医学影像学杂志
醫學影像學雜誌
의학영상학잡지
Journal of Medical Imaging
2015年
9期
1579-1583
,共5页
刘世合%付青%杨青%柳澄%胡亚彬%于华龙%段峰%张传玉
劉世閤%付青%楊青%柳澄%鬍亞彬%于華龍%段峰%張傳玉
류세합%부청%양청%류징%호아빈%우화룡%단봉%장전옥
冠状动脉%血管造影术%体层摄影术 ,X线计算机%辐射剂量
冠狀動脈%血管造影術%體層攝影術 ,X線計算機%輻射劑量
관상동맥%혈관조영술%체층섭영술 ,X선계산궤%복사제량
Coronary artery%Angiography%Tomography,X-ray computed%Radiation dose
目的:探讨640层CT前瞻性心电门控扫描模式下低kV设置降低辐射剂量的效果。方法连续收集怀疑冠心病或查体患者400例,分为4组:①管电压120kV组200例,本组中再按心率≥65次采用30%~80%时相曝光(A组)和心率<65次采用70%~80%时相曝光(B组)两组;(2)管电压100kV组200例,本组中再按心率≥65次采用30%~80%时相曝光(A组)和心率<65次采用70%~80%时相曝光(B组)两组。对120kV组和100kV组CT 图像的客观指标、主观图像质量评价、CT容积剂量指数(CTDIvol)和有效吸收剂量(ED)进行比较,使用方差分析及post hoc检验对4组数据进行统计学分析。结果100kV A组较120kV A组平均CTDIvol和 ED分别下降25.9%(8.9/34.4)和26.6%(2.5/9.4),2组差异有统计学意义( q =1.135,P =0.000)( q =1.472,P =0.000);100kV B组较120kV B组平均CT‐DIvol和ED分别下降21.4%(2.4/11.2)和22.6%(0.7/3.1),2组差异有统计学意义( q =0.522,P =0.012)( q =0.613,P =0.001)。采用相同的kV设置不同的曝光时相时,辐射剂量有明显差别,120kV B组较120kV A组平均CT‐DIvol和ED分别下降约64.5%(22.2/34.4)和67.0%(6.3/9.4),100kV B组较100kV A组平均CTDIvol和ED分别下降约65.4%(16.7/25.5)和65.2%(4.5/6.9),差别均有明显统计学意义( q =3.380, P =0.000)( q =4.455, P =0.000)( q =7.380,P =0.000)( q =4.652,P =0.000);100kV A组、B组的平均SNR、CNR和图像主观评分均低于120kV A、B组,但差异无统计学意义( P >0.05)。结论 DVCTA前瞻性心电门控扫描模式下应用低kV设置对于不同时间窗曝光患者均可进一步有效减低辐射剂量。
目的:探討640層CT前瞻性心電門控掃描模式下低kV設置降低輻射劑量的效果。方法連續收集懷疑冠心病或查體患者400例,分為4組:①管電壓120kV組200例,本組中再按心率≥65次採用30%~80%時相曝光(A組)和心率<65次採用70%~80%時相曝光(B組)兩組;(2)管電壓100kV組200例,本組中再按心率≥65次採用30%~80%時相曝光(A組)和心率<65次採用70%~80%時相曝光(B組)兩組。對120kV組和100kV組CT 圖像的客觀指標、主觀圖像質量評價、CT容積劑量指數(CTDIvol)和有效吸收劑量(ED)進行比較,使用方差分析及post hoc檢驗對4組數據進行統計學分析。結果100kV A組較120kV A組平均CTDIvol和 ED分彆下降25.9%(8.9/34.4)和26.6%(2.5/9.4),2組差異有統計學意義( q =1.135,P =0.000)( q =1.472,P =0.000);100kV B組較120kV B組平均CT‐DIvol和ED分彆下降21.4%(2.4/11.2)和22.6%(0.7/3.1),2組差異有統計學意義( q =0.522,P =0.012)( q =0.613,P =0.001)。採用相同的kV設置不同的曝光時相時,輻射劑量有明顯差彆,120kV B組較120kV A組平均CT‐DIvol和ED分彆下降約64.5%(22.2/34.4)和67.0%(6.3/9.4),100kV B組較100kV A組平均CTDIvol和ED分彆下降約65.4%(16.7/25.5)和65.2%(4.5/6.9),差彆均有明顯統計學意義( q =3.380, P =0.000)( q =4.455, P =0.000)( q =7.380,P =0.000)( q =4.652,P =0.000);100kV A組、B組的平均SNR、CNR和圖像主觀評分均低于120kV A、B組,但差異無統計學意義( P >0.05)。結論 DVCTA前瞻性心電門控掃描模式下應用低kV設置對于不同時間窗曝光患者均可進一步有效減低輻射劑量。
목적:탐토640층CT전첨성심전문공소묘모식하저kV설치강저복사제량적효과。방법련속수집부의관심병혹사체환자400례,분위4조:①관전압120kV조200례,본조중재안심솔≥65차채용30%~80%시상폭광(A조)화심솔<65차채용70%~80%시상폭광(B조)량조;(2)관전압100kV조200례,본조중재안심솔≥65차채용30%~80%시상폭광(A조)화심솔<65차채용70%~80%시상폭광(B조)량조。대120kV조화100kV조CT 도상적객관지표、주관도상질량평개、CT용적제량지수(CTDIvol)화유효흡수제량(ED)진행비교,사용방차분석급post hoc검험대4조수거진행통계학분석。결과100kV A조교120kV A조평균CTDIvol화 ED분별하강25.9%(8.9/34.4)화26.6%(2.5/9.4),2조차이유통계학의의( q =1.135,P =0.000)( q =1.472,P =0.000);100kV B조교120kV B조평균CT‐DIvol화ED분별하강21.4%(2.4/11.2)화22.6%(0.7/3.1),2조차이유통계학의의( q =0.522,P =0.012)( q =0.613,P =0.001)。채용상동적kV설치불동적폭광시상시,복사제량유명현차별,120kV B조교120kV A조평균CT‐DIvol화ED분별하강약64.5%(22.2/34.4)화67.0%(6.3/9.4),100kV B조교100kV A조평균CTDIvol화ED분별하강약65.4%(16.7/25.5)화65.2%(4.5/6.9),차별균유명현통계학의의( q =3.380, P =0.000)( q =4.455, P =0.000)( q =7.380,P =0.000)( q =4.652,P =0.000);100kV A조、B조적평균SNR、CNR화도상주관평분균저우120kV A、B조,단차이무통계학의의( P >0.05)。결론 DVCTA전첨성심전문공소묘모식하응용저kV설치대우불동시간창폭광환자균가진일보유효감저복사제량。
