实用放射学杂志
實用放射學雜誌
실용방사학잡지
JOURNAL OF PRACTICAL RADIOLOGY
2015年
8期
1354-1357
,共4页
赵磊%包丽丽%王泽锋%刘挨师
趙磊%包麗麗%王澤鋒%劉挨師
조뢰%포려려%왕택봉%류애사
计算机体层成像%肺动脉%图像质量%辐射剂量
計算機體層成像%肺動脈%圖像質量%輻射劑量
계산궤체층성상%폐동맥%도상질량%복사제량
computed tomography%pulmonary artery%image quality%radiation dose
目的：评价 CTPA 低管电压下通过循环测试峰值调制管电流的图像质量。方法连续选取满足纳入标准与排除标准的可疑肺动脉栓塞患者30例。采用64层螺旋 CT 系统,管电压设置为80 kV,管电流根据循环时间测试感兴趣区衰减值进行设置。注射流率为4 mL/s,对比剂剂量为28 mL、盐水冲洗剂量为40 mL。由2位观察者在不知道扫描参数的情况下对肺动脉干层面管腔衰减值、噪声值、信噪比(SNR)与对比噪声比(CNR)进行测量,并以4分制(4分优,1分差)进行评价。对影响因素与图像质量进行相关性分析。P<0.05认为差异具有统计学意义。结果 Pearson 相关分析显示循环时间测试峰值与衰减值呈正相关(r=0.398, P=0.029),循环时间测试峰值与噪声值相关无统计学意义(r=0.104,P=0.583),循环时间测试峰值与 SNR 呈正相关(r=0.263,P =0.160),循环时间测试峰值与 CNR 呈正相关(r=0.299,P =0.109)。体质量、体质量指数、体表面积与图像质量相关均无统计学意义。肺动脉干衰减值为(628.63±146.46)HU,噪声值为(53.92±14.07)HU,SNR 为12.02±3.17,CNR 为10.81±3.10,可评估率为95.82%。结论低管电压下基于循环测试峰值进行管电流调制可以保持图像质量,并提高稳定性。
目的：評價 CTPA 低管電壓下通過循環測試峰值調製管電流的圖像質量。方法連續選取滿足納入標準與排除標準的可疑肺動脈栓塞患者30例。採用64層螺鏇 CT 繫統,管電壓設置為80 kV,管電流根據循環時間測試感興趣區衰減值進行設置。註射流率為4 mL/s,對比劑劑量為28 mL、鹽水遲洗劑量為40 mL。由2位觀察者在不知道掃描參數的情況下對肺動脈榦層麵管腔衰減值、譟聲值、信譟比(SNR)與對比譟聲比(CNR)進行測量,併以4分製(4分優,1分差)進行評價。對影響因素與圖像質量進行相關性分析。P<0.05認為差異具有統計學意義。結果 Pearson 相關分析顯示循環時間測試峰值與衰減值呈正相關(r=0.398, P=0.029),循環時間測試峰值與譟聲值相關無統計學意義(r=0.104,P=0.583),循環時間測試峰值與 SNR 呈正相關(r=0.263,P =0.160),循環時間測試峰值與 CNR 呈正相關(r=0.299,P =0.109)。體質量、體質量指數、體錶麵積與圖像質量相關均無統計學意義。肺動脈榦衰減值為(628.63±146.46)HU,譟聲值為(53.92±14.07)HU,SNR 為12.02±3.17,CNR 為10.81±3.10,可評估率為95.82%。結論低管電壓下基于循環測試峰值進行管電流調製可以保持圖像質量,併提高穩定性。
목적：평개 CTPA 저관전압하통과순배측시봉치조제관전류적도상질량。방법련속선취만족납입표준여배제표준적가의폐동맥전새환자30례。채용64층라선 CT 계통,관전압설치위80 kV,관전류근거순배시간측시감흥취구쇠감치진행설치。주사류솔위4 mL/s,대비제제량위28 mL、염수충세제량위40 mL。유2위관찰자재불지도소묘삼수적정황하대폐동맥간층면관강쇠감치、조성치、신조비(SNR)여대비조성비(CNR)진행측량,병이4분제(4분우,1분차)진행평개。대영향인소여도상질량진행상관성분석。P<0.05인위차이구유통계학의의。결과 Pearson 상관분석현시순배시간측시봉치여쇠감치정정상관(r=0.398, P=0.029),순배시간측시봉치여조성치상관무통계학의의(r=0.104,P=0.583),순배시간측시봉치여 SNR 정정상관(r=0.263,P =0.160),순배시간측시봉치여 CNR 정정상관(r=0.299,P =0.109)。체질량、체질량지수、체표면적여도상질량상관균무통계학의의。폐동맥간쇠감치위(628.63±146.46)HU,조성치위(53.92±14.07)HU,SNR 위12.02±3.17,CNR 위10.81±3.10,가평고솔위95.82%。결론저관전압하기우순배측시봉치진행관전류조제가이보지도상질량,병제고은정성。
Objective To evaluate the image quality and obtained by the tube current modulation base on time bolus peak in low voltage in CTPA.Methods 30 consecutive patients suspected pulmonary embolism(PE)were prospectively enrolled,and satisfy the following conditions.The study was performed by 64-slice spiral CT system (lightspeed VCT-XT,GE healthcare),Tube voltage was set at 80 kV.Tube current settings related to the attenuation of ROIs by test bolus peak.The injection parameters were set up by injection flow rate (4 mL/s),contrast medium dose (28 mL),and saline flushing dose (40 mL).All images were evaluated by two observers blinded to pulmonary CTA protocol,including attenuation,noise,SNR and CNR.The image quality was evaluate by 4-score.To evaluate the relationship between influential factor and image quality using Pearson correlation analysis.A P-value <0.05 was considered to indicate a statistically significant difference.Results The time bolus peak was statistically significant influence on attenuation(r=0.398,P =0.029).There was no statistically significant influence on noise (r=0.104,P =0.583),signal-to-noise ra-tio (r=0.263,P =0.1 60)and contrast-to-noise ratio(r=0.299,P =0.109).The other factors(BM,BMI and BSA)was no statisti-cally significant influence on the image quality(P > 0.05 ).The mean attenuation,noise,SNR and CNR on pulmonary trunk was (628.63±146.46)HU,(53.92±14.07)HU,12.02±3.1 7 and 10.81±3.10,respectively.The percentage of assessable pulmonary arteries was 95.82%.Conclusion The tube current modulation base on time bolus peak in low voltage could offer assessable image quality and raise image stability.
