天津医药

天津医药 ›› 2015, Vol. 43 ›› Issue (4): 396-399.doi: 10.11958/j.issn.0253-9896.2015.04.017

• 诊断技术 • 上一篇    下一篇

高清和能谱扫描对冠状动脉支架成像准确性的体模研究

张文佳，张璋△，李东，于铁链   

  1. 天津医科大学总医院放射科（邮编300052）
  • 收稿日期:2014-11-24 修回日期:2015-01-20 出版日期:2015-04-15 发布日期:2015-04-13
  • 通讯作者: 张璋 E-mail:66000640@qq.com
  • 作者简介:张文佳（1989），女，硕士在读，主要从事心胸疾病CT诊断方面研究
  • 基金资助:
    国家临床重点专科建设项目；国家自然科学基金资助项目（项目编号：81301217）

Evaluation of coronary stent by gemstone spectral imaging or high-definition scan: a phantom study

ZHANG Wenjia，ZHANG Zhang△，LI Dong，YU Tielian   

  1. Department of Radiology, Tianjin Medical University General Hospital, Tianjin 300052, China
  • Received:2014-11-24 Revised:2015-01-20 Published:2015-04-15 Online:2015-04-13
  • Contact: ZHANG Zhang E-mail:66000640@qq.com

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摘要： 摘要：目的通过动态心脏和冠状动脉体模，评价高清扫描（HD）和能谱成像（GSI）对冠状动脉支架内径的显示能力。方法将5 支不同规格的冠状动脉支架置于心脏动态体模（心率设定为60 次/min）制成冠状动脉支架模型。分别进行HD、GSI 和标准（S）扫描3 种冠状动脉CT 造影（CCTA）扫描方式。数据传输至AW 工作站，分别对HD 图像、60～140 keV 的9 组单能量图像和S 图像进行后处理和指标测量，包括信噪比（SNR）、对比噪声比（CNR）、支架内径显示值和显示率。比较3 种扫描模式的差别和一致性。结果3 种扫描模式的SNR 值存在差别（P < 0.05），而 CNR 值的差别则无统计学意义（P > 0.05）。HD 的支架内径显示率（0.85±0.06）明显高于其他2 种扫描模式（GSI 为 0.40±0.16、0.48±0.13、0.50±0.14、0.51±0.13、0.45±0.05、0.52±0.13、0.53±0.13、0.53±0.13、0.53±0.13，S 为0.53±0.14，均 P < 0.05）。HD 扫描模式的内径最接近支架实际的内径。结论心率60 次/min 时，3 种扫描模式客观评价图像质量无明显差别；HD 模式对于支架的内径显示率明显高于GSI 和S 模式，其结果与支架实际内径之间具有更好的一致性。

关键词: 支架, CT 冠状动脉造影, 高清扫描, 能谱成像, 晕染效应, 线束硬化伪影

Abstract: Abstract：Objective To compare the displayed inner diameter of coronary stent by high definition（HD）and gem⁃ stone spectral imaging（GSI）using dynamic cardiac and coronary artery phantom. Methods Five different types of coro⁃ nary stents（internal diameter, 3.10 mm±0.55 mm; strut thickness, 0.12 mm±0.04 mm）were placed into a pulsating cardiac phantom（ALPHA 1-VT PC, Fuyo Corporation, Japan）. The stent phantom was scanned by 3 systems, gemstone spectral im⁃ aging（GSI）, spiral scan（S）and HD. All the spectral imaging data were analyzed using GSI viewer to reconstruct the VMS (monochromic spectral) images（60-140 keV）. Image noise（N）, signal-to-noise ratio（SNR）, contrast-to-noise ratio（CNR） and inner diameter were compared between images acquired through these 3 systems. Results SNRs in images of S and HD were higher than that of GSI（P < 0.05），while there were no significant differences in CNRs among images of GSI, S and HD（P > 0.05）. The visible diameter（%）measurements of HD（0.85±0.06）was significant higher than that of the other 2 scan systems and most close to the width of those stent’s actual size.（GSI:0.40±0.16, 0.48±0.13, 0.50±0.14, 0.51±0.13, 0.45±0.05,0.52±0.13, 0.53±0.13, 0.53±0.13, 0.53±0.13, S:0.53±0.14, P < 0.05）. Conclusion There was no significant dif⁃ ferences in image quality among the images acquired by these 3 systems when the heart rate was set to 60 beats per min. Comparing to GSI and S, HD can produce best represent images to the known inner diameter of coronary stent.

Key words: stents, coronary computed tomography angiography, HDCT, gemstone spectral imaging, blooming effect, beam-hardening