中国实用医刊
中國實用醫刊
중국실용의간
CENTRAL PLAINS MEDICAL JOURNAL
2014年
21期
54-56
,共3页
低心率%CT%冠脉造影
低心率%CT%冠脈造影
저심솔%CT%관맥조영
Low heart rate%CT%Coronary angiography
目的 分析双源CT心电触发大扫描行冠脉造影对低心率患者的图像质量及放射剂用量.方法 选择2013年1月至1013年12月收治的72例行冠脉造影患者做为研究对象,将所有患者按照心率的高低分为低心率组(＜60次/min)和对照组(＞65次/min)均采用双源CT使用Flash扫描模式(前瞻性心电触发选60％ R-R间期)行冠状动脉成像.参数设置层数128,层厚0.6 mm,旋转时间0.28 s.于75 ms时间分辨率行图像重建,螺距3.4,层厚0.75 mm,间隔0.6 mm,由2名经验医师采用4级评估法,1～3级图像可评估,4级不可评估;再根据美国心脏学会冠脉分段法,对各段图像质量行评估.结果 72例患者共评价1096个冠脉节段,其中1级节段926段,2级节段128段,3级节段26段,4级节段16段.低心率组可评价节段为97.2％,对照组可评价节段为88.4％,两组可评价节段比较差异有统计学意义(P＜0.05);低心率组扫描辐射剂量为(0.95±0.42)mSv,对照组(1.25±0.35) mSv,两组比较差异有统计学意义.结论 对于稳定而且心率＜60次/min的患者,在60％ R-R间期双源CT心电触发大螺距CT扫描采集图像所得评价级别高,且辐射剂量明显偏低.
目的 分析雙源CT心電觸髮大掃描行冠脈造影對低心率患者的圖像質量及放射劑用量.方法 選擇2013年1月至1013年12月收治的72例行冠脈造影患者做為研究對象,將所有患者按照心率的高低分為低心率組(＜60次/min)和對照組(＞65次/min)均採用雙源CT使用Flash掃描模式(前瞻性心電觸髮選60％ R-R間期)行冠狀動脈成像.參數設置層數128,層厚0.6 mm,鏇轉時間0.28 s.于75 ms時間分辨率行圖像重建,螺距3.4,層厚0.75 mm,間隔0.6 mm,由2名經驗醫師採用4級評估法,1～3級圖像可評估,4級不可評估;再根據美國心髒學會冠脈分段法,對各段圖像質量行評估.結果 72例患者共評價1096箇冠脈節段,其中1級節段926段,2級節段128段,3級節段26段,4級節段16段.低心率組可評價節段為97.2％,對照組可評價節段為88.4％,兩組可評價節段比較差異有統計學意義(P＜0.05);低心率組掃描輻射劑量為(0.95±0.42)mSv,對照組(1.25±0.35) mSv,兩組比較差異有統計學意義.結論 對于穩定而且心率＜60次/min的患者,在60％ R-R間期雙源CT心電觸髮大螺距CT掃描採集圖像所得評價級彆高,且輻射劑量明顯偏低.
목적 분석쌍원CT심전촉발대소묘행관맥조영대저심솔환자적도상질량급방사제용량.방법 선택2013년1월지1013년12월수치적72례행관맥조영환자주위연구대상,장소유환자안조심솔적고저분위저심솔조(＜60차/min)화대조조(＞65차/min)균채용쌍원CT사용Flash소묘모식(전첨성심전촉발선60％ R-R간기)행관상동맥성상.삼수설치층수128,층후0.6 mm,선전시간0.28 s.우75 ms시간분변솔행도상중건,라거3.4,층후0.75 mm,간격0.6 mm,유2명경험의사채용4급평고법,1～3급도상가평고,4급불가평고;재근거미국심장학회관맥분단법,대각단도상질량행평고.결과 72례환자공평개1096개관맥절단,기중1급절단926단,2급절단128단,3급절단26단,4급절단16단.저심솔조가평개절단위97.2％,대조조가평개절단위88.4％,량조가평개절단비교차이유통계학의의(P＜0.05);저심솔조소묘복사제량위(0.95±0.42)mSv,대조조(1.25±0.35) mSv,량조비교차이유통계학의의.결론 대우은정이차심솔＜60차/min적환자,재60％ R-R간기쌍원CT심전촉발대라거CT소묘채집도상소득평개급별고,차복사제량명현편저.
Objective To analyze the quality of image and radiation dose of double source CT coronary angiography using electrocardiogram-triggered high-pitch spiral mode in low heart rate patients.Methods A total of 72 patients who received coronary angiography from January 2013 to December 2013 were selected as subjects.All of the patients were divided into the low heart rate group (＜ 60 bpm) and the control group (＞ 65 bpm).The double source CT coronary angiography adopted the Flash scanning mode (the prospective electrocardiogram-triggering selected 60％ R-R interval).The number of layers was 128,the thickness of layer was 0.6 mm and the rotation time was 0.28 s.The 75 ms time temporal resolution was adopted for image reconstruction,the pitch was 3.4,the thickness of layer was 0.75 mm and the interval was 0.6 mm.The images were assessed by 2 experienced doctors with four grades assessment method,grade 1-3 images were assessable and grade 4 images were unassessable.The image quality of each segment was assessed based on the coronary artery segmentation method of American Heart Association.Results A total of 1096 coronary artery segments of 72 patients were assessed,including 926 grade 1 segments,128 grade 2 segments,26 grade 3 segments and 16 grade 4 segments.The assessable segments accounted for 97.2％ in the low heart rate group and 88.4％ in the control group,there were significant differences (P ＜0.05).The radiation dose was (0.95 ± 0.42)mSv in the low heart rate group and (1.25 ± 0.35) mSv in the control group,there was significant difference.Conclusions For patients whose heart rate is stable and ＜ 60 bpm,the double source CT image using electrocardiogram-triggered high-pitch spiral mode at 60％ R-R interval has high assessment grade and lower radiation dose.
