中华临床医师杂志(电子版)
中華臨床醫師雜誌(電子版)
중화림상의사잡지(전자판)
CHINESE JOURNAL OF CLINICIANS(ELECTRONIC VERSION)
2014年
12期
2219-2225
,共7页
黄海波%黄桂雄%林莹%管俊%曾嵩
黃海波%黃桂雄%林瑩%管俊%曾嵩
황해파%황계웅%림형%관준%증숭
冠状血管造影术%滤波反投影%低剂量%优化方案
冠狀血管造影術%濾波反投影%低劑量%優化方案
관상혈관조영술%려파반투영%저제량%우화방안
Coronary angiography%Filtered back projection%Low dose%Optimized program
目的:探讨滤波反投影(FBP)的冠状动脉CT血管成像(CCTA)低剂量优化方案。方法100例CCTA检查者编入A、B、C三组。A组采用回顾性心电门控、螺旋模式、120 kVp作为对照组;研究组B采用回顾性心电门控、螺旋模式、100 kVp同时适应增加管电流;研究组C使用前瞻性心电门控、轴扫模式。由两名经验丰富放射科医师双盲法操作完成,记录性别、年龄、BMI、心率(HR)、对比剂量(VOCA)、Z轴扫描长度(LZA)、CT容积剂量指数(CTDIvol)、剂量长度乘积(DLP)、有效辐射剂量(ED),测量和记录主动脉根部(ROA)CT值及噪声指数(IN)、图像主观质量评分(Score)、冠状动脉节段数(Seg.)及其分布,比较三组间上述变量差异。结果两医师评分一致性较好,Kappa值为0.62;三组间性别、年龄、BMI、HR、VOCA、LZA、Score差异无统计学意义(P>0.05),可诊断冠状动脉节段数98.97%(1149/1161),三组间各分值冠状动脉节段分布无统计学差异(P>0.05);三组间 ROA、IN 差异有统计学意义,多重比较显示除A与C组间ROA、A与B组间IN无统计学差异(P>0.05)外均有统计学意义(P<0.05);三组间CTDIvol、DLP、ED差异有统计学意义(P<0.05),多重比较显示CTDIvol、DLP、ED差异在各组之间均有统计学意义(P=0.000),与A组比较,B组CTDIvol、DLP、ED分别减少25.3%、30.1%、30.1%,C组CTDIvol、DLP、ED减少56.1%、70.2%、70.2%;与B组比较, C组CTDIvol、DLP、ED分别减少41.2%、57.3%、57.3%。结论采用FBP的256 iCT冠状动脉优化方案减少了辐射剂量,后门控在降低管电压并适当增加曝光量时可使ED减少约30.1%,前门控扫描较常规后门控减少ED约70.2%。
目的:探討濾波反投影(FBP)的冠狀動脈CT血管成像(CCTA)低劑量優化方案。方法100例CCTA檢查者編入A、B、C三組。A組採用迴顧性心電門控、螺鏇模式、120 kVp作為對照組;研究組B採用迴顧性心電門控、螺鏇模式、100 kVp同時適應增加管電流;研究組C使用前瞻性心電門控、軸掃模式。由兩名經驗豐富放射科醫師雙盲法操作完成,記錄性彆、年齡、BMI、心率(HR)、對比劑量(VOCA)、Z軸掃描長度(LZA)、CT容積劑量指數(CTDIvol)、劑量長度乘積(DLP)、有效輻射劑量(ED),測量和記錄主動脈根部(ROA)CT值及譟聲指數(IN)、圖像主觀質量評分(Score)、冠狀動脈節段數(Seg.)及其分佈,比較三組間上述變量差異。結果兩醫師評分一緻性較好,Kappa值為0.62;三組間性彆、年齡、BMI、HR、VOCA、LZA、Score差異無統計學意義(P>0.05),可診斷冠狀動脈節段數98.97%(1149/1161),三組間各分值冠狀動脈節段分佈無統計學差異(P>0.05);三組間 ROA、IN 差異有統計學意義,多重比較顯示除A與C組間ROA、A與B組間IN無統計學差異(P>0.05)外均有統計學意義(P<0.05);三組間CTDIvol、DLP、ED差異有統計學意義(P<0.05),多重比較顯示CTDIvol、DLP、ED差異在各組之間均有統計學意義(P=0.000),與A組比較,B組CTDIvol、DLP、ED分彆減少25.3%、30.1%、30.1%,C組CTDIvol、DLP、ED減少56.1%、70.2%、70.2%;與B組比較, C組CTDIvol、DLP、ED分彆減少41.2%、57.3%、57.3%。結論採用FBP的256 iCT冠狀動脈優化方案減少瞭輻射劑量,後門控在降低管電壓併適噹增加曝光量時可使ED減少約30.1%,前門控掃描較常規後門控減少ED約70.2%。
목적:탐토려파반투영(FBP)적관상동맥CT혈관성상(CCTA)저제량우화방안。방법100례CCTA검사자편입A、B、C삼조。A조채용회고성심전문공、라선모식、120 kVp작위대조조;연구조B채용회고성심전문공、라선모식、100 kVp동시괄응증가관전류;연구조C사용전첨성심전문공、축소모식。유량명경험봉부방사과의사쌍맹법조작완성,기록성별、년령、BMI、심솔(HR)、대비제량(VOCA)、Z축소묘장도(LZA)、CT용적제량지수(CTDIvol)、제량장도승적(DLP)、유효복사제량(ED),측량화기록주동맥근부(ROA)CT치급조성지수(IN)、도상주관질량평분(Score)、관상동맥절단수(Seg.)급기분포,비교삼조간상술변량차이。