CAJ | 학술논문

目的探讨宝石CT心脏冠脉检查中,以患者体重指数(BMI)为基础的低剂量扫描方案实施前后对图像质量及有效辐射剂量的影响.方法连续选取临床拟诊冠心病行CT冠状动脉造影(CTCA)患者207例为A组(实施低剂量扫描方案前—常规剂量组),242例为B组(实施低剂量扫描方案后—低剂量组),根据患者BMI依次选择管电压(kVp)和管电流(mA).分别对两组患者冠脉图像质量进行评分,比较两组图像的信噪比、容积CT剂量指数(CTDIvol)及有效辐射剂量(E),分析扫描变量与患者所接受有效辐射剂量之间的关系.结果 A组患者所接受有效辐射剂量为1.9(1.5,2.3)mSv,B组患者所接受有效辐射剂量为1.2(0.8,2.5) mSv(Z=-6.24,P＜0.05).多因素回归分析显示对有效辐射剂量影响最大的是扫描模式,其次是管电压、管电流、扫描长度.B组冠脉图像信噪比较A组略高(Z=-2.22,P＜0.05).A组与B组图像质量评分差异无统计学意义.结论低剂量扫描方案可有效降低患者所接受的辐射剂量,并且不影响冠脉图像质量.
목적 탐토보석CT심장관맥검사중,이환자체중지수(BMI)위기출적저제량소묘방안실시전후대도상질량급유효복사제량적영향.방법 련속선취림상의진관심병행CT관상동맥조영(CTCA)환자207례위A조(실시저제량소묘방안전—상규제량조),242례위B조(실시저제량소묘방안후—저제량조),근거환자BMI의차선택관전압(kVp)화관전류(mA).분별대량조환자관맥도상질량진행평분,비교량조도상적신조비、용적CT제량지수(CTDIvol)급유효복사제량(E),분석소묘변량여환자소접수유효복사제량지간적관계.결과 A조환자소접수유효복사제량위1.9(1.5,2.3)mSv,B조환자소접수유효복사제량위1.2(0.8,2.5) mSv(Z=-6.24,P＜0.05).다인소회귀분석현시대유효복사제량영향최대적시소묘모식,기차시관전압、관전류、소묘장도.B조관맥도상신조비교A조략고(Z=-2.22,P＜0.05).A조여B조도상질량평분차이무통계학의의.결론 저제량소묘방안가유효강저환자소접수적복사제량,병차불영향관맥도상질량.
Objective To evaluate effects on image quality and effective radiation with the dose reduction protocol adapted by body mass index (BMI) in coronary artery CT angiography with discovery 750 HD.Methods Two hundred and seven patients suspected with coronary artery disease (CAD) were enrolled in Group A who were underwent CT angiography with routine radiation,and another 242 patients were enrolled in Group B who received a new scanning protocol with tube voltage and tube current modulation depending on the BMI.The scores of image quality,signal noise ratio(SNR),CT dose index (CTDIvol),and effective dose (E) were compared and the correlation between the scanning parameters and E was analyzed.Results The mean radiation dose in Group B (1.2,ranging from 0.8 to 2.5 mSv) was significantly lower than that in Group A (1.9,ranging from 1.5 to 2.3 mSv ; Z =-6.24,P ＜ 0.05).The multivariate regression analysis revealed that the first factor affecting effective radiation dose ranked as scanning mode,tube voltage,tube current,and scan length,respectively.The image quality between two groups was not significantly different.The SNR in Group B was greater than that in Group A (Z =-2.22,P ＜0.05).Conclusions Dose reduction protocol in coronary artery CT angiography with discovery 750 HD would help to reduce the radiation dose effectively without sacrificing image quality.