Application of Dual-source Low-dose CT Flash Scanning in 3D Cardiac Imaging_West China Medical Journal

Authors：

 ZouMeng ,  LiZhenlin , PanXuelin , YuanYuan , QianLingling

Department of Radiology, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P. R. China;

Corresponding author：

LiZhenlin, Email: lzlcd01@126.com

Keywords：

Flash scanning; Low radiation dose; 3D heart

DOI：

10.7507/1002-0179.201600140

Video：

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Objective To discuss the value of dual-source CT Flash scanning in reducing the dose of radiation in 3D cardiac imaging. Method We collected 60 patients from March to August 2014 who should undergo cardiac 3D CT scanning before radiofrequency ablation. They were randomly divided into group A and B with 30 in each. Patients in group A underwent flash technology scanning, while those in group B accepted conventional retrospective electrocardiography-gated scanning. CARE Dose techniques were used to collect data. Scanning parameters were the same for both groups:collimation was 128×0.6 mm, reconstruction thickness was 0.75 mm, reconstruction interval was 0.7 mm, and field of view was 180-200 mm. After image acquisition, we measured the CT values and noise of left atrium and various branches of the pulmonary veins (upper left, lower left, upper right, and lower right). Statistical software was used for the two groups of images to analyze the carrier noise ratio (CNR), signal noise ratio (SNR), blinded scores, computed tomography dose index (CTDI_vol), and dose-length product (DLP) of the left atrium and pulmonary vein. Results CNR and SNR of the left atrium and various pulmonary veins between the two groups had no significant differences (P>0.05) . Blinded scores between the two groups were not significantly different (P>0.05) . CTDI_vol in group A and group B was respectively (2.92±0.38) and (20.15±12.09) mGy, with a significant difference (t=?7.803, P<0.001) . DLP of group A was (59.30±6.67) mGy·cm, significantly lower than that in group B [(334.43±216.71) mGy·cm] (t=?6.591, P<0.001) . Flash-efficient radiation dose was (0.83±0.94) mSv in group A, far below that in group B [(4.53±3.03) msv], and the difference was statistically significant (t=?6.684, P<0.001) . Conclusions Dual-source CT Flash technology applied in 3D cardiac scanning can reduce radiation dose as well as meet the needs of image diagnosis.

Citation： ZouMeng, LiZhenlin, PanXuelin, YuanYuan, QianLingling. Application of Dual-source Low-dose CT Flash Scanning in 3D Cardiac Imaging. West China Medical Journal, 2016, 31(3): 531-535. doi: 10.7507/1002-0179.201600140 Copy

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1. 殷敏敏, 余永强, 钱银峰, 等. 64层螺旋CT对肺静脉的形态定量分析[J]. 中国医学影像技术, 2007, 23(9) :1323-1326.
2. 晏子旭, 徐磊, 杨琳, 等. 320排容积CT低剂量左心房肺静脉成像[J]. 中国医学影像技术, 2010, 26(9) :1772-1774.
3. Nakayama Y, Awai K, Funama Y, et al. Lower tube voltage reduces contrast material and radiation doses on 16-MDCT aortography[J]. AJR Am J Roentgenol, 2006, 187(5) :W490-W497.
4. 郑敏文, 赵宏亮, 徐健, 等. 多层螺旋CT主动脉低剂量与常规剂量扫描的对照研究[J]. 中国医学影像技术, 2008, 24(3) :443-446.
5. 夏宾, 杨学华, 高剑波, 等. 新双源CT Flash扫描冠状动脉CT血管成像对冠状动脉狭窄的评估效果[J]. 郑州大学学报:医学版, 2012, 47(6) :833-836.
6. 王怡宁, 李烁, 孔令燕, 等. 低剂量双源CT前瞻性心电触发大螺距扫描冠状动脉造影的图像质量和放射剂量[J]. 中国医学科学院学报, 2010, 32(6) :597-600, 后插1-后插2.
7. 钱萍艳, 方向明, 丁国良, 等. 新双源CT低剂量Flash心脏扫描技术在低心率患者冠状动脉成像中的应用[J]. 南京医科大学学报:自然科学版, 2012, 32(6) :863-865.
8. Ghaye B, Szapiro D, Dacher JN, et al. Percutaneous ablation for atrial fibrillation:the role of cross-sectional imaging[J]. Radiographics, 2003, 23(Suppl 1) :S19-S33; discussion S48-S50.
9. Tsao HM, Yu WC, Cheng HC, et al. Pulmonary vein dilation in patients with atrial fibrillation:detection by magnetic resonance imaging[J]. J Cardiovasc Electrophysiol, 2001, 12(7) :809-813.
10. Kalra MK, Maher MM, Toth TL, et al. Strategies for CT radiation dose optimization[J]. Radiology, 2004, 230(3) :619-628.
11. World Health Organization. Technical Report Series, No. 894. Obesity:preventing and managing the global epidemic[R]. Geneva:World Health Organization, 2000.
12. 李烁, 王怡宁, 孔令燕, 等. 双源CT前瞻性心电触发螺旋扫描与序列扫描模式冠状动脉成像的比较[J]. 中国医学科学院学报, 2010, 32(6) :607-610, 后插3.
13. 佟海滨, 王小玲, 赵青, 等. 第二代双源CT前门控FLASH扫描与序列扫描冠状动脉成像比较[J]. 中国中西医结合影像学杂志, 2011, 9(5) :400-404.
14. 佟海滨, 赵青, 范洋洋, 等. 第二代双源CT前门控冠状动脉成像与冠状动脉造影比较的初步研究[J]. 中国中西医结合影像学杂志, 2012, 10(4) :301-304, 310, 封2.

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