实用放射学杂志
實用放射學雜誌
실용방사학잡지
JOURNAL OF PRACTICAL RADIOLOGY
2014年
7期
1206-1209
,共4页
冠状动脉造影术%计算机体层成像%迭代重建%图像质量%辐射剂量
冠狀動脈造影術%計算機體層成像%迭代重建%圖像質量%輻射劑量
관상동맥조영술%계산궤체층성상%질대중건%도상질량%복사제량
coronary angiography%computed tomography%iterative reconstruction%image quality%radiation dose
目的:评估冠状动脉 CTA 应用低管电压结合迭代重建(IR)降低辐射剂量的同时,维持图像质量及诊断准确性。方法50例疑诊冠心病的连续性患者(体质量指数<30 kg/m2)行冠状动脉 CTA 检查。管电压设定为100 kVp,管电流为186 mAs。图像采用基于原始数据的滤波反投影法(FBP)和 IR 重建。图像质量得分采用5分法(1=差,5=优)。以冠状动脉造影为金标准,检测 FBP 和 IR 诊断冠状动脉狭窄≥50%的准确性。结果患者的平均辐射剂量为(0.6±0.2)mSv。节段水平上,诊断≥50%冠状动脉狭窄的敏感性在 FBP 与 IR 分别为73.0%和82.0%,特异性分别为93.3%和96.9%(P 均<0.05)。IR 的图像质量得分高于 FBP(4.0±0.5 vs 3.4±0.6,P <0.05)。结论低管电压结合迭代重建在冠状动脉成像中提供了良好的图像质量及诊断准确性,且辐射剂量<1 mSv。
目的:評估冠狀動脈 CTA 應用低管電壓結閤迭代重建(IR)降低輻射劑量的同時,維持圖像質量及診斷準確性。方法50例疑診冠心病的連續性患者(體質量指數<30 kg/m2)行冠狀動脈 CTA 檢查。管電壓設定為100 kVp,管電流為186 mAs。圖像採用基于原始數據的濾波反投影法(FBP)和 IR 重建。圖像質量得分採用5分法(1=差,5=優)。以冠狀動脈造影為金標準,檢測 FBP 和 IR 診斷冠狀動脈狹窄≥50%的準確性。結果患者的平均輻射劑量為(0.6±0.2)mSv。節段水平上,診斷≥50%冠狀動脈狹窄的敏感性在 FBP 與 IR 分彆為73.0%和82.0%,特異性分彆為93.3%和96.9%(P 均<0.05)。IR 的圖像質量得分高于 FBP(4.0±0.5 vs 3.4±0.6,P <0.05)。結論低管電壓結閤迭代重建在冠狀動脈成像中提供瞭良好的圖像質量及診斷準確性,且輻射劑量<1 mSv。
목적:평고관상동맥 CTA 응용저관전압결합질대중건(IR)강저복사제량적동시,유지도상질량급진단준학성。방법50례의진관심병적련속성환자(체질량지수<30 kg/m2)행관상동맥 CTA 검사。관전압설정위100 kVp,관전류위186 mAs。도상채용기우원시수거적려파반투영법(FBP)화 IR 중건。도상질량득분채용5분법(1=차,5=우)。이관상동맥조영위금표준,검측 FBP 화 IR 진단관상동맥협착≥50%적준학성。결과환자적평균복사제량위(0.6±0.2)mSv。절단수평상,진단≥50%관상동맥협착적민감성재 FBP 여 IR 분별위73.0%화82.0%,특이성분별위93.3%화96.9%(P 균<0.05)。IR 적도상질량득분고우 FBP(4.0±0.5 vs 3.4±0.6,P <0.05)。결론저관전압결합질대중건재관상동맥성상중제공료량호적도상질량급진단준학성,차복사제량<1 mSv。
Objective To evaluate the diagnostic accuracy of coronary CT angiography (CCTA)using low tube settings combined with iterative reconstruction (IR),while substantially reduced radiation dose.Methods Fifty consecutive patients suspicious of coro-nary artery disease (Body mass index <30 kg/m2 )underwent coronary CT angiography.Tube voltage was set to 100 kVp,tube current-time product was set to 186 mAs.Images were reconstructed with raw-data based filtered back projection and sinogram-af-firmed iterative reconstruction.Image quality was scored according to five categories (1 =poor,5 =excellent).Diagnostic perform-ance for detection of ≥50% coronary artery stenosis was determined by invasive coronary angiography as the reference.Results Me-dian effective dose was 0.6 ± 0.2 mSv.Sensitivity for diagnosing ≥50% coronary artery stenosis on per-segment level were 73.0%with FBP and 82.0% with IR,and specificity were 93.3% with FBP and 96.9% with IR(all P <0.05),respectively.The mean im-age quality score was higher for IR than FBP (4.0 ± 0.5 vs 3.4 ± 0.6,P <0.05).Conclusion Coronary CT angiography provided good image quality and diagnostic accuracy through the combination of low tube settings with iterative reconstruction,while radiation doses consistently below 1 mSv.