Skip Navigation LinksHome > May/June 2012 - Volume 36 - Issue 3 > High-Definition Computed Tomography for Coronary Artery Sten...
Journal of Computer Assisted Tomography:
doi: 10.1097/RCT.0b013e318255aea0
Cardiothoracic Imaging

High-Definition Computed Tomography for Coronary Artery Stents Imaging Compared With Standard-Definition 64-Row Multidectector Computed Tomography: An Initial in Vivo Study

Yang, Wen Jie MD, PhD*; Zhang, Huan MD, PhD*; Xiao, Hua MD*; Li, Jian Ying PhD; Liu, Yan MD; Pan, Zi Lai MD*; Chen, Ke Min MD, PhD*

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Objective: The evaluation of coronary stents by computed tomography (CT) remains difficult. We assessed the imaging performance of a high-definition CT scanner (HDCT) by comparing with a conventional 64-row standard-definition CT (SDCT).

Methods: One hundred thirty-eight consecutive stented patients underwent coronary CT angiography, among whom 66 patients were examined by HDCT, and 72 patients by SDCT (LightSpeed VCT XT; GE Healthcare, Waukesha, Wis). The image quality score, the inner stent diameter (ISD), and the radiation dose were analyzed. All data were statistically tested by SPSS 13.0 software (SPSS Inc, Chicago, Ill).

Results: In 72 patients examined using SDCT, 135 stents were detected; in 66 patients examined using HDCT, 119 stents were detected. The image quality score on HDCT was significantly better than that on SDCT (1.4 [SD, 0.7] vs 1.9 [SD, 0.8]). The ISD on HDCT was significantly higher than that on SDCT (1.8 [SD, 0.5] vs 1.6 [SD, 0.4]). There was no significant difference of either image quality score or ISD between the HDCT and SDCT groups in stents with 2.5-mm diameter. Images on HDCT showed significantly better image quality score and larger ISD than images on SDCT in 2.75-, 3-, and 3.5-mm stents. For patients examined by retrospective electrocardiogram-gated technique, the radiation dose on HDCT was significantly lower than that on SDCT (11.3 [SD, 2.9] vs 15.1 [SD, 3.8] mSv).

Conclusions: High-definition CT scanner offered improved image quality and measurement accuracy for imaging coronary stents compared with conventional SDCT, providing higher spatial resolution and lower dose for evaluating coronary stents with 2.75- to 3.5-mm diameter.

© 2012 Lippincott Williams & Wilkins, Inc.



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