第3代双源CT在大螺距主动脉CT血管成像扫描中的初步应用

发布时间：2018-07-10 16:52

本文选题：主动脉 + CT血管成像　；参考：《中国医学科学院学报》2017年01期

【摘要】：目的评价第3代双源CT在大螺距主动脉CT血管成像(CTA)扫描中的应用价值。方法采用简单随机分组方法将59例临床行全主动脉CTA扫描的患者随机分为两组:(1)组1(n=28):在第3代双源CT上进行扫描,探测器宽度为2×192×0.6 mm,旋转时间为0.25 s。(2)组2(n=31):在第2代双源CT上进行扫描,探测器准直为2×128×0.6 mm,旋转时间为0.28 s。两组患者均采用大螺距心电门控扫描方式进行扫描,螺距3.0,管电压100 kV,管电流采用自动调节技术,参考管电流为288 m A。患者均静脉团注370 mg I/ml的对比剂45 ml,注射速度4.5 ml/s,后续50 ml生理盐水,注射速度5.0 ml/s。扫描采用自动团注跟踪触发技术,选取主动脉起始部放置感兴趣区(ROI),ROI内平均CT值达到100 HU时自动触发扫描,延迟时间6 s。分别计算两组患者主动脉扫描的有效剂量(ED)、图像信噪比(SNR)、对比噪声比(CNR),并对图像质量进行主观评价。结果组1扫描ED为(3.15±0.86)m Sv,较组2的(3.91±0.60)m Sv降低了19.44%(t=-3.989,P=0.000)。两组主动脉各部位的SNR及CNR差异均无统计学意义(P均0.05)。两组图像主观质量评分差异也无统计学意义[(1.39±0.50)分比(1.45±0.51)分;W=814.5,P=0.651]。结论与第2代双源CT相比,第3代双源CT进行大螺距主动脉CTA扫描能够在保证图像质量的同时,显著降低放射剂量。
[Abstract]:Objective to evaluate the value of the third generation dual CT in large pitch aortic CT angiography (CTA). Methods A total of 59 patients undergoing CTA were randomly divided into two groups: (1) Group 1 (n = 28): the third generation dual CT scan was performed. The width of the detector is 2 脳 192 脳 0.6 mm, and the rotation time is 0.25 s. (2) Group 2 (NC31): scanning on the second generation dual-source CT, the detector collimation is 2 脳 128 脳 0.6 mm and the rotation time is 0.28 s. The patients in both groups were scanned by large pitch ECG gated scan. The pitch was 3.0, the voltage of the tube was 100 kV, and the current of the tube was automatically adjusted. The reference current of the tube was 288 Ma. All patients were injected with 370 mg I / ml contrast agent of 45 ml, injection rate of 4.5 ml / s, followed by 50 ml of normal saline, injection rate of 5.0 ml / s. The technique of automatic cluster injection tracking trigger was used. When the average CT value of ROI in ROI was 100 Hu, the delay time was 6 s. The effective dose (Ed), image signal-to-noise ratio (SNR), contrast noise ratio (CNR) and image quality were calculated. Results Ed in group 1 was (3.15 卤0.86) m Sv, which was 19.44% lower than that in group 2 (3.91 卤0.60) m Sv. There was no significant difference in SNR and CNR between the two groups (P 0.05). There was no significant difference in subjective quality score between the two groups [(1.39 卤0.50) score / (1.45 卤0.51) score]. Conclusion compared with the second generation dual-source CT, the third generation dual-source CT scan with large pitch aortic CTA can significantly reduce the radiation dose while ensuring the image quality.
【作者单位】：中国医学科学院北京协和医学院北京协和医院放射科;
【基金】：国家临床重点专科建设项目(2014) 卫生公益性行业科研专项项目(201402001、201402019)~~
【分类号】：R816.2;R543.1

【相似文献】