实用医技杂志
實用醫技雜誌
실용의기잡지
Journal of Practical Medical Techniques
2015年
9期
933-935
,共3页
脑血管造影术%体层摄影术,X线计算机%辐射剂量
腦血管造影術%體層攝影術,X線計算機%輻射劑量
뇌혈관조영술%체층섭영술,X선계산궤%복사제량
Cerebral angiography%Tomography,X-ray computed%Radiation dosage
目的:探讨双源CT前瞻性心电触发序列(SAS)扫描模式,脑血管成像的图像质量及辐射剂量。方法将84例临床怀疑或确诊的脑血管性病变的患者按照随机数字表法分为A,B 2组。 A组43例行前瞻性心电触发序列模式的脑血管CTA(SAS-CTA)扫描,采集期相:应用60%R-R间期的心电图(ECG)演示模式;B组41例行双能量CTA(DE-CTA)扫描。对2组患者脑血管CTA分别做图像后处理,应用两独立样本t检验方法统计分析图像质量评分及辐射剂量,并评价优良率。结果 A组图像质量评分为4.7±0.5,优良率达98%(42/43),B组图像质量评分为4.7±0.5,优良率达98%(40/41),2组间图像质量评分差异无统计学意义(t=0.443,P=0.903)。 A组扫描范围为(138.5±2.9) mm,B组为(139.3±0.8) mm,2组间扫描范围差异无统计学意义(t=0.685,P=0.074)。A组平均有效剂量及平均曝光时间分别为(0.216±0.01) mSv和(0.92±0.11) s, B组分别为(0.541±0.04) mSv和(2.33±0.10) s,2组间平均有效剂量及平均曝光时间差异有统计学意义(t=-53.086,t=0.902,P=0.000)。 SAS-CTA有效辐射剂量与DE-CTA比较降幅达到60.01%。结论前瞻性心电触发序列模式应用于脑血管成像,可在保证图像质量的同时显著降低辐射剂量。
目的:探討雙源CT前瞻性心電觸髮序列(SAS)掃描模式,腦血管成像的圖像質量及輻射劑量。方法將84例臨床懷疑或確診的腦血管性病變的患者按照隨機數字錶法分為A,B 2組。 A組43例行前瞻性心電觸髮序列模式的腦血管CTA(SAS-CTA)掃描,採集期相:應用60%R-R間期的心電圖(ECG)縯示模式;B組41例行雙能量CTA(DE-CTA)掃描。對2組患者腦血管CTA分彆做圖像後處理,應用兩獨立樣本t檢驗方法統計分析圖像質量評分及輻射劑量,併評價優良率。結果 A組圖像質量評分為4.7±0.5,優良率達98%(42/43),B組圖像質量評分為4.7±0.5,優良率達98%(40/41),2組間圖像質量評分差異無統計學意義(t=0.443,P=0.903)。 A組掃描範圍為(138.5±2.9) mm,B組為(139.3±0.8) mm,2組間掃描範圍差異無統計學意義(t=0.685,P=0.074)。A組平均有效劑量及平均曝光時間分彆為(0.216±0.01) mSv和(0.92±0.11) s, B組分彆為(0.541±0.04) mSv和(2.33±0.10) s,2組間平均有效劑量及平均曝光時間差異有統計學意義(t=-53.086,t=0.902,P=0.000)。 SAS-CTA有效輻射劑量與DE-CTA比較降幅達到60.01%。結論前瞻性心電觸髮序列模式應用于腦血管成像,可在保證圖像質量的同時顯著降低輻射劑量。
목적:탐토쌍원CT전첨성심전촉발서렬(SAS)소묘모식,뇌혈관성상적도상질량급복사제량。방법장84례림상부의혹학진적뇌혈관성병변적환자안조수궤수자표법분위A,B 2조。 A조43례행전첨성심전촉발서렬모식적뇌혈관CTA(SAS-CTA)소묘,채집기상:응용60%R-R간기적심전도(ECG)연시모식;B조41례행쌍능량CTA(DE-CTA)소묘。대2조환자뇌혈관CTA분별주도상후처리,응용량독립양본t검험방법통계분석도상질량평분급복사제량,병평개우량솔。결과 A조도상질량평분위4.7±0.5,우량솔체98%(42/43),B조도상질량평분위4.7±0.5,우량솔체98%(40/41),2조간도상질량평분차이무통계학의의(t=0.443,P=0.903)。 A조소묘범위위(138.5±2.9) mm,B조위(139.3±0.8) mm,2조간소묘범위차이무통계학의의(t=0.685,P=0.074)。A조평균유효제량급평균폭광시간분별위(0.216±0.01) mSv화(0.92±0.11) s, B조분별위(0.541±0.04) mSv화(2.33±0.10) s,2조간평균유효제량급평균폭광시간차이유통계학의의(t=-53.086,t=0.902,P=0.000)。 SAS-CTA유효복사제량여DE-CTA비교강폭체도60.01%。결론전첨성심전촉발서렬모식응용우뇌혈관성상,가재보증도상질량적동시현저강저복사제량。
Objective Experiments were carried out to test the hypothesis that using prospective ECG-triggering acquisition, also called "step-and-shoot" (SAS) mode on head can reduce radiation dose without compromising image quality compared with using conventional dual energy CTA scan. Methods Eighty-four patients with clinically suspected or confirmed cerebrovascular disease were randomly divided into 2 groups: Group A (43 patients underwent prospective ECG-triggering combined with "step-and-shoot" acquisition) and Group B (41 patients, underwent conventional dual-energy scanning). Images were reconstructed at 60% R-R interval. All images were processed on workstation and the image qualities of these images were scored by two experienced radiologists. These image scores and radiation doses used in each group were subjected to statistical analysis using the paired-sample t-test. Results The image quality score for group A was 4.7±0.5 with a good rate of 98%(42/43) and 4.7±0.5 for group B with a rate of 98%(40/41). The difference in the scores of image quality, between two groups was not statistically significant (P=0.903). The average effective dose was(0.216±0.01) mSv in group A and(0.541±0.04) mSv in group B. T-test results showed that the effective dose for the two groups were statistical different(P=0.000). Conclusion Compared with conventional mode, SAS mode with a narrow R-R interval can be applied to perform cerebral CTA with a dose reduction by 60%and produced similar image quality.