摘要
目的探讨低剂量迭代重建技术CT扫描在颅脑外伤的可行性及临床价值。资料与方法对120例颅脑外伤患者随机分组,分别行常规剂量滤波反投影法(FBP组)及i Dose法(2/3剂量组和1/2剂量组)CT检查。采用4分法对各组图像噪声、颅底伪影、灰白质对比及病变显示进行主观评价。比较各组图像的噪声水平、信噪比(SNR)、灰白质对比噪声比(CNR)及剂量长度乘积(DLP)。结果 2/3剂量i Dose组和1/2剂量i Dose组图像质量低于FBP组,但均满足诊断要求。2/3剂量i Dose组和1/2剂量i Dose组图像的噪声水平高于FBP组(P<0.05),SNR及CNR均低于FBP组(P<0.05)。3组DLP比较差异有统计学意义(F=2751.46,P<0.05);2/3剂量i Dose组和1/2剂量i Dose组DLP明显低于FBP组,差异有统计学意义(P<0.05)。结论 i Dose技术在颅脑外伤CT检查中能有效降低辐射剂量,虽然噪声水平较高,SNR和CNR较低,但图像质量与显示病变能力能达到要求,在临床上有应用价值。
PurposeTo evaluate the feasibility and clinical values of CT scan with iterative reconstruction and low radiating dose in craniocerebral trauma.Material and Methods 120 patients suffered from craniocerebral trauma were randomly assigned. All the subjects underwent CT scan using route dose of filtered back projection （FBP） and low dose of iDose （2/3 dose and 1/2 dose）, respectively. The quartering were used to subjectively evaluate noise of imaging, skull base artifact, contrast of gyrus-white matter and lesion display in each group. Imaging noise, signal and noise rate （SNR）, contrast and noise rate （CNR） of gyrus-white matter and dose length product （DLP） were compared.Results The image quality of both2/3 iDose and 1/2 iDose groups were lower than that of FBP group, but still met the requirement of diagnosis. The image noise of both 2/3 iDose and 1/2iDose groups were higher than that of FBP group （P〈0.05）. The SNR and CNR of both 2/3 iDose and 1/2 iDose groups were lower than those of FBP group （P〈0.05）. The DLP of both2/3 iDose and 1/2 iDose groups were lower than that of FBP group. There was statistical difference between iDose groups and FBP group （F=2751.46,P〈0.05）.Conclusion Application of iDose could effectively decrease radiation dose in craniocerebral trauma. Although iDose technique has higher noise level and lower SNR and CNR, the imaging qualities and capability of displaying abnormity meet diagnosis requirement. So that iDose has clinical significance.
出处
《中国医学影像学杂志》
CSCD
北大核心
2015年第3期165-168,共4页
Chinese Journal of Medical Imaging
关键词
脑损伤
体层摄影术
螺旋计算机
迭代重建算法
图像处理
计算机辅助
辐射剂量
Brain injuries
Tomography, spiral computed
Iterative reconstruction algorithm
Image processing, computer-assisted
Radiation dosage
