.82)m Gy路cm鍜,
本文编号:2126403
[Abstract]:Objective to investigate the feasibility of the third generation dual-source CT low tube voltage 70 kV combined with advanced simulated iterative reconstruction (ADMIRE) in reducing the radiation dose of colon CT. Methods Colon CT scan was performed in 53 consecutive prospective patients, with 120 kV standard low dose scan in supine position, 70 kV scan in prone position and 70 kV scan in prone position. The difference of radiation dose, image quality and so on was compared. 缁撴灉 70 kV鐨凜T瀹圭Н鍓傞噺鎸囨暟,鍓傞噺闀垮害涔樼Н鍜屾湁鏁堝墏閲忓垎鍒负(1.47卤0.23)m Gy,(68.85卤13.82)m Gy路cm鍜,
本文编号:2126403
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