低剂量CT扫描在颅脑术后复查中的应用价值

Application value of low-dose CT scan in post-cranial reexamination

目的探讨头颅低剂量CT扫描在颅脑术后复查中的应用价值。方法选取安徽医科大学第一附属医院2018年11月至2019年1月72例颅脑术后复查病人,按随机数字表法分为三组,每组各24例。采用管电压均为120 kV,管电流分别为300 mA、200 mA、160 mA进行扫描,分别记录剂量长度乘积(DLP)、CT剂量指数(CTDI),并比较三种扫描方式的图像质量。结果低剂量CT扫描使图像噪声增加,图像质量下降(P<0.001)。虽然160 mA扫描条件剂量最低,CTDI为(20.80±3.71)mGy,DLP为(291.26±14.02)mGy·cm,但图像质量明显下降,影响疾病诊断;200 mA组与300 mA组相比图像质量虽有所下降,但并不影响对疾病的诊断,而且其CTDI和DLP分别为(26.01±3.25)mGy和(364.08±12.76)mGy·cm,明显低于300 mA的(38.62±5.64)mGy和(540.71±21.53)mGy·cm。差异有统计学意义(P<0.05)。结论200 mA头颅低剂量CT扫描对颅脑术后复查病人是可行的,且辐射剂量明显降低。

Objective To evaluate the application value of low dose CT scan in craniocerebral surgery.Methods A total of 72 patients reexamined after craniocerebral surgery in The First Affiliated Hospital of Anhui Medical University from November 2018 to January 2019 were selected and assigned into three groups according to the random number table method,with 24 patients in each group.The tube voltage was 120 kV,and the tube current was 300 mA,200 mA and 160 mA,respectively.Dose-length product(DLP)and CT dose index(CTDI)were recorded,and the image quality of the three scanning methods was compared.Results Low dose CT scan makes the image noise increase and the image quality decrease(P<0.001).Although the conditional dose of 160 mA scan was the lowest,CTDI was(20.80±3.71)mGy,and DLP was(291.26±14.02)mGy·cm,the image quality significantly decreased,affecting the diagnosis of the disease.Although the image quality of the 200 mA group decreased compared with the 300 mA group,it did not affect the diagnosis of the disease,and the CTDI and DLP were(26.01±3.25)mGy and(364.08±12.76)mGy·cm,respectively,which were significantly lower than the(38.62±5.64)mGy and(540.71±21.53)mGy·cm of 300 mA,and the difference was statistically significant(P<0.05).Conclusion A low dose cranial CT scan of 200 mA is feasible for patients revisiting after craniocerebral surgery,and the radiation dose is significantly reduced.