低体质量指数患者双源CT低管电压冠状动脉成像的应用研究  被引量:19

Study of dual-source CT coronary angiography using low tube voltage setting in patients with low body mass index

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作  者:曹建新[1] 王鹏[1] 王一民[1] 杨诚[1] 王帅[1] 

机构地区:[1]解放军第一六一医院放射科,武汉,430010

出  处:《中华放射学杂志》2013年第5期452-457,共6页Chinese Journal of Radiology

摘  要:目的探讨80kV管电压双源CT冠状动脉成像(CTCA)在低体质量指数(BMI)患者中应用的可行性。方法240例疑有冠状动脉疾病且BMI在18.6~21.5kg/m。的患者按数字表法随机分成A、B、C组行双源CTCA检查,分别采用120、100和80kV管电压。对每位患者的对比剂用量、CT容积剂量指数(CTDIvol)、剂量长度乘积(DLP)、有效辐射剂量(ED)、图像噪声、冠状动脉CT值、对比度、信噪比(SNR)、对比噪声比(CNR)和图像优良指数(FOM)进行评估。同时按3分法对冠状动脉图像质量进行评分(3分为优秀,2分为一般,1分为差)。扫描长度、CTDIvol、DLP、ED、对比剂用量、图像噪声、冠状动脉CT值、对比度、SNR、CNR及FOM在3组问比较均采用单因素方差分析,采集时间窗使用情况比较采用X^2检验,图像质量评分比较采用Kruskal-Wallis检验。结果3组间扫描长度及采集时间窗使用情况差异均无统计学意义(扫描长度F=2.58,采集时间窗)X^2=0.77,P均〉0.05)。A、B和C组对比剂用量(碘海醇350mg1/m1)平均值分别为(82.0±6,4)、(76.8±6.1)和(59.1±3.5)ml,相应的CTDIvol平均值分别为(27.5±6.2)、(18.7±4.4)和(11.4±2.4)mGy,DLP平均值分别为(427.7±92.4)、(295.4±77.1)和(183.9±41.3)mGy·cm,ED平均值分别为(6.1±1.3)、(4.1±1.1)和(2.6±0.6)mSv,3组间对比剂用量、CTDIvol、DLP和ED差异均有统计学意义(对比剂用量、CTDIvol、DLP和ED对应的F值分别为383.08、248.13、221.05和234.81,P值均〈0.01),与A和B组相比,C组对比剂用量分别下降27.9%和23.0%,ED分别下降57.4%和36.6%。A、B和C组图像噪声平均值分别为(22.6±2.2)、(26.1±3.0)和(29.1±3.4)HU,差异有统计学意义(F=101.32,P〈0.01)。A组右冠状动脉(RCA)近段的CT值、对�Objective To explore the feasibility of dual-source CT coronary angiography (CTCA) using 80 kV tube voltage setting in patients with low body mass index (BMI). Methods A total of 240 patients with suspected coronary artery disease ( BMI range 18.6-21.5 kg/m^2 ) underwent dual-source CTCA. They were randomly assigned to group A (120 kV tube voltage), B (100 kV tube voltage) and C (80 kV tube voltage) based on a randonl number table. The contrast media dose, volume CT dose index (CTDIvol) ,dose length product (DLP), and effective dose (ED) were evaluated for each patient. Image noise,CT value, contrast, signal-to-noise ratio ( SNR), contrast-to-noise ratio (CNR) and figure of merit (FOM) of coronary artery were all evaluated. The image quality of coronary artery was assessed with a threepoint scale (3 points: excellent, 2 points: general, 1 point : poor). Scan length, CTDIvol, DLP, ED, and contrast media dose for patients,image noise, CT value, contrast, SNR, CNR, and FOM of coronary artery were all analyzed using one-way ANOVA analysis for 3 groups. Time windows of ECG-pulsing protocol were analyzed using X^2 test, and the image quality scores of coronary artery were analyzed using Kruskal- WaUis test. Results There were no differences in scan length and Time windows of ECG-pulsing protocol among 3 groups ( scan length F = 2.58, P 〉 0. 05, Time windows of ECG-pulsing protocol X^2 = 0. 77,P 〉 0. 05 ). The average contrast media doses were ( 82. 0 ± 6. 4 ), ( 76. 8 ± 6. 1 ), and ( 59. 1 ± 3.5 ) ml, the average CTDIvol were( 27.5 ±6.2),(18.7 ±4.4),and(11.4 ±2.4)mGy,the average DLPs were (427.7 ±92.4), (295.4±77. 1 ),and (183.9 ±41.3 )mGy · cm,and the average EDs were(6. 1 ± 1.3 ), (4. 1 ± 1.1 ), and (2.6 ± 0. 6)rosy for group A, B and C, respectively. There were statistical differences in contrast media dose, CTDIvoI,DLP,and ED among 3 groups ( the F values for contrast media dose, CTDIv

关 键 词:冠状血管 体层摄影术 X线计算机 辐射剂量 对比剂 

分 类 号:R816.2[医药卫生—放射医学]

 

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