Objective To investigate the effect of low tube voltage on image quality and radiation dose at the 640 slice CT coronary CT angiography (CTA) with prospective electrocardiographic (ECG) gated scanning mode .Methods 400 pa‐tients requiring coronary CTA for clinical reasons were divided into 4 groups:① 200 cases in the 120 kV tube voltage group ,this group was assigned two groups :group A(112 cases) with HR≥65 bpm and exposuring in 30% ~80% R‐R interval;group B(88 cases) with HR<65 bpm and exposuring in 70% ~80% R‐R interval;② 200 cases in the 100 kV tube voltage group ,this group was assigned two groups:group A(109 eases) with HR≥65 bpm and exposuring in 30% ~80% R‐R interval .The objective and subjective indexes for assessing CT image quality ,CT dose index volume (CTDIvol) and effective received dose (ED) were compared between 120 kV group (A ,B) and 100 kV group (A ,B) ,The variance a‐nalysis and post hoc test were employed for the statistical analysis .Results Compared with 120 kV group (A ,B) ,the CTDIvol of 100 kV group (A ,B) decreased for 25 .9% (8 .9/34 .4) and 21 .4% (2 .4/11 .2) ,and the ED decreased for 26.6% (2 .5/9 .4) and 22 .6% (0 .7/3 .1) separately ,with a significant difference between 2 groups ( q =1 .135 ,P =0.000) ( q =0 .522 ,P =0 .012) ( q =1 .472 ,P =0 .000) ( q =0 .613 ,P =0 .001) but subjective index for the image quality demonstrated no differences ( P>0 .05) .Using the same set of kV but different exposure phase ,there are obvious differences between the radiation dose ,the CTDIvol and ED of 120 kV group B decreased for 64 .5% (22 .2/34.4) and 67% (6 .3/9 .4) compared with 120 kV group A ,the CTDIvol and ED of 100 kV group B decreased for 65 .4% (16 .7/25.5) and 65 .2% (4 .5/6 .9) ,compared with 100 kV group A ,with significant difference ( q =3 .380 ,P =0 .000)( q =4 .455 ,P =0 .000)( q =7 .380 ,P=0 .000)( q =4 .652 ,P=0 .000) .Conclusion Application of low kV settings for dif‐ferent time windowof exposure patients can further reduce the radiation dose conclusion DVCTA prospective ECG gated‐scanning mode .With prospective electrocardiographic (ECG) gated scanning mode ,Using low kV setting (100 kV) could reduce radiation dose furtherly for different time window of exposure patients in the 640 slice CT coronary CT angiography (CTA) .