中国介入影像与治疗学
中國介入影像與治療學
중국개입영상여치료학
CHINESE JOURNAL OF INTERVENTIONAL IMAGING AND THERAPY
2009年
6期
563-566
,共4页
韦进%王小文%吴广仕%麦兆绵%揭育添
韋進%王小文%吳廣仕%麥兆綿%揭育添
위진%왕소문%오엄사%맥조면%게육첨
低剂量%非螺旋扫描%体层摄影术%X线计算机%肺结节
低劑量%非螺鏇掃描%體層攝影術%X線計算機%肺結節
저제량%비라선소묘%체층섭영술%X선계산궤%폐결절
Low-dose%Non-spiral scan%Tomography,X-ray computed%Lung nodules
目的 探讨4排螺旋CT非螺旋低剂量扫描方式在肺结节诊断中的价值.方法 对30例胸片可疑肺结节患者分别行螺旋低剂量和非螺旋低剂量扫描.采用Toshiba 4排多层螺旋CT(Asteion 4)扫描机.螺旋扫描采用预设35.5 mAs,床进20 mm/圈(即螺距1),0.75 s/圈,非螺旋扫描预设24 mAs,床进20 mm/圈(层厚＝层距),0.48 s/圈,其他扫描参数相同:120 kV,准直0.5×4,DFOV 300 mm,重建层厚5mm.根据出现伪影程度及是否分辨出肺结节来评价CT图像质量,对肺结节进行简单计数.比较两者发现肺结节的差异及有效放射剂量的差异.结果两种扫描方式检查30例患者均为阳性,发现各种肺结节都是108个.非螺旋扫描的有效放射剂量低于螺旋扫描方式(P<0.001).结论 非螺旋方式扫描与螺旋方式扫描在胸部低剂量检查中对于肺内病灶的发现及诊断无统计学差异,扫描剂量相对更低的非螺旋方式扫描应用于胸部疾病的诊断及筛查是可行的.
目的 探討4排螺鏇CT非螺鏇低劑量掃描方式在肺結節診斷中的價值.方法 對30例胸片可疑肺結節患者分彆行螺鏇低劑量和非螺鏇低劑量掃描.採用Toshiba 4排多層螺鏇CT(Asteion 4)掃描機.螺鏇掃描採用預設35.5 mAs,床進20 mm/圈(即螺距1),0.75 s/圈,非螺鏇掃描預設24 mAs,床進20 mm/圈(層厚＝層距),0.48 s/圈,其他掃描參數相同:120 kV,準直0.5×4,DFOV 300 mm,重建層厚5mm.根據齣現偽影程度及是否分辨齣肺結節來評價CT圖像質量,對肺結節進行簡單計數.比較兩者髮現肺結節的差異及有效放射劑量的差異.結果兩種掃描方式檢查30例患者均為暘性,髮現各種肺結節都是108箇.非螺鏇掃描的有效放射劑量低于螺鏇掃描方式(P<0.001).結論 非螺鏇方式掃描與螺鏇方式掃描在胸部低劑量檢查中對于肺內病竈的髮現及診斷無統計學差異,掃描劑量相對更低的非螺鏇方式掃描應用于胸部疾病的診斷及篩查是可行的.
목적 탐토4배라선CT비라선저제량소묘방식재폐결절진단중적개치.방법 대30례흉편가의폐결절환자분별행라선저제량화비라선저제량소묘.채용Toshiba 4배다층라선CT(Asteion 4)소묘궤.라선소묘채용예설35.5 mAs,상진20 mm/권(즉라거1),0.75 s/권,비라선소묘예설24 mAs,상진20 mm/권(층후＝층거),0.48 s/권,기타소묘삼수상동:120 kV,준직0.5×4,DFOV 300 mm,중건층후5mm.근거출현위영정도급시부분변출폐결절래평개CT도상질량,대폐결절진행간단계수.비교량자발현폐결절적차이급유효방사제량적차이.결과량충소묘방식검사30례환자균위양성,발현각충폐결절도시108개.비라선소묘적유효방사제량저우라선소묘방식(P<0.001).결론 비라선방식소묘여라선방식소묘재흉부저제량검사중대우폐내병조적발현급진단무통계학차이,소묘제량상대경저적비라선방식소묘응용우흉부질병적진단급사사시가행적.
Objective To explore the value of non-spiral mode of low-dose chest scan in diagnosis of pulmonary nodules.Methods Thirty patients with chest X-ray suspected pulmonary nodules underwent spiral low-dose and non-spiral low-dose CT scan under Toshiba 4 row multi-slice spiral CT (Asteion 4).The parameters were defaulted as 35.5 mAs,20 mm/ round (pitch=l),0.75 s/rot in spiral scan,while in non-spiral scan wree defaulted as 24 mAs,20 mm/round (thickness = layer distance),0.48 s/rot.Other parameters including 120 kV,collimator 0.5×4,DFOV 300 mm,reconstruction slice thickness 5 mm were chosen in both scans.CT imaging quality was evaluated according to the degreex of image artifacts and the distinguishment of nodule,and the pulmonary nodules were counted,then the differences of finding the pulmonary nodules and effective radiation dose of both mode were analyzed.Results The images were good in one patient in both scanning mode,and excellent in 29 patients in spiral scanning mode,28 patients in non-spiral scanning mode.A total of 108 nodules were found with two modes.The effective radiation dose in non-spiral scan was lower than that in spiral scan.No significant difference was found between non-spiral mode scanning and spiral scanning mode in the low-dose chest examination in the discovery and diagnosis of pulmonary nodules.Conclusion Lower dose of non-spiral scanning mode is feasible in diagnosis of pulmonary nodules.
