Department of Radiology, Division of Cardiovascular and Interventional Radiology, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria.
Eur Radiol. 2010 Sep;20(9):2084-91. doi: 10.1007/s00330-010-1792-9. Epub 2010 Apr 16.
To evaluate coronary stents in vitro using 128-slice-dual-source computed tomography (CT).
Twelve different coronary stents placed in a non-moving cardiac/chest phantom were examined by 128-slice dual-source CT using three CT protocols [high-pitch spiral (HPS), sequential (SEQ) and conventional spiral (SPIR)]. Artificial in-stent lumen narrowing (ALN), visible inner stent area (VIA), artificial in-stent lumen attenuation (ALA) in percent, image noise inside/outside the stent and CTDIvol were measured.
Mean ALN was 46% for HPS, 44% for SEQ and 47% for SPIR without significant difference. Mean VIA was similar with 31% for HPS, 30% for SEQ and 33% for SPIR. Mean ALA was, at 5% for HPS, significantly lower compared with -11% for SPIR (p = 0.024), but not different from SEQ with -1%. Mean image noise was significantly higher for HPS compared with SEQ and SPIR inside and outside the stent (p < 0.001). CTDIvol was lower for HPS (5.17 mGy), compared with SEQ (9.02 mGy) and SPIR (55.97 mGy), respectively.
The HPS mode of 128-slice dual-source CT yields fewer artefacts inside the stent lumen compared with SPIR and SEQ, but image noise is higher. ALN is still too high for routine stent evaluation in clinical practice. Radiation dose of the HPS mode is markedly (less than about tenfold) reduced.
使用 128 层双源 CT 对冠状动脉支架进行体外评估。
使用 128 层双源 CT 对放置在非移动心脏/胸部体模中的 12 种不同冠状动脉支架进行检查，采用 3 种 CT 方案[高心率螺旋（HPS）、序列（SEQ）和常规螺旋（SPIR）]。测量人工支架内管腔狭窄（ALN）、可见支架内面积（VIA）、支架内管腔衰减百分比（ALA）、支架内/外图像噪声和 CTDIvol。
HPS 的平均 ALN 为 46%，SEQ 为 44%，SPIR 为 47%，无显著差异。HPS 的平均 VIA 相似，为 31%，SEQ 为 30%，SPIR 为 33%。HPS 的平均 ALA 为 5%，明显低于 SPIR 的-11%（p = 0.024），但与 SEQ 的-1%无差异。支架内/外的平均图像噪声 HPS 明显高于 SEQ 和 SPIR（p < 0.001）。HPS 的 CTDIvol（5.17 mGy）低于 SEQ（9.02 mGy）和 SPIR（55.97 mGy）。
与 SPIR 和 SEQ 相比，128 层双源 CT 的 HPS 模式在支架管腔内产生的伪影更少，但图像噪声更高。ALN 仍然过高，不适合临床实践中的常规支架评估。HPS 模式的辐射剂量明显降低（约减少十倍）。
