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
2014年
11期
870-871,880
,共3页
扫描方法%图像质量%辐射防护%下颌骨
掃描方法%圖像質量%輻射防護%下頜骨
소묘방법%도상질량%복사방호%하합골
Scanning method%Image quality%Radiation protection%Mandibular
目的 通过改变扫描位置优化下颌骨CT扫描方法降低辐射剂量.方法 50例下颌骨CT扫描的连续病例纳入本前瞻性对照研究,用随机数字表法分2组,各25例.分别进行体位优化法和常规法扫描,比较其图像质量、CT剂量加权指数(CTDIvol)、扫描范围长度(L)及剂量长度乘积(DLP).结果 体位优化法与常规法的下颌骨图像质量相同,两组的CTDIvol无明显差异,体位优化法扫描范围长度(L)和剂量长度乘积(DLP)比常规法分别下降20％(t=4.986,P＜0.05)和16％(￡=3.682,P＜0.05),并避开了晶状体.结论 体位优化法下颌骨扫描能有效减少扫描长度和避开晶状体,降低有效辐射剂量.
目的 通過改變掃描位置優化下頜骨CT掃描方法降低輻射劑量.方法 50例下頜骨CT掃描的連續病例納入本前瞻性對照研究,用隨機數字錶法分2組,各25例.分彆進行體位優化法和常規法掃描,比較其圖像質量、CT劑量加權指數(CTDIvol)、掃描範圍長度(L)及劑量長度乘積(DLP).結果 體位優化法與常規法的下頜骨圖像質量相同,兩組的CTDIvol無明顯差異,體位優化法掃描範圍長度(L)和劑量長度乘積(DLP)比常規法分彆下降20％(t=4.986,P＜0.05)和16％(￡=3.682,P＜0.05),併避開瞭晶狀體.結論 體位優化法下頜骨掃描能有效減少掃描長度和避開晶狀體,降低有效輻射劑量.
목적 통과개변소묘위치우화하합골CT소묘방법강저복사제량.방법 50례하합골CT소묘적련속병례납입본전첨성대조연구,용수궤수자표법분2조,각25례.분별진행체위우화법화상규법소묘,비교기도상질량、CT제량가권지수(CTDIvol)、소묘범위장도(L)급제량장도승적(DLP).결과 체위우화법여상규법적하합골도상질량상동,량조적CTDIvol무명현차이,체위우화법소묘범위장도(L)화제량장도승적(DLP)비상규법분별하강20％(t=4.986,P＜0.05)화16％(￡=3.682,P＜0.05),병피개료정상체.결론 체위우화법하합골소묘능유효감소소묘장도화피개정상체,강저유효복사제량.
Objective To Optimize the mandibular CT scanning methods with changing the scanning position,to reduce the radiation dosage.Methods Totally 50 consecutive patients with mandibular CT examination were enrolled in the study and divided into position-optimized group and routine group (n =25,respectively) randomly.The image quality,volume CT-dose index (CTDIvol),scanning length,and dose length product (DLP) were compared.Results There was no significant difference in subjective image quality and CTDIvol between two groups.But the scanning length and DLP in positionoptimized group were significantly reduced by about 20 ％ (t =4.986,P ＜ 0.05) and 16％ (t =3.682,P ＜0.05) compared with routine group.The lens were out of scanning field with the position-optimized protocol.Conclusions The scanning length would be efficiently reduced and the lens avoided with the position-optimized protocol,which would subsequently reduce the effective radiation dose.
