中华放射医学与防护杂志
中華放射醫學與防護雜誌
중화방사의학여방호잡지
Chinese Journal of Radiological Medicine and Protection
2011年
4期
497-500
,共4页
泌尿系结石%辐射剂量%体层摄影术%X射线计算机
泌尿繫結石%輻射劑量%體層攝影術%X射線計算機
비뇨계결석%복사제량%체층섭영술%X사선계산궤
Urinary calculi%Radiation dosage%Tomography%X-ray computer
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.
目的 探討根據體重指數(BMI)大小採用不同低劑量螺鏇CT檢查泌尿繫結石的可行性.方法 對2009年9月至2010年2月本院100例臨床擬診泌尿繫結石的患者,其中50例進行螺鏇CT常規劑量(120 kV、240 mA)掃描,另外50例根據體重指數大小分彆採用120、80和50 mA行低劑量掃描,其他掃描條件與常規劑量組相同.以臨床診斷結果為標準,對比分析2種方法診斷泌尿繫結石的敏感性、準確性和暘性預測值.結果 常規劑量組和低劑量組的劑量長度乘積(DLP)分彆為(726.58±45.67)和(251.12±73.87)mGy·cm,CT劑量指數(CTDIvol)分彆為18.95和6.65 mGy,兩組輻射劑量差異有統計學意義(t=31.78,P＜0.01).低劑量掃描檢查結石的敏感性為97.1%、準確性為94.0%、暘性預測值為94.3%,與常規劑量掃描組(97.3%、96.0%、97.3%)相比,差異無統計學意義(P＞0.05).結論 根據患者的體重指數採用不同的低劑量檢查泌尿繫結石是可行的,穫得的圖像質量可以滿足臨床診斷要求.
목적 탐토근거체중지수(BMI)대소채용불동저제량라선CT검사비뇨계결석적가행성.방법 대2009년9월지2010년2월본원100례림상의진비뇨계결석적환자,기중50례진행라선CT상규제량(120 kV、240 mA)소묘,령외50례근거체중지수대소분별채용120、80화50 mA행저제량소묘,기타소묘조건여상규제량조상동.이림상진단결과위표준,대비분석2충방법진단비뇨계결석적민감성、준학성화양성예측치.결과 상규제량조화저제량조적제량장도승적(DLP)분별위(726.58±45.67)화(251.12±73.87)mGy·cm,CT제량지수(CTDIvol)분별위18.95화6.65 mGy,량조복사제량차이유통계학의의(t=31.78,P＜0.01).저제량소묘검사결석적민감성위97.1%、준학성위94.0%、양성예측치위94.3%,여상규제량소묘조(97.3%、96.0%、97.3%)상비,차이무통계학의의(P＞0.05).결론 근거환자적체중지수채용불동적저제량검사비뇨계결석시가행적,획득적도상질량가이만족림상진단요구.
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 lowdose (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 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.
