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目的探讨低剂量64排CT在低龄儿童肾脏肿瘤扫描中的可行性。方法利用GE的QA模体模仿低龄小儿体部,分别进行120 kV,50 mA、120 kV,25 mA以及120 kV,10 mA的扫描,记录三次不同扫描序列的CTDIvol及DLP。同时通过模体中线对的显示以及噪声的测量,评价相应的图像质量。结果以10 mA剂量扫描,CTDIvol为常规剂量的20.1%,图像质量较差,与常规剂量比较,差异有统计学意义(P<0.05);以25mA剂量扫描,CTDIvol为常规剂量的50.2%,图像质量较好,与常规剂量的图像比较,差异无统计学意义(P>0.05)。结论低剂量(25 mA)对低龄儿童肾脏肿瘤进行扫描,图像质量满足诊断要求的同时,能减少患儿接受的辐射剂量。
Objective To investigate the feasibility of low-dose 64-slice CT in the diagnosis of renal tumors in young children. Methods The GE QA phantom was used to simulate the body of a young child. The CT images were obtained at 120 kV, 50 mA, 120 kV, 25 mA, 120 kV and 10 mA, respectively. CTDIvol and DLP were recorded in three different scanning sequences. At the same time, the corresponding image quality is evaluated through the display of the line pair in the phantom and the measurement of the noise. Results The CTDIvol was 20.1% of the conventional dose and the image quality was poor. Compared with the conventional dose, the difference was statistically significant (P <0.05). At the dose of 25 mA, CTDIvol was 50.2% of the conventional dose and the CTDIvol was 20.2% Good quality, compared with conventional dose images, the difference was not statistically significant (P> 0.05). Conclusion Low-dose (25 mA) scan of renal tumors in young children can reduce the dose of radiation received by children with satisfactory diagnostic quality.