中国医学影像技术
中國醫學影像技術
중국의학영상기술
CHINESE JOURNAL OF MEDICAL IMAGING TECHNOLOGY
2010年
3期
492-495
,共4页
马延贺%于铁链%李东%李锋坦
馬延賀%于鐵鏈%李東%李鋒坦
마연하%우철련%리동%리봉탄
体层摄影术,X线计算机%冠状血管造影术%辐射剂量%心电门控成像技术
體層攝影術,X線計算機%冠狀血管造影術%輻射劑量%心電門控成像技術
체층섭영술,X선계산궤%관상혈관조영술%복사제량%심전문공성상기술
Tomography,X-ray computed%Coronary angiography%Radiation dosage%Cardiac-gated imaging techniques
目的 比较64层螺旋CT冠状动脉造影(CTCA)前瞻性心电门控与回顾性心电门控扫描的辐射剂量及图像质量.方法 连续选取60例疑似冠状动脉疾病患者,并随机分为两组:研究组30例[平均体重指数(25.30±3.15)kg/m2,心率≤65次/分]行前瞻性心电门控扫描,根据患者体重选择管电流(400 mA/500 mA);对照组30例[平均体重指数(25.40±3.00)kg/m2,心率≤65次/分]行回顾性心电门控扫描,管电流650 mA.分别计算两组的平均有效剂量(ED),以12 cm作为标准扫描长度计算标准化辐射剂量(ED_(标准)),并进行统计学分析.同时对两组患者冠状动脉段的显示质量进行评估.结果 两组平均ED分别为(5.97±1.04)mSv和(26.25±2.36)mSv,经标准化后,ED_(标准)分别为(5.49±0.45)mSv和(23.77±1.64)mSv.两组平均ED及ED_(标准)的差异均具有统计学意义(P均＜0.001),研究组ED_(标准)较对照组减少76.62%.两组图像质量的差异无统计学意义(χ~2=4.26,P=0.235).结论 前瞻性心电门控较回顾性心电门控技术能够在保证图像质量的同时明显减少辐射剂量.
目的 比較64層螺鏇CT冠狀動脈造影(CTCA)前瞻性心電門控與迴顧性心電門控掃描的輻射劑量及圖像質量.方法 連續選取60例疑似冠狀動脈疾病患者,併隨機分為兩組:研究組30例[平均體重指數(25.30±3.15)kg/m2,心率≤65次/分]行前瞻性心電門控掃描,根據患者體重選擇管電流(400 mA/500 mA);對照組30例[平均體重指數(25.40±3.00)kg/m2,心率≤65次/分]行迴顧性心電門控掃描,管電流650 mA.分彆計算兩組的平均有效劑量(ED),以12 cm作為標準掃描長度計算標準化輻射劑量(ED_(標準)),併進行統計學分析.同時對兩組患者冠狀動脈段的顯示質量進行評估.結果 兩組平均ED分彆為(5.97±1.04)mSv和(26.25±2.36)mSv,經標準化後,ED_(標準)分彆為(5.49±0.45)mSv和(23.77±1.64)mSv.兩組平均ED及ED_(標準)的差異均具有統計學意義(P均＜0.001),研究組ED_(標準)較對照組減少76.62%.兩組圖像質量的差異無統計學意義(χ~2=4.26,P=0.235).結論 前瞻性心電門控較迴顧性心電門控技術能夠在保證圖像質量的同時明顯減少輻射劑量.
목적 비교64층라선CT관상동맥조영(CTCA)전첨성심전문공여회고성심전문공소묘적복사제량급도상질량.방법 련속선취60례의사관상동맥질병환자,병수궤분위량조:연구조30례[평균체중지수(25.30±3.15)kg/m2,심솔≤65차/분]행전첨성심전문공소묘,근거환자체중선택관전류(400 mA/500 mA);대조조30례[평균체중지수(25.40±3.00)kg/m2,심솔≤65차/분]행회고성심전문공소묘,관전류650 mA.분별계산량조적평균유효제량(ED),이12 cm작위표준소묘장도계산표준화복사제량(ED_(표준)),병진행통계학분석.동시대량조환자관상동맥단적현시질량진행평고.결과 량조평균ED분별위(5.97±1.04)mSv화(26.25±2.36)mSv,경표준화후,ED_(표준)분별위(5.49±0.45)mSv화(23.77±1.64)mSv.량조평균ED급ED_(표준)적차이균구유통계학의의(P균＜0.001),연구조ED_(표준)교대조조감소76.62%.량조도상질량적차이무통계학의의(χ~2=4.26,P=0.235).결론 전첨성심전문공교회고성심전문공기술능구재보증도상질량적동시명현감소복사제량.
Objective To compare radiation dose and image quality between prospective and retrospective ECG gating CT coronary angiography (CTCA) with 64-slice CT scanner. Methods Sixty patients with suspected coronary artery disease were selected, and randomly devided into two groups. Thirty patients in research group (average body-mass index [BMI]:[25.30±3.15] kg/m~2, heart rate ≤65 beats per minute [bpm]) underwent CTCA using prospective ECG-gating (120 kV, mA tailored to weight), while the rest 30 patients in control group (average BMI:[25.40±3.00] kg/m~2, heart rate ≤65 bpm) underwent CTCA using retrospective ECG-gating (120 kV, 650 mA). The average effective dose (ED) and standardizing radiation dose (ED_(Sd)) which was standardized by 12 cm length were respectively calculated, and statistical analysis was then conducted, meanwhile image quality was evaluated. Results The average ED of research group and control group was (5.97±1.04) mSv and (26.25±2.36) mSv, respectively (t_(A,B)=43.13, P<0.05). The ED_(Sd) of two groups was (5.49±0.45) mSv and (23.77±1.64) mSv (t_(Sd)=59.00, P<0.05). ED_(Sd) decreased by 76.62% in research group compared with that of control group. No significant difference of image quality was found between two groups (χ~2=4.26, P=0.235). Conclusion Prospective ECG-gating CTCA can effectively reduce radiation dose without compromising image quality.
