CAJ | 학술논문

目的评价64层螺旋CT(MSCT)应用前瞻性心电门控横断面扫描技术低剂量冠状动脉成像的能力及图像质量.方法连续选取77例临床拟行冠状动脉成像的患者(A组,平均体重指数24.6,心率＜70次/min)行前瞻性门控横断面扫描,根据患者体重指数选择管电流(230～740 mA),管电压120 kV;用同样扫描条件模拟固定参数螺旋扫描剂量并记录.同时比较行MSCT冠状动脉成像连续回顾性门控心电标记固定参数的30例患者(B组,平均体重指数23.9,心率＜70次/min)的扫描剂量,并对2组的图像质量进行评价(配对t检验,P＜0.05为差异有统计学意义).结果 A组前门控横断面扫描冠状动脉成像剂最平均为3.37 mSv,所获图像满足临床诊断需要,模拟固定参数螺旋扫描平均剂量为17.29 mSv;B组实际回顾性门控CT固定参数螺旋扫描冠状动脉成像平均剂量为18.13 mSv.B组与A组模拟固定参数螺旋扫描剂量差异无统计学意义(t=0.87,P＞0.05),与A组前瞻性门控横断面扫描有效剂量比较差异有统计学意义(t=18.50,P＜0.01),减少了约81.4%.结论 64层MSCT冠状动脉成像中前瞻性心电门控横断面扫描技术能够获得满足临床诊断需要的高质最图像,同时非常有效地降低了辐射剂量.
목적 평개64층라선CT(MSCT)응용전첨성심전문공횡단면소묘기술저제량관상동맥성상적능력급도상질량.방법 련속선취77례림상의행관상동맥성상적환자(A조,평균체중지수24.6,심솔＜70차/min)행전첨성문공횡단면소묘,근거환자체중지수선택관전류(230～740 mA),관전압120 kV;용동양소묘조건모의고정삼수라선소묘제량병기록.동시비교행MSCT관상동맥성상련속회고성문공심전표기고정삼수적30례환자(B조,평균체중지수23.9,심솔＜70차/min)적소묘제량,병대2조적도상질량진행평개(배대t검험,P＜0.05위차이유통계학의의).결과 A조전문공횡단면소묘관상동맥성상제최평균위3.37 mSv,소획도상만족림상진단수요,모의고정삼수라선소묘평균제량위17.29 mSv;B조실제회고성문공CT고정삼수라선소묘관상동맥성상평균제량위18.13 mSv.B조여A조모의고정삼수라선소묘제량차이무통계학의의(t=0.87,P＞0.05),여A조전첨성문공횡단면소묘유효제량비교차이유통계학의의(t=18.50,P＜0.01),감소료약81.4%.결론 64층MSCT관상동맥성상중전첨성심전문공횡단면소묘기술능구획득만족림상진단수요적고질최도상,동시비상유효지강저료복사제량.
Objective To compare radiation dose and image quality between prospective electrocardiograph(ECG)-triggered axial seau and retrospective ECG-gated helical scan in coronary 64-slice CT angiography(CTA).Methods Seventy-seven consecutive patients[group A.Average body mass index (BMI):24.6,heart rate＜70 bpm]underwent 64-slice CTA using prospective ECG-triggered axial scan protocol(120 kV,mA tailored to BMI).For each patient,the simulated radiation dose using retrospective ECG-gated scan protocol without ECG-driven X-ray current modulation technology was calculated and recorded at sanle kV and mA.Retrospective ECG-gated scan protocol was performed on 30 consecutive patients in another group(group B.Average BMI:23.9,heart rate＜70 bpm).The image quality was blindly evaluated between group A and B(paired t-test was used and P＜0.05 as a significant difference).Results There Was a significant difference(t=18.50,P＜0.01)between radiation dose of group A (3.37 mSv)and that of group B(18.13 mSv),decreased by 81.4%.The image quality of group A could fulfill clinical diagnostic needs.The average radiation dose of using simulated helical scan without optimization was 17.29 mSv,which wag similar to that of group B(18.13 mSv)(t=0.87,P＞0.05).Condusion Prospective ECG-triggered axial scan in 64-slice coronary CTA Call significantly reduce radiation exposure and the image quality can fulfill clinical diagnostic needs.