| 汪素涵,刘昌盛,查云飞.低剂量与常规剂量16排螺旋CT扫描泌尿系结石的对比研究[J].中华放射医学与防护杂志,2011,31(4):497-500.WANG Su-han,LIU Chang-sheng,ZHA Yun-fei.Comparison of standard-dose and low-dose scanning with 16-MDCT for urinary calculi[J].Chin J Radiol Med Prot,2011,31(4):497-500 |
| 低剂量与常规剂量16排螺旋CT扫描泌尿系结石的对比研究 |
| Comparison of standard-dose and low-dose scanning with 16-MDCT for urinary calculi |
| 投稿时间：2010-06-29 |
| DOI：10.3760/cma.j.issn.0254-5098.2011.04.035 |
| 中文关键词: 泌尿系结石 辐射剂量 体层摄影术 X射线计算机 |
| 英文关键词:Urinary calculi Radiation dosage Tomography X-ray computer |
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| 中文摘要: |
| 目的 探讨根据体重指数(BMI)大小采用不同低剂量螺旋CT检查泌尿系结石的可行性。方法 对2009年9月至2010年2月本院100例临床拟诊泌尿系结石的患者,其中50例进行螺旋CT常规剂量(120 kV、240 mA)扫描,另外50例根据体重指数大小分别采用120、80和50 mA行低剂量扫描,其他扫描条件与常规剂量组相同。以临床诊断结果为标准,对比分析2种方法诊断泌尿系结石的敏感性、准确性和阳性预测值。结果 常规剂量组和低剂量组的剂量长度乘积(DLP)分别为(726.58±45.67)和(251.12±73.87)mGy·cm,CT剂量指数(CTDIvol)分别为18.95和6.65 mGy,两组辐射剂量差异有统计学意义(t=31.78,P<0.01)。低剂量扫描检查结石的敏感性为97.1%、准确性为94.0%、阳性预测值为94.3%,与常规剂量扫描组(97.3%、96.0%、97.3%)相比,差异无统计学意义(P>0.05)。结论 根据患者的体重指数采用不同的低剂量检查泌尿系结石是可行的,获得的图像质量可以满足临床诊断要求。 |
| 英文摘要: |
| Objective To explore the feasibility to diagnose ureterolithiasis by 16-multidetector spiral computed tomography (16-MDCT) at different low doses based on body mass index (BMI). Methods A total of one hundred patients from 2009 Sep to 2010 Feb suspected of ureterolithiasis were randomly divided into 2 equal groups undergoing 16-MDCT at standard-dose (120 kV, 240 mA) or low-dose (120, 80, and 50 mA, respectively) based on the body mass index (BMI). Taking the clinical diagnosis as the standard, the sensitivity level, specificity level, and positive predictive value of these groups were compared. Results The dose length product (DLP) of the low-dose CT group and the standard dose group were (726.58±45.67) and (251.12±73.87) mGy·cm, respectively, and the average CT dose index (CTDIvol) were 18.95 and 6.65 mGy, respectively. There was significant difference between the two groups(t=31.78, P<0.01). The sensitivity level, specificity level, and positive predictive value of the low-dose group were 97.1%, 94.0%, and 94.3%, respectively, all not significantly different from those of the standard-dose groups (97.3%, 96.0%, and 97.3%, respectively,P>0.05). Conclusions It is feasible to diagnose ureterolithiasis by low-dose 16-MDCT based on BMI with the obtained image quality meeting the clinical diagnostic requirements. |
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