管电流自动调节技术在儿童腹部CT中的应用

发布时间：2019-02-12 21:30

【摘要】：目的探讨64排螺旋CT管电流自动调节扫描和传统方法扫描在儿童腹部检查中的应用价值。方法将60例接受腹部扫描的患儿分为管电流自动调节扫描组(管电压120kV,管电流采用预设噪声指数为10的自动管电流,A组,n=30)和传统方法扫描组(管电压120kV,管电流150mAs,B组,n=30)。对两组的腹部图像进行定量评价,并对比两组的CT辐射剂量。结果 A、B两组腹部图像中腹主动脉、竖脊肌、肝实质、脾、肾实质的CT值,噪声及SNR差异均无统计学意义(P均0.05)。A组的容积CT剂量指数(CTDIvol)为(4.59±0.81)mGy,剂量长度乘积(DLP)为(147.58±35.77)mGy·cm,有效剂量(ED)为(4.42±1.07)mSv;B组的CTDIvol、DLP及ED分别为(6.70±0.001)mGy、(214.24±21.65)mGy·cm及(6.41±0.64)mSv。两组间差异均有统计学意义(P均0.01)。结论 64排螺旋CT儿童腹部检查中采用管电流自动调节扫描方法,有利于在满足诊断需求的前提下有效减低辐射剂量。
[Abstract]:Objective to investigate the application value of 64 row spiral CT tube current automatic adjustment scan and traditional scanning method in abdominal examination of children. Methods 60 children undergoing abdominal scan were divided into two groups: the tube voltage was 120kV, the tube current was the automatic current with a preset noise index of 10 (group A, n = 30) and the traditional scanning group (the tube voltage was 120kV, the tube current was 150mAs. Group B (n = 30). The abdominal images of the two groups were quantitatively evaluated and the dose of CT was compared between the two groups. Results the CT values of abdominal aorta, erector spinal muscle, liver parenchyma, spleen and kidney parenchyma were measured in group A and B. There was no significant difference in noise and SNR (P < 0. 05). The volume CT dose index (CTDIvol) was (4. 59 卤0. 81) mGy, dose length product (DLP) was (147.58 卤35.77) mGy cm,). The effective dose of (ED) was (4.42 卤1.07) mSv;. CTDIvol,DLP and ED were (6.70 卤0.001) mGy, (214.24 卤21.65) mGy cm) and (6.41 卤0.64) mSv. in group B, respectively. There was significant difference between the two groups (P 0.01). Conclusion the method of automatic tube current adjusting scanning in 64 row spiral CT children's abdominal examination is helpful to reduce the radiation dose under the condition of satisfying the diagnosis requirement.
【作者单位】：重庆医科大学附属儿童医院放射科;
【基金】：重庆市自然科学基金(CSCT 2010BB 53797)
【分类号】：R816.92

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