第三代双源CT冠状动脉成像三低扫描方案的初步经验

发布时间：2018-03-14 11:44

本文选题：体层摄影术　切入点：X线计算机　出处：《放射学实践》2017年04期 　论文类型：期刊论文

【摘要】：目的:探究第三代双源CT(DSCT)前瞻性心电门控大螺距CT冠状动脉成像(CTCA)扫描模式下,应用70kv低管电压联合20mL低对比剂用量和3.0mL/s低注射流率的三低方案的可行性。方法:应用第三代双源CT对100例体质量指数(BMI)≤30kg/m~2、心率(HR)≤75次/分的患者行前瞻性心电门控大螺距CTCA检查。所有患者随机分为两组,采用2种扫描方案:A组48例,管电压80kVp,对比剂总量及流率分别为40mL和4.0mL/s;B组52例,管电压70kVp,对比剂总量及流率分别为20mL和3.0mL/s。测量动脉腔内CT值、图像噪声、信噪比(SNR)和对比噪声比(CNR)等客观指标以及Likert 4级主观评分法比较两组的图像质量,记录并比较两组的辐射剂量。结果:B组的图像噪声显著高于A组,但动脉(主动脉、左冠脉主干和前降支、右冠状动脉)腔内CT值均显著高于A组(P0.05)。两组间SNR和CNR的差异无统计学意义(P0.05),两组间图像质量评分的差异无统计学意义(P0.05)。与A组相比,B组的有效辐射剂量减少了40%。结论:使用第三代DSCT结合三低扫描方案行前瞻性心电门控大螺距冠状动脉成像,可获得较为满意的图像质量,且辐射剂量、对比剂用量和流率均较常规扫描方案显著降低。
[Abstract]:Objective: To explore the third generation dual source CT (DSCT) prospective ECG gated high pitch CT coronary artery imaging (CTCA) scan mode, three low feasibility scheme of applying 70kv low tube voltage and 20mL low contrast agent dosage and low injection rate of 3.0mL/s. Methods: the application of the third generation dual source CT in 100 cases of body mass index (BMI = 30kg/m~2), heart rate (HR) than patients underwent prospective ECG gated high pitch CTCA 75 bpm. All patients were randomly divided into two groups, with 2 scan program: A group of 48 cases, the total flow rate and tube voltage 80kVp, contrast agent were 40mL and 4.0mL/s; 52 cases in group B, tube the total voltage is 70kVp, and flow rate of contrast agent were 20mL and 3.0mL/s. to measure the arterial cavity CT value, image noise, signal-to-noise ratio (SNR) and contrast to noise ratio (CNR) image quality compared with two groups of objective indicators and Likert 4 level subjective scoring method, record and compare the radiation dose in the two groups. Results Image noise of B group was significantly higher than that in group A, but the arteries (aorta, left main coronary artery and the anterior descending branch of the right coronary artery) cavity CT values were significantly higher than A group (P0.05). There was no significant difference between the two groups SNR and CNR (P0.05), there was no significant difference between the two groups of image quality score (P0.05). Compared with the A group, effective radiation dose B group reduced 40%. conclusion: using the third generation DSCT with three low scanning scheme for prospective ECG gated high pitch coronary artery imaging, image quality can be obtained satisfactory, and radiation dose, contrast agent dosage and flow rate were compared with the conventional scanning program decreased significantly.

【作者单位】：天津医科大学总医院放射科;
【基金】：天津市应用基础与前沿技术研究计划重点项目(14JCZDJC57000) 国家自然科学基金青年科学基金资助项目(81301217)
【分类号】：R541.4;R816.2

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