결과량의사평분일치성교호,Kappa치위0.62;삼조간성별、년령、BMI、HR、VOCA、LZA、Score차이무통계학의의(P>0.05),가진단관상동맥절단수98.97%(1149/1161),삼조간각분치관상동맥절단분포무통계학차이(P>0.05);삼조간 ROA、IN 차이유통계학의의,다중비교현시제A여C조간ROA、A여B조간IN무통계학차이(P>0.05)외균유통계학의의(P<0.05);삼조간CTDIvol、DLP、ED차이유통계학의의(P<0.05),다중비교현시CTDIvol、DLP、ED차이재각조지간균유통계학의의(P=0.000),여A조비교,B조CTDIvol、DLP、ED분별감소25.3%、30.1%、30.1%,C조CTDIvol、DLP、ED감소56.1%、70.2%、70.2%;여B조비교, C조CTDIvol、DLP、ED분별감소41.2%、57.3%、57.3%。결론채용FBP적256 iCT관상동맥우화방안감소료복사제량,후문공재강저관전압병괄당증가폭광량시가사ED감소약30.1%,전문공소묘교상규후문공감소ED약70.2%。
ObjectiveTo explore the optimized program of low-doseCCTA with filtered back projection(FBP). Methods 100 cases on 256-slices CCTA were recruited and splited into the control group A, studying Group B and C randomly. Scanning condition were as follows: Group A 120 Kv, automatic smart mA(about 800 mA), using retrospective ECG-gating with HELIX; Group B 100 Kv, automatic smart mA(about 900-1 200 mA), using retrospective ECG-gating with HELIX; Group C 120 Kvp, automatic smart mA(about 225-285 mA), using prospective ECG-gating with Axis scanning. Two radiologists completed all procedures in blind manner. Record patient's Sex, Age, BMI, HR, VOCA, LZA, CTDIvol, DLP, ED, ROA, IN, Score, Seg. and its distribution, then compared their difference of variables above among three groups. ResultsSubjective score consistency was achieved(Kappa value, 0.62). There was no statistical significance in Sex, Age, BMI, VOCA, LZA, score, seg. and its distribution amongst the groups (P>0.05), the percentage of diagnostic segments was 98.97% (1 149/1 161). There was statistical significance in ROA, IN, CTDIvol, DLP, ED among the groups (P<0.05). Compared with Group A, CTDIvol, DLP, ED from Group B decreased by 25.3% 30.1% 30.1% respectively, CTDIvol DLP ED from Group C decreased by 56.1% 70.2% 70.2% respectively; Compared with group B, CTDIvol DLP ED from Group C decreased by 41.2% 57.3% 57.3% respectively.Conclusions CCTA based on FBP could reduced radiation dose by optimized program on 256iCT. ED could be reduced by 70.2% using prospective ECG-gated technique compared with retrospective ECG-gated one. ED could be reduced by 30.1% while lower voltage and increase exposure using retrospective ECG-gated. Therefore, there was a certain value of clinical before a new reconstructive software was fixed in equipment.