迭代重建技术对泌尿系结石低剂量CT图像质量的研究  

Study on the quality of low dose CT images of urolithiasis by iterative reconstruction technique

作　　者：苏丽兴 漆强[1] 钱会绒[1] 刘晓[1] 许团新[1] Su Lixing;Qi Qiang;Qian Huirong;Liu Xiao;Xu Tuanxin(Department of Radiology,Tungwah Hosipital,Dongguan 523000,China)

机构地区：[1]东莞东华医院放射科

出　　处：《实用医技杂志》2019年第9期1100-1102,共3页Journal of Practical Medical Techniques

摘　　要：目的对低剂量CT检查泌尿系统结石中迭代重建技术(i Dose)对CT图像质量的影响进行探讨,以期为进一步提高泌尿系统结石的临床诊断准确率提供参考。方法将我院于2017年8月至2018年6月期间接收的68例泌尿系统结石患者采用抽签的方式分为对照组(34例)与观察组(34例),对照组给予常规剂量扫描,观察组给予低剂量扫描,运用滤波反投影技术(FBP)及i Dose,对2组扫描图像进行重建,对患者病灶部位、数目及大小进行对比观察,并对2种扫描方式下图像质量、诊断可信度、图像噪声、辐射剂量进行对比分析。结果与对照组相比,观察组敏感度及特异度差异无统计学意义(P>0.05);在FBP重建下,观察组图像质量评分及诊断可信度均较低(P<0.05),且观察组i Dose1及i Dose2图像质量及诊断可信度均较低(P<0.05);在图像噪声方面,观察组FBP图像脂肪、肝右叶以及腰大肌噪声较高(P<0.05),观察组CT容积剂量指数、剂量长度乘积以及有效剂量均明显较低(P<0.05),2组体质量指数(BMI)<24 kg/m^2患者CT容积剂量指数、剂量长度乘积以及有效剂量均明显较本组BMI≥24 kg/m^2患者低(P<0.05)。结论将低剂量CT扫描应用于泌尿系统结石的诊断中可显著减少对患者的辐射,同时运用i Dose可有效改善图像质量,进一步提高诊断准确性,值得推广。Objective To investigate the effect of iterative reconstruction technique(i Dose)on the quality of CT images in low dose CT examination of urolithiasis in order to provide a reference for further improving the accuracy of clinical diagnosis of urolithiasis. Methods Sixty-eight patients with urinary calculi received in our hospital from August2017 to June 2018 were included in this study. The patients were divided into control group(34 cases) and observation group(34 cases) by drawing lots. The control group was given routine dose scan,the observation group was given low dose scan,and the filter back projection technique(FBP)and i Dose were used to reconstruct the two groups of scanning images,and the location,number and size of the lesions were compared and observed. The image quality,diagnostic reliability,image noise and radiation dose of the two scanning methods were compared and analyzed. Results There was no significant difference in sensitivity and specificity between the observation group and the control group(P>0.05). Under FBP reconstruction,the image quality score and diagnostic reliability of the observation group were significantly lower than those of the observation group(P<0.05),and the image quality and diagnostic reliability of the observation group were significantly lower than those of the control group(P<0.05),and the FB of the observation group was significantly lower than that of the control group in the aspect of image noise(P<0.05). P image fat,right lobe of liver and psoas major noise were significantly higher(P <0.05). In the radiation dose,the CT volume dose index,the dose length product and the effective dose were significantly lower in the observation group(P<0.05). The CT volume dose index of the patients with body mass index(BMI)<24 kg/m^2 was lower than that of the control group(P <0.05). The dose length product and effective dose were significantly lower than those of BMI ≥24 kg/m^2 patients(P<0.05). Conclusion The application of low-dose CT scan in the diagnosis of urolithiasis

关 键 词：尿路结石 体层摄影术 螺旋计算机 图像质量 

分 类 号：R691.4[医药卫生—泌尿科学] R816.7[医药卫生—外科